JP2014077933A - Image projector, image projection method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily synchronize projected plural pieces of image data.SOLUTION: An image division part 101 divides one piece of image data into plural pieces of image data. A detection signal addition part 103 adds prescribed information to prescribed areas in the plural pieces of image data. An image projection part 105 projects the plural pieces of image data having the prescribed information added thereto in a state in which the prescribed areas are superimposed among the plural pieces of image data. An output timing detection part 106 images the projected plural pieces of image data, and performs synchronization determination among the plural pieces of image data on the basis of the imaged image data corresponding to the prescribed areas. The output timing adjustment part 104 adjusts a timing for projecting the plural pieces of image data on the basis of the determination result.

Description

  The present invention relates to a technique for synchronizing a plurality of image data divided and projected from one image data.

  In recent years, a multi-projector system in which images projected by a plurality of projectors are combined to form one screen has been put into practical use. In addition, in a multi-projector system, when images projected from a plurality of projectors are combined, a method of projecting the edges of the images so as to overlap each other has been developed so that the boundary between the images is not visually recognized. .

  In a multi-projector system, since a single screen is created by a plurality of projectors, it is necessary to match the timing at which each projector projects a partial image forming a certain screen. Techniques for matching this timing are disclosed in Patent Documents 1 and 2.

  The technique disclosed in Patent Document 1 is as follows. That is, the master computer outputs the master side vertical synchronization signal to each slave computer. The slave computer is a technique of observing the time difference between the vertical synchronization signal on the slave side and the vertical synchronization signal on the master side and changing the horizontal / vertical scan rate and the pixel clock rate so as to eliminate the time difference.

  The technique disclosed in Patent Document 2 is as follows. That is, the plurality of image display devices is a technique of acquiring the current time and matching the start timing of the display update cycle with the set time calculated from the preset start time and the current time.

JP 2004-85730 A JP 2008-197383 A

  However, the above-described technique has the following problems. That is, in the technique disclosed in Patent Document 1, even if the time difference is eliminated by the synchronization control unit that compares the vertical synchronization signal on the master side and the vertical synchronization signal on the slave side, there is a delay in the transmission of the synchronization signal itself. The output result is not always a synchronized result. In the technique disclosed in Patent Document 2, the same reference time is essential for all projectors.

  Therefore, an object of the present invention is to easily synchronize a plurality of projected image data.

  An image projection apparatus according to the present invention includes a dividing unit that divides one image data into a plurality of image data, an adding unit that adds predetermined information to a predetermined area in the plurality of image data, and a plurality of image data. And projecting means for projecting the plurality of image data to which the predetermined information is added in a state where the predetermined area is overlaid; and imaging means for capturing the plurality of image data projected by the projecting means; A determination unit that performs synchronization determination between the plurality of image data based on the image data corresponding to the predetermined region imaged by the imaging unit, and a projection unit that determines based on a determination result by the determination unit. Adjusting means for adjusting a timing at which the plurality of image data are projected.

  According to the present invention, it is possible to easily synchronize a plurality of projected image data.

It is a figure which shows the structure of the principal part of the multi projector system which concerns on embodiment of this invention. It is a figure which shows the example of input image data, edge blend processed image data, and overlap area information. It is a figure which shows the example of the detection symbol used by embodiment of this invention. It is a figure which shows the example of the projection period of image data 1 and 2, and an imaging timing. It is a figure which shows the detection symbol on the image data 1, the detection symbol on the image data 2, the detection symbol after superimposition, and the detection symbol imaged. It is a figure which shows the example of the component of the color which each color has. It is a figure which shows the image data 1, the image data 2, and an imaging timing. It is a figure which shows the detection symbol on the image data 1, the detection symbol on the image data 2, the detection symbol after superimposition, and the detection symbol imaged. It is a figure which shows the example of the component of the color which each color has. It is a flowchart which shows the process of the multi projector system which concerns on embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments to which the invention is applied will be described in detail with reference to the accompanying drawings. Here, an example will be described in which one input image data is divided into image data projected by two projectors, and ends of the respective image data projected by the two projectors are superimposed and displayed.

  FIG. 1 is a diagram showing a configuration of main parts of a multi-projector system according to an embodiment of the present invention. As shown in FIG. 1, the multi-projector system according to the present embodiment includes an image dividing unit 101, a detection symbol determination unit 102, a detection symbol addition unit 103, an output timing adjustment unit 104, an image projection unit 105, and an output timing detection unit 106. Is provided. Note that the multi-projector system according to the present embodiment is an example of an image projection apparatus.

