JP7392089B2 - Imaging system, lens device, imaging device, control device - Google Patents

Description

The present invention relates to an imaging system, a lens device, an imaging device, and a control device .

Conventionally, a combination of image sensor image stabilization, which corrects image blur by shifting the image sensor, and intra-lens image stabilization, which corrects image blur by shifting some lens groups of the photographic optical system relative to the optical axis. An imaging device that performs hybrid image stabilization has been proposed.

Patent Document 1 discloses a camera system that expands the range of image stabilization for the camera system as a whole by appropriately setting the correction ratio of image sensor stabilization and intra-lens stabilization.

Patent No. 6410431

In a photographic optical system that employs a central projection method, the amount of image point movement that occurs during camera shake correction differs between the center and the periphery of an image. FIG. 16A shows the magnitude and direction of the image point movement at each image point on the subject image when image blur occurs in the -X direction at the center due to camera shake (rotational shake). FIG. 16(b) shows the magnitude and direction of the remaining amount of image blur correction at each image point on the subject image when the image blur generated in the center of FIG. 16(a) is corrected by image sensor image stabilization. ing. As shown in FIG. 16(a), the amount of image point movement at the periphery is larger than the amount of image point movement at the center. Therefore, as shown in FIG. 16(b), although the image blur has been corrected at the center, the influence of the image blur remains at the periphery, and the image point remains largely moved.

Patent Document 1 does not disclose a configuration for simultaneously correcting image shake that occurs in the center and the periphery of an image.

SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging system, a lens device, an imaging device, and a control device that can suppress the influence of image blur remaining in the periphery of an image.

An imaging system according to one aspect of the present invention includes an imaging device having a camera image stabilization section used for image stabilization, a camera control section that controls the camera image stabilization section, and a camera control section that controls the camera image stabilization section. An imaging system comprising: a lens device that is detachable and has a lens image stabilization section used for image stabilization; and a lens control section that controls the lens image stabilization section, the lens control section being , the lens image shake is reduced such that the image point movement in the first direction that occurs at the center of the imaging surface due to the shake applied to the imaging system is reduced, and the image point movement is caused in a second direction opposite to the first direction. The camera control unit controls the camera image blur correction unit so that movement of the image point in the second direction is reduced.

Further, a control method according to another aspect of the present invention includes an imaging device having a camera image stabilization unit used for image stabilization, and an imaging device that is removable from the imaging device, A method of controlling an imaging system comprising: a lens device having a lens image blur correction unit used in the imaging system; and controlling the lens image blur correction section so that the image point movement occurs in a second direction opposite to the first direction, and controlling the camera image blur correction section so that the image point movement in the second direction is reduced. It is characterized by

According to the present invention, it is possible to provide an imaging system, a lens device, an imaging device, and a control device that can suppress the influence of image blur that remains in the periphery of an image.

1 is a configuration diagram of a digital camera that is an example of a camera system according to an embodiment of the present invention. 7 is a flowchart showing image blur correction performed by the digital camera of Example 1. FIG. 7 is a flowchart showing lens-side priority drive control performed by the digital camera of Example 1. FIG. 3 is a flowchart showing camera-side priority drive control performed by the digital camera of the first embodiment. FIG. 3 is an explanatory diagram of an image blur correction operation performed by the digital camera of the first embodiment. 7 is a flowchart showing image blur correction performed by the digital camera of Example 2. FIG. 7 is a flowchart showing cooperative control performed by the digital camera of Example 2. FIG. FIG. 7 is an explanatory diagram of cooperative control according to the second embodiment. 12 is a flowchart showing image blur correction performed by the digital camera of Example 3. 12 is a flowchart showing image blur correction performed by the digital camera of Example 4. 12 is a flowchart showing image blur correction performed by the digital cameras of Examples 5 and 6. (a) shows the amount of movement of the image point of the subject due to image shake when the digital camera rotates by ω in the x direction, (b) shows the amount of movement of the image point of the subject image when the lens image blur correction section is driven, and (c ) indicates the amount of movement of the image point of the subject when the camera image blur correction section is driven. FIG. 7 is an explanatory diagram of the concept of Example 5. FIG. 7 is an explanatory diagram of the concept of Example 5. 12 is a flowchart showing image blur correction performed by the digital camera of Example 7. (a) is an explanatory diagram of the amount of image point movement at each image point on the subject image when image shake occurs in the -X direction at the center of the image, and (b) is an explanatory diagram of the amount of image point movement at each image point on the subject image when image shake occurs at the center of the image. FIG. 4 is an explanatory diagram of the remaining amount of image blur correction at each image point on the subject image when the image blur caused by image blur is corrected by image sensor image stabilization.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals are given to the same members, and duplicate explanations will be omitted.

FIG. 1A is a configuration diagram of a digital camera that is an example of a camera system (imaging system) according to an embodiment of the present invention. The digital camera is an interchangeable lens camera, and includes an interchangeable lens (lens device) 1 and a camera body (imaging device) 2. The interchangeable lens 1 is detachably and communicably attached to the camera body 2. The interchangeable lens 1 and the camera body 2 are electrically connected through electrical contacts 3, and communicate information and share power via the electrical contacts 3.

The interchangeable lens 1 includes a lens control section 104, a photographing optical system 101 including a plurality of optical elements including an image stabilization optical system 102, a lens storage section 103, a lens control section 104, a lens image stabilization control section 105, and a lens image stabilization control section 105. It includes a correction section 106 and an angular velocity sensor 107.

The camera body 2 includes a camera control section 201 , an image sensor 202 , a camera image blur correction control section 203 , a camera image blur correction section 204 , a camera storage section 205 , a camera calculation section 206 , and an image processing section 207 .

Light rays from an angle of view centered on the optical axis La of the photographic optical system 101 pass through the photographic optical system 101 and are formed on the image sensor 202 as a subject image. The subject image is photoelectrically converted in a photoelectric conversion unit (not shown) of the image sensor 202 and is transmitted to the image processing unit 207 as an electrical signal. The image processing unit 207 converts the electrical signal from the image sensor 202 into image data in an image file format through development processing, gamma processing, and the like. The image data is stored in a non-volatile memory (not shown) by the camera control unit 201.

The image sensor 202 can be moved by the camera image blur correction unit 204 in a direction including a component perpendicular to the optical axis La. The camera image blur correction section 204 includes a support section that supports the image sensor 202, and an actuator that moves the image sensor 202 in a direction including a component perpendicular to the optical axis La. The camera image blur correction control unit 203 performs camera-side image blur correction by controlling the camera image blur correction unit 204 under the control of the camera control unit 201.

The image blur correction optical system 102 is movable in a direction including a component perpendicular to the optical axis La by a lens image blur correction control section 105 and a lens image blur correction section 106. The lens image blur correction unit 106 includes a support portion that supports the image blur correction optical system 102, and an actuator that moves the image blur correction optical system 102 in a direction including a component perpendicular to the optical axis La. The lens image blur correction control unit 105 performs lens-side image blur correction by controlling the lens image blur correction unit 106 under the control of the lens control unit 104 .

The camera control unit 201 and the lens control unit 104 cooperate through communication via the electrical contacts 3, and use the camera image shake correction unit 204 and the lens image shake correction unit 106 to reduce unnecessary vibrations applied to the digital camera. Performs drive control for

In this embodiment, a case will be described in which the camera control unit 201 controls the lens image blur correction control unit 105 and the lens image blur correction unit 106 via the lens control unit 104 to control image blur correction for the entire digital camera. However, the present invention is not limited thereto. The lens control unit 104 may control the camera image blur correction control unit 203 and the camera image blur correction unit 204 via the camera control unit 201 to control image blur correction for the entire digital camera.

Further, the camera control unit 201 functions as a control device including an acquisition unit 201a and a control unit 201b, as shown in FIG. 1(b). The acquisition unit 201a acquires information regarding the remaining amount of image blur correction on the lens side and the camera side (the difference between the image point movement amount before correction and the image point movement amount after correction). The control unit 201b uses the information acquired by the acquisition unit 201a to determine the correction ratio (ratio of the amount of correction of the image point movement amount) of the two image blur correction units, and also determines the correction ratio of the two image blur correction units based on the correction ratio. At least one of the shake correction units is controlled. Note that the lens control unit 104 may function as a control device including an acquisition unit and a control unit. Further, the control device including the acquisition section and the control section may be configured as a separate device from the interchangeable lens 1 and the camera body 2.

The lens storage section 103 stores the current focal length of the interchangeable lens 1, the image stabilization angle that can be controlled by the lens image stabilization section 106, and the image stabilization angle that corresponds to the amount of movement of the image stabilization optical system 102, in other words. Information such as lens image blur correction sensitivity is stored. Further, the lens storage unit 103 stores information about the image blur correction angle corresponding to the amount of movement of the image sensor 202, that is, the camera image blur correction sensitivity. The lens storage unit 103 also stores information regarding the remaining amount of image shake correction at the periphery of the image (lens peripheral image shake (remaining correction information) is stored. Furthermore, the lens storage unit 103 stores information regarding the remaining amount of image shake correction at the periphery of the image when the camera image shake correction unit 204 corrects the image shake generated at the center of the image by a predetermined angle (camera peripheral image shake). (remaining correction information) is stored. The information stored in the lens storage unit 103 is referenced by the lens control unit 104 and camera control unit 201.

The camera control unit 201 outputs a command related to drive control of the camera image blur correction unit 204 to the camera image blur correction control unit 203 based on information stored in the lens storage unit 103. For example, the camera control unit 201 calculates an image stabilization angle that can be controlled by the camera image stabilization unit 204 based on information on camera image stabilization sensitivity, and also calculates the drive ratio (correction ratio) of the two image stabilization units. ) to determine. Further, for example, the camera control unit 201 switches the method of determining the drive ratio of the two image blur correction units based on the lens peripheral image blur correction remaining information and the camera peripheral image blur correction remaining information.

