JP2012160930A - Projector and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector and control method thereof capable of improving convenience in correcting trapezoidal distortion.SOLUTION: A vertical direction manual correction function for correcting a trapezoidal distortion in a vertical direction is allocated to vertical direction keys 44a, 44b. A volume adjustment function for adjusting the volume of sound to be output from a speaker is allocated to horizontal direction keys 44c, 44d. A lateral direction manual correction function for manually correcting a trapezoidal distortion in a lateral direction is not allocated to any operation keys since the use frequency of the function is not higher than those of the vertical direction manual correction function and the volume adjustment function. Only after the trapezoidal distortion is automatically corrected based on the detection result of a posture detection part, the lateral direction manual correction function is temporarily allocated to the horizontal direction keys 44c, 44d.

Description

  The present invention relates to a projector that projects an image and a control method thereof.

  When a projector that projects an image is installed with an inclination with respect to the projection surface, a phenomenon (trapezoidal distortion) occurs in which the displayed image is deformed into a trapezoidal shape. For this reason, various techniques for automatically correcting trapezoidal distortion according to the installation state of the projector have been proposed (see, for example, Patent Document 1). After the trapezoidal distortion is automatically corrected by such a technique, there is a case where it is desired to finely adjust the correction amount manually in order to correct the trapezoidal distortion more appropriately. Further, in a projector that can automatically correct only the vertical keystone distortion, there is a case where it is desired to manually correct the horizontal keystone distortion after correcting the vertical keystone distortion automatically.

JP 2004-187052 A

  However, the frequency of correcting trapezoidal distortion is low except when the projector is installed, and due to cost, design, space, etc., a dedicated operation key for manually correcting keystone distortion is arranged on the projector. Often not. In such a projector, it is necessary to perform a correction operation after opening a menu screen for performing various settings, etc., and opening an operation screen for manually correcting keystone distortion by following the menu. Has a problem that it is complicated and inconvenient.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes an image projection unit that projects an image, a detection unit that detects an installation state of the projector, and a trapezoidal distortion of the image projected from the image projection unit. An automatic correction unit that corrects based on the detection result of the detection unit, an input operation unit that receives an input operation to an operation key to which a predetermined function is assigned, and correction of the trapezoidal distortion of the image by the automatic correction unit Accordingly, a control unit that temporarily assigns a manual correction function for accepting an operation for correcting the shape of the image to the operation key; and an operation of the image according to an operation on the operation key to which the manual correction function is assigned. And a manual correction unit for correcting the shape.

  According to this projector, the manual correction function is temporarily assigned to the operation key of the input operation unit in accordance with the correction (automatic correction) based on the detection result of the detection unit. Normally, the manual correction function is often used to compensate the automatic correction after the automatic correction. Therefore, when the manual correction function is temporarily assigned to the operation key as the automatic correction is performed, the keystone distortion Convenience at the time of correcting is improved. In addition to the automatic correction, other functions can be assigned to the operation keys, so that the operation keys can be used effectively.

  Application Example 2 In the projector according to the application example described above, an operation screen for assisting an operation for correcting the shape of the image after the trapezoidal distortion correction for the image by the automatic correction unit is displayed on the image projection unit. The manual correction unit corrects the shape of the image according to an operation on the operation key to which the manual correction function is assigned while the operation screen is displayed. You may do it.

  According to this projector, since the operation screen for assisting the operation for manually correcting the shape of the image is displayed after the correction (automatic correction) based on the detection result of the detection unit, the correction to compensate for the automatic correction is performed. Convenience when performing manually is improved.

  Application Example 3 In the projector according to the application example, a confirmation screen for inquiring whether or not to correct the shape of the image is corrected from the image projection unit after the trapezoidal distortion correction for the image by the automatic correction unit. When the input operation unit accepts an input operation indicating that the shape of the image is corrected as a response to the inquiry by the confirmation screen, the operation screen display unit further includes a confirmation screen display unit to project. The operation screen may be projected.

  According to this projector, when a confirmation screen for inquiring whether or not to correct the shape of the image is projected and a response indicating correction is received, the operation screen is projected. There is no need to project an operation screen for manual correction.

  Application Example 4 A projector control method according to this application example is a projector control method for projecting an image, and includes a detection step of detecting an installation state of the projector, and a trapezoidal distortion of the image. In accordance with the automatic correction step for correcting based on the detection result in the above and the trapezoidal distortion correction for the image in the automatic correction step, the shape of the image is assigned to the operation key to which a predetermined function is assigned. A function changing step for temporarily assigning a manual correction function for accepting an operation for correction; and a manual correction step for correcting the shape of the image in accordance with an operation on the operation key to which the manual correction function is assigned. It is characterized by having.