  The image dividing unit 101 divides one input image data into image data projected by two projectors. The detection symbol determination unit 102 determines a detection symbol to be added to each image data to be projected. The detection symbol adding unit 103 adds the detection symbol determined by the detection symbol determination unit 102 to each image data to be projected. The output timing adjustment unit 104 adjusts the output timing of each image data to which the detection symbol is added for each projector. The image projection unit 105 projects the image data to which the detection symbol is added. The output timing detection unit 106 obtains a result of superimposing detection symbols on the projected image data, and detects output timing information between a plurality of projectors.

  In the present embodiment, the image data projected by the two projectors is image data that has been subjected to edge blending processing in which the respective end portions are superimposed and displayed after projection. The edge blending process itself is a known technique, and is a technique used in recent years when displaying one image with a plurality of projectors.

  The image dividing unit 101 receives the input image data 107, divides the input image data 107 into two image data, and performs edge blend processing on each of the divided image data to thereby obtain two edge blend processed images. Data 108 is output. Further, the image dividing unit 101 outputs overlapping area information 109 indicating an overlapping area by the edge blending process to the detection symbol determining unit 102.

  FIG. 2A shows an example of the input image data 107. FIG. 2B shows an example of two edge blend processed image data 108. That is, 202 and 204 in FIG. 2B are edge blended image data projected by two projectors. Reference numerals 203 and 205 in FIG. 2B denote areas on which edge blend processing has been performed (hereinafter referred to as edge blend processing regions) in the edge blend processed image data. FIG. 2C shows an example of the overlapping area information 109. As shown in FIG. 2C, the overlapping area information 109 is composed of output areas 206 and 208 and overlapping areas 207 and 209. The detection symbol determination unit 102 performs processing for determining detection symbols to be added to the two edge blend processed image data 108.

  Here, FIG. 3 is a diagram illustrating an example of detection symbols used in the embodiment of the present invention. FIG. 3A shows detection symbols 301 and 302 that are superimposed on the edge blend processing region of image data projected from two projectors. As shown in FIG. 3A, the positions of the detection symbols 301 and 302 to be superimposed on the edge blend processing region change with time. The change speed of the position of the detection symbols 301 and 302 is defined by the number of vertical lines along which the detection symbols 301 and 302 move and the number of frames in which the change of the detection symbols 301 and 302 occurs. In FIG. 3A, the detection symbols 301 and 302 are changed every frame, but may be changed every several frames.

  FIGS. 3B and 3C show how the detection symbols overlap when the edge blend processing regions of the edge blend processed image data projected from the two projectors are overlapped. That is, FIG. 3B shows how the detection symbols overlap when the image data projected from the two projectors is synchronized. When the image data are synchronized with each other, the detected symbols overlap with each other without deviation, so that only the detected symbol 303 after superposition having the color resulting from the superposition is observed. FIG. 3C shows how the detection symbols overlap when the image data projected from the two projectors is not synchronized. If the image data is not synchronized, the result of superimposing the detection symbols is shifted, and the detection symbol 305 after superimposition having the color resulting from the superimposition is superimposed on the color of the detection symbol before superimposition. A detection symbol 304 and a detection symbol 306 having a color mixed with the color of the detection symbol after being combined are observed.

  When determining the detection symbol, the detection symbol determination unit 102 receives the overlap region information 109 from the image division unit 101, and detects the detection symbol to be superimposed on each image data based on the shape of the overlap region included in the overlap region information 109. 110 is determined. Then, the detection symbol determination unit 102 outputs the detection symbol 110 to the detection symbol addition unit 103.

  In addition, the detection symbol determination unit 102 outputs synchronization determination information 112 to the output timing detection unit 106. The synchronization determination information 112 is information for determining whether or not synchronization is achieved, and is information for determining how much the synchronization is shifted when synchronization is not achieved.

  The detection symbol determination unit 102 receives the synchronization determination result 113 from the output timing detection unit 106 and changes the detection symbol 110 output to the detection symbol addition unit 103 according to the synchronization determination result 113.

  The detection symbol addition unit 103 adds the detection symbol 110 input from the detection symbol determination unit 102 to the edge blended image data 108 and outputs the detection symbol-added image data 111. The detection symbol adding process is a transparent synthesis process similar to the process of superimposing graphics such as OSD on image data.

  The output timing adjustment unit 104 receives the detection symbol-added image data 111, adjusts the output timing according to the timing adjustment amount 114 input from the output timing detection unit 106, and outputs the output timing adjusted image data 115. The adjustment of the output timing is performed independently for each of the plurality of detection symbol-added image data 111.