Note that the lens control unit 104 drives and controls various actuators via various control units (not shown) in accordance with instructions given from the camera body 2. For example, depending on the focus detection information and photometric information of the subject obtained by the image processing unit 207, the lens control unit 104 controls the focus adjustment means and aperture means (not shown) via a focus adjustment control unit (not shown) and an aperture control unit (not shown). It is possible to drive and control the subject image and adjust the aperture state.

Further, in this embodiment, a case will be described in which the camera image blur correction unit 204 performs camera-side image blur correction by driving the image sensor 202, but the present invention is not limited to this. The camera image blur correction unit 204 may perform camera-side image blur correction by changing the cutting position of the subject image formed on the image sensor 202.

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections.

Image shake correction in this embodiment includes the overall flow of image shake correction in FIG. (Second Drive Mode)" (FIG. 4). FIG. 2 is a flowchart showing image blur correction performed by the digital camera of this embodiment. FIG. 3 is a flowchart showing lens-side priority drive control performed by the digital camera of this embodiment. FIG. 4 is a flowchart showing camera-side priority drive control performed by the digital camera of this embodiment.

The entire flow of image blur correction shown in FIG. 2 is started when the digital camera is powered on or returned from a sleep state.

In step S001, the camera control unit 201 obtains the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd, which are stored in the lens storage unit 103 via the electrical contact 3 and the lens control unit 104. get.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The predetermined image height is an image height other than on the optical axis (off-axis image height). The remaining lens peripheral image blur correction amount Ld is the image point movement amount at the center of the image when the image blur correction optical system 102 is moved by a predetermined amount, the image point movement amount at a predetermined image height, and the image blur correction angle. It may be calculated from the information. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. (a function related to the remaining amount of lens peripheral image blur correction) may be used.

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd may be calculated from information about the image point movement amount that occurs at the center of the image when the digital camera is rotated by a predetermined amount and the image point movement amount at a predetermined image height. . The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. (a function related to the remaining amount of image blur correction around the camera).

In step S002, the camera control unit 201 determines whether the lens peripheral image blur correction remaining amount Ld is smaller than the camera peripheral image blur correction remaining amount Cd. If it is determined that the lens peripheral image blur correction remaining amount Ld is smaller than the camera peripheral image blur correction remaining amount Cd, the process proceeds to step S003, and if it is determined otherwise, the process proceeds to step S005. Note that when the lens peripheral image blur correction remaining amount Ld is equal to the camera peripheral image blur correction remaining amount Cd, which step to proceed to can be arbitrarily set.

In steps S003 and S005, the camera control unit 201 determines whether a shooting start instruction (referred to as SW) has been input. Specifically, the determination is made by detecting whether a release button provided on the digital camera has been pressed by the photographer. If it is determined in step S003 that the SW has been input, the process advances to step S004. If it is determined in step S005 that the SW has been input, the process advances to step S006. If it is determined in step S003 and step S005 that the SW is not input, the process returns to step S001, and the lens peripheral image blur correction remaining amount Ld and camera peripheral image blur correction remaining amount Cd are acquired again. This corresponds to the fact that the lens peripheral image blur correction remaining amount Ld and the camera peripheral image blur correction remaining amount Cd change when the photographer changes the focal length and focus state with the zoom lens. It's for a reason.

Note that in steps S003 and S005, it may be determined whether or not a shooting start instruction has been input by a method other than the press of the release button by the photographer. For example, it may be determined whether a shooting start instruction has been input from a remote control terminal wirelessly connected to the camera body 2. Alternatively, the camera body 2 may automatically detect the shooting conditions based on image information obtained by the image sensor 202 to determine whether a shooting start instruction has been input.

In step S004, the camera control unit 201 transmits an instruction to start lens-side priority control to the lens control unit 104, and starts lens-side priority control. Lens-side priority control is continuously performed until the exposure time ends.

In step S006, the camera control unit 201 transmits an instruction to start camera-side priority control to the lens control unit 104, and starts camera-side priority control. Camera-side priority control is continuously performed until the exposure time ends.

In this flow, one drive mode is selected between lens-side priority control and camera-side priority control based on the remaining amount of image blur correction around the lens Ld and the remaining amount of image blur correction around the camera Cd, and based on the selected mode, Image blur correction is performed. Note that the timing of the instruction from the camera control unit 201 to the lens control unit 104 as to which mode to perform image blur correction is not particularly limited. For example, immediately after determining which mode to set in step S002, instruction information may be transmitted based on the selection result. In this embodiment, the lens image blur correction control unit 105 and the lens image blur correction unit 106 also perform lens side priority control or camera side priority control based on the determination result by the camera control unit 201. In this specification, it is assumed that the camera control unit 201 controls the lens image blur correction control unit 105 and the lens image blur correction unit 106 even if the control is performed indirectly via the lens control unit 104. express.

When the exposure time ends in step S004 and step S006, the process advances to step S007. In step S007, the camera control unit 201 ends the photographing process.

In step S008, the camera control unit 201 determines whether the main switch of the digital camera is turned off. If it is determined that the main switch is turned off, this flow is ended, and if it is determined that the main switch is not turned off, the process returns to step S001. In addition to turning off the main switch, this flow may be terminated by determining that the camera body 2 has switched to a playback mode for playing back images taken on a display unit (not shown).

Lens-side priority drive control will be described below with reference to FIG. 3. As described above, the amount of image point movement that occurs during camera shake correction differs between the center and the periphery of the image. Therefore, in image blur correction, it is not possible to completely correct image blur occurring at the center and the periphery of an image at the same time. Further, the camera peripheral image blur correction remaining amount Cd and the lens peripheral image blur correction remaining amount Ld are different. When the lens periphery image blur correction remaining amount Ld is smaller than the camera periphery image blur correction remaining amount Cd, the lens side image blur correction reduces the image blur correction remaining at the periphery of the image more than the camera side image blur correction. I can do it.

In the subroutine shown in FIG. 3, image blur correction using the lens image blur correction unit 106 is used with priority over image blur correction using the camera image blur correction unit 204, so that the relative movement between the center and the peripheral areas is corrected. Even under conditions where the difference in amount is large, it is possible to reduce the residual image blur correction in the peripheral area. Specifically, in this subroutine, if the amount of shake applied to the digital camera is an amount that can be corrected without using the camera image shake correction unit 204, the lens image shake correction unit 106 does not use the camera image shake correction unit 204. to correct image blur. That is, image blur correction is performed with the drive ratio of the lens image blur correction unit 106 set to 1 and the drive ratio of the camera image blur correction unit 204 set to 0. In addition, if the amount of shake applied to the digital camera is large and the correction angle is insufficient without using the camera image shake correction unit 204, the camera image shake correction unit 204 corrects the image shake using the lens image shake correction unit 106. The missing image blur is corrected using .

The subroutine in FIG. 3 is executed by the camera control unit 201 and the lens control unit 104 under the control of the camera image blur correction control unit 203 and the lens image blur correction control unit 105. Upon receiving the instruction to start lens-side priority control, the lens control unit 104 sets the drive mode for image blur correction so that the lens image blur correction unit 106 performs image blur correction using lens-side priority control, and performs the image stabilization drive mode as shown in FIG. A subroutine is started. In this embodiment, at the start of the subroutine in FIG. 3, the image sensor 202 starts exposure for capturing a recorded image in response to the shooting start instruction input in step S003 in FIG.

In step S101, the lens image blur correction control section 105 drives and controls only the lens image blur correction section 106. The lens image shake correction control unit 105 calculates a correction amount based on the amount of shake applied to the digital camera, and drives the lens image shake correction unit 106 so that the image shake correction optical system 102 moves based on the calculated correction amount. Control. The amount of shake may be obtained based on the output of a sensor that physically measures the amount of momentum, such as the angular velocity sensor 107, may be obtained based on an image, or may be obtained based on both. good. For example, the shake angle is obtained by integrating the output of the angular velocity sensor 107 to remove noise etc. using a filter, and calculates the shake angle as the sensitivity (change in optical axis direction per unit movement of the image shake correction optical system 102). The amount of runout can be obtained by dividing the amount).

In step S102, the lens image stabilization control unit 105 determines whether the lens image stabilization unit 106 is attempting to drive the image stabilization optical system 102 beyond its control range (movement range), which is a so-called stroke out state. judge whether If it is determined that the lens image blur correction unit 106 is in a stroke-out state, the process advances to step S103, and if it is determined that this is not the case, the process advances to step S107.

In step S103, the lens image blur correction control unit 105 stops the lens image blur correction unit 106 at a position (control end) at which stroke out occurs. Furthermore, the camera image blur correction control unit 203 starts driving the camera image blur correction unit 204, which had been stopped at the reference position (referred to as the center). Such drive control is exchanged by communicating between the camera control unit 201 and the lens control unit 104 via the electrical contacts 3, and is executed using the camera image stabilization control unit 203 and the lens image stabilization control unit 105. be done. Specifically, from the position signal of the lens image shake correction unit 106 and the control state of the lens image shake correction control unit 105, the lens control unit 104 indicates that the position of the image shake correction optical system 102 has reached the end of the control range. and is transmitted to the camera control unit 201 via the electrical contact 3. Thereafter, the camera control unit 201 instructs the camera image blur correction control unit 203 to start driving the camera image blur correction unit 204. Note that the reference position is the position of the camera image stabilizer 204 when the image stabilization function is stopped or when the amount of shake is 0, and is generally the position of the camera image stabilizer 204 on the light receiving surface of the image sensor 202. , is the position where the optical axis is incident near the center of the range used for imaging (imaging area).

In step S104, the camera image blur correction control unit 203 determines whether the position of the camera image blur correction unit 204 that is being driven has returned to the center. If it is determined that it has returned to the center, the process advances to step S105, and if it is determined that it has not returned to the center, the process advances to step S106.