  According to this projector control method, the manual correction function is temporarily assigned to the operation key in accordance with the correction (automatic correction) based on the detection result in the detection step. Normally, the manual correction function is often used to compensate the automatic correction after the automatic correction. Therefore, when the manual correction function is temporarily assigned to the operation key as the automatic correction is performed, the keystone distortion Convenience at the time of correcting is improved. In addition to the automatic correction, other functions can be assigned to the operation keys, so that the operation keys can be used effectively.

  Application Example 5 In the projector control method according to the application example described above, an operation screen that assists an operation for correcting the shape of the image after the correction of the trapezoidal distortion for the image in the automatic correction step. An operation screen display step for projecting is further provided, and in the manual correction step, the shape of the image is corrected according to an operation on the operation key to which the manual correction function is assigned while the operation screen is projected. It may be.

  According to this projector control method, after the correction based on the detection result in the detection step (automatic correction), an operation screen for assisting an operation for manually correcting the shape of the image is displayed. Convenience at the time of performing correction to compensate for manually improves.

  Application Example 6 In the projector control method according to the application example, after the trapezoidal distortion correction for the image in the automatic correction step, a confirmation screen for inquiring whether to correct the shape of the image is projected. A confirmation screen display step to be performed; and a response step for accepting a response to the inquiry by the confirmation screen. In the operation screen display step, a response indicating that the shape of the image is corrected is accepted in the response step. In this case, the operation screen may be projected.

  According to this projector control method, a confirmation screen for inquiring whether or not to correct the shape of an image is projected, and an operation screen is projected when a response indicating correction is received. In this case, it is not necessary to project an operation screen for manual correction.

It is the perspective view which shows a projector, (a) is the figure seen from the front, (b) is the figure seen from back. 1 is a block diagram showing a schematic configuration of a projector. The top view which shows the operation panel of a projector. It is explanatory drawing for demonstrating correction | amendment of the trapezoid distortion of a vertical direction, (a) is a side view of a projector, (b), (d) is a front view of a projection surface, (c) is a liquid crystal light valve. FIG. 6 is a flowchart illustrating the operation of the projector when correcting trapezoidal distortion in the first embodiment. It is explanatory drawing for demonstrating correction | amendment of the trapezoid distortion of a horizontal direction, (a) is a top view of a projector, (b), (d) is a front view of a projection surface, (c) is a liquid crystal light valve. FIG. 9 is a flowchart illustrating the operation of a projector when correcting trapezoidal distortion in the second embodiment. Explanatory drawing which shows an operation screen. Explanatory drawing which shows a confirmation screen.

(First embodiment)
The projector according to the first embodiment will be described below with reference to the drawings.

1A and 1B are perspective views illustrating a projector according to the present embodiment, in which FIG. 1A is a diagram viewed from the front, and FIG. 1B is a diagram viewed from the rear.
As shown in FIGS. 1A and 1B, the projector 1 includes a housing 2 that accommodates the apparatus main body, and a user performs an input operation on the upper surface 2t of the housing 2. An operation panel 22 is disposed. An image / audio input unit 23 having a plurality of input terminals is provided on the rear surface 2r of the housing 2. Image information and audio information are input to the image / audio input unit 23 from an external image supply device (not shown). Is done. An opening 3 for exposing the projection lens 13 is formed on the front surface 2 f of the housing 2, and an image based on the image information is projected from the projection lens 13 onto the front projection surface S.

  On the bottom surface of the housing 2, one leg portion (foot 4) is provided on the front side and two on the rear side. Among these, the front leg portion (front foot 4 a) projects from the bottom surface of the housing 2. The length (projection amount) can be adjusted. When the protrusion amount of the front foot 4a is minimized, the projector 1 is in a posture substantially parallel to the installation surface. At this time, the optical axis of the projection lens 13 is perpendicular to the projection surface S. Then, as the projection amount of the front foot 4a is increased, the projector 1 is inclined so that the front surface 2f side of the housing 2 is lifted, and the projection position of the image is moved upward.

