JP2012249008A - Multiplex projection control apparatus, multiplex projection control method and multiplex projection control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiplex projection control apparatus for erasing a shadow on a screen while projection light to an object is suppressed.SOLUTION: A camera 1 photographs a video on a screen projected by projectors 7-1 and 7-2. An image input section 2 acquires image data from the camera 1. A frame managing section 3 transfers image information (frame number) used for shadow erasure and illumination suppression. A content DB (database) 4 supplies contents of multiplex projection to shadow region correction sections 5-1 and 5-2 corresponding to the projectors 7-1 and 7-2. The shadow region correction sections 5-1 and 5-2 correct output luminance values of the projectors 7-1 and 7-2 on the basis of the image information (frame number). Projection light suppressing sections 6-1 and 6-2 suppress projection light of the projectors 7-1 and 7-2 to the object.

Description

  The present invention relates to a multiple projection control apparatus, a multiple projection control method, and a multiple projection control program.

  Multi-projector systems are used for various purposes. For example, there is a tiling method in which images from the projectors are connected to generate a huge image. It is also expected as an application for displaying HDR (High Dynamic Range) images. Generally, when using a front projection using a projector for a presentation at a conference or conference presentation, if there is a subject in front of the screen, a shadow is generated on the screen. In order to eliminate the shadow, a method (Non-patent Document 1) for determining which projector is concealed and compensating for the missing luminance of the shadow is known. In addition, since the projection light of the projector is illuminated on the subject, it is necessary to suppress the projection light on the human eye or the human body.

  When multiple screens are simultaneously projected by a plurality of projectors, an output luminance value from the projectors is adjusted according to the brightness of the environment in order to project an original image on the screen. Non-Patent Document 2 discloses a luminance correction method using a projector camera system. In this method, attention is paid to the correlation between the RGB luminance values from the projector and the RGB luminance values observed by the camera, and a predetermined RGB is used using a 3 × 3 matrix V called a color mixing matrix. The RGB output value P = (Pr, Pg, Pb) from the projector is corrected so that the camera observes the luminance value C = (Cr, Cg, Cb).

This principle can be extended as the number of projectors increases. In a multi-projector system equipped with N projectors, all projectors project a predetermined area in multiple projections, and a camera captures the projection area. In this system, the observed image luminance value C and the output luminance P _j from each projector form a linear model represented by the following equation (1).

V _j is the color mixing matrix of projector j, and F is the illumination from the light source other than the projector and the ambient light including the black offset of all projectors (since the screen is fixed, the reflectance of the object surface Is considered constant). In order to obtain the color mixing matrix and ambient light of one projector k, all projectors other than the projector k are projected with P _j = (0, 0, 0), j ≠ k.

  Since the system at this time is simplified as a simple projector camera system of the projector k and the camera, if four sample images can be prepared, it can be obtained using Non-Patent Document 2. However, although Non-Patent Document 2 can be applied in luminance correction for one projector and camera, in order to apply to N projectors, output from all projectors while satisfying the condition of Equation (1). A device to correct the brightness is required.

J. Summet, M. Flagg, TJ Cham, JM Rehg, and R. Sukthankar: “Shadow Elimination and Blinding Light Suppression for Interactive Projected Displays”, IEEE Transactions on Visualization and Computer Graphics, vol.13, no.3, pp. 508-517, 2007. K. Fujii, MD Grossberg, and SK Nayar: “A Projector-Camera System with Real-Time Photometric Adaptation for Dynamic Environments”, Proc. Of IEEE Computer Vision and Pattern Recognition (CVPR), vol.1, pp.814-821 , 2005.

  In a multi-projector system, a switching method is used to detect projection light that strikes a subject. In this method, projection light from all pixels is output from a certain projector (projector k), and nothing is output from other projectors, and the image A is observed by the camera. Next, all the projection light from the projector k is turned off, and the image B is observed again by the camera. The difference is calculated for each pixel of the image A and the image B. When the difference is less than a certain allowable value (there is no change in luminance), it is determined that the projection light from the pixel illuminates the subject, and a certain allowable If it is equal to or greater than the value (there is a change in luminance), it is determined that the projection light from the pixel is not illuminating the subject.