In step S105, the camera image blur correction control unit 203 performs positioning control of the camera image blur correction unit 204 so that the camera image blur correction unit 204 is positioned at the center again at the timing when the camera image blur correction unit 204 returns to the center.

In step S106, the camera control unit 201 determines whether the exposure time has elapsed. If it is determined that the exposure time has elapsed, this subroutine is ended; if it is determined otherwise, the process returns to step S104.

In step S107, the camera control unit 201 determines whether the exposure time has elapsed. If it is determined that the exposure time has elapsed, this subroutine is ended, and if it is determined otherwise, the process returns to step S101.

In this subroutine, image blur correction by the lens image blur correction unit 106 is performed until the lens image blur correction unit 106 strokes out. When the lens image shake correction section 106 strokes out, the camera image shake correction section 204 takes over and corrects the image shake that cannot be corrected by the lens shake correction section 106. Note that the lens side priority control is not limited to this. For example, in order to execute the handover more smoothly, driving of the camera image blur correction unit 204 may be started before the lens image blur correction unit 106 strokes out.

That is, in the lens-side priority control, when the amount of shake applied to the digital camera is less than or equal to a threshold value, the lens image shake correction unit 106 is controlled to be driven based on the amount of shake. On the other hand, when the amount of shake applied to the digital camera is larger than the threshold, the lens image shake correction unit 106 is controlled to be driven based on the amount of image shake corresponding to the threshold, and the camera image shake correction unit 204 is driven based on the amount of shake and the threshold. The driving is controlled based on the amount of image blur corresponding to the difference between the two images. For example, the camera control unit 201 drives and controls the camera image blur correction unit 204 based on the difference between the correction amount obtained based on the shake amount and the correction amount (stroke in the case of FIG. 3) corresponding to the threshold value. Thereby, the amount of movement of the image blur correction optical system 102 is suppressed to less than the image blur correction amount (less than the stroke) corresponding to the threshold value.

The camera side priority drive control will be described below with reference to FIG. 4. As described above, the amount of image point movement that occurs during camera shake correction differs between the center and the periphery of the image. Therefore, in image blur correction, it is not possible to completely correct image blur occurring at the center and the periphery of an image at the same time. Further, the camera peripheral image blur correction remaining amount Cd and the lens peripheral image blur correction remaining amount Ld are different. When the camera peripheral image shake correction remaining amount Cd is smaller than the lens peripheral image shake correction remaining amount Ld, the camera side image shake correction reduces the image shake correction residual at the periphery of the image more than the lens side image shake correction. I can do it.

In the subroutine shown in FIG. 4, image blur correction using the camera image blur correction unit 204 is used with priority over image blur correction using the lens image blur correction unit 106, so that the relative movement between the center and peripheral areas is corrected. Even under conditions where the difference in amount is large, it is possible to reduce the residual image blur correction in the peripheral area. Specifically, in this subroutine, if the amount of shake applied to the digital camera is an amount that can be corrected without using the lens image shake correction unit 106, the camera image shake correction unit 204 does not use the lens image shake correction unit 106. to correct image blur. That is, image blur correction is performed with the drive ratio of the lens image blur correction unit 106 set to 0 and the drive ratio of the camera image blur correction unit 204 set to 1. In addition, if the amount of shake applied to the digital camera is large and the correction angle is insufficient without using the lens image shake correction unit 106, the lens image shake correction unit 106 can correct the image shake using the camera image shake correction unit 204. The missing image blur is corrected using .

The subroutine in FIG. 4 is executed by the camera control unit 201 and the lens control unit 104 under the control of the camera image blur correction control unit 203 and the lens image blur correction control unit 105. When the camera control unit 201 transmits an instruction to start camera-side priority control, it sets the drive mode for image blur correction so that the camera image blur correction unit 204 performs image blur correction using camera-side priority control, and the image stabilization drive mode shown in FIG. A subroutine is started. In this embodiment, at the start of the subroutine of FIG. 4, the image sensor 202 starts exposure for capturing a recorded image in response to the shooting start instruction input in step S005 of FIG.

In step S201, the camera image blur correction control unit 203 drives and controls only the camera image blur correction unit 204. The camera image shake correction control unit 203 calculates a correction amount based on the amount of shake applied to the digital camera, and drives and controls the camera image shake correction unit 204 so that the image sensor 202 moves based on the calculated correction amount. The amount of shake may be obtained based on the output of a sensor that physically measures the amount of momentum, such as the angular velocity sensor 107, may be obtained based on an image, or may be obtained based on both. good. For example, the shake angle is obtained by integrating the output of the angular velocity sensor 107 to remove noise etc. using a filter, and calculates the shake angle as the sensitivity (change in optical axis direction per unit movement of the image shake correction optical system 102). The amount of runout can be obtained by dividing the amount).

In step S202, the camera image stabilization control unit 203 determines whether the camera image stabilization unit 204 is in a so-called stroke-out state, in which the camera image stabilization unit 204 attempts to drive the image sensor 202 beyond its control range (movable range). do. If it is determined that the camera image blur correction unit 204 is in a stroke-out state, the process advances to step S203, and if it is determined that this is not the case, the process advances to step S207.

In step S203, the camera image blur correction control unit 203 stops the camera image blur correction unit 204 at a position (control end) at which stroke out occurs. Further, the lens image blur correction control unit 105 starts driving the lens image blur correction unit 106, which had been stopped at the reference position (referred to as the center). Such drive control is exchanged by communicating between the camera control unit 201 and the lens control unit 104 via the electrical contacts 3, and is executed using the camera image stabilization control unit 203 and the lens image stabilization control unit 105. be done. Specifically, based on the position signal of the camera image shake correction unit 204 and the control state of the camera image shake correction control unit 203, the camera control unit 201 and the electrical contact detect that the position of the image sensor 202 has reached the end of the control range. 3 to the lens control unit 104. Thereafter, the lens control unit 104 instructs the lens image blur correction control unit 105 to start driving the lens image blur correction unit 106. Note that the reference position is the position of the lens image stabilization unit 106 when the image stabilization function is stopped or when the amount of shake is 0, and is generally the position of the lens image stabilization unit 106 on the light receiving surface of the image sensor 202. , is the position where the optical axis is incident near the center of the range used for imaging (imaging area).

In step S204, the lens image blur correction control unit 105 determines whether the position of the lens image blur correction unit 106 that is being driven has returned to the center. If it is determined that the object has returned to the center, the process proceeds to step S205, and if it is determined that it has not returned to the center, the process proceeds to step S206.

In step S205, the lens image blur correction control unit 105 performs positioning control of the lens image blur correction unit 106 so that the lens image blur correction unit 106 is positioned at the center again at the timing when the lens image blur correction unit 106 returns to the center.

In step S206, the camera control unit 201 determines whether the exposure time has elapsed. If it is determined that the exposure time has elapsed, this subroutine is ended; if it is determined otherwise, the process returns to step S204.

In step S207, the camera control unit 201 determines whether the exposure time has elapsed. If it is determined that the exposure time has elapsed, this subroutine is ended, and if it is determined otherwise, the process returns to step S201.

In this subroutine, image blur correction by the camera image blur correction unit 204 is performed until the camera image blur correction unit 204 strokes out. When the camera image blur correction section 204 strokes out, the lens image blur correction section 106 takes over and corrects the image blur that cannot be corrected by the camera image blur correction section 204. Note that the camera side priority control is not limited to this. For example, in order to execute the handover more smoothly, driving of the lens image blur correction unit 106 may be started before the camera image blur correction unit 204 strokes out.

That is, in the camera side priority control, when the amount of shake applied to the digital camera is less than or equal to the threshold value, the camera image shake correction unit 204 is controlled to be driven based on the amount of shake. On the other hand, when the amount of shake applied to the digital camera is larger than the threshold, the camera image shake correction unit 204 is controlled to be driven based on the amount of image shake corresponding to the threshold, and the lens image shake correction unit 106 is controlled based on the amount of shake and the threshold. The driving is controlled based on the amount of image blur corresponding to the difference between the two images. For example, the lens control unit 104 controls the lens image shake correction control unit 105 based on the difference between the correction amount obtained based on the shake amount and the correction amount (stroke in the case of FIG. 4) corresponding to the threshold value. Drive control of the lens image blur correction unit 106. Thereby, the amount of movement of the image sensor 202 is suppressed to less than the image blur correction amount (less than the stroke) corresponding to the threshold value.

FIG. 5 is an explanatory diagram of the image blur correction operation performed by the digital camera of this embodiment, and shows how the image blur correction section is driven in lens-side priority control and camera-side priority control. Here, the driving of the image stabilization unit refers to the drive by which the image stabilization unit moves the image sensor 202 or the image stabilization optical system 102, and in order to maintain each position at a predetermined position. Even if drive control is required, it does not include that drive.

In FIG. 5, the horizontal axis represents time, and the vertical axis represents the correction amount of the image blur correction unit in angle. It is assumed that the exposure start time is at the left end of the graph, and that exposure is performed continuously within the time axis of the graph. FIG. 5(a) shows how the image blur correction section is driven under lens-side priority control, and FIG. 5(b) shows how the image blur correction section is driven under camera-side priority control.

As shown in FIG. 5A, in the lens-side priority control, only the lens image blur correction unit 106 is driven at the initial stage of control (that is, immediately after the start of exposure) at the left end of the graph (step S101 in FIG. ). At time T1, it is detected that the lens image blur correction unit 106 has reached the control end (that is, stroke out) (corresponding to step S102 in FIG. 3). After time T1, the lens image blur correction unit 106 stops at the control end, and the camera image blur correction unit 204 starts driving (corresponding to step S103 in FIG. 3). At time T2, when the camera image blur correction unit 204 returns to the center, the camera image blur correction unit 204 is controlled to be located at the center (corresponding to steps S104 and S105 in FIG. 3). Further, at time T2, the drive is taken over by the lens image blur correction unit 106 (corresponding to the second step S101 in FIG. 3), and at time T3, only the lens image blur correction unit 106 is driven until the control end is reached. Continued. From time T3 to time T4, the lens image blur correction section 106 is stopped at the control end as from time T1 to time T2, and only the camera image blur correction section 204 is driven and controlled. In this way, in the lens-side priority control, the lens image blur correction section 106 and the camera image blur correction section 204 are driven alternately. By preferentially using the lens image blur correction unit 106, the difference in the remaining amount of image blur correction between the central part and the peripheral part of the image is reduced, and image blur in the entire image is reduced.