FIG. 2 is a block diagram illustrating a schematic configuration of the projector 1, and FIG. 3 is a plan view illustrating the operation panel 22 of the projector 1.
As shown in FIG. 2, the projector 1 includes an image projection unit 10, a control unit 20, a storage unit 21, an operation panel 22, an image audio input unit 23, an image processing unit 24, an OSD processing unit 25, an image correction unit 26, an audio. A processing unit 27, a speaker 28, an attitude detection unit 29, and the like are provided, and these are accommodated in the housing 2.

  The image projection unit 10 includes a light source device 11 as a light source, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a liquid crystal drive unit 14, and the like. The image projection unit 10 corresponds to a display unit. The image projection unit 10 modulates light emitted from the light source device 11 into image light using the liquid crystal light valves 12R, 12G, and 12B, and projects the image light from the projection lens 13. The image is displayed on the projection surface S.

  The light source device 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. Has been. The light emitted from the light source device 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), which are the three primary colors of light by a color separation optical system (not shown), After being separated into blue (B) color light components, they are incident on the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valves 12R, 12G, and 12B are configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal light valves 12R, 12G, and 12B include a rectangular pixel region 12a in which a plurality of pixels (not shown) are arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel. ing. When the liquid crystal driving unit 14 applies a driving voltage corresponding to the input image information to each pixel, each pixel is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source device 11 is modulated by transmitting through the pixel regions 12a of the liquid crystal light valves 12R, 12G, and 12B, and image light corresponding to image information is formed for each color light. The formed image light of each color is synthesized for each pixel by a color synthesis optical system (not shown) to become color image light, and then enlarged and projected by the projection lens 13.

  The control unit 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and the projector is operated by the CPU operating according to a control program stored in the storage unit 21. 1 operation is controlled. That is, the control unit 20 functions as a computer together with the storage unit 21.

  The storage unit 21 includes a nonvolatile memory such as a flash memory, a mask ROM (Read Only Memory), and an FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like.

  The operation panel 22 corresponds to an input operation unit that receives an input operation of the user, and includes a plurality of operation keys for the user to give various instructions to the projector 1. As shown in FIG. 3, the operation panel 22 of this embodiment includes a power key 41, an input switching key 42, a menu key 43, four direction keys 44 corresponding to up, down, left and right, an enter key 45, and an ESC (Escape) key. Operation keys such as 46 and help key 47 are included. When the user operates various operation keys on the operation panel 22, the operation panel 22 receives this operation and outputs a control signal corresponding to the operated operation key to the control unit 20. Then, when a control signal is input from the operation panel 22, the control unit 20 controls the operation of the projector 1 and performs processing based on the input control signal. Instead of the operation panel 22 or together with the operation panel 22, a remote control (not shown) capable of remote operation may be used as the input operation unit. In this case, the remote control transmits an infrared operation signal corresponding to the user's operation content, and a remote control signal receiving unit (not shown) receives this and transmits it to the control unit 20.

  As described above, the image / sound input unit 23 includes a plurality of input terminals. These input terminals include various types of image information and other information from an external image supply device (not shown) such as a video playback device and a personal computer. Audio information is input. The image / sound input unit 23 outputs the input image information to the image processing unit 24, and outputs the input sound information to the sound processing unit 27.

  The image processing unit 24 converts various types of image information input from the audio / video input unit 23 into image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B, that is, a drive voltage applied to each pixel. Convert to image information for prescription. Further, the image processing unit 24 performs an image quality adjustment process for adjusting the image quality such as brightness, contrast, sharpness, hue, and the like on the converted image information based on an instruction from the control unit 20. Is output to the OSD processing unit 25.

  Based on an instruction from the control unit 20, the OSD processing unit 25 displays a menu image, a message image, or the like on an image based on image information input to the image / audio input unit 23 (hereinafter referred to as “input image”). A process for superimposing and displaying an OSD (on-screen display) image is performed. The OSD processing unit 25 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image. When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 25 reads the necessary OSD image information from the OSD memory, and the image processing unit so that the OSD image is superimposed at a predetermined position on the input image. The OSD image information is combined with the image information input from 24. The image information combined with the OSD image information is output to the image correction unit 26. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 25 outputs the image information input from the image processing unit 24 to the image correction unit 26 as it is.