  For pixels where projection light strikes the subject, luminance is not output from the pixels. This is called a switching method, and since other projectors do not output anything, it is possible to detect which pixel hits the subject by turning on / off only the luminance of one projector.

  In multiple projection using a multi-projector system, the output luminance from each projector must be well adjusted so as to satisfy Equation (1) within a range that does not exceed the dynamic range of the camera. In order to suppress illumination of a moving subject using the above-described switching, it is necessary to determine in advance whether or not projection light from a certain projector strikes the subject. In addition, it is difficult to smoothly detect the remaining projectors unless the brightness of the remaining projectors is turned off. Therefore, there is a problem in that it is inefficient to detect the pixels of the subject illumination by turning on and off the output luminance of the projectors one by one.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to suppress the projection light on the subject when a shadow occurs on the screen due to the concealment of the subject in the multi-projector system. Provided are a multi-projection control device, a multi-projection control method, and a multi-projection control program capable of correcting the luminance so as to eliminate the upper shadow and satisfy a predetermined condition within a range not exceeding the dynamic range of the camera. There is.

  In order to solve the above-described problem, the present invention provides a plurality of projectors that project a single image on a screen at different angles, an image capturing unit that captures an image projected on the screen, and an image captured by the image capturing unit. Based on the frame management means for managing the frame number of the image and the frame number managed by the frame management means, the brightness in the shadow area generated on the screen by the object existing in front of the screen is corrected for each corresponding projector. A plurality of shadow area correction means for controlling the projection light of the corresponding projector so that the projection light from the corresponding projector does not illuminate the object in synchronization with each of the plurality of shadow area correction means And a projection light suppression unit.

  Further, in order to solve the above-described problem, the present invention is a multiple projection control method, an imaging step in which one image projected on a screen by a plurality of projectors is captured by a camera, and the image is captured by the camera. A frame management step for managing the frame number of the captured image, and a luminance in a shadow region generated on the screen by an object existing in front of the screen for each corresponding projector based on the frame number managed in the frame management step. A shadow area correction step for correcting, and a projection light suppression step for suppressing the projection light of the corresponding projector so that the projection light from the corresponding projector does not illuminate the object in synchronization with the shadow area correction step. A multiple projection control method comprising:

  In order to solve the above-described problem, the present invention provides an image capturing function for capturing one image projected on a screen by a plurality of projectors on a computer of a multiple projection control apparatus. Based on the frame management function for managing the frame number of the image, and the frame number managed by the frame management function, the brightness in the shadow region generated on the screen by the object existing in front of the screen is corrected for each corresponding projector. In synchronization with the shadow area correction function and the shadow area correction function, the projection light suppression function for suppressing the projection light of the corresponding projector is executed so that the projection light from the corresponding projector does not illuminate the object. This is a featured multiple projection control program.

  According to the present invention, in a multi-projector system that projects to the same position using a plurality of projectors, the output luminance from the projector can be automatically corrected in accordance with the shadow generated on the screen. Therefore, it is possible to suppress the projection light on the subject in which the shadow is generated, and it is possible to maintain a high-quality and high-contrast projection state.

It is a block diagram which shows the structure of the multiple projection control apparatus by 1st Embodiment which concerns on this invention. It is a flowchart for demonstrating operation | movement of the multiple projection control apparatus by this 1st Embodiment. It is a flowchart for demonstrating operation | movement of the frame management part 3 by this 1st Embodiment. It is a flowchart for demonstrating operation | movement of the shadow area correction | amendment parts 5-1 and 5-2 by this 1st Embodiment. It is a flowchart for demonstrating operation | movement of the projection light suppression parts 6-1 and 6-2 by this 1st Embodiment. It is a block diagram which shows the structure of the multiple projection control apparatus using N projectors by this 2nd Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The present invention relates to a multi-projector system, and projects from each projector so that the luminance value of each pixel observed by a camera becomes a predetermined value with respect to an object shadow (subject shadow) generated on a screen. The output value of the pixel is corrected, and at the same time, the light is suppressed so that the projection light from each projector does not illuminate the subject.