As shown in FIG. 5B, in camera-side priority control, only the lens image blur correction unit 204 is driven at the initial stage of control (that is, immediately after the start of exposure) at the left end of the graph (steps in FIG. 4). (equivalent to S201). At time T5, it is detected that the camera image blur correction unit 204 has reached the control end (that is, stroke out) (corresponding to step S202 in FIG. 4). After time T5, the camera image blur correction unit 204 stops at the control end, and the lens image blur correction unit 106 starts driving (corresponding to step S203 in FIG. 4). At time T6, when the lens image blur correction section 106 returns to the center, the lens image blur correction section 106 is controlled to be located at the center (corresponding to steps S204 and S205 in FIG. 4). Further, at time T6, the drive is taken over by the camera image shake correction unit 204 (corresponding to the second step S201 in FIG. 4), and at time T7, only the drive of the camera image shake correction unit 204 is continued until the control end is reached. Continued. From time T7 to time T8, the camera image blur correction section 204 stops at the control end, and only the lens image blur correction section 106 is driven and controlled, as from time T5 to time T6. In this way, in the camera-side priority control, the camera image blur correction section 204 and the lens image blur correction section 106 are driven alternately. By preferentially using the camera image blur correction unit 204, the difference in the remaining amount of image blur correction between the central part and the peripheral part of the image is reduced, and image blur in the entire image is reduced.

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections.

The image blur correction of this embodiment is comprised of the overall image blur correction flow shown in FIG. 6 and a subroutine (FIG. 7) called "cooperative control" in FIG. FIG. 6 is a flowchart showing image blur correction performed by the digital camera of this embodiment. FIG. 7 is a flowchart showing cooperative control performed by the digital camera of this embodiment.

The entire image blur correction flow shown in FIG. 6 is started when the digital camera is powered on or returned from a sleep state.

In step S301, the maximum shake amount (maximum shake amount) B detected in the preparation stage is acquired. The amount of shake may be obtained based on the output of a sensor that physically measures the amount of momentum, such as the angular velocity sensor 107, may be obtained based on an image, or may be obtained based on both. good. For example, the shake angle is obtained by integrating the output of the angular velocity sensor 107 to remove noise etc. using a filter, and calculates the shake angle as the sensitivity (change in optical axis direction per unit movement of the image shake correction optical system 102). The amount of runout can be obtained by dividing the amount).

In step S302, the camera control unit 201 calculates the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd, which are stored in the lens storage unit 103, via the electrical contact 3 and the lens control unit 104. get.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd may be calculated from information about the image point movement amount that occurs at the center of the image when the digital camera is rotated by a predetermined amount and the image point movement amount at a predetermined image height. . The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, in step S302, the camera control unit 201 obtains the maximum lens correction angle Lαmax and the maximum camera correction angle Cαmax stored in the lens storage unit 103 via the electrical contact 3 and the lens control unit 104. The lens maximum correction angle Lαmax is the image blur correction angle when the lens image blur correction unit 106 is driven by the maximum amount. Further, the camera maximum correction angle Cαmax is the image blur correction angle when the camera image blur correction unit 204 is driven by the maximum amount. Note that in this embodiment, the camera control unit 201 obtains the lens maximum correction angle Lαmax, but rather than the maximum correction angle, it obtains the maximum stroke of the image stabilization optical system 102 and the image stabilization optical system 102 that is driven by a unit amount. The image blur angle sensitivity, which is the correction angle for the case, may be obtained and calculated. Further, the camera control unit 201 acquires the camera maximum correction angle Lαmax, but it is not the maximum correction angle, but the maximum stroke of the image sensor 202 and the image shake angle sensitivity, which is the correction angle when the image sensor 202 is driven by a unit amount. You may also obtain the degree and calculate it.

In step S303, the camera control unit 201 determines whether the remaining lens peripheral image blur correction amount Ld is smaller than the camera peripheral image blur correction remaining amount Cd. If it is determined that the lens peripheral image blur correction remaining amount Ld is smaller than the camera peripheral image blur correction remaining amount Cd, the process advances to step S304, and if it is determined otherwise, the process advances to step S305. Note that when the lens peripheral image blur correction remaining amount Ld is equal to the camera peripheral image blur correction remaining amount Cd, which step to proceed to can be arbitrarily set.

In step S304, the camera control unit 201 determines whether the maximum angle B of shake acquired in step S301 is less than or equal to the lens maximum correction angle Lαmax (threshold value). This determines whether image shake correction using only the lens image shake correction unit 106 is possible for the maximum shake amount B. That is, when the maximum shake amount B is less than or equal to the lens maximum correction angle Lαmax, image shake correction using only the lens image shake correction unit 106 is possible. On the other hand, when the maximum shake amount B is larger than the lens maximum correction angle Lαmax, if image shake is corrected using only the lens image shake correction unit 106, the lens side image shake correction unit 106 will stroke out and the image shake will be completely corrected. cannot be corrected. If it is determined that the maximum shake amount B is smaller than the lens maximum correction angle Lαmax, the process advances to step S304, and if it is determined otherwise, the process advances to step S306.

In step S305, the camera control unit 201 determines whether the maximum shake angle B acquired in step S301 is less than or equal to the camera maximum correction angle Cαmax (threshold). This determines whether image shake correction using only the camera image shake correction unit 204 is possible for the maximum shake amount B. That is, when the maximum shake amount B is less than or equal to the camera maximum correction angle Cαmax, image shake correction using only the camera image shake correction unit 204 is possible. On the other hand, if the maximum shake amount B is larger than the camera maximum correction angle Cαmax, if image shake is corrected using only the camera image shake correction unit 204, the camera-side image shake correction unit 204 will stroke out and the image shake will be reduced. It cannot be completely corrected. If it is determined that the maximum shake amount B is smaller than the lens maximum correction angle Lαmax, the process advances to step S308, and if it is determined otherwise, the process advances to step S307.

In steps S306, S307, and S308, the camera control unit 201 determines whether a shooting start instruction (referred to as SW) has been input. Specifically, the determination is made by detecting whether a release button provided on the digital camera has been pressed by the photographer. If it is determined in step S306 that the SW has been input, the process advances to step S309. If it is determined in step S307 that the SW has been input, the process advances to step S310. If it is determined in step S308 that the SW has been input, the process advances to step S311. If it is determined in step S306, step S307, and step S308 that the SW is not input, the process returns to step S301 and the maximum shake amount B is acquired again. After that, in step S302, the lens peripheral image blur correction remaining amount Ld and the camera peripheral image blur correction remaining amount Cd are acquired again. This corresponds to the fact that the lens peripheral image blur correction remaining amount Ld and the camera peripheral image blur correction remaining amount Cd change when the photographer changes the focal length and focus state with the zoom lens. It's for a reason.

Note that in steps S306, S307, and S308, it may be determined whether or not a shooting start instruction has been input by a method other than pressing the release button by the photographer. For example, it may be determined whether a shooting start instruction has been input from a remote control terminal wirelessly connected to the camera body 2. Alternatively, the camera body 2 may automatically detect the shooting conditions based on image information obtained by the image sensor 202 to determine whether a shooting start instruction has been input.

In step S309, the camera control unit 201 transmits an instruction to start the lens-side priority control described above to the lens control unit 104, and starts the lens-side priority control. Lens-side priority control is continuously performed until the exposure time ends.

In step S310, the camera control unit 201 transmits an instruction to start cooperative control to the lens control unit 104 and camera image blur correction control unit 203, and starts cooperative control. Cooperative control is continuously performed until the exposure time ends.

In step S311, the camera control unit 201 transmits an instruction to start the camera-side priority control described above to the lens control unit 104, and starts the camera-side priority control. Camera-side priority control is continuously performed until the exposure time ends.

In this flow, lens-side priority control, camera-side priority control, and cooperative control are performed based on the remaining amount of image blur correction around the lens Ld, the remaining amount of image blur correction around the camera Cd, the lens maximum correction angle Lαmax, and the camera maximum correction angle Cαmax. One of the drive modes is selected. Then, image blur correction is performed based on the selected mode. Note that the timing of the instruction from the camera control unit 201 to the lens control unit 104 as to which mode image shake correction is to be performed is not particularly limited. For example, immediately after determining which mode to set in step S304 or step S305, instruction information may be transmitted based on the selection result. In this embodiment, the lens image blur correction control unit 105 and the lens image blur correction unit 106 also perform lens-side priority control, camera-side priority control, or cooperative control based on the determination result by the camera control unit 201. In this specification, it is assumed that the camera control unit 201 controls the lens image blur correction control unit 105 and the lens image blur correction unit 106 even if the control is performed indirectly via the lens control unit 104. express.

When the exposure time ends in steps S309, S310, and S311, the process advances to step S312. In step S312, the camera control unit 201 ends the photographing process.

In step S313, the camera control unit 201 determines whether the main switch of the digital camera is turned off. If it is determined that the main switch is turned off, this flow is ended, and if it is determined that the main switch is not turned off, the process returns to step S301. In addition to turning off the main switch, this flow may be terminated by determining that the camera body 2 has switched to a playback mode for playing back images taken on a display unit (not shown).

The cooperative control will be described below with reference to FIG. 7. In the subroutine of FIG. 7, the lens image blur correction unit 106 and the camera image blur correction unit 204 are used when there is a possibility that the amount of shake applied to the digital camera exceeds the lens maximum correction angle Lαmax or the camera maximum correction angle Cαmax. Image blur correction is performed.