  The image correction unit 26 performs processing for correcting trapezoidal distortion that occurs when an image is projected from an oblique direction with respect to the projection surface S. Specifically, the image correction unit 26, based on an instruction from the control unit 20, has an image forming region 12e (see FIG. 4) having a shape that can cancel the trapezoidal distortion in the pixel regions 12a of the liquid crystal light valves 12R, 12G, and 12B. (See (c)). Then, the image information input from the OSD processing unit 25 is corrected so that an input image is formed in the image forming area 12e, and a black pixel value, that is, a pixel value outside the image forming area 12e, that is, The pixel value is set so that the light transmittance is minimized. The image correction unit 26 outputs the image information corrected as described above to the liquid crystal drive unit 14. When there is no instruction to correct the trapezoidal distortion from the control unit 20, the image correction unit 26 outputs the image information input from the OSD processing unit 25 to the liquid crystal driving unit 14 as it is. In this case, the entire pixel area 12a becomes the image forming area 12e, and an input image is formed in the entire pixel area 12a.

  Thereafter, when the liquid crystal drive unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the image correction unit 26, the liquid crystal light valves 12R, 12G, and 12B modulate the image light according to the image information. The image light is projected from the projection lens 13.

  The audio processing unit 27 appropriately performs processing such as sound quality adjustment processing and volume adjustment processing on the audio information input from the image / audio input unit 23 based on an instruction from the control unit 20. Then, the processed sound information is supplied to the speaker 28 and the sound based on the sound information is output from the speaker 28.

  The posture detection unit 29 is configured by an acceleration sensor or the like, and detects the installation state of the projector 1, that is, the vertical inclination (posture) of the projector 1. The posture detection unit 29 outputs the detection result to the control unit 20, and the control unit 20 instructs the image correction unit 26 to correct the vertical keystone distortion based on the detection result of the posture detection unit 29.

4A and 4B are explanatory diagrams for explaining correction of trapezoidal distortion in the vertical direction. FIG. 4A is a side view of the projector 1, FIGS. 4B and 4D are front views of the projection surface S, and FIG. ) Is a front view of the liquid crystal light valves 12R, 12G, and 12B.
For example, as shown in FIG. 4A, when the projector 1 is tilted so that the optical axis A of the projection lens 13 faces obliquely upward by projecting the front foot 4a, FIG. ), The projected image Po (input image Pi) is deformed and displayed in a trapezoidal shape that expands upward. For this reason, as shown in FIG. 4C, the control unit 20 causes the image correction unit 26 to set the shape of the image forming region 12e to be reduced toward the upper side so that the trapezoidal distortion is offset, An input image is formed in the image forming area 12e. As a result, as shown in FIG. 4D, the trapezoidal distortion is corrected, and the input image Pi is displayed in a rectangular shape. Although illustration is omitted, when the projector 1 is tilted so that the optical axis A of the projection lens 13 faces obliquely downward, the projected image is deformed into a trapezoidal shape that expands downward. The control unit 20 causes the image correction unit 26 to set the shape of the image forming region 12e so that the shape is reduced toward the lower side. As described above, the vertical (vertical) trapezoidal distortion is automatically corrected based on the inclination of the projector 1 detected by the attitude detection unit 29 without the user manually performing a correction operation.

  As shown in FIG. 3, among the four direction keys 44 of the operation panel 22, the direction key 44 corresponding to the up and down direction (the up direction key 44a and the down direction key 44b) is manually subjected to vertical trapezoidal distortion. A function for correction (hereinafter referred to as “vertical direction manual correction function”) is assigned, and the user can manually fine-tune vertical trapezoidal distortion. When the user operates the up and down direction keys 44a and 44b, the control unit 20 instructs the image correction unit 26 to adjust the shape of the image forming area 12e according to the operation. Specifically, when the up key 44a is operated, the control unit 20 instructs the image correction unit 26 to reduce the upper side of the image forming area 12e by a predetermined amount, and the down key 44b is pressed. When operated, the lower side of the image forming area 12e is reduced by a predetermined amount. If the up key 44a is operated while the lower side of the image forming area 12e is contracted, the control unit 20 reduces the lower side instead of reducing the upper side of the image forming area 12e. Return only a fixed amount. Similarly, when the down key 44b is operated while the upper side of the image forming area 12e is reduced, the control unit 20 reduces the upper side instead of reducing the lower side of the image forming area 12e. Return by a predetermined amount.

  In addition, the direction key 44 (left direction key 44c and right direction key 44d) corresponding to the left and right direction has a function of adjusting the volume of the sound output from the speaker 28 (hereinafter referred to as “volume adjustment function”). When the user operates the left and right direction keys 44c and 44d, the control unit 20 instructs the audio processing unit 27 to perform a process of increasing or decreasing the volume. Specifically, when the left direction key 44c is operated, the control unit 20 decreases the volume by a predetermined amount, and when the right direction key 44d is operated, the volume is increased by a predetermined amount.