  The image projection unit 105 receives the output timing adjusted image data 115 and outputs the projection image data 116. In the present embodiment, the image projection unit 105 is a liquid crystal projector. Each liquid crystal projector has the same output frame rate.

  The output timing detection unit 106 acquires detected symbol overlap information 117 from the projection image data 116. The detection symbol overlap information 117 is acquired by imaging an area where detection symbols overlap. The imaging period is the minimum number of frames in which the detection symbol changes. For example, when the detection symbol is changed every frame, the imaging period is 1 frame, and when the detection symbol is changed every 3 frames, the imaging period is 3 frames.

  Further, the output timing detection unit 106 determines whether or not synchronization is established from the acquired detected symbol overlap information 117. This determination is performed by comparing the detected symbol overlap information 117 and the synchronization determination information 112 input from the detected symbol determination unit 102.

  Further, the output timing detection unit 106 outputs a synchronization determination result 113, which is a determination result of whether or not synchronization is established, to the detected symbol determination unit 102. Further, the output timing detection unit 106 outputs the timing adjustment amount 114 to the output timing adjustment unit 104 when it is necessary to adjust the output timing based on the determination of whether or not synchronization is established. The timing adjustment amount 114 is determined from the relative deviation between the outputs of a plurality of projectors, which is calculated together with the synchronization determination.

  Here, a method for determining whether or not synchronization is established will be described with reference to FIGS. FIG. 4 is a diagram illustrating the timing of the image data 1 projected from one projector, the timing of the image data 2 projected from the other projector, and the imaging timing. FIG. 5 is a diagram showing detection symbols on the image data 1, detection symbols on the image data 2, detection symbols after superimposition, and detection symbols to be imaged.

  In FIG. 4, 401 indicates a period during which the (N-1) th frame of the image data 1 is projected. Similarly, reference numeral 402 denotes a period during which the Nth frame of the image data 1 is projected. Reference numeral 403 denotes a period during which the (N + 1) th frame of the image data 1 is projected. Reference numeral 404 denotes a period during which the (N−1) th frame of the image data 2 is projected. Reference numeral 405 denotes a period during which the Nth frame of the image data 2 is projected. Reference numeral 406 denotes a period during which the (N + 1) th frame of the image data 2 is projected. Reference numeral 407 denotes an imaging period. Reference numeral 408 in the imaging period 407 indicates an imaging period of the (N−1) frame of the image data 1 and the (N−1) frame of the image data 2. Reference numeral 409 in the imaging period 407 indicates an imaging period of N frames of the image data 1 and N frames of the image data 2. Reference numeral 410 in the imaging period 407 indicates the imaging period of the (N + 1) frame of the image data 1 and the (N + 1) frame of the image data 2.

  Reference numeral 501 denotes an edge blend processing area of the (N−1) th frame of the image data 1 projected in the period 401. Reference numeral 502 denotes a detection symbol of the (N−1) th frame of the image data 1 projected in the period 401. Similarly, reference numeral 503 denotes an edge blend processing area of the Nth frame of the image data 1 projected in the period 402. Reference numeral 504 denotes a detection symbol of the Nth frame of the image data 1 projected in the period 402. Reference numeral 505 denotes an edge blend processing region of the (N−1) th frame of the image data 2 projected in the period 404. Reference numeral 506 denotes a detection symbol of the (N−1) th frame of the image data 2 projected in the period 404. Reference numeral 507 denotes an edge blend processing area of the Nth frame of the image data 2 projected in the period 405. Reference numeral 508 denotes a detection symbol of the Nth frame of the image data 2 projected in the period 405. Reference numeral 509 denotes an edge blend processing region after the period 408 is superimposed. Reference numeral 510 denotes a detection symbol after superposition in the period 408. Similarly, reference numeral 511 denotes an edge blend processing region after the period 409 is superimposed. Reference numerals 512, 513, and 514 denote detection symbols after superposition in the period 409. Reference numeral 515 denotes an edge blend processing region after the period 410 is superimposed. Reference numeral 516 denotes a detection symbol after superposition in the period 410. Reference numeral 517 denotes an edge blend processing area that is imaged in the imaging period 407. Reference numerals 518, 519, and 520 indicate detection symbols after superposition that are imaged in the imaging period 407. The detection symbols imaged in the imaging period 407 are synthesized by weighting the detection symbols after superimposition in the periods 408, 409, and 410 by the length of each period. Since the region of the detection symbol 518 after superposition is always the same within the imaging period 407, the same color as the detection symbols 510, 512, and 516 is detected. The region of the detection symbol 519 after superimposition is the detection symbol 510 in the period 408, the detection symbol 513 in the period 409, and none in the period 410, so that they are weighted by the length of the period. The color is the sum of the colors. The region of the detection symbol 520 after the superimposition is not in the period 408, is the detection symbol 514 in the period 409, and is the detection symbol 516 in the period 410, so that they are weighted by the length of the period. And add the colors. The output timing detection unit 106 can detect the synchronization relationship between the projector that projects the image data 1 and the projector that projects the image data 2 based on the size and color of each area of the detection symbols 518, 519, and 520 to be imaged. it can.