After it is determined that the lens-side image blur correction unit 106 has stroked out, the interchangeable lens 1 notifies the camera body 2 of this fact through communication. After that, when controlling the drive of the camera-side image blur correction section 204, there may be a delay in driving the camera-side image blur correction section 204. Furthermore, it is necessary for the camera body 2 and the interchangeable lens 1 to communicate during the exposure period. Communication between the camera body 2 and the interchangeable lens 1 takes more time than communication between each block inside the camera body 2 and the interchangeable lens 1, so the accuracy of image stabilization decreases due to communication delay. There is a possibility.

Therefore, in the subroutine of FIG. 7, the drive ratio, which is the sharing ratio of shake correction between the lens-side image shake correction unit 106 and the camera-side image shake correction unit 204, is determined, and image shake correction is performed using each drive ratio. , to reduce the impact of delays associated with these communications.

The subroutine in FIG. 7 is executed by the camera control unit 201 and the lens control unit 104 under the control of the camera image blur correction control unit 203 and the lens image blur correction control unit 105. When the lens control unit 104 receives the instruction to start cooperative control, it sets the image stabilization drive mode so that the lens image stabilization unit 106 performs image stabilization by cooperative control, and the subroutine of FIG. 7 is started. Ru.

In step S401, the camera control unit 201 determines the drive ratio based on the lens maximum correction angle Lαmax and the camera maximum correction angle Cαmax.

In step S402, image blur correction control is started based on the drive ratio determined in step S401. For example, a case will be described in which the lens-side drive ratio determined in step S401 is 0.4, the camera-side drive ratio is 0.6, and the digital camera rotates by an angle θ. In this case, the lens image blur correction unit 106 is set to correct the angle 0.4·θ, and the camera image blur correction unit 204 is set to correct the angle 0.6·θ. For example, the lens image shake correction control unit 105 obtains a lens-side image shake correction amount and a camera-side image shake correction amount based on the amount of shake applied to the digital camera and the drive ratio, and calculates the camera-side image shake correction amount from the camera body. Drive control may be performed by transmitting the signal to the second side. In addition, if the amount of shake can be acquired by each of the interchangeable lens 1 and the camera body 2, the image shake correction control unit of each can correct the image shake based on the drive ratio acquired in step S401 and the amount of shake acquired by each. A correction amount may also be obtained. In this case, since the camera body 2 and the interchangeable lens 1 each acquire their respective image blur correction amounts, once the drive ratio is transmitted to the interchangeable lens 1, each can perform image blur correction. Therefore, it is more preferable because it is less susceptible to communication delays and can reduce the amount of communication. The drive control started in this step is continued until the exposure is completed.

In step S403, exposure is started.

In step S404, exposure ends.

Cooperative control makes it possible to make maximum use of the strokes of each image blur correction section.

FIG. 8 is an explanatory diagram of cooperative control, showing how each image blur correction section is driven. Here, the driving of the image stabilization unit refers to the drive by which the image stabilization unit moves the image sensor 202 or the image stabilization optical system 102, and in order to maintain each position at a predetermined position. Even if drive control is required, it does not include that drive.

In FIG. 8, the horizontal axis represents time, and the vertical axis represents the correction amount of the image blur correction unit in angle. It is assumed that the exposure start time is at the left end of the graph, and that exposure is performed continuously within the time axis of the graph.

In FIG. 8, cooperative control is performed based on the drive ratio determined in step S401 in FIG. That is, during the exposure period shown in the graph, the image blur correction units are driven and controlled at a predetermined ratio with waveforms that are similar to each other.

By switching between the lens-side priority control, camera-side priority control, and cooperative control described using FIGS. 6 to 8, it becomes possible to realize an appropriate image blur correction operation in the photographing optical system 101.

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections. FIG. 9 is a flowchart showing image blur correction performed by the digital camera of this embodiment. The flow shown in FIG. 9 is started when the digital camera is powered on or returned from a sleep state.

In step S501, the camera control unit 201 calculates the remaining lens peripheral image blur correction amount Ld and camera peripheral image blur correction remaining amount Cd, which are stored in the lens storage unit 103, via the electrical contact 3 and the lens control unit 104. get.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

In step S502, the camera control unit 201 determines whether a shooting start instruction (referred to as SW) has been input. Specifically, the determination is made by detecting whether a release button provided on the digital camera has been pressed by the photographer. If it is determined that the SW has been input, the process advances to step S503, and if it is determined that the SW has not been input, the process returns to step S501.

In step S503, the camera control unit 201 determines the drive ratio based on the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd.

In step S504, image blur correction control is started based on the drive ratio determined in step S503. For example, a case will be described in which the lens-side drive ratio determined in step S503 is 0.4, the camera-side drive ratio is 0.6, and the digital camera rotates by an angle θ. In this case, the lens image blur correction unit 106 is set to correct the angle 0.4·θ, and the camera image blur correction unit 204 is set to correct the angle 0.6·θ.

In step S505, exposure is started.

In step S506, exposure ends.

In step S507, the camera control unit 201 ends the photographing process.

In step S508, the camera control unit 201 determines whether the main switch of the digital camera is turned off. If it is determined that the main switch is turned off, this flow is ended, and if it is determined that the main switch is not turned off, the process returns to step S501. In addition to turning off the main switch, this flow may be terminated by determining that the camera body 2 has switched to a playback mode for playing back images taken on a display unit (not shown).

The method for determining the drive ratio in step S503 of this embodiment will be described below. In step S503, the drive ratio is determined based on the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd. When the drive ratio on the camera side is CIS and the drive ratio on the lens side is LIS, the drive ratios CIS and LIS are determined using the following equations (1) and (2), respectively.

As shown in equations (1) and (2), in this embodiment, the drive ratio is determined so that the image blur correction section with the smaller remaining amount of peripheral image blur correction is driven more.

For example, when the image blur when the digital camera rotates by 1° is corrected by the lens image blur correction unit 106 so that the center of the image stops, the remaining peripheral image blur correction amount is 0.01 mm (=Ld). Furthermore, when the image shake when the digital camera rotates by 1° is corrected by the camera image shake correction unit 204 so that the center of the image stops, the remaining peripheral image shake correction amount is 0.03 mm (=Cd). In this case, when the digital camera rotates by an angle θ, the lens image stabilization unit 106 corrects the angle 0.75·θ, and the camera-side image blur correction unit 204 corrects the angle 0.25·θ. is set to As a result, image blur correction can be performed while reducing the peripheral image blur correction remaining amount.

Further, for example, when the image shake when the digital camera rotates 1° is corrected by the lens image shake correction unit 106 so that the center of the image stops, the remaining amount of peripheral image shake correction is 0.01 mm (=Ld). do. Furthermore, when the camera image shake correction unit 204 corrects the image shake when the digital camera rotates 1° so that the center of the image stops, the remaining amount of peripheral image shake correction is -0.03 mm (=Cd). . In this example, when the digital camera rotates by a predetermined angle, the amount of peripheral image blur correction remaining when the image blur at the center of the image is corrected by the lens image blur correction unit 106 and when it is corrected by the camera image blur correction unit 204 is shown. has the opposite sign. In this case, when the digital camera rotates by an angle θ, the lens image stabilization unit 106 corrects the angle 0.75·θ, and the camera-side image blur correction unit 204 corrects the angle 0.25·θ. is set to As a result, it is possible to set the remaining amount of peripheral image blur correction to 0, and it is possible to reduce the remaining amount of image blur correction for the entire image.

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections. FIG. 10 is a flowchart showing image blur correction performed by the digital camera of this embodiment. The flow shown in FIG. 10 is started when the digital camera is powered on or returned from a sleep state.

In step S601, the camera control unit 201 calculates the remaining lens peripheral image blur correction amount Ld and camera peripheral image blur correction remaining amount Cd, which are stored in the lens storage unit 103, via the electrical contact 3 and the lens control unit 104. get.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

In step S602, the camera control unit 201 determines whether a shooting start instruction (referred to as SW) has been input. Specifically, the determination is made by detecting whether a release button provided on the digital camera has been pressed by the photographer. If it is determined that the SW has been input, the process advances to step S603, and if it is determined that the SW has not been input, the process returns to step S601.

In step S603, the camera control unit 201 determines whether the absolute value of the difference between the lens peripheral shake amount Ld and the camera peripheral shake amount Cd is smaller than a predetermined amount β. If the absolute value of the difference is smaller than the predetermined amount β, the process advances to step S604. In this case, since there is almost no difference in the remaining amount of image blur correction in the peripheral area between image blur correction by the lens image blur correction unit 106 and image blur correction by the camera side image blur correction unit 204, which image blur correction should be performed. There is no difference in the amount of image blur correction remaining in the peripheral areas. In step S604, the camera control unit 201 determines which image blur correction unit to use. Specifically, the drive ratio of one image blur correction section is determined to be 1, and the drive ratio of the other image blur correction section is determined to be 0.

On the other hand, in step S603, if the absolute value of the difference is larger than the predetermined amount β, the process advances to step S605. In step S605, the camera control unit 201 determines the drive ratio based on the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd, similar to step S503 in FIG.

Note that in step S603, if the absolute value of the difference is equal to the predetermined amount β, which step to proceed to can be arbitrarily set.

In step S606, image blur correction control is started based on the drive ratio determined in step S604 or step S605. For example, if the drive ratio on the lens side is 0.4 and the drive ratio on the camera side is 0.6, and the digital camera rotates by an angle θ, the lens image blur correction unit 106 corrects the angle 0.4·θ. The camera image blur correction unit 204 is set to correct the angle 0.6·θ.

In step S607, exposure is started.

In step S608, exposure ends.

In step S609, the camera control unit 201 ends the photographing process.