  As described above, in the present embodiment, the vertical manual correction function is assigned to the up and down direction keys 44a and 44b, but the function of manually correcting the horizontal trapezoidal distortion (hereinafter referred to as the “horizontal manual correction function”). Is not assigned to any of the operation keys because it is not used more frequently than the vertical manual correction function and the volume adjustment function. However, after the trapezoidal distortion is automatically corrected based on the detection result of the posture detection unit 29, the horizontal manual correction function is temporarily assigned to the left and right direction keys 44c and 44d. .

FIG. 5 is a flowchart showing the operation of the projector 1 when correcting the trapezoidal distortion. When the user changes the attitude (tilt) of the projector 1, the projector 1 operates according to the flow shown in FIG.
As shown in FIG. 5, in step S <b> 101, the posture detection unit 29 detects the inclination of the projector 1 and outputs the detection result to the control unit 20.

  In step S <b> 102, the control unit 20 causes the image correction unit 26 to correct (automatic correction) the vertical keystone distortion based on the detection result of the posture detection unit 29. That is, the control unit 20 instructs the image correction unit 26 to set the shape of the image forming region 12e according to the inclination of the projector 1 detected by the posture detecting unit 29, and the input image is input to the image forming region 12e. To form.

  In step S103, the control unit 20 temporarily changes the function assignment to the left and right direction keys 44c and 44d. Specifically, a horizontal manual correction function is temporarily assigned to the left and right direction keys 44c and 44d in place of the volume adjustment function assigned so far.

  Here, the trapezoidal distortion in the horizontal direction will be described. For example, as shown in FIG. 6A, when the projector 1 is tilted so that the optical axis A of the projection lens 13 is directed obliquely to the left with respect to the projection surface S, as shown in FIG. Thus, the projected image Po (input image Pi) is displayed in a trapezoidal shape that expands toward the left side. In this case, as shown in FIG. 6C, if the shape of the image forming region 12e is set so as to be reduced toward the left side so that the trapezoidal distortion is offset, the shape shown in FIG. As described above, the trapezoidal distortion is corrected, and the input image Pi is displayed in a rectangular shape. Although illustration is omitted, when the projector 1 is tilted so that the optical axis A of the projection lens 13 faces obliquely to the right with respect to the projection surface S, the projected image is enlarged toward the right side. Deforms into a trapezoidal shape. In this case, if the shape of the image forming area 12e is set to be reduced toward the right side, the input image Pi is displayed in a rectangular shape.

  In the present embodiment, when the left direction key 44c is operated in a state where the horizontal direction manual correction function is assigned to the left and right direction keys 44c and 44d, the control unit 20 instructs the image correction unit 26. Then, the left side of the image forming area 12e is reduced by a predetermined amount, and when the right direction key 44d is operated, the right side of the image forming area 12e is reduced by a predetermined amount. If the left key 44c is operated while the right side of the image forming area 12e is contracted, the control unit 20 reduces the right side by a predetermined amount instead of reducing the left side of the image forming area 12e. Just return. Similarly, when the right key 44d is operated while the left side of the image forming area 12e is contracted, the control unit 20 reduces the left side instead of reducing the right side of the image forming area 12e. Return only a fixed amount.

  Returning to FIG. 5, in step S104, the control unit 20 determines whether or not the up and down direction keys 44a and 44b are operated. When the up / down direction keys 44a, 44b are operated, the process proceeds to step S105, and when the up / down direction keys 44a, 44b are not operated, the process proceeds to step S106.

  When the up / down direction keys 44a, 44b are operated and the process proceeds to step S105, the control unit 20 corrects the vertical keystone distortion in the image correction unit 26 according to the operated direction keys 44a, 44b (manually). Correction) and return to step S104.

  In step S106, the control unit 20 determines whether or not the left and right direction keys 44c and 44d are operated. When the left and right direction keys 44c and 44d are operated, the process proceeds to step S107, and when the left and right direction keys 44c and 44d are not operated, the process proceeds to step S108.

  When the left and right direction keys 44c and 44d are operated and the process proceeds to step S107, the control unit 20 corrects the lateral keystone distortion in the image correction unit 26 according to the operated direction keys 44c and 44d (manually). Correction) and return to step S104.

  In step S108, the control unit 20 determines whether or not the up / down / left / right direction key 44 is not operated for a predetermined time. Then, if it continues for a predetermined time, the process proceeds to step S109, and if it does not continue for a predetermined time, the process returns to step S104.