A. First Embodiment First, a first embodiment of the present invention will be described. The first embodiment is characterized in that shadow cancellation and illumination suppression are performed in a multi-projector system including two projectors and one camera.

  FIG. 1 is a block diagram showing the configuration of the multiple projection control apparatus according to the first embodiment of the present invention. In FIG. 1, a camera 1 captures images on a screen projected by projectors 7-1 and 7-2 and outputs them as image data. The image input unit 2 acquires image data from the camera 1. The frame management unit 3 acquires image data from the image input unit 2 and transfers image information for use in shadowing and illumination suppression. The content DB (database) 4 holds multiple projection content (video), and appropriately supplies the video to the shadow area correction units 5-1 and 5-2 corresponding to the projectors 7-1 and 7-2. To do.

  The shadow area correction units 5-1 and 5-2 detect the luminance change of the video from the content DB 4 using the image information, and output the projectors 7-1 and 7-2 according to the luminance change. Correct the brightness value. The projection light suppression units 6-1 and 6-2 suppress the projection light on the subject of the projectors 7-1 and 7-2 according to the correction by the shadow area correction units 5-1 and 5-2, respectively.

  FIG. 2 is a flowchart for explaining the operation of the multiple projection control apparatus according to the first embodiment. First, an image is observed with the camera 1 (step Sa1), and frames of the image observed with the frame management unit 3 are managed (step Sa2). The frame management unit 3 manages frames so that the projectors 7-1 and 7-2 are alternately selected as main correction or sub correction. Next, it is determined whether or not it is a main correction (step Sa3). If it is a main correction (YES in step Sa3), it is determined whether or not it is a detection mode (step Sa4).

  If it is in the detection mode (YES in step Sa4), the projection light of the selected projector is suppressed (step Sa5). If the detection mode is not set (NO in step Sa4), the shadow region main correction (luminance correction) is performed on the video from the content DB 4 (step Sa6). Further, when the correction is not the main correction (NO in step Sa3), the shadow region sub-correction (luminance correction) is executed on the video from the content DB 4 (step Sa7).

  In either case, it is determined whether or not the process has been completed (step Sa8). If the process has not been completed (NO in step Sa8), the process returns to step Sa2 to repeat the above-described process. On the other hand, when the process ends (YES in step Sa8), the process ends.

  That is, first, one projector 7-1 or 7-2 is selected, and the output luminance from the projectors 7-1 and 7-2 is alternately corrected according to the image observed by the camera 1, and the shadow of the screen is corrected. Erase. Next, the brightness correction state of the shadow area by the correction is detected, and the projection light is suppressed according to the result. During this time, the brightness of the projectors 7-1 and 7-2 other than that is corrected on the screen using a known correction amount.

  In this configuration, the projectors 7-1, 7-2, the camera 1, and the content DB 4 do not necessarily have to be connected as components, and only need to acquire data necessary for processing. The flow of data from the frame management unit 3, the shadow area correction units 5-1, 5-2, and the projection light suppression units 6-1, 6-2 to the respective arrows is a hard disk, a RAID device, a CD-ROM, or the like. Either a recording medium or a remote data resource via a network may be used.

  The image input unit 2 is a means for acquiring an image, and image data captured by the camera 1 or the like is transferred to the frame management unit 3. As an example of an image acquired by the image input unit 2, an image that is captured without hiding the entire screen is used. For example, the camera 1 may be installed above the vicinity of the ceiling, and an image taken from the camera 1 so that only the screen is captured may be used.

  FIG. 3 is a flowchart for explaining the operation of the frame management unit 3 according to the first embodiment. First, a frame number for managing time-series images is initialized (step Sb1). Next, in order to acquire the image from the camera 1, it will be in a standby state (step Sb2). Then, it is determined whether or not an image has been observed (step Sb3). If no image is observed (NO in step Sb3), the process returns to step Sb2, and the standby state is continued.