In step S610, the camera control unit 201 determines whether the main switch of the digital camera is turned off. If it is determined that the main switch is turned off, this flow is ended, and if it is determined that the main switch is not turned off, the process returns to step S501. In addition to turning off the main switch, this flow may be terminated by determining that the camera body 2 has switched to a playback mode for playing back images taken on a display unit (not shown).

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections. FIG. 11 is a flowchart showing image blur correction performed by the digital camera of this embodiment. The flow shown in FIG. 11 is started when the digital camera is powered on or returned from a sleep state.

In step S701, the camera control unit 201 calculates the remaining lens peripheral image blur correction amount Ld and camera peripheral image blur correction remaining amount Cd, which are stored in the lens storage unit 103, via the electrical contact 3 and the lens control unit 104. get. The camera control unit 201 also obtains the lens image blur correction sensitivity Lv and the camera image blur correction sensitivity Cv.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the lens image blur correction sensitivity Lv is the image blur correction angle when the image blur correction optical system 102 is driven by a predetermined amount.

Further, the camera image blur correction sensitivity Cv is the image blur correction angle when the image sensor 202 is driven by a predetermined amount.

In step S702, the camera control unit 201 determines whether a shooting start instruction (referred to as SW) has been input. Specifically, the determination is made by detecting whether a release button provided on the digital camera has been pressed by the photographer. If it is determined that the SW has been input, the process advances to step S703, and if it is determined that the SW has not been input, the process returns to step S701.

In step S703, the camera control unit 201 determines the lens drive coefficient Lk and the camera drive coefficient Ck based on the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd. The lens drive coefficient Lk is used when determining the angle to be corrected by the lens image blur correction unit 106. Further, the camera drive coefficient Ck is used when determining the angle to be corrected by the camera image blur correction unit 204. The lens drive coefficient Lk and camera drive coefficient Ck are determined using the following equations (3) and (4), respectively.

In step S704, image blur correction control is started using the lens drive coefficient Lk and camera drive coefficient Ck determined in step S703.

When the digital camera rotates by an angle θ, the angle Lθ corrected by the lens image stabilization unit 106 and the angle Cθ corrected by the camera image stabilization unit 204 are calculated using the following equations (5) and (6), respectively. It is determined.

Furthermore, the drive amount Lt of the lens image blur correction section 106 and the drive amount Ct of the camera image blur correction section 204 are determined using the following equations (7) and (8), respectively.

When the digital camera rotates by an angle θ, the lens image stabilization unit 106 and the camera image stabilization unit 204 are controlled by the driving amount Lt of the lens image stabilization unit 106 and the driving amount Ct of the camera image stabilization unit 204. . The drive control started in this step is continued until the exposure is completed.

In step S705, exposure is started.

In step S706, exposure ends.

In step S707, the camera control unit 201 ends the photographing process.

In step S708, the camera control unit 201 determines whether the main switch of the digital camera is turned off. If it is determined that the main switch has been turned off, this flow is ended, and if it is determined that the main switch has not been turned off, the process returns to step S701. In addition to turning off the main switch, this flow may be terminated by determining that the camera body 2 has switched to a playback mode for playing back images taken on a display unit (not shown).

In this embodiment, the drive amount Lt of the lens image blur correction section 106 and the drive amount Ct of the camera image blur correction section 204 are determined so that the remaining peripheral image blur correction amount is reduced.

For example, when the image blur when the digital camera rotates by 1° is corrected by the lens image blur correction unit 106 so that the center of the image stops, the remaining peripheral image blur correction amount is 0.01 mm (=Ld). Furthermore, when the image shake when the digital camera rotates by 1° is corrected by the camera image shake correction unit 204 so that the center of the image stops, the remaining peripheral image shake correction amount is 0.03 mm (=Cd). At this time, when the digital camera rotates by 0.5°, the lens image blur correction unit 106 is driven to correct image blur of 0.75° (=Lθ). Further, the camera image blur correction unit 204 is driven to correct image blur of −0.25° (=Cθ).

Image stabilization is performed by determining the drive ratio so that the image stabilization unit of the drive system with a small amount of peripheral shake is driven more, and by driving the image stabilization unit of the drive system with a large amount of peripheral shake in the opposite direction. It is possible to cancel the amount of peripheral runout while performing this. As a result, when performing image blur correction, it is possible to perform image blur correction without peripheral blur.

The concept of image blur correction will be explained below.

Figures 12(a) to 12(c) show the amount of movement of the image point of the subject due to image shake when the digital camera rotates by ω in the x direction, and the image of the subject when the lens image shake correction unit is driven. The amount of point movement indicates the amount of movement of the image point of the subject when the camera image blur correction unit is driven.

As shown in FIG. 12A, in a photographing optical system that employs a central projection method, the amount of image point movement that occurs when image blur occurs differs between the center and the periphery. When the focal length of the photographing optical system is f, the image height from the center in the rotational shake direction is y, and the amount of rotational shake is ω, the image point movement amount Δy at the image height y is expressed by the following equation (9). expressed.

In addition, as shown in FIG. 12(b), when the lens image stabilization unit is driven, decentering distortion occurs by decentering some lenses in the photographic optical system, and the image points at the center and periphery are The amount of movement is different.

In addition, as shown in FIG. 12(c), when the camera image stabilization unit is driven, image points at the center and the periphery are The amount of movement is almost the same. However, the amount of movement of the image point between the center and the periphery may differ due to the influence of lens distortion.

Next, the concept of the embodiment will be explained with reference to FIG.

Similar to FIG. 12(a), FIG. 13(a) shows the amount of movement of the image point of the subject due to image shake when the digital camera rotates by ω in the x direction, and the image point moves between the center and the periphery. It shows that the amount is different.

In FIG. 13(b), the lens image blur correction section is driven to correct the image blur that occurred in FIG. 13(a). As shown in FIG. 12(b), the amount of image point movement at the center and the periphery is different even in the image point correction of the lens image blur correction unit, but the ratio of the amount of image point movement at the center and the periphery is different from that of the digital camera. The ratio of the amount of image point movement between the center and the periphery due to image shake that occurs when the image is rotated is different. Therefore, it is impossible to completely reduce both the image blur in the center and the periphery to zero by correcting the image blur only by the lens image blur correction section. Therefore, in FIG. 13(b), the image blur correction is performed by driving the lens image blur correction unit so that the amount of image point movement in the center and the periphery is equal. The amount of movement of the image point at the center in FIG. 13(b) is in the opposite direction to the amount of movement of the image point at the center that occurred in FIG. 13(a). That is, in FIG. 13(b), driving is performed to overcorrect compared to the case where image blur is corrected only by the lens image blur correction section.

In FIG. 13(c), the camera image blur correction unit corrects the image blur that was overcorrected in FIG. 13(b). As shown in FIG. 12(c), when the camera image blur correction section is driven, the image point movement amounts at the center and the periphery are almost the same. Therefore, the image blur caused by the rotation of the digital camera is corrected by the lens image stabilization unit so that the amount of image point movement in the center and periphery is equal (Fig. 13(b)), and the remaining image blur is corrected in the camera image. The shake correction unit performs the correction (FIG. 13(c)). This makes it possible to correct image blur at the center as well as image blur at the periphery.

In the concept explained with reference to FIG. 13, when the camera image blur correction section is driven, the image point movement amount at the center and the periphery is the same. If the amount of image point movement at the center and the periphery do not match, when the camera image stabilization section is driven, the amount of drive of the lens image stabilization section is adjusted according to the ratio of the amount of image point movement at the center and periphery. Just optimize it. This makes it possible to correct the final image blur in the center as well as the image blur in the periphery.

Next, the concept of the embodiment will be explained with reference to FIG.

Similar to FIG. 12(a), FIG. 14(a) shows the amount of movement of the image point of the subject due to image shake when the digital camera rotates by ω in the x direction, and the image point moves between the center and the periphery. It shows that the amount is different.

In FIG. 14(b), the lens image blur correction section is driven to correct the image blur that occurred in FIG. 14(a). As shown in FIG. 12(b), the amount of image point movement at the center and the periphery is different even in the image point correction of the lens image blur correction unit, but the ratio of the amount of image point movement at the center and the periphery is different from that of the digital camera. The ratio of the amount of image point movement between the center and the periphery due to image shake that occurs when the image is rotated is different. Therefore, it is impossible to completely reduce both the image blur in the center and the periphery to zero by correcting the image blur only by the lens image blur correction section. Therefore, in FIG. 14(b), the image blur correction is performed by driving the lens image blur correction section so that the amount of image point movement in the center and the periphery is equal. The image point movement amount at the center in FIG. 14(b) remains an image blur correction amount in the same direction as the image point movement amount at the center that occurred in FIG. 14(a). In other words, in FIG. 14(b), the driving is performed with insufficient correction compared to the case where image blur is corrected only by the lens image blur correction section.

In FIG. 14(c), the camera image blur correction unit corrects the image blur that was insufficiently corrected in FIG. 14(b). As shown in FIG. 12(c), when the camera image blur correction section is driven, the image point movement amounts at the center and the periphery are almost the same. Therefore, the image blur caused by the rotation of the digital camera is corrected by the lens image blur correction unit so that the amount of image point movement in the center and periphery is equal (Fig. 14(b)), and the remaining image blur is corrected in the camera image. The shake correction unit performs the correction (FIG. 14(c)). This makes it possible to correct image blur at the center as well as image blur at the periphery.

In the concept explained with reference to FIG. 14, when the camera image blur correction section is driven, the image point movement amounts in the center and the periphery are the same. If the amount of image point movement at the center and the periphery do not match, when the camera image stabilization section is driven, the amount of drive of the lens image stabilization section is adjusted according to the ratio of the amount of image point movement at the center and periphery. Just optimize it. This makes it possible to correct the final image blur in the center as well as the image blur in the periphery.

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections. FIG. 11 is a flowchart showing image blur correction performed by the digital camera of this embodiment. The flow shown in FIG. 11 is started when the digital camera is powered on or returned from a sleep state.