  When the state in which none of the direction keys 44 is operated continues for a predetermined time and the process proceeds to step S109, the control unit 20 restores the function assignment to the left and right direction keys 44c and 44d. That is, the volume adjustment function is again assigned to the left and right direction keys 44c and 44d, and the flow ends.

  Since the projector 1 of the present embodiment operates as described above, when the user changes the attitude (tilt) of the projector 1, this change is detected by the attitude detection unit 29, and the vertical generated with the inclination of the projector 1. Directional trapezoidal distortion is automatically corrected. After that, the user can finely adjust the automatically corrected vertical trapezoidal distortion by operating the direction key 44, and easily correct the horizontal trapezoidal distortion that is not automatically corrected. Can do.

  As described above, according to the projector 1 of the present embodiment, the horizontal manual correction function is temporarily provided in the left and right direction keys 44c and 44d as the correction (automatic correction) based on the detection result of the posture detection unit 29 is performed. Assigned. Usually, the function of manually correcting the trapezoidal distortion is often used to compensate the automatic correction after the automatic correction. Therefore, the horizontal manual correction function is temporarily assigned to the direction keys 44c and 44d. Convenience when correcting the keystone distortion is improved. Further, since other functions (volume adjustment functions) can be assigned to the left and right direction keys 44c and 44d except when automatic correction is performed, various operation keys on the operation panel 22 are effectively used. It becomes possible. In the present embodiment, the image correction unit 26 when performing correction based on the detection result of the posture detection unit 29 in step S102 corresponds to an automatic correction unit, and correction according to the operation of the direction key 44 in steps S105 and S107. The image correction unit 26 when performing the process corresponds to a manual correction unit.

(Second Embodiment)
Hereinafter, the projector according to the second embodiment will be described with reference to the drawings.
The projector of this embodiment has the same configuration as that of the first embodiment, but the operation of the projector 1 when correcting the trapezoidal distortion is different from that of the first embodiment.

FIG. 7 is a flowchart showing the operation of the projector 1 when correcting the trapezoidal distortion in the second embodiment. When the user changes the attitude (tilt) of the projector 1, the projector 1 operates according to the flow shown in FIG.
As shown in FIG. 7, in step S <b> 201, the posture detection unit 29 detects the inclination of the projector 1 and outputs the detection result to the control unit 20.

  In step S202, the control unit 20 causes the image correction unit 26 to correct (automatic correction) the vertical keystone distortion based on the detection result of the posture detection unit 29. That is, the control unit 20 instructs the image correction unit 26 to set the shape of the image forming region 12e according to the inclination of the projector 1 detected by the posture detecting unit 29, and the input image is input to the image forming region 12e. To form.

  In step S203, the control unit 20 instructs the OSD processing unit 25 to superimpose an operation screen Pc for assisting an operation for manually correcting the trapezoidal distortion (see FIG. 8).

  As shown in FIG. 8, the operation screen Pc includes correction values Nv and Nh indicating correction states of trapezoidal distortion in the vertical direction and the horizontal direction, and bar graph-like indicators Iv and Ih. The trapezoidal distortion can be manually corrected while confirming the correction state with the correction values Nv and Nh and the indicators Iv and Ih. In the operation screen Pc, vertical trapezoidal distortion can be corrected by operating the upper and lower direction keys 44a and 44b, and horizontal trapezoidal distortion can be corrected by operating the left and right direction keys 44c and 44d. And a notation indicating that the correction of the trapezoidal distortion can be ended by operating the ESC key 46.

  Returning to FIG. 7, in step S204, the control unit 20 temporarily changes the assignment of functions to the left and right direction keys 44c and 44d. Specifically, a horizontal manual correction function is temporarily assigned to the left and right direction keys 44c and 44d in place of the volume adjustment function assigned so far. Thereafter, as shown in the operation screen Pc, the user can manually correct the vertical trapezoidal distortion by operating the up and down direction keys 44a and 44b, and the left and right direction keys 44c and 44d. By operating, it becomes possible to manually correct the trapezoidal distortion in the lateral direction.

  In step S205, the control unit 20 determines whether or not the up / down direction keys 44a and 44b are operated. If the up / down direction keys 44a, 44b are operated, the process proceeds to step S206. If the up / down direction keys 44a, 44b are not operated, the process proceeds to step S207.

