JP2018180323A - Image blur correction device, imaging apparatus, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image blur correction device capable of effectively assisting panning by highly accurately determining the repetitive motion of a subject.SOLUTION: There is provided an imaging apparatus for correcting the blur of the image of the subject by image blur correction means. The imaging apparatus calculates the movement amount of the subject from a shake detection signal detected by shake detection means and the captured image. When the inversion of the code of the movement amount of the subject is detected, the imaging apparatus switches the execution of first control for controlling the image blur correction means on the basis of the shake detection signal and the execution of second control for controlling the image blur correction means on the basis of the movement amount of the subject, according to the amplitude of the movement amount of the subject in a predetermined period.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image shake correction apparatus mounted on a camera or the like and a control method thereof, and more particularly to a photographing assistance technique for performing a follow shot.

  Panning with a camera is a method of shooting at a shutter speed slower than normal while moving the camera according to the movement of a moving subject. According to the panning, an image in which the background flows and the subject is stationary can be obtained. A photographer can shoot a full-speed photograph by panning. However, since long-second shooting is performed, it is difficult to match the speed of the subject with the speed of shaking the camera during the exposure period.

  Patent Document 1 discloses an imaging device that detects a difference between the speed of an object and the speed of shaking a camera, and corrects a deviation amount corresponding to the difference using a shake correction function. The imaging apparatus detects an angular velocity with respect to the panning of the camera moving according to the movement of the subject using an angular velocity sensor immediately before shooting. The imaging device also detects a motion vector corresponding to the amount of movement of the main subject image on the imaging surface. The imaging device calculates the angular velocity of the main subject from the detected panning angular velocity and the motion vector of the main subject image. Then, during the exposure, the imaging device performs the image blur correction operation according to the difference amount between the calculated angular velocity of the main subject and the angular velocity sensor output. As a result, it is possible to correct an image blur related to the main subject and assist (assist) the follow shot.

JP, 2006-317848, A

  However, in the imaging device disclosed in Patent Document 1, correction during exposure is performed using the angular velocity of the main subject calculated before exposure, so the movement of the subject at the time of detection is different from the movement of the subject at the time of correction Will correct in the wrong direction. For example, a person running is doing repetitive movements up and down with each step other than the moving direction. With regard to the subject performing such repetitive motion, depending on the calculation timing of the angular velocity of the main subject, the motion of the image blur correction unit is in the opposite direction to the direction to be actually corrected, and the amount of image blur increases.

  By detecting the inversion of the sign of the signal of the object angular velocity, the repetitive movement of the object is determined, and when it is determined that the object is repetitively moving, normal anti-vibration control may be performed. Normal image stabilization control is to perform image shake correction (camera shake correction control) based on an angular velocity sensor output. However, the sign of the signal of the object angular velocity may be easily inverted due to a vector detection error, an erroneous determination, an offset of the angular velocity sensor, or the like. In this case, if it shifts to normal anti-vibration control, it will not be possible to assist the follow shot effectively. An object of the present invention is to provide an image stabilization apparatus capable of effectively assisting a follow shot by accurately determining repetitive motion of a subject.

  An image shake correction apparatus according to an embodiment of the present invention is an image shake correction apparatus that corrects a shake of an image of a subject captured by an imaging unit through an imaging optical system by an image shake correction unit, and is detected by a shake detection unit. Calculating means for calculating the amount of movement of the subject from the detected shake signal and the captured image, and control means for controlling the image shake correction means based on the detection signal of the shake or the output of the calculation means Prepare. The control means controls the image shake correction means on the basis of the detection signal of the shake in accordance with the amplitude of the output of the calculation means in a predetermined period when reverse of the sign of the output of the calculation means is detected. Switching between the execution of the first control to be performed and the execution of the second control for controlling the image blur correction unit based on the output of the calculation unit.

  According to the image shake correction apparatus of the present invention, it is possible to accurately determine the repetitive movement of the subject and to effectively assist the follow shot.

It is a figure showing an example of composition of an imaging device. 6 is a flowchart illustrating an example of calculation processing of a main subject angular velocity. It is a figure which shows the example of the change of to-be-photographed object angular velocity of the vertical direction. It is a figure explaining the operation | movement in a follow shot mode. It is a flow chart explaining operation processing of main subject angular velocity. It is a figure explaining the relationship between main subject angular velocity and angular acceleration.