  On the other hand, if an image is observed (YES in step Sb3), the image from the camera 1 is acquired (step Sb4), the frame number is updated (step b5), and the image is converted into a shadow area correction unit 5-1. 5-2, and simultaneously transmits an SW signal (hereinafter referred to as a frame number as an example) (step Sb6). When these processes are completed, the process returns to the standby state in step Sb2, and the above-described processes are repeated again.

Next, the basic principle of shadow area correction will be described. With respect to the two projectors 7-1 and 7-2, the color mixing matrixes V ₁ and V ₂ and the ambient light component F are obtained in advance setup. In the following description, the projector 7-1 is a main correction target, and the projector 7-2 is a sub correction target.

  First, the original luminance value C is distributed as shown in the following equations (2), (3), and (4).

Here, when the projector 7-1 is a main correction target, γ ₁ > γ ₂ is set.

  Next, the output luminances P1 and P2 from the projectors 7-1 and 7-2 are corrected as shown in the following equations (5) and (6) using the color mixing matrix and the ambient light, respectively.

  Subsequently, the corrected luminance value is output from each of the projectors 7-1 and 7-2. Assuming that the observed value C ′ is obtained by the camera 1 when these luminance values are projected on the screen, the relationship of the following equation (7) is established.

  In general, the projectors 7-1 and 7-2 mutually correct the luminance independently, so that the original luminance value C is not observed. Therefore, a luminance difference ΔC between the observed luminance value C ′ and the target luminance value C:

Is fed back, and the output luminance of the projector 7-1 that is the main correction target is corrected as shown in the following equation (9).

  On the other hand, the brightness of the projector 7-2 is corrected by Expression (6). That is, since the projector 7-2 outputs the same luminance as that in the initial state, the corrected luminance value is fixed. After this luminance correction, the corrected luminance values are output from the projectors 7-1 and 7-2 again.

On the other hand, when the projector 7-2 is the main correction target, γ ₂ > γ ₁ and when the projector 7-1 is the main correction target, the output luminance value correction processing of the projector 7-1 and the projector It is only necessary to replace the output luminance value correction process of 7-2. Therefore, in the feedback correction, the output luminance of the projector 7-2 that is the main correction target is corrected as shown in the following equation (10).

In this way, while switching the main correction target, the corrected luminance values P ₁ and P ₂ satisfying the following expression (11) are output from the respective projectors 7-1 and 7-2 to correct the luminance deficiency in the shadow area of the screen. To do.

  Next, the processing of the shadow area correction units 5-1 and 5-2 will be described based on the above principle. FIG. 4 is a flowchart for explaining the operation of the shadow area correction units 5-1 and 5-2 according to the first embodiment. The shadow area correction units 5-1 and 5-2 are in a standby state in the initial state and wait for reception of a frame number (step Sc <b> 1). When the frame number is received from the frame management unit 3, each of the shadow region correction units 5-1, 5-2 performs frame determination (step Sc2). In this frame determination, it is determined based on the frame number whether each of the projectors 7-1 and 7-2 is a main correction target projector or a sub correction target projector.

The main correction target is a single projector. In a multi-projector system composed of two projectors, the main correction and the sub correction are alternately switched. For example, from frame number # 1 to frame number # 2, projector 7-1 is determined as the main correction target, and from frame number # 3 to frame number # 4, projector 7-2 is determined as the main correction target. In the frame determination, if the received frame number is f in the subsequent frames, the projector 7-1 calculates the following equation (12), and if m ₁ or m ₂ is 0, the main correction and Determine (mod in equation (12) means remainder calculation).

In particular, when m ₂ is 0, the mode for detecting the projection light on the subject (processing of the projection light suppression unit 6-1) is also activated, and the shadow region correction unit 5-1 performs feedback correction of the shadow region. To do.