  When the up / down direction keys 44a, 44b are operated and the process proceeds to step S206, the control unit 20 corrects the vertical keystone distortion in the image correction unit 26 according to the operated direction keys 44a, 44b (manually). Correction) and return to step S205.

  In step S207, the control unit 20 determines whether the left and right direction keys 44c and 44d are operated. If the left and right direction keys 44c and 44d are operated, the process proceeds to step S208. If the left and right direction keys 44c and 44d are not operated, the process proceeds to step S209.

  When the left and right direction keys 44c and 44d are operated and the process proceeds to step S208, the control unit 20 corrects the horizontal keystone distortion in the image correction unit 26 according to the operated direction keys 44c and 44d (manually). Correction) and return to step S205.

  In step S209, the control unit 20 determines whether or not the ESC key 46 has been operated. When the ESC key 46 is operated, the process proceeds to step S210, and when the ESC key 46 is not operated, the process returns to step S205.

  When the ESC key 46 is operated and the process proceeds to step S210, the control unit 20 restores the function assignment to the left and right direction keys 44c and 44d. That is, the volume adjustment function is reassigned to the left and right direction keys 44c and 44d.

  In step S211, the control unit 20 ends the superimposed display of the operation screen Pc and ends the flow.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
According to the projector 1 of the present embodiment, the operation screen Pc for manually correcting the trapezoidal distortion is displayed after the correction (automatic correction) based on the detection result of the attitude detection unit 29, so that the automatic correction is compensated. Convenience when performing correction manually is improved. In the present embodiment, the control unit 20 and the OSD processing unit 25 when displaying the operation screen Pc correspond to the operation screen display unit.

  Further, before displaying the operation screen Pc in step S203, the control unit 20 displays a confirmation screen Pa as shown in FIG. 9 on the OSD processing unit 25 to determine in advance whether or not to manually correct the trapezoidal distortion. You may make it inquire. In this confirmation screen Pa, two items “Yes” and “No” are described as a response to the inquiry “Do you want to correct manually?”, And the user selects a desired item with the direction key 44. Then, a response can be made by operating the enter key 45. When “Yes” is selected as a response to the inquiry, that is, when the operation panel 22 receives an input operation indicating that the trapezoidal distortion is manually corrected, the process proceeds to step S203 and the operation screen Pc is displayed. If “No” is displayed, that is, if the operation panel 22 receives an input operation indicating that manual correction is not performed, the flow may be terminated without displaying the operation screen Pc. According to this aspect, it is not necessary to display the operation screen Pc for manual correction in a situation where only automatic correction is sufficient. The control unit 20 and the OSD processing unit 25 for displaying the confirmation screen Pa correspond to the confirmation screen display unit.

(Modification)
Moreover, you may change the said embodiment as follows.

  In the above embodiment, the user manually corrects the trapezoidal distortion after the automatic correction in many cases, so that the function assignment to the left and right direction keys 44c and 44d is changed after the automatic correction. However, the timing for changing the function assignment is not limited to after automatic correction. For example, the function assignment may be changed during the automatic correction, or the function assignment may be changed immediately before the automatic correction is performed.

  In the above embodiment, the vertical direction manual correction function is always assigned to the upper and lower direction keys 44a and 44b, and the horizontal direction manual correction function is temporarily assigned to the left and right direction keys 44c and 44d after automatic correction. However, the vertical direction manual correction function may be temporarily assigned to the up / down direction keys 44a and 44b after the automatic correction. The combinations of the respective functions and the operation keys are not limited to the above, and various combinations are possible, and they may be assigned to operation keys other than the direction keys 44.

  In the above embodiment, both vertical and horizontal trapezoidal distortions can be manually corrected. However, the present invention is not limited to this configuration, and it is a configuration that can manually correct only one direction of trapezoidal distortion. Also good.

  In the above embodiment, only the trapezoidal distortion in the vertical direction is automatically corrected. However, the trapezoidal distortion in the horizontal direction may be automatically corrected. For example, based on the imaging unit capable of imaging the projection plane S, the frame of the projection plane S (for example, a screen) included in the image (captured image) captured by the imaging unit, and the outline of the projected image, the projection plane S In this case, the projector 1 is provided with image analysis means for deriving the vertical and horizontal tilts of the projector 1 with respect to the vertical direction and the horizontal trapezoidal distortion is corrected based on the derived result. it can. In this case, the imaging unit and the image analysis unit correspond to the posture detection unit.