  Here, a calculation method at the time of detecting the synchronization relationship will be described. In this calculation, the color of the detection symbols 502 and 504 is A, the color of the detection symbols 506 and 508 is B, and A and B of the detection symbols 510, 512, and 516 after superposition are superimposed. The color of the detected symbol 519 to be imaged is D, and the color of the detected symbol 520 to be imaged is E. Further, the ratios of the period 408, the period 409, and the period 410 to the imaging period 407 are 10%, 40%, and 50%, respectively. That is, in this example, the output timing of the image data 2 is delayed by 40% of one frame period with respect to the output timing of the image data 1.

  FIG. 6A shows the color components of the color D. FIG. 6B shows the color components of the color E. The output timing detection unit 106 recognizes the color A of the detection symbol superimposed on the image data 1, the color B of the detection symbol superimposed on the image data 2, and the color C of the detection symbol after superimposition. Therefore, after detecting the color D and the color E, the output timing detection unit 106 can reversely calculate the components, and calculates the components shown in FIGS. 6A and 6B. Among the calculation results, the ratio of the color A and color B components of the detection symbol before superimposition is a numerical value indicating the relative front-rear relationship between the image data 1 and the image data 2. In this example, 40% of the color A which is the color of the detection symbol added to the image data 1 is included in the lower color E which is the change direction of the detection symbol. In other words, it can be calculated that the output of the image data 1 is advanced by 40% of the imaging period relative to the output of the image data 2. In this example, since the imaging period is one frame, the output timing detection unit 106 determines that the image data 1 is advanced by 40% of one frame relative to the image data 2, that is, 0.4 frames. judge.

  7 to 9 show examples in which the image data 1 and the image data 2 are shifted by one frame or more. FIG. 7 shows image data 1, image data 2, and imaging timing. FIG. 8 shows detection symbols on the image data 1, detection symbols on the image data 2, detection symbols after superimposition, and detection symbols to be imaged.

  Reference numeral 821 denotes an edge blend processing area imaged in the imaging period 707, and reference numerals 822 to 826 denote superposed detection symbols to be imaged. Here, as in FIGS. 4 to 6, a method of calculating the synchronization deviation from the detected detection symbol after superimposition will be described. In this calculation, the color of the detection symbols 802 and 804 is A, and the color of the detection symbols 806 and 808 is B. A color after superimposing A and B of the detection symbols 810, 814, and 818 after superposition is C. Further, the color of the detection symbol 823 to be imaged is D, the color of the detection symbol 824 to be imaged is E, the color of the detection symbol 825 to be imaged is F, and the color of the detection symbol 826 to be imaged is G. To do.

  The ratios of the period 708, the period 709, and the period 710 with respect to the imaging period 707 are 10%, 50%, and 40%, respectively. That is, in the examples shown in FIGS. 7 to 9, the output timing of the image data 1 is delayed by one frame and 50% of one frame period with respect to the output timing of the image data 2.

  FIG. 9A shows the color components of the color D. FIG. 9B shows the color components of the color E. FIG. 9C shows the color components of the color F. FIG. 9D shows the color components of the color G. Among these components, the sum of the ratios of the color A and color B components of the detection symbol before superimposition is a numerical value indicating the relative front-rear relationship between the image data 1 and the image data 2. In this example, 60% of the color B that is the color of the detection symbol added to the image data 2 is included in the lower color F that is the change direction of the detection symbol, and 90% of the color B is included in the color G. That is, it can be calculated that the output of the image data 2 is advanced by a time corresponding to 150% of the imaging period relative to the output of the image data 1. Also in this example, since the imaging period is one frame, the output timing detection unit 106 advances the image data 2 by 150% of one frame relative to the image data 1, that is, 1.5 frames. It is determined.