Example 1
FIG. 1 is a view showing an example of the arrangement of an image pickup apparatus provided with the image shake correction apparatus of this embodiment.
The image shake correction apparatus of the present embodiment can also be mounted on an imaging apparatus such as a video camera, a digital camera, and a silver halide still camera, or an optical apparatus such as an interchangeable lens for a digital single-lens reflex camera. The imaging apparatus shown in FIG. 1 is, for example, a mirrorless camera (hereinafter simply referred to as “camera”) equipped with a follow shot mode function.

  The interchangeable lens 100 having an image blur correction function is an optical device that can be attached to the camera body 120. The interchangeable lens 100 includes an imaging lens unit 101 having an imaging optical system 102, a zoom lens group 103, and a shift lens group 104. The zoom lens group 103 can change the focal length of the imaging optical system 102.

  The zoom encoder 105 detects the position of the zoom lens 103 and outputs a detection signal to a lens system control microcomputer (hereinafter referred to as “lens control unit”) 113. The lens control unit 113 obtains the focal length of the imaging optical system 102 based on the detection signal of the zoom encoder 105. In addition, the shift lens group 104 moves in a direction perpendicular to the optical axis to optically correct a blur (image blur) of an image caused by a shake applied to the camera by changing an imaging position of light from the subject. Correction lens (shift lens). Hereinafter, the shift lens group will also be described simply as a "shift lens". That is, the image shake correction apparatus according to the present embodiment corrects the shake of the image of the subject captured by the imaging unit (image sensor 122) through the imaging optical system using the shift lens.

  An angular velocity sensor (hereinafter referred to as a gyro) 111 functioning as a shake detection unit detects shake of the entire camera and outputs a shake detection signal to the amplifier 112. The shake detection signal indicates the angular velocity of the camera. The amplifier 112 amplifies the shake detection signal and outputs the amplified shake detection signal to the lens control unit 113. The lens control unit 113 takes in the output of the amplifier 112 as gyro data by an analog / digital converter (A / D) or the like. Further, the lens control unit 113 includes a camera shake correction control unit 117 that performs camera shake correction control, and a follow shot mode control unit 118 that performs control for a follow shot mode. The lens control unit 113 also performs focus lens control, aperture control, and the like, but is omitted for simplification of the drawing. The driver 114 drives the shift lens group 104 in order to correct the image blur in accordance with the control signal from the lens control unit 113. That is, the driver 114, together with the shift lens group 104 and its drive mechanism, constitutes an image shake correction unit. The amplifier 115 amplifies positional information of the shift lens group 104 detected and output by the position sensor 106 and outputs the amplified information to the lens control unit 113. Although the detection of the position of the shift lens group 104 and the correction of the image blur are performed with respect to two orthogonal axes such as the horizontal direction and the longitudinal direction, the detection of the position and the correction of the image blur are performed with the same configuration for two axes Therefore, only one axis will be described below. The interchangeable lens 100 further includes a mount contact unit 116 used for communication with the camera body unit 120.

  The camera body 120 includes an image sensor 122 such as a shutter 121 used for exposure control and a CMOS (complementary metal oxide semiconductor) sensor. An imaging signal output from the imaging element 122 is processed by an analog signal processing circuit (AFE) 123 and then sent to a camera signal processing circuit 124. The timing generator (TG) 125 sets operation timings of the imaging element 122 and the analog signal processing circuit 123. The operation unit 131 includes a power switch, a release switch, a switch for switching whether or not to set to the follow shot mode, and a switch for selecting the flow amount of the background in the following mode.

  A camera system control microcomputer (hereinafter referred to as “camera control unit”) 132 controls the entire imaging apparatus. For example, the camera control unit 132 outputs a control signal to the shutter driver 133 to drive and control the shutter drive motor 134. However, FIG. 1 shows only the part related to the follow shot in the camera control unit for the simplification of the description.

  The memory card 171 is a recording medium for recording data of a photographed image. The display unit 172 includes a display device such as a liquid crystal panel (LCD) that monitors an image that a photographer intends to shoot with a camera and displays the photographed image. The camera body 120 includes a mount contact portion 161 used for communication with the interchangeable lens 100. The lens control unit 113 and the camera control unit 132 perform serial communication at predetermined timing via the mount contact units 116 and 161.