  In the above embodiment, the three-plate projector 1 using the three liquid crystal light valves 12R, 12G, and 12B as the light modulation device has been described. However, the present invention is not limited to this. For example, a mode in which each pixel is modulated into image light by a single liquid crystal light valve including sub-pixels that can transmit R light, G light, and B light can be employed.

  In the above-described embodiment, the transmissive liquid crystal light valves 12R, 12G, and 12B are used as the light modulator, but a reflective light modulator such as a reflective liquid crystal light valve can also be used. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  In the above embodiment, the light source device 11 is constituted by the discharge-type light source lamp 11a. However, the light source device 11 may be applied to a solid light source such as an LED (Light Emitting Diode) light source or a laser light source, or other light sources. it can.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Housing | casing, 2f ... Front surface, 2r ... Back surface, 2t ... Upper surface, 3 ... Opening part, 4 ... Foot, 4a ... Front foot, 10 ... Image projection part, 11 ... Light source apparatus, 11a ... Light source lamp , 11b ... reflector, 12R, 12G, 12B ... liquid crystal light valve, 12a ... pixel area, 12e ... image forming area, 13 ... projection lens, 14 ... liquid crystal drive unit, 20 ... control unit, 21 ... storage unit, 22 ... operation Panel, 23 ... Image / audio input unit, 24 ... Image processing unit, 25 ... OSD processing unit, 26 ... Image correction unit, 27 ... Audio processing unit, 28 ... Speaker, 29 ... Attitude detection unit, 41 ... Power key, 42 ... Input switching key, 43 ... Menu key, 44 ... Direction key, 44a ... Up direction key, 44b ... Down direction key, 44c ... Left direction key, 44d ... Right direction key, 45 ... Enter key, 46 ... ESC key , 47 ... Help key, S ... projection surface, Po ... image, Pi ... input image, Pc ... operation screen, Pa ... confirmation screen, Nv, Nh ... correction value, Iv, Ih ... indicator.

Claims (6)

A projector,
An image projection unit for projecting an image;
A detection unit for detecting an installation state of the projector;
An automatic correction unit for correcting trapezoidal distortion of the image projected from the image projection unit based on a detection result of the detection unit;
An input operation unit that receives an input operation to an operation key to which a predetermined function is assigned;
A control unit that temporarily assigns a manual correction function for receiving an operation for correcting the shape of the image to the operation keys in accordance with the correction of the trapezoidal distortion for the image by the automatic correction unit;
A manual correction unit that corrects the shape of the image in response to an operation on the operation key to which the manual correction function is assigned;
A projector characterized by comprising: The projector according to claim 1,
An operation screen display unit for projecting an operation screen for assisting an operation for correcting the shape of the image from the image projection unit after the trapezoidal distortion correction for the image by the automatic correction unit;
The projector, wherein the manual correction unit corrects the shape of the image according to an operation on the operation key to which the manual correction function is assigned while the operation screen is displayed. The projector according to claim 2,
After the correction of the trapezoidal distortion for the image by the automatic correction unit, the image projection unit further includes a confirmation screen display unit for projecting a confirmation screen for inquiring whether to correct the shape of the image,
The operation screen display unit projects the operation screen when the input operation unit receives an input operation indicating that the shape of the image is corrected as a response to the inquiry on the confirmation screen. Projector. A method of controlling a projector that projects an image,
A detection step of detecting an installation state of the projector;
An automatic correction step of correcting trapezoidal distortion of the image based on the detection result in the detection step;
As the trapezoidal distortion correction is performed on the image in the automatic correction step, a manual correction function for temporarily accepting an operation for correcting the shape of the image is assigned to an operation key to which a predetermined function is assigned. A function change step to be assigned,
A manual correction step of correcting the shape of the image in response to an operation on the operation key to which the manual correction function is assigned;
A projector control method comprising: The projector control method according to claim 4,
An operation screen display step of projecting an operation screen for assisting an operation for correcting the shape of the image after the correction of the trapezoidal distortion for the image in the automatic correction step;
In the manual correction step, the shape of the image is corrected according to an operation on the operation key to which the manual correction function is assigned while the operation screen is projected. A projector control method according to claim 5, comprising:
A confirmation screen display step for projecting a confirmation screen for inquiring whether or not to correct the shape of the image after correction of the trapezoidal distortion for the image in the automatic correction step;
A response step of accepting a response to the inquiry by the confirmation screen,
In the operation screen display step, the operation screen is projected when a response indicating that the shape of the image is corrected is received in the response step.

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