  The above is the determination method for determining whether or not synchronization is performed by the output timing detection unit 106. Further, the criterion for determining that synchronization is established may be a determination method in which the relative difference is equal to or less than a certain threshold value. This may be determined according to the accuracy of synchronization desired to be realized.

  Next, processing of the multi-projector system according to the present embodiment will be described with reference to FIG. The flowchart shown in FIG. 10 is roughly divided into two phases. One is a detection symbol change timing adjustment phase from steps S1001 to S1005, and the other is an output timing adjustment phase from steps S1006 to S1011. Note that the processing shown in FIG. 10 is realized by a CPU provided in the multi-projector system according to the present embodiment reading out a necessary program or data from a recording medium such as a ROM, developing it in the RAM, and executing it. It is.

  In the detection symbol change timing adjustment phase, as shown in FIG. 3B, the detection symbols appear to overlap each other as a result of overlapping the detection symbols in a state before adjusting the output timing between the plurality of projectors. Next, the change speed of the detection symbol is adjusted (slowed down). Thereby, it is avoided that it becomes impossible to determine which of the plurality of projectors the output timing of the projector is relatively delayed at the initial change speed of the detected symbol. Further, in the output timing adjustment phase, the synchronization between the plurality of projectors is adjusted by repeating the adjustment of the output timing from the projector and the change of the detection symbol change speed.

  In step S1001, the detection symbol determination unit 102 determines a detection symbol to be added and an initial change speed. In determining the initial detection symbol, the overlapping region 207 and the overlapping region 209 included in the overlapping region information 109 are used. The detection symbol determination unit 102 determines the size and color of the detection symbol added to the output image data of each projector and the change rate of the initial detection symbol of the detection symbol based on the sizes of the overlapping region 207 and the overlapping region 209. As a result, the detection symbol determination unit 102 determines detection symbols to be added to the outputs of the plurality of projectors as the detection symbol 301 and the detection symbol 302. The change speed of the initial detection symbol does not necessarily change every frame.

  In step S1002, the output timing detection unit 106 detects the output timing. As described above, the output timing detection method is performed by acquiring the detection symbol overlap information 117 from the region where the detection symbols overlap in the projection image data 116.

  In step S1003, the output timing detection unit 106 performs synchronization determination from the output timing detection result. The synchronization determination is performed based on the detection result obtained in step S1002 and the synchronization determination information 112 input from the detected symbol determination unit 102. The synchronization determination information 112 is the detection symbol 301 and the detection symbol 302 determined by the detection symbol determination unit 102 and the change rate information of the detection symbol. Based on the detection symbol 301 and the detection symbol 302, the output timing detection unit 106 calculates that the result of superimposition when synchronization is obtained becomes the detection symbol 303 after superimposition. Then, according to the determination method described above, it is determined whether or not there is a synchronization shift, and if there is a synchronization shift, a relative shift amount is calculated.

  In step S1004, the detected symbol determination unit 102 determines whether or not there is a synchronization loss. If there is a synchronization error, the process proceeds to step S1005. On the other hand, if there is no synchronization loss, the process proceeds to step S1006.

  In step S <b> 1005, the detection symbol determination unit 102 changes the detection symbol to be added to the image data using the synchronization determination result 113 input from the output timing detection unit 106. The synchronization determination result 113 includes a relative speed difference between the two image data. In step S1005, the change speed of the detected symbol is reduced so that the relative speed difference with respect to the imaging period is smaller than the threshold value for determining that there is a synchronization shift. Through the steps S1001 to S1005, the detection symbol change timing adjustment phase is completed.

  In step S1006, the detected symbol determination unit 102 determines whether or not the target synchronization accuracy has been reached. Note that the state immediately before step S1006 is a state in which there is no synchronization shift. In this step 1006, it is determined whether or not the threshold when it is determined that there is no synchronization deviation is equal to or less than the target synchronization accuracy. If the threshold value when it is determined that there is no synchronization shift is equal to or less than the target synchronization accuracy, the process ends. On the other hand, if the threshold value when it is determined that there is no synchronization deviation is larger than the target synchronization accuracy, the process proceeds to step S1007.

  In step S <b> 1007, the detection symbol determination unit 102 changes the detection symbol to be added to the image data using the synchronization determination result 113 input from the output timing detection unit 106. In step S1007, the detection symbol determination unit 102 increases the change rate of the detection symbol, contrary to step S1005. The detection symbol determination unit 102 increases the rate of change and simultaneously decreases the threshold value for determining that there is a synchronization shift. By repeating this step 1007, the detection symbol change rate gradually increases and the threshold value gradually decreases. The detection symbol determination unit 102 changes the detection symbol, and then outputs the detection symbol after the change to the detection symbol addition unit 103. Further, the detection symbol determination unit 102 outputs the synchronization determination information 112 to the output timing detection unit 106.