  The camera signal processing circuit 124 includes a motion vector detection unit 141. The motion vector detection unit 141 detects the movement of a captured image based on image data of a plurality of frames. The motion vector detection unit 141 outputs a detection signal of the motion of the captured image to the camera control unit 132.

  The camera control unit 132 includes a histogram creation unit 150, a main subject determination unit 151, and a main subject angular velocity calculation unit 152. The histogram creation unit 150 creates a histogram of the amount of motion based on the detection signal of the motion of the captured image output by the motion vector detection unit 141. Based on the created histogram and the angular velocity of the camera received from the lens control unit 113, the main subject determination unit 151 selects an area on the screen where the main subject to be shot and shot. The main subject angular velocity calculation unit 152 converts motion vector information on the main subject selected by the main subject determination unit 151 into angular velocity using a focal length, a frame rate, a pixel pitch of a sensor, and the like. Then, the main subject angular velocity calculation unit 152 calculates the main subject angular velocity based on the angular velocity obtained by converting the motion vector information regarding the main subject and the angular velocity of the camera. The main subject angular velocity is a panning angular velocity of the camera for stopping the subject which is a follow shot object, and corresponds to the amount of movement of the subject. That is, the motion vector detection unit 141 and the camera control unit 132 function as a calculation unit that calculates the amount of movement of the subject from the shake detection signal (angular velocity of the camera) detected by the angular velocity sensor 111 and the captured image.

  When the photographer turns on the power of the camera using the operation unit 131, the camera control unit 132 detects that the power is turned on. The camera control unit 132 executes power supply to each circuit of the camera body unit 120 and initialization processing. Power supply to the interchangeable lens 100 is performed, and the lens control unit 113 executes an initial setting process in the interchangeable lens 100. Then, communication starts between the lens control unit 113 and the camera control unit 132 at a predetermined timing. By communication between the lens and the camera, the state of the camera, shooting settings, and the like are transmitted and received from the camera body 120 to the interchangeable lens 100. In addition, focal length information of the interchangeable lens, angular velocity information, and the like are transmitted and received from the interchangeable lens 100 to the camera body 120 at necessary timing. Furthermore, in the follow shot mode, information indicating that the follow shot mode is in progress and data of the main subject angular velocity calculated by the subject angular velocity calculation unit 152 are transmitted from the camera body 120 to the interchangeable lens 100 . When the lens control unit 113 receives information indicating that the follow shot mode is in progress, the drive control of the shift lens is switched to the control by the follow shot control unit 118. The follow shot control unit 118 drives the shift lens group 104 based on the main subject angular velocity to correct an image blur related to the main subject and assist the follow shot. If the follow shot mode is not in effect, the lens control unit 113 switches the shift lens drive control to control by the shake correction control unit 117 (shake correction control). Then, the camera shake correction control unit 117 executes normal image stabilization control based on the angular velocity of the camera.

  FIG. 4 is a diagram for explaining the operations of the lens control unit and the camera control unit in the follow shot mode. S401 to S407 show the operation in the lens control unit 113, and S411 to S416 show the operation in the camera control unit 132.

  The lens control unit 113 samples the output of the angular velocity sensor (gyro) 111 at 4 kHz, for example. In step S <b> 401, the lens control unit 113 transmits, to the camera control unit 132, an average value of gyro data in a period synchronized with an inter-frame in which vector detection is performed on the camera side. In S411, the camera control unit 132 receives gyro data (broken line 421).

  In step S412, the camera control unit 132 calculates the main subject angular velocity based on the gyro data received in step S411 and the main subject vector selected by the subject determination unit 151. In step S413, the camera control unit 132 transmits the calculation result to the lens control unit 113, as indicated by the broken line 422. In S402, the lens control unit 113 receives the main subject angular velocity from the camera control unit 132.

  Next, in S414, based on the main subject angular velocity calculated in S412 by the camera control unit 132 and the focal length (not shown) transmitted from the lens control unit 113 to the camera control unit 132 at another timing, An exposure time for obtaining a predetermined flow rate is calculated. Subsequently, in S415, the camera control unit 132 determines whether SW2 is turned on (whether the release operation has been performed). If the SW2 is not turned on, the process returns to S411. When the switch SW2 is turned on, the camera control unit 132 transmits, to the lens control unit 113, information indicating that the switch SW2 is turned on and the exposure time calculated in step S414 (broken line 423).