In step S701, the camera control unit 201 calculates the remaining lens peripheral image blur correction amount Ld and camera peripheral image blur correction remaining amount Cd, which are stored in the lens storage unit 103, via the electrical contact 3 and the lens control unit 104. get. The camera control unit 201 also obtains the lens image blur correction sensitivity Lv and the camera image blur correction sensitivity Cv.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the lens image blur correction sensitivity Lv is the image blur correction angle when the image blur correction optical system 102 is driven by a predetermined amount.

Further, the camera image blur correction sensitivity Cv is the image blur correction angle when the image sensor 202 is driven by a predetermined amount.

In step S702, the camera control unit 201 determines whether a shooting start instruction (referred to as SW) has been input. Specifically, the determination is made by detecting whether a release button provided on the digital camera has been pressed by the photographer. If it is determined that the SW has been input, the process advances to step S703, and if it is determined that the SW has not been input, the process returns to step S701.

In step S703, the camera control unit 201 determines the lens drive coefficient Lk and the camera drive coefficient Ck based on the remaining lens peripheral image blur correction amount Ld and the camera peripheral image blur correction remaining amount Cd. The lens drive coefficient Lk is used when determining the angle to be corrected by the lens image blur correction unit 106. Further, the camera drive coefficient Ck is used when determining the angle to be corrected by the camera image blur correction unit 204. The lens drive coefficient Lk and camera drive coefficient Ck are determined using equations (3) and (4), respectively.

In step S704, image blur correction control is started using the lens drive coefficient Lk and camera drive coefficient Ck determined in step S703.

Even if the remaining amount of image blur correction at a predetermined image height is not zero, it can be tolerated as long as it is less than or equal to the allowable peripheral image blur remaining amount t. Therefore, when the digital camera rotates by an angle θ, the angle Lθ corrected by the lens image stabilization unit 106 and the angle Cθ corrected by the camera image stabilization unit 204 are calculated using the following equations (10) and (11), respectively. determined using

Furthermore, the drive amount Lt of the lens image blur correction section 106 and the drive amount Ct of the camera image blur correction section 204 are determined using equations (7) and (8), respectively.

When the digital camera rotates by an angle θ, the lens image stabilization unit 106 and the camera image stabilization unit 204 are controlled by the driving amount Lt of the lens image stabilization unit 106 and the driving amount Ct of the camera image stabilization unit 204. . The drive control started in this step is continued until the exposure is completed.

In step S705, exposure is started.

In step S706, exposure ends.

In step S707, the camera control unit 201 ends the photographing process.

In step S708, the camera control unit 201 determines whether the main switch of the digital camera is turned off. If it is determined that the main switch has been turned off, this flow is ended, and if it is determined that the main switch has not been turned off, the process returns to step S701. In addition to turning off the main switch, this flow may be terminated by determining that the camera body 2 has switched to a playback mode for playing back images taken on a display unit (not shown).

In this embodiment, the drive amount Lt of the lens image blur correction section 106 and the drive amount Ct of the camera image blur correction section 204 are determined so that the remaining peripheral image blur correction amount is reduced.

Image stabilization is performed by determining the drive ratio so that the image stabilization unit of the drive system with a small amount of peripheral shake is driven more, and by driving the image stabilization unit of the drive system with a large amount of peripheral shake in the opposite direction. It is possible to cancel the amount of peripheral runout while performing this. As a result, when performing image blur correction, it is possible to perform image blur correction without peripheral blur.

Image stabilization performed by the digital camera of this embodiment is performed by the camera control unit 201 and the lens control unit 104 based on information stored in the lens storage unit 103 while communicating with each other via the electrical contacts 3. This determines the driving amount of the two image blur correction sections. FIG. 15 is a flowchart showing image blur correction performed by the digital camera of this embodiment. The flow shown in FIG. 15 is started when the digital camera is powered on or returned from a sleep state.

In step S801, the lens control unit 104 stores the remaining lens peripheral image blur correction amount Ld, the camera peripheral image blur correction remaining amount Cd, the lens image blur correction sensitivity Lv, and the camera image blur correction amount stored in the lens storage unit 103. Obtain the corrected sensitivity Cv.

As described above, the lens peripheral image blur correction remaining amount Ld is the remaining amount of image blur correction in the peripheral part of the image when the lens image blur correction unit 106 corrects the image blur generated in the center of the image by a predetermined angle. is the remaining amount of image blur correction at a predetermined image height. The remaining lens peripheral image blur correction amount Ld is a function that indicates how the value of the lens peripheral image blur correction remaining amount changes for each image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the camera peripheral image blur correction remaining amount Cd is the remaining amount of image blur correction in the peripheral part of the image when the camera image blur correction unit 204 corrects the image blur occurring in the center of the image by a predetermined angle, This is the remaining amount of image blur correction at a predetermined image height. The camera peripheral image blur correction remaining amount Cd is a function that indicates how the value of the camera peripheral image blur correction remaining amount changes depending on the image height when the image blur occurring at the center of the image is corrected by a predetermined angle. It may be a coefficient of

Further, the lens image blur correction sensitivity Lv is the image blur correction angle when the image blur correction optical system 102 is driven by a predetermined amount.

Further, the camera image blur correction sensitivity Cv is the image blur correction angle when the image sensor 202 is driven by a predetermined amount.

In step S802, the lens control unit 104 determines the lens drive coefficient Lk and the camera drive coefficient Ck based on the lens peripheral image blur correction remaining amount Ld and the camera peripheral image blur correction remaining amount Cd. The lens drive coefficient Lk is used when determining the angle to be corrected by the lens image blur correction unit 106. Further, the camera drive coefficient Ck is used when determining the angle to be corrected by the camera image blur correction unit 204. The lens drive coefficient Lk and camera drive coefficient Ck are determined using equations (3) and (4), respectively.

In step S803, the lens control unit 104 notifies the camera body 2 (camera control unit 201) of the camera drive coefficient Ck determined in step S802.

In step S804, the camera control unit 201 obtains the camera drive coefficient Ck determined in step S802.

In step S805, the camera control unit 201 drives the camera image blur correction unit 204 using the camera drive coefficient Ck.

When the digital camera rotates by an angle θ, the angle Cθ corrected by the camera image blur correction unit 204 is determined using equation (6).

Further, the driving amount Ct of the camera image blur correction unit 204 is determined using equation (8).

In step S806, the lens control unit 104 drives the lens image blur correction unit 106 using the lens drive coefficient Lk determined in step S802.

When the digital camera rotates by an angle θ, the angle Lθ corrected by the lens image blur correction unit 106 is determined using equation (5).

Further, the driving amount Lt of the lens image blur correction unit 106 is determined using equation (7).

When the digital camera rotates by an angle θ, the lens image stabilization unit 106 and the camera image stabilization unit 204 are controlled by the driving amount Lt of the lens image stabilization unit 106 and the driving amount Ct of the camera image stabilization unit 204. .

In step S807, it is determined whether to end image blur correction. If it is determined that image blur correction is to be completed, this flow is terminated, and if it is determined otherwise, the process advances to step S808.