On the other hand, in the projector 7-2, the following equation (13) is calculated, and if m ₃ or m ₄ is 0, it is determined as main correction (mod in equation (13) means remainder calculation).

In particular, when m ₄ is 0, a mode for detecting projection light onto the subject (processing of the projection light suppression unit 6-2) is performed, and the shadow region correction unit 5-2 performs feedback correction of the shadow region.

Based on the above, the brightness correction of the projector 7-1 when m ₁ is determined to be 0 as a result of the calculation according to Expression (12) will be described. If the main correction is determined (YES in step Sc3), the luminance of the original image is distributed to the projector 7-1 according to equation (2) (step Sc4). Next, it is determined whether or not the detection mode is set (step Sc5). In this case, since the detection mode is not set (NO in step Sc5), the distributed luminance is corrected in accordance with the formula (5), and the projector 7-1. the brightness _{P 1} for outputting the determined (step Sc6). Here, after holding the observation image for the processing of the projection light suppression unit 6-1, and outputs the corrected luminance P ₁ from the projector 7-1 (step Sc11). When this process is completed, it is determined whether or not all the processes are completed (step Sc12). If not, the process returns to the standby state of step Sc1 to receive the next frame number.

Next, feedback correction of the projector 7-1 when m ₂ is determined to be 0 will be described. In this case, since the observation image is used, the observation image is read through the frame management unit 3, and the luminance difference ΔC of each pixel between the image C ′ and the original image C is obtained by Expression (8) (step Sc9). . Furthermore, since the detection mode (YES in step Sc5), the feedback correction using the equation (9), again corrects the brightness _{P 1} (step Sc10). Then, it outputs the corrected luminance _{P 1} from the projector 7-1 (step Sc11). When this process is completed, it is determined whether or not all the processes are completed (step Sc12). If not, the process returns to the standby state of step Sc1 to receive the next frame number.

On the other hand, it is determined in frame determination, m1, or _{while m 2} is determined to 0, the projector 7-2 and the sub corrected (NO in step Sc3). After this determination, the luminance of the original image is distributed to the projector 7-2 according to Equation (3) (Step Sc7). The distributed brightness corrected according to Equation (6), obtains the luminance _{P 2} for output from the projector 7-2 (step Sc8). Corrected luminance _{P 2} is output from the projector 7-2 (step S11). When this process is completed, it is determined whether or not all the processes are completed (step Sc12). If not, the process returns to the standby state of step Sc1 to receive the next frame number.

Next, luminance correction of the projector 7-2 when m ₃ is determined to be 0 as a result of calculation according to Expression (13) will be described. When the main correction is determined, the luminance of the original image is distributed to the projector 7-2 according to Equation (3) (step Sc4: where γ ₂ > γ ₁ ). In this case, since no detection mode (NO in step Sc5), the distributed brightness corrected according to Equation (6), obtains the luminance _{P 2} for output from the projector 7-2 (step Sc6). Here, after holding the observation image for the processing of the projection light suppression unit 6-2, and outputs the corrected luminance P ₂ from the projector 7-2 (step Sc11). When this process is completed, it is determined whether or not all the processes are completed (step Sc12). If not, the process returns to the standby state of step Sc1 to receive the next frame number.

Next, feedback correction of the projector 7-2 when m ₄ is determined to be 0 will be described. In this case, since the observation image is used, the observation image is read through the frame management unit 3, and the luminance difference ΔC of each pixel between the image C ′ and the original image C is obtained by Expression (8) (step Sc9). . Furthermore, in this case, since the detection mode (YES in step Sc5), the feedback correction, again corrects the luminance _{P 2} using the equation (10) (step Sc10). Corrected luminance _{P 2} is output from the projector 7-2 (step Sc11). When this process is completed, it is determined whether or not all the processes are completed (step Sc12). If not, the process returns to the standby state of step Sc1 to receive the next frame number.

On the other hand, while m ₃ or m ₄ is determined to be 0 in the frame determination, the projector 7-1 is determined to be sub-correction (NO in step Sc3). After this determination, the luminance of the original image is distributed to the projector 7-1 according to Equation (2) (step Sc7: where γ ₂ > γ ₁ ). The distributed brightness corrected according to Equation (5), obtains the brightness _{P 1} for output from the projector 7-1 (step Sc8). Corrected luminance _{P 1} is output from the projector 7-1. When this process is completed, it is determined whether or not all the processes have been completed (step Sc12). If not, the process returns to the standby state in order to receive the next frame number.

FIG. 5 is a flowchart for explaining the operation of the projection light suppression units 6-1 and 6-2 according to the first embodiment. In the frame determination, when m ₂ or m ₄ is determined to be 0, the processing of the projection light suppression units 6-1 and 6-2 is executed. Since this process is similarly performed in the projector 7-1 and the projector 7-2, the process of the projection light suppressing unit 6-1 for the projector 7-1 will be described below.

The projection light suppression units 6-1 and 6-2 are in a standby state in the initial state and wait for reception of a frame number (step Sd1). Then, when the frame number is received from the frame management unit 3, the projection light suppression units 6-1 and 6-2 perform frame determination (step Sd2). Next, it is determined whether or not the detection mode is set according to the frame determination result (step Sd3). This determination is linked with the detection mode of FIG. 4. When the detection mode of FIG. 4 is determined to be “YES”, the detection mode of FIG. 5 is also determined to be “YES”. In the frame determination, when m ₂ is 0, an image obtained by photographing the current screen is observed.

On the other hand, in the frame determination, when m ₁ is 0, the detection mode is determined (YES in step Sd3), and the previous observation image is held and read (step Sd4). Is detected (step Sd5). In the detection of a change in luminance, a difference in luminance value is calculated in order for each pixel between images, and when the difference exceeds an allowable value, a pixel whose luminance has changed greatly is detected.

  Next, the subject area is determined (step Sd6). In the determination of the subject area, if the luminance change changes significantly, the pixel determines that the subject is not exposed to projection light. Conversely, the difference does not exceed the allowable value, and the luminance hardly changes. In this case, it is determined that the projection light from the pixel is hitting the subject (because the subject hits the light, the corrected luminance has not reached the screen). Since the output luminance from the projector 7-2 is fixed to be low, the determination of whether the projection light from the projector 7-1 hits the subject can be smoothly processed in the determination of the subject area.

  Next, a mask image is generated (step Sd7). In the generation of the mask image, a mask image is generated in which the mask value of a pixel determined to hit the subject is set to 0, and the mask value of a pixel that is not so is set to 1. In the mask image, when the mask value is 1, the corrected luminance is output from the projectors 7-1 and 7-2, and when the mask value is 0, the corrected luminance is output from the projectors 7-1 and 7-2. 0.

  Next, the projection light is suppressed (step Sd8). In the suppression of the projection light, the corrected luminance value is multiplied by the pixel value (0 or 1) of the mask image and output from the projectors 7-1 and 7-2 to suppress the projection light on the subject. Then, it is determined whether or not the process is completed (step Sd9). If the process is not completed, the process returns to step Sd1 and the above-described process is repeated. On the other hand, when all the processes are completed, the processes are terminated.

B. Second Embodiment Next, a second embodiment of the present invention will be described.
The process of the first embodiment is a method of alternately correcting the brightness of the two projectors 7-1 and 7-2. In contrast, the second embodiment is an extension of the present invention in a multi-projector system composed of three or more projectors.

  FIG. 6 is a block diagram showing a configuration of a multiple projection control apparatus using N projectors according to the second embodiment. It should be noted that portions corresponding to those in FIG. 6, in the second embodiment, the camera 1, the image input unit 2, the frame management unit 3, the content DB 4, the shadow area correction units 5-1 to 5-N, and the projection light suppression units 6-1 to 6-N. , N projectors 7-1 to 7-N are provided.