  In S403, the lens control unit 113 determines whether SW2 is turned on. If the SW2 is not turned on, the process returns to S401. If the SW2 is turned on, the process proceeds to S404. As a result, both the lens control unit 113 and the camera control unit 132 transition to an operation during exposure.

  In step S416, the camera control unit 132 starts an exposure operation. In step S417, the camera control unit 132 determines whether the exposure end timing has come. If the exposure end timing has not come, the process returns to S417. On the other hand, in S404, the lens control unit 113 subtracts the current gyro data from the main object angular velocity received immediately before the release operation to calculate the drive target value of the shift lens. Then, in S405, the lens control unit 113 outputs a drive signal to the driver 114 to drive the shift lens.

  In S406, the lens control unit 113 determines whether the exposure has ended. If the exposure has not ended, the process returns to S404. When the exposure is completed, the lens control unit 113 returns the shift lens to the center position. Then, the process returns to S401. By the above operation, the panning speed and the shift of the movement of the subject are corrected by the movement of the shift lens, and the follow shot assist is performed.

FIG. 2 is a flow chart for explaining an example of calculation processing of the main subject angular velocity in S412 of FIG.
Hereinafter, with reference to FIG. 2, a process of detecting repetitive motion of an object, which is a feature of the present invention, will be described in detail. In S201, the camera control unit 132 acquires gyro data between frames. In S202, the camera control unit 132 acquires vector data of the main subject selected by the subject determination unit 151. Then, in S203, the main subject angular velocity calculation unit 152 calculates the main subject angular velocity based on the gyro data and the vector data of the main subject. In step S204, the camera control unit 132 stores the main subject angular velocity calculated in step S204.

  Next, in S205, the camera control unit 132 functions as a reversal detection unit, and determines whether the main subject angular velocity calculated this time from the previously stored main subject angular velocity crosses 0, that is, the sign of the main subject angular velocity is reversed. Do. If it is detected that the main subject angular velocity has crossed zero (the sign of the main subject angular velocity has been inverted), the process proceeds to S206. If the main subject angular velocity does not cross 0 (the sign of the main subject angular velocity is not reversed), the process proceeds to S211.

  Next, in S206, the camera control unit 132 determines whether the main subject angular velocity for a predetermined period (time) or more is stored. If the main subject angular velocity for the predetermined period or more is not stored, the process proceeds to S212. Then, at S212, the camera control unit 132 sets the value of the angular velocity calculated at S203 as the main subject angular velocity. The follow shot control unit 118 drives the shift lens group 104 based on the main subject angular velocity. That is, the follow shot assist control based on the main subject angular velocity is performed. If the main subject angular velocity for a predetermined period or more is stored, the process proceeds to S207.

  In S207, the camera control unit 132 functions as an amplitude detection unit, and detects (confirms) the amplitude of the main subject angular velocity. Subsequently, in S208, the camera control unit 132 determines whether the amplitude of the main subject angular velocity is equal to or greater than a predetermined threshold. If the amplitude of the main subject angular velocity is not equal to or greater than the threshold, the process proceeds to S212. If the amplitude of the main subject angular velocity is greater than or equal to the threshold, the process proceeds to S209.

  In S209, the camera control unit 132 sets a main subject repetition flag. The main subject repeat flag indicates that the main subject is in repetitive motion. Subsequently, at S210, the camera control unit 132 sets the main subject angular velocity to zero. A main subject angular velocity of 0 means that the subject is not moving. Therefore, the lens control unit 113 drives the shift lens based on the gyro data without performing the follow shot assist operation. That is, in S404 of FIG. 4, since the main subject angular velocity is 0, the follow shot control unit 118 calculates the drive target value of the shift lens based on the gyro data. As a result, the drive control of the shift lens is switched to the normal image stabilization control (image stabilization control), and overcorrection is not performed.

FIG. 3 is a view showing an example of the change of the object angular velocity in the vertical direction.
In FIG. 3, the horizontal axis indicates time. The vertical axis represents the magnitude of the object angular velocity. FIG. 3A shows the object angular velocity in the vertical direction when the photographer holds the camera at the normal position and moves the camera according to the person who is running. As shown in FIG. 3A, the amplitude is large, and the frequency of the amplitude is almost fixed, and is 2 Hz or more. That is, the time until the maximum value (PP value) of the amplitude can be detected is less than 0.4 seconds, and a large amplitude can be detected in a short time.