In step S808, it is determined whether the lens state has been changed. The lens state refers to the zoom state and focus state of the lens.
If it is determined that the lens state has been changed, the process advances to step S801, and if it is determined otherwise, the process advances to step S806.
[Other Examples]
The present invention provides a system or device with a program that implements one or more of the functions of the above-described embodiments via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. This can also be achieved by processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The disclosure of this embodiment includes the following configurations .
(Configuration 1)
an imaging device including a camera image blur correction section used for image blur correction; and a camera control section that controls the camera image blur correction section;
An imaging system comprising: a lens device that is detachable from the imaging device and includes a lens image stabilization section used for image stabilization, and a lens control section that controls the lens image stabilization section. There it is,
The lens control unit is configured to reduce image point movement in a first direction that occurs at the center of the imaging surface due to shake applied to the imaging system, and to reduce image point movement in a second direction opposite to the first direction. controlling the lens image stabilization unit so as to cause
The imaging system is characterized in that the camera control unit controls the camera image blur correction unit so that movement of the image point in the second direction is reduced.
(Configuration 2)
The lens control unit controls the lens image blur correction unit so that the image point movement in the first direction that occurs at the center of the imaging surface due to shake applied to the imaging system is canceled. The imaging system according to configuration 1.
(Configuration 3)
According to configuration 1 or 2, the amount of movement of the image point at the center of the imaging surface caused by shake applied to the imaging system is different from the amount of movement of the image point at an off-axis image height of the imaging surface. imaging system.
(Configuration 4)
The imaging system according to configuration 3, wherein the lens control unit controls the lens image blur correction unit so that a difference in image point movement amount between the center portion and the off-axis image height is reduced. .
(Configuration 5)
The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
5. The imaging system according to any one of configurations 1 to 4, wherein the camera image blur correction unit performs image blur correction by driving an image sensor included in the imaging device.
(Configuration 6)
The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
Imaging according to any one of configurations 1 to 4, wherein the camera image shake correction unit performs image shake correction by changing an image cutting position in an image sensor included in the image pickup device. system.
(Configuration 7)
The lens device used in a camera system including an imaging device having a camera image blur correction unit used for image blur correction, and a lens device detachable from the imaging device,
It has a lens image blur correction section used for image blur correction, and a lens control section that controls the lens image blur correction section,
The lens control unit is configured to reduce image point movement in a first direction that occurs at the center of the imaging surface due to shake applied to the imaging system, and to reduce image point movement in a second direction opposite to the first direction. controlling the lens image stabilization unit so as to cause
A lens device, wherein the image point movement in the second direction is reduced by image blur correction by the camera image blur correction section.
(Configuration 8)
The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
8. The lens device according to configuration 7, wherein the camera image blur correction unit performs image blur correction by driving an image sensor included in the imaging device.
(Configuration 9)
The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
8. The lens device according to configuration 7, wherein the camera image blur correction unit performs image blur correction by changing an image cutting position in an image sensor included in the imaging device.
(Configuration 10)
The imaging device used in a camera system having an imaging device and a lens device that is detachable from the imaging device,
It has a camera image blur correction unit used for image blur correction, and a camera control unit that controls the camera image blur correction unit,
The lens is configured to cancel image point movement in a first direction that occurs at the center of the imaging surface due to shake applied to the imaging system, and to cause image point movement in a second direction opposite to the first direction. Image stabilization is performed in the device,
The image pickup device is characterized in that the camera control unit controls the camera image blur correction unit so that movement of the image point in the second direction is reduced.
(Configuration 11)
In the lens device, image blur correction is performed by driving an optical element included in the lens device,
11. The imaging device according to configuration 10, wherein the camera image blur correction unit performs image blur correction by driving an image sensor included in the imaging device.
(Configuration 12)
In the lens device, image blur correction is performed by driving an optical element included in the lens device,
11. The imaging device according to configuration 10, wherein the camera image blur correction unit performs image blur correction by changing an image cutting position in an image sensor included in the imaging device.
(Configuration 13)
A control device that controls an imaging system including a first device that is one of an imaging device and a lens device attached to the imaging device, and a second device that is the other,
First information regarding the first image blur correction remaining amount of the off-axis image height according to the correction by the first image blur correction unit provided in the first device; and the second information provided in the second device. an acquisition unit that acquires second information regarding a second image blur correction remaining amount of the off-axis image height according to the correction by the image blur correction unit;
Using the first information and the second information, determine the correction ratio between the first image blur correction section and the second image blur correction section, and determine the correction ratio between the first image blur correction section and the second image blur correction section based on the correction percentage. A control device comprising: a control unit that controls at least one of the image blur correction unit and the second image blur correction unit.
(Configuration 14)
The control according to configuration 13, wherein the control unit controls the first image blur correction unit when the first image blur correction remaining amount is smaller than the second image blur correction remaining amount. Device.
(Configuration 15)
The control unit includes:
When the first image blur correction remaining amount is smaller than the second image blur correction remaining amount and the amount of shake applied to the first device is less than or equal to the threshold value, the first image blur correction section Control based on the amount of runout,
When the first image blur correction remaining amount is smaller than the second image blur correction remaining amount and the shake amount is larger than the threshold value, the first image blur correction section and the second image blur correction section 15. The control device according to configuration 13 or 14, wherein the control device controls the amount of vibration based on the amount of runout.
(Configuration 16)
The control unit is configured to correct an image shake amount corresponding to the threshold value when the first remaining image shake correction amount is smaller than the second image shake correction remaining amount and the shake amount is larger than the threshold value. the first image blur correction unit to control the second image blur correction unit to correct an image blur amount corresponding to a difference between the image blur amount and the image blur amount corresponding to the threshold value; 16. The control device according to configuration 15.
(Configuration 17)
When the first image blur correction remaining amount is smaller than the second image blur correction remaining amount and the shake amount is larger than the threshold value, the control unit controls the first image blur correction portion and the second image blur correction portion. 16. The control device according to configuration 15, wherein the image blur correction unit determines the correction ratio so as to correct an image blur amount smaller than an image blur amount corresponding to the threshold value.
(Configuration 18)
The first image blur correction remaining amount is the remaining amount of image blur correction at an off-axis image height when the first image blur correction unit corrects the image blur generated at the center of the image,
The second image blur correction remaining amount is a remaining amount of image blur correction at an off-axis image height when the second image blur correction unit corrects the image blur generated at the center portion. The control device according to any one of configurations 13 to 17.
(Configuration 19)
19. The control device according to any one of configurations 13 to 18, wherein the first information includes the first image blur correction remaining amount for each of a plurality of off-axis image heights.
(Configuration 20)
20. The control device according to any one of configurations 13 to 19, wherein the second information includes the second image blur correction remaining amount for each of a plurality of off-axis image heights.
(Configuration 21)
19. The control device according to any one of configurations 13 to 18, wherein the first information is a coefficient of a function related to the first image blur correction remaining amount.
(Configuration 22)
20. The control device according to any one of configurations 13 to 19, wherein the second information is a coefficient of a function related to the second image blur correction remaining amount.
(Configuration 23)
The control unit is configured such that the first remaining image blur correction amount and the second remaining image blur correction amount have the same sign, and the first remaining image blur correction amount is smaller than the second remaining image blur correction amount. In this case, the first image blur correction section is driven in a direction for correcting image blur, and the second image blur correction section is driven in a direction opposite to the direction for correcting image blur. 23. The control device according to any one of the configurations described in 22.
(Configuration 24)
The control unit controls at least one of the first image blur correction unit and the second image blur correction unit so that the remaining amount of image blur correction in the image is smaller than a predetermined amount. 24. The control device according to any one of configurations 13 to 23.
(Configuration 25)
The control section controls the first image stabilization section so that the difference between the remaining amount of image stabilization at the center of the image and the remaining amount of image stabilization at the off-axis image height becomes small; A control device according to any one of configurations 13 to 24, characterized in that the second image blur correction unit is controlled to correct the remaining amount of image blur correction according to the correction by the first image blur correction unit. .
(Configuration 26)
The control section controls the first image stabilization section so that the remaining amount of image stabilization at the center of the image is equal to the remaining amount of image stabilization at the off-axis image height, and controls the first image stabilization section. 27. A control device according to any one of configurations 13 to 26, characterized in that the second image blur correction section is controlled to correct a remaining amount of image blur correction in accordance with the correction by the image blur correction section.
(Configuration 27)
The direction of the image blur generated at the center and the off-axis image height and the direction of the remaining amount of image blur correction at the center and the off-axis image height according to the correction by the first image blur correction unit are opposite to each other. 27. The control device according to configuration 25 or 26, wherein the control device is a direction.
(Configuration 28)
The direction of the image blur generated at the center and the off-axis image height and the direction of the remaining amount of image blur correction at the center and the off-axis image height according to the correction by the first image blur correction unit are the same direction. 27. The control device according to configuration 25 or 26, characterized in that:
(Configuration 29)
optical system and
A lens device comprising: the control device according to any one of configurations 13 to 28.
(Configuration 30)
An image sensor and
An imaging device comprising: the control device according to any one of configurations 13 to 28.
(Configuration 31)
The control device according to any one of configurations 13 to 28,
the lens device including the first image blur correction section;
An imaging system comprising: the imaging device including the second image blur correction section.
(Configuration 32)
The first image blur correction section drives an optical element in the lens device to correct image blur,
32. The imaging system according to configuration 31, wherein the second image blur correction unit performs image blur correction by driving an image sensor in the imaging device.
(Configuration 33)
The first image blur correction section drives an optical element in the lens device to correct image blur,
32. The imaging system according to configuration 31, wherein the second image blur correction unit performs image blur correction by changing a position at which an image is cut out by an image sensor in the imaging device.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the invention.

1 Interchangeable lens (lens device)
2 Camera body (imaging device)
104 Lens control unit (control device)
201 Camera control unit (control device)
201a Acquisition unit 201b Control unit

Claims (13)

an imaging device including a camera image blur correction section used for image blur correction; and a camera control section that controls the camera image blur correction section;
An imaging system comprising: a lens device that is detachable from the imaging device and includes a lens image stabilization section used for image stabilization, and a lens control section that controls the lens image stabilization section. There it is,
The lens control unit is configured to reduce image point movement in a first direction that occurs at the center of the imaging surface due to shake applied to the imaging system, and to reduce image point movement in a second direction opposite to the first direction. controlling the lens image stabilization unit so as to cause
The imaging system is characterized in that the camera control unit controls the camera image blur correction unit so that movement of the image point in the second direction is reduced. The lens control unit controls the lens image blur correction unit so that the image point movement in the first direction that occurs at the center of the imaging surface due to shake applied to the imaging system is canceled. The imaging system according to claim 1. 2. The image pickup system according to claim 1, wherein the amount of image point movement at the center of the imaging surface caused by shake applied to the imaging system is different from the amount of image point movement at an off-axis image height of the imaging surface. Imaging system. The imaging according to claim 3, wherein the lens control unit controls the lens image blur correction unit so that a difference in image point movement amount between the center portion and the off-axis image height is reduced. system. The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
The imaging system according to claim 1, wherein the camera image blur correction unit performs image blur correction by driving an image sensor included in the imaging device. The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
2. The imaging system according to claim 1, wherein the camera image blur correction unit performs image blur correction by changing an image cutting position in an image sensor included in the imaging device. An imaging device having a camera image stabilization section used for image stabilization, and a lens device detachably attached to the imaging device and having a lens image stabilization section used for image stabilization. A method of controlling an imaging system comprising:
The lens is configured such that image point movement in a first direction that occurs at the center of the imaging surface due to shake applied to the imaging system is reduced, and image point movement occurs in a second direction opposite to the first direction. Controls the image stabilization section,
A control method, comprising controlling the camera image blur correction unit so that the movement of the image point in the second direction is reduced. 8. The lens image blur correction unit is controlled so that the image point movement in the first direction that occurs at the center of the imaging surface due to shake applied to the imaging system is canceled. control method. 8. The image pickup system according to claim 7, wherein an amount of movement of the image point at the center of the imaging surface caused by shake applied to the imaging system is different from an amount of movement of the image point at an off-axis image height of the imaging surface. Control method. 10. The control method according to claim 9, further comprising controlling the lens image blur correction unit so that a difference in image point movement amount between the center portion and the off-axis image height is reduced. The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
8. The control method according to claim 7, wherein the camera image blur correction unit performs image blur correction by driving an image sensor included in the imaging device. The lens image blur correction unit performs image blur correction by driving an optical element included in the lens device,
8. The control method according to claim 7, wherein the camera image blur correction unit performs image blur correction by changing an image cutting position in an image sensor included in the imaging device. A program for causing a computer to execute the control method according to any one of claims 7 to 12.