  In step S1008, the output timing detection unit 106 detects the output timing. This step S1008 is the same processing as step S1002. In step S1009, the output timing detection unit 106 performs synchronization determination from the output timing detection result. In step S1009, in addition to the processing in step S1003, when it is determined by synchronization determination that there is a synchronization shift, the relative shift amount is output to the output timing adjustment unit 104 as the timing adjustment amount 114.

  In step S1010, the output timing detection unit 106 determines whether or not there is a synchronization error. If there is a synchronization loss, the process proceeds to step S1011. On the other hand, if there is no synchronization loss, the process returns to step S1006.

  In step S1011, the output timing adjustment unit 104 adjusts the output timing. The output timing adjustment unit 104 receives the timing adjustment amount 114 from the output timing detection unit 106. Basically, the timing adjustment is performed by delaying the output of the relatively advanced image data by the timing adjustment amount. A method of delaying the output of image data is performed by holding a line buffer or a frame buffer inside and holding it in the buffer for a period corresponding to the adjustment amount. However, if it is determined that the delay is excessively delayed by performing this step a plurality of times, the timing is adjusted by reducing the delay amount by the timing adjustment amount.

  The output timing adjustment phase is completed through steps S1006 to S1011 described above. By completing this phase, output synchronization among a plurality of projectors is realized.

  According to the above-described embodiment, in a multi-projector system in which a plurality of projectors form one screen, it is possible to easily synchronize the projection timing between projection image data from each projector.

  The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

  101: Image division unit, 102: Detection symbol determination unit, 103: Detection symbol addition unit, 104: Output timing adjustment unit, 105: Image projection unit, 106: Output timing detection unit, 107: Input image data, 116: Projection image Data, 117: Detection symbol overlap information

Claims (6)

A dividing means for dividing one image data into a plurality of image data;
Adding means for adding predetermined information to a predetermined area in the plurality of image data;
Projecting means for projecting the plurality of image data to which the predetermined information is added in a state in which the predetermined region is overlapped between the plurality of image data;
Imaging means for imaging the plurality of image data projected by the projection means;
Determination means for performing synchronization determination between the plurality of image data based on image data corresponding to the predetermined area imaged by the imaging means;
An image projecting apparatus comprising: an adjusting unit configured to adjust a timing at which the plurality of image data is projected by the projecting unit based on a determination result by the determining unit.   When the determination unit determines that there is a synchronization shift between the plurality of image data, the determination unit calculates an amount of synchronization shift between the plurality of image data based on the image data corresponding to the predetermined region, The image projecting apparatus according to claim 1, wherein the adjusting unit adjusts a timing at which the plurality of image data is projected by the projecting unit based on the amount of synchronization deviation.   The image projection apparatus according to claim 2, wherein the determination unit calculates an amount of synchronization deviation between the plurality of image data based on a color of the image data corresponding to the predetermined region.   4. The image projection apparatus according to claim 1, wherein the predetermined region is a region subjected to edge blending processing among the plurality of image data. 5. An image projection method executed by an image projection apparatus,
A division step of dividing one image data into a plurality of image data;
An adding step of adding predetermined information to a predetermined area in the plurality of image data;
A projecting step of projecting the plurality of image data to which the predetermined information is added in a state in which the predetermined region is overlapped between the plurality of image data;
An imaging step of imaging the plurality of image data projected by the projecting step;
A determination step of performing a synchronization determination between the plurality of image data based on the image data corresponding to the predetermined region imaged in the imaging step;
An image projection method comprising: an adjustment step of adjusting a timing at which the plurality of image data is projected by the projection step based on a determination result by the determination step. A division step of dividing one image data into a plurality of image data;
An adding step of adding predetermined information to a predetermined area in the plurality of image data;
A projecting step of projecting the plurality of image data to which the predetermined information is added in a state in which the predetermined region is overlapped between the plurality of image data;
An imaging step of imaging the plurality of image data projected by the projecting step;
A determination step of performing a synchronization determination between the plurality of image data based on the image data corresponding to the predetermined region imaged in the imaging step;
A program for causing a computer to execute an adjustment step of adjusting a timing at which the plurality of image data is projected by the projection step based on a determination result of the determination step.

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