  FIG. 3B shows an example of the change in the object angular velocity in the vertical direction when the photographer holds the camera at the normal position and moves the camera in accordance with the movement of the car. In particular, although the object angular velocity crosses zero due to a vector detection error, the amplitude of the angular velocity has a small value. Therefore, by comparing the amplitude with the threshold value, it can be determined that the movement of the subject shown in FIG. 3B is not a repetitive motion but a vector detection error.

  FIG. 3C shows an example of the change in the object angular velocity when the car is moving from a distance to a position almost right beside. In this example, the subject angular velocity is shown not in the vertical direction but in the horizontal direction. Under normal circumstances, the change in angular velocity is slow when the object is far and is maximum immediately beside, so the locus of angular velocity is drawn as shown by a solid line. However, when an offset is mounted on the gyro, as indicated by a broken line, the locus may move in parallel and cross zero. However, in this case, since the change in angular velocity is gradual, only a small amplitude can be detected by providing a threshold in the time of detecting the amount of change in angular velocity. As a result, it can be determined that the movement of the subject shown in FIG. 3C is not a repetitive movement. That is, by performing the processes of S206 and S208 in FIG. 2, it is possible to reliably detect whether or not the movement of the subject is the repetitive movement.

  It returns to the explanation of FIG. In step S211, the camera control unit 132 determines whether the main subject repetition flag is currently set. If the main subject repeat flag is not set, the process proceeds to S212. If the main subject repeat flag is set, it is determined that the subject is in repetitive motion at present. Therefore, the process proceeds to step S213 and subsequent steps to determine whether to release the determination that the subject is repetitively moving.

  In S213, the camera control unit 132 increments the counter. The counter indicates the time after the main subject angular velocity has not crossed zero. In S214, the camera control unit 132 determines whether the counter is equal to or more than a predetermined value. If the counter is not equal to or greater than the predetermined value, the process is ended. If the counter is greater than or equal to the predetermined value, the process proceeds to S215. In step S215, the camera control unit 132 determines that the repetitive motion state is over, clears the main subject repetitive flag, and clears the counter. Then, the process proceeds to S212.

  When the angle of view becomes wider by using a lens with a focal length on the wider side, the ratio of the subject to the screen decreases, so the lens on the tele side is used even if repetitive motion is performed. The amount of amplitude of the subject is smaller than when it is used. Therefore, the camera control unit 132 may change the threshold value corresponding to the amplitude used in the determination process of S208 of FIG. 2 according to the focal length of the lens being used. For example, the camera control unit 132 reduces the threshold as the focal length decreases, and increases the threshold as the focal length increases.

  In addition, when sign inversion of the main object angular velocity is detected a plurality of times, the possibility of repetitive motion is higher. Therefore, when the camera control unit 132 detects a plurality of code inversions, the threshold value corresponding to the amplitude may be changed according to the number of code inversions. For example, when the number of times of sign inversion of the main subject angular velocity is detected a plurality of times, the camera control unit 132 reduces the threshold corresponding to the amplitude.

(Example 2)
The imaging apparatus according to the second embodiment checks not only the sign inversion of the main object angular velocity but also the sign inversion of the angular acceleration that is the difference between the main object angular velocities, when detecting the repetitive motion of the object. As a result, even when the gyro offset is very large, it is possible to accurately detect the presence or absence of repetitive motion of the subject. The configuration of the imaging apparatus of the second embodiment is the same as that of the imaging apparatus of the first embodiment.

FIG. 5 is a flowchart for explaining the calculation process of the main subject angular velocity in the second embodiment.
S501 is the same operation as S201 to S204 in FIG. 2, and the description will be omitted. In step S502, the camera control unit 132 calculates the angular acceleration by storing the difference of the main object angular velocity for each frame. Subsequently, in step S503, the camera control unit 132 determines whether the zero cross of the main subject angular velocity, that is, the sign inversion is detected, with reference to the main subject angular velocity as in S205 of FIG. If the sign inversion is detected, the process proceeds to S505. Steps S505 to S514 are the same as steps S206 to S215 in FIG. If the sign inversion has not occurred, the process proceeds to S504.

  In step S504, the camera control unit 132 determines whether the zero crossing of the angular acceleration, that is, the sign inversion is detected. If the sign inversion of the angular acceleration is detected, the process proceeds to S505. If the sign inversion of the angular acceleration has not occurred, the process proceeds to S510.