  The principle is the same as in the first embodiment, but the luminance correction and feedback correction are performed on the projectors one by one in accordance with the point that the luminance of the original image is distributed to the N projectors and the frame determination. The difference is that this process is performed. Only the difference will be described below.

In the frame determination, when the frame numbers are # 1 and # 2, the projector 7-1 is the main correction target, and when the frame numbers are # 3 and # 4, the projector 7-2 is the main correction target. When the frame numbers are # 2k-1 and # 2k, the projector 7-k is the main correction target. When the frame numbers are # 2N-1 and 2N, the projector 7-N is the main correction target. As determined, the following equation (14) is calculated, and if m _2k−1 or m _2k is 0, the projector 7-k is determined as the main correction target.

  Other projectors 7-j (≠ k), j = 1, 2,..., N are determined to be sub-corrections. After the frame determination, the luminance value C of the original image is distributed as shown in the following equation (15).

Here, the coefficient of the projector 7-k that is the main correction target is γ _k > γ _j , (j = 1, 2,..., N, j ≠ k).

When m _2k−1 is 0, all the projectors 7-1 to 7-N correct the luminance as shown in the following equation (16) according to the luminance distribution. When m _2k is 0, the frame management unit 3, the observed image is read out, the luminance difference of each pixel between the image C ′ and the original image C is obtained by Expression (8), and by feedback correction, as shown in the following Expression (17), the projector 7 again correcting luminance _{P 1} of -k. At this time, the projection light suppression unit 6-k detects the subject, generates a mask image, and suppresses the projection light on the subject.

  In accordance with the frame determination, the projectors 7-1 to 7-1 are sequentially corrected while the brightness C observed by the camera 1 satisfies the condition expressed by the following equation (18), while correcting the brightness from the projectors 7-1 to 7-N. When the projection light from 7-N illuminates the subject, the process of suppressing the light is repeated.

  In the present invention, a storage medium storing software program codes for realizing the functions of the first and second embodiments described above is supplied to a system or apparatus, and the CPU (MPU) of the system or apparatus is provided. It can also be realized by reading and executing the program code stored in the storage medium. In that case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and a storage medium storing the program code, for example, a CD-ROM, a DVD-ROM, a CD-R. , CD-RW, MO, HDD, etc. constitute the present invention.

1 Camera 2 Image input unit 3 Frame management unit 4 Content DB
5-1 to 5-N Shadow area correction unit 6-1 to 6-N Projection light suppression unit 7-1 to 7-N Projector

Claims (3)

Multiple projectors that project a single image onto the screen at different angles;
Imaging means for imaging an image projected on the screen;
Frame management means for managing frame numbers of images taken by the imaging means;
A plurality of shadow area correction means for correcting the luminance in the shadow area generated on the screen by an object existing in front of the screen for each corresponding projector based on the frame number managed by the frame management means;
A plurality of projection light suppressing means for suppressing the projection light of the corresponding projector so that the projection light from the corresponding projector does not illuminate the object in synchronization with each of the plurality of shadow area correction means. A multiple projection control device characterized by the above. A multiple projection control method comprising:
An imaging step of imaging one image projected on a screen by a plurality of projectors with a camera;
A frame management step for managing a frame number of an image captured by the camera;
Based on the frame number managed in the frame management step, for each corresponding projector, a shadow area correction step for correcting the luminance in the shadow area generated on the screen by an object existing in front of the screen;
And a projection light suppression step of suppressing the projection light of the corresponding projector so that the projection light from the corresponding projector does not illuminate the object in synchronization with the shadow area correction step. Control method. In the computer of the multiple projection control device,
An imaging function for imaging one image projected on a screen by a plurality of projectors with a camera;
A frame management function for managing the frame number of an image captured by the camera;
A shadow area correction function for correcting the brightness in the shadow area generated on the screen by an object existing in front of the screen for each corresponding projector based on the frame number managed by the frame management function;
A multiple projection that performs a projection light suppression function that suppresses the projection light of the corresponding projector so that the projection light from the corresponding projector does not illuminate the object in synchronization with the shadow area correction function Control program.

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