JP2015186125A - multi-projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an original image with resolution which can be projected using a plurality of projectors to be projected without a black region.SOLUTION: A multi-projection system includes: image processing means for generating an output image by performing image processing for an input original image; output control means for projecting the output image to a projection surface; communication processing means used for communicating control information on a plurality of projectors; and control means for performing control of the whole multi-projection system. The control means comprises: effective pixel region calculation means for detecting an effective pixel region of the original image; system constitution management means for detecting the number of projectors forming the system and a projection possible region of the projectors; image processing instruction means for instructing the image processing means to perform edge blend and scaling processing; and projection size determination means that allocates partial regions of the original image to the projectors by allowing overlapping, notifies the image processing instruction means of each projector, and transmits a signal used for output control of each projector.

Description

  The present invention relates to a multi-projection system, and more particularly to a technique suitable for use in projecting and displaying one image with a plurality of projectors.

  In recent years, with the diversification of video input / output devices, the opportunity to view video with a resolution different from the input video is increasing. For high-resolution video that exceeds the maximum resolution of the video output device, a method of displaying a partial region of the input video using a plurality of video output devices is known.

When projecting images using multiple video output devices (hereinafter referred to as projectors), if there is a black area within the projection area of the projector, the projector light is also projected into the black area, which is compared with the non-projection area. As a result, a bright area is generated. Patent Document 1 discloses a multi-projection display using a method for suppressing the occurrence of a black floating pattern that occurs when an image is displayed using a plurality of projectors.
More specifically, the multi-projection display of Patent Document 1 is configured such that projection light from at least two projector units is superimposed and projected at any point in the entire projection area of the multi-projection display. Of the at least two projector units described above, at least one projector unit projects the projection light with the pixel value adjusted so as to suppress the occurrence of the “black floating pattern” onto the projection surface. .

Japanese Patent Laid-Open No. 2005-286772

However, the multi-projection display proposed in Patent Document 1 has a problem that a bright black region is generated as compared with a non-projection region.
An object of the present invention is to make the difference between a black region of an image and a region where no image is projected inconspicuous when an image is projected using a plurality of projectors.

  The multi-projection system of the present invention has the following configuration, for example. That is, a multi-projection system that displays a large image on a projection surface by projecting an input original image from a plurality of projectors, a video signal input means for receiving the original image, and the input original image Image processing means for generating an output image by performing image processing, output control means for projecting the output image generated by the image processing means on the projection plane, and communication processing means used for communication of control information of a plurality of projectors And a control means for controlling the entire multi-projection system, wherein the control means is an effective pixel area calculating means for detecting an effective pixel area of the original image, the number of projectors constituting the system, and a projector capable of projecting System configuration management means for detecting an area, and edge blending and scaling processing in the image processing means. Image processing instruction means for instructing and assigning a partial area of the original image to the projector for superimposition, notifying the image processing instruction means of each projector, and sending a signal used for output control of each projector Means.

  According to the present invention, when an image is projected using a plurality of projectors, the difference between the black area of the image and the area where no image is projected can be made inconspicuous.

It is a block diagram which shows the structural example of the multi-projection system in embodiment of this invention. It is a projection schematic diagram explaining a mode at the time of displaying an effective pixel area of an input picture using a multi-projection system. It is a flowchart explaining the procedure of the update process of the structure information of a projector. It is a figure which shows the structure management table of a projector. It is a flowchart explaining the process sequence in which a projection size determination part determines a projection area. It is a figure which shows the example of a partial area division at the time of projecting an image. It is a figure which shows the structural example of the partial area information corresponding to a division | segmentation.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, for simplification of description, a multi-projection system configured using four projectors having the same projection resolution will be described, but it may be configured by an arbitrary number of two or more. The projection resolution supported by each projector may be different.

The multi-projection system 200 according to the embodiment of the present invention receives a video signal input from an external storage device or a network, and converts the input video signal into pixel information.
FIG. 2 shows a schematic diagram when the effective pixel area of the input video is displayed using the multi-projection system of the present embodiment. In FIG. 2, the entire effective pixel area 205 is projected by projecting partial areas obtained by dividing the effective pixel area 205 into four parts on the projection plane using the four projectors 201, 202, 203, and 204. doing.

  Cables 206, 207, and 208 are control information bidirectional transmission paths that connect the projector 201 that performs control processing of the projector system and the projectors 202 to 204. A cable 209 is used as a transmission path for video input to the multi-projection system.

FIG. 1 is a block diagram showing a main part of the multi-projection system 200.
The projector 201 controls the entire multi-projection system. The projector 201 includes a video signal input unit 102, an image processing unit 103, an output control unit 104, a projection lens 105, a control unit 107, and a communication processing unit 110.

  The video signal input unit 102 has a video signal input terminal (not shown). The image processing unit 103 processes the input video signal. The output control unit 104 controls an optical device that outputs a video signal. The projection lens 105 projects an image. The communication processing unit 110 is used for communication of control information of each projector.

  The control unit 107, the image processing unit 103, and the communication processing unit 110 are connected to the system memory 106 by a system bus. The control unit 107 includes a CPU, and controls each unit of the projector by a program stored in the system memory 106 or a memory included in the control unit 107 (not shown).

The control unit 107 of the projector 201 includes an effective pixel area calculation unit 111, an image processing instruction unit 108, a projection size determination unit 109, a system configuration management unit 112, and a state management unit 113.
The effective pixel area calculation unit 111 acquires the effective pixel area of the original image input from the video signal input unit 102 from the image processing unit 103.

The image processing instruction unit 108 controls the image processing unit 103.
The projection size determination unit 109 determines the projection area of each projector 201 to 204.
The system configuration management unit 112 manages the specifications and connection status of each projector.
The state management unit 113 responds to a change in the state of video input / output and an inquiry about a compatible format of the projector.

  Each of the projector 202, the projector 203, and the projector 204 includes a video signal input unit 122, an image processing unit 123, an output control unit 124, a projection lens 125, a control unit 127, a communication processing unit 130, and a system memory 126. The control unit 127 operates as the image processing instruction unit 128 and the state management unit 131.

  A video signal input to the multi-projection system 200 via the cable 209 is input to the image processing unit via the video signal input unit 102. If the input video signal is an analog signal, the image processing unit performs A / D conversion to convert it into a digital signal.

  The image processing unit 103 analyzes the video input signal at the timing indicated by the effective pixel area calculation unit 111 and detects the effective pixel area of the input video. The effective pixel area calculation unit 111 defines an effective pixel area from the resolution and color information of the original image, and notifies the projection size determination unit 109 of the effective pixel area of the original image.

The projection size determining unit 109 of the projector 201 divides the input video into partial areas projected by each projector according to the effective pixel area of the input video and the resolution that the projectors 201, 202, 203, and 204 can project.
The projection size determination unit 109 notifies the image processing instruction unit 108 of the definition information of the partial area projected by the projector 201.
The definition information of the partial areas projected by the projectors 202, 203, and 204 is transmitted from the communication processing unit 110 of the projector 201 to the communication processing unit 130 of each projector. The image processing instruction unit 128 receives partial area definition information from the communication processing unit 130.

  As the definition information of the partial area, the present embodiment uses a format in which the area information includes the position information of the overlapping area of the projected image between a plurality of projectors and the luminance value for each area included in the overlapping area. Based on the partial region definition information, the image processing instruction units 108 and 128 instruct the image processing units 103 and 123 to perform edge blending and scaling processing. Edge blending is a method of projecting the edges of images superimposed on each other when composing images projected by a plurality of projectors as one image.

  The partial areas processed by the image processing units 103 and 123 are transferred to the output control units 104 and 124 and projected by the projection lenses 105 and 125, respectively. The output control units 104 and 124 perform lens shift control, brightness correction, and color correction, and project an image.

  The projection size determining unit 109 refers to configuration information such as the projectable resolution and the projection luminance of each projector in order to determine the partial area projected by each projector. In this embodiment, the configuration information is managed using the configuration management table shown in FIG. The configuration management table includes a projector number 401 used for projector identification, the number of projectable resolutions 402 of each projector, a projectable resolution 403, and a projector availability flag 404.

  Although not used in the present embodiment, the contrast ratio and the luminance value may be given as the configuration information, and correction may be performed so that the image contrast and the luminance value are uniform among the projectors. Also, the projector may have an input video format corresponding to each projector as configuration information, and projectors that do not support the input video format may be excluded from the partial area allocation targets.

  The system configuration management unit 112 updates the configuration management table when the specifications of the projector included in the system are changed or when the projector fails. For the projectors 202 to 204, the system configuration management unit 112 makes an inquiry to the state management unit 131 via the communication processing unit 110 and the communication processing unit 130, and acquires configuration information.

FIG. 3 is a flowchart for explaining a procedure for updating the projector configuration information by the system configuration management unit 112.
In S301, the system configuration management unit 112 determines whether or not configuration information needs to be updated. If no update is required, the process ends.
In S302, the system configuration management unit 112 prohibits new partial area allocation processing until the update of the configuration management table in S307 is completed.

In step S303, the system configuration management unit 112 selects one projector whose status inquiry has not been completed.
In S304, the system configuration management unit 112 inquires of the state management unit 131 of the projector 202 about items included in the configuration information table of FIG.

In step S <b> 305, the system configuration management unit 112 receives the configuration information of the projector 202 from the state management unit 131.
In S306, the system configuration management unit 112 registers the configuration information received from the state management unit 131 in the configuration management table.

S303 to S306 are repeated for the projectors 203 and 204.
When the inquiry to all the projectors included in the multi-projection system 200 is completed in S303, the prohibition of partial area assignment is canceled in S307, and the configuration management table is updated.

FIG. 4 shows a configuration management table in the case where the projectors 201 to 204 have two projection resolutions of 1920 × 1080 and 1600 × 1200, respectively.
The projectors 201, 202, 203, and 204 included in the multi-projection system of the present embodiment are assigned values 0 to 3 as projector numbers 401, respectively. In this embodiment, since the projectors 201, 202, 203, and 204 have a projectable resolution of 1920x1080 and 1600x1200, the projectable resolution number 402 is 2, and the projectable resolution 403 is two of 1920x1080 and 1600x1200. Here, it is assumed that all the availability flags 404 of the projector are usable.

  A change in the effective pixel area of the original image is detected by the effective pixel area calculation unit 111. When the effective pixel area is changed, the effective pixel area is re-acquired from the image processing unit 103, and the changed resolution is notified to the projection size determining unit 109.

FIG. 5 is a flowchart for explaining a processing procedure for the projection size determination unit 109 to determine the projection area.
In step S <b> 500, the projection size determination unit 109 inquires of the system configuration management unit 112 whether the partial area can be allocated. When the system configuration management unit 112 is updating the configuration management table, it waits for the configuration management table to be updated.

  In S501, the effective pixel area calculation unit 111 detects whether there is a change in the effective pixel area of the original image (input image). When a change in the input image resolution is detected, the projection size determination unit 109 assigns a partial area to the projector included in the configuration management table 400 according to the changed resolution in S502.

In step S503, it is determined whether the sum of the resolutions that can be projected by all projectors is higher than the resolution of the original image. When the sum of the resolutions that can be projected is higher than the resolution of the original image, the process proceeds to S504, and a partial area to be allocated to each projector is calculated from the resolution of the original image.
In S503, if the sum of the projectable resolutions (maximum area) of all projectors is lower than the resolution of the original image, the process proceeds to S505, the original image is reduced and scaled while maintaining the aspect ratio, and the coefficients used for scaling the original image And obtain the scaled resolution. Then, it progresses to S509.

  In S504, it is determined whether the minimum projectable resolution of the projector included in the multi-projection system is higher than the original image resolution. If the minimum projectable resolution of the projector is higher than the original image resolution, the process proceeds to S506. In S506, when the minimum projectable area of all the projectors is larger than the effective pixel area, enlargement scaling processing is performed on the original image. At this time, enlargement scaling processing is performed so that the original image resolution is equal to or higher than the minimum resolution that can be projected by one projector while maintaining the aspect ratio of the original image, and the coefficients used for scaling the original image and the scaled resolution are obtained. Thereafter, the process proceeds to S507.

  In step S507, it is determined whether the image resolution that can be projected by any projector included in the configuration management table is equal to the output image resolution. If equal, the image is projected by one projector. At this time, non-projection is instructed to the projector not in use in S508. In S507, when the projection resolution of each projector is different from the resolution of the output image, projection is performed using a plurality of projectors.

In S509, when the original image is horizontally long, a configuration closest to the resolution of the output image is selected from the arrangement in which the projection area of the projector included in the multi-projection system is horizontally long, and the partial projection area of each projector is obtained.
When the original image is vertically long, a configuration closest to the resolution of the output image is selected from an arrangement in which the projection area of the projector included in the multi-projection system is horizontally long, and the partial projection area of each projector is obtained.

In S510, it is determined whether the maximum resolution that can be projected with the selected configuration is equal to the output image resolution. If equal, there is no overlapping area, so a partial area is assigned to each projector without overlapping. In step S511, it is determined whether or not all projectors included in the multi-projection system are used for projection. If so, the process proceeds to S513.
If all the projectors included in the multi-projection system are not used for projection in S511, the surplus projectors are instructed not to project in S508.

If the maximum resolution that can be projected with the configuration selected in S509 is different from the aspect ratio of the output image resolution, an area in which the projected image of the projector is superimposed is generated. In S512, each projector superimposed area is calculated.
When the calculation of the partial area, the overlapping area, and the scaling coefficient is completed, the partial area information is sent to the projectors 202, 203, and 204 in the multi-projection system using the communication processing unit 110 in S513, and the partial area allocation process is performed. Exit.

Hereinafter, allocation of partial areas to each projector will be described.
Consider a case in which an output image resolution (Xdisp, Ydisp) is projected using a multi-projection system having a projection resolution of (Xprj, Yprj) and vertical and horizontal Xp x Yp projectors. The upper left of the output image area is the partial area (Px, Py) = (0,0), the upper right is (Xp-1,0), the lower right is (0, Yp-1), the lower right is (Xp-1, Yp In the case of -1), an example of partial area allocation to each projector included in the multi-projection system is shown below.
Xprj x (n-1) <Xdisp <= Xprj xn
If Yprj x (m-1) <Ydisp <= Yprj xm
The output image can be projected with n projectors in the X direction and m projectors in the Y direction.

If the superimposition area is 0 <= i <(n-1), 0 <= j <(m-1),
Xprj xn-Xdisp pixels in the partial area where (Px, Py) = (0, i), (1, i)
In a partial region where (Px, Py) = (j, 0), (j, 1), Yprj xm-Ydisp pixels are obtained. Projection off is instructed to redundant projectors (Xp-n) x (Yp-m) that do not require projection.

A multi-projection system is configured by using a multi-projection system including four projectors having a projectable resolution of 1600 × 1200 and 1920 × 1080. When a 3000x2000 original image is displayed, the sum of the projectable areas of all projectors is as follows.
For resolution 1600x1200: 1600x1200x4 pixels For resolution 1920x1080: 1920x1080x4 pixels

Since the aspect ratio of the original image is 3: 2, the resolution of each projector is selected to be 1600x1200 with a close aspect ratio.
Since the projectable area of each projector is 1600 × 1200 pixels for an original image resolution of 3000 × 2000 pixels, the number of projectors n that project in the X direction and the number of projectors m that project in the Y direction are two, respectively.
When n = 2 and m = 2, the maximum projectable resolution is 3200 × 2400 pixels.

FIG. 6 shows an example of partial area division when an image of 3000 × 2000 pixels is projected by the multi-projection system of the present embodiment.
In the present embodiment, the partial area 1, the partial area 2, the partial area 3, and the partial area 4 are allocated to the four projectors 201, 202, 203, and 204 included in the multi-projection system, respectively.

The partial area 1 includes areas 601, 602, 608, and 610.
The partial area 2 includes areas 602, 603, 604, and 610.
The partial area 3 includes areas 606, 607, 608, and 610.
The partial area 4 includes areas 604, 605, 606, and 610.
In FIG. 6, areas 602, 604, 606, and 608 are areas that are projected by two projectors, and area 610 is an area that is projected by four projectors.

7A and 7B show a configuration example of partial area information corresponding to the above-described division.
In FIG. 7A, the partial area information 700 has a projector number 701, a projection area number 702 that is an identification number of a projection area assigned to each projector, and a scaling coefficient 703 for each partial area. Furthermore, the number of overlapping areas 704 indicating the number of overlapping areas, the overlapping area start coordinates 705, the overlapping area size 706, and the number of overlapping area surfaces 707 that hold the number of overlapping surfaces in each overlapping area are provided.

In the 3000x2000 pixel projection example,
The number of pixels in the overlap area in the X direction is
(Xprj xi-Xdisp) = 1600x2-3000 = 200
The number of pixels in the overlap area in the Y direction is
(Yprj xi-Ydisp) = 1200x2-2000 = 400

A value of 0 to 3 is assigned as the projector number 701 to the projector 201, the projector 202, the projector 203, and the projector 204.
Next, projection areas 1 to 4 are assigned as partial areas to be projected by each projector and recorded in projection area number 702. Since scaling is not necessary in this embodiment, the scaling coefficient 703 is 1 in all areas. In the present embodiment, each of the projection areas 1 to 4 has an overlapping area of 200 pixels in the X direction and 400 pixels in the Y direction.

  The projection area 1 has three overlapping areas, areas 602 and 608 and an area 610. Similarly, the projection area 2 has three overlapping areas of areas 602, 604 and 610, the projection area 3 has three overlapping areas of areas 606, 608 and 610, and the projection area