FIG. 6 is a diagram for explaining the relationship between the main subject angular velocity and the angular acceleration.
FIG. 6A shows the main object angular velocity and the angular acceleration when there is no offset in the gyro data. As shown in FIG. 6A, the main object angular velocity and the angular acceleration are out of phase by 90 degrees. Therefore, by checking both angular velocity and angular acceleration data, it is possible to quickly confirm that the subject is performing repetitive motion.

  FIG. 6B shows the main object angular velocity and the angular acceleration when there is an offset in the gyro data. In the example shown in FIG. 6B, although the data of the main object angular velocity is repetitively moving, the zero crossing (inversion of the sign) does not occur. Therefore, since the repetitive motion can not be detected only by the angular velocity, the image may be blurred due to overcorrection. However, in the second embodiment, it is determined in S504 of FIG. 5 whether or not the zero cross of the angular acceleration has occurred, and when the zero cross of the angular acceleration occurs, the repetitive motion is detected by proceeding to the processing of S505. It becomes possible.

  According to the imaging apparatus of the second embodiment, it is possible to shorten the detection time regarding whether or not the subject repetitively moves, and it is possible to reliably detect repetitive movement even if there is an offset in the gyro data. As a result, detection of repetitive motions becomes more reliable, and it is possible to prevent the image from being blurred by erroneously overcorrecting during follow-up shooting. Although the 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 present invention.

(Other embodiments)
The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. Can also be realized. It can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

113 lens control unit 132 camera control unit

Claims (10)

An image blur correction apparatus that corrects blur of an image of a subject captured by an imaging unit through an imaging optical system by an image blur correction unit,
Calculation means for calculating the amount of movement of the subject from the shake detection signal detected by the shake detection means and the captured image;
And control means for controlling the image shake correcting means based on the detection signal of the shake or the output of the calculating means.
The control means controls the image shake correction means on the basis of the detection signal of the shake in accordance with the amplitude of the output of the calculation means in a predetermined period when reverse of the sign of the output of the calculation means is detected. An image blur correction apparatus, comprising: switching between execution of a first control to be performed and execution of a second control for controlling the image blur correction means based on an output of the calculation means. Inversion detection means for detecting inversion of the sign of the output of the calculation means;
Amplitude detection means for detecting the amplitude of the output of the calculation means during the predetermined period;
The image shake correction apparatus according to claim 1, wherein the control means executes the first control when the detected amplitude is equal to or higher than a threshold. The image blur correction apparatus according to claim 2, wherein the control unit changes the threshold according to the number of times the sign of the output of the calculation unit is inverted. The image shake correction apparatus according to claim 3, wherein the control means reduces the threshold value when inversion of the sign of the output of the calculation means is detected a plurality of times. The image blur correction apparatus according to any one of claims 2 to 4, wherein the control unit changes the threshold according to a focal length of the imaging optical system. The image blur correction apparatus according to claim 5, wherein the control unit increases the threshold as the focal length of the imaging optical system increases. The calculation means outputs the angular velocity of the subject as the movement amount,
The control means performs execution of the first control and execution of the second control in accordance with presence or absence of detection of reversal of sign of angular acceleration of the subject detected based on angular velocity of the subject. The image blurring correction device according to any one of claims 1 to 6, wherein the switching is performed. The image blur correction device according to any one of claims 1 to 7, wherein the image blur correction unit includes a correction lens that corrects an image blur by changing an imaging position of light from the subject. Correction device. An image shake correction apparatus according to any one of claims 1 to 8.
An imaging apparatus comprising: the imaging unit. It is a control method executed by an image blur correction apparatus that corrects blur of an image of a subject captured by an imaging unit through an imaging optical system by an image blur correction unit,
Calculating the amount of movement of the subject from the shake detection signal detected by the detection means and the captured image;
And a control step of controlling the image shake correcting means on the basis of the detection signal of the shake or an output in the calculation step.
In the control step, when reversal of the sign of the output in the calculation step is detected, the image blur correction means based on the detection signal of the shake according to the amplitude of the output in the calculation step in a predetermined period A control method of an image shake correction apparatus, comprising: switching between execution of a first control for controlling and execution of a second control for controlling the image shake correction means based on an output of the calculation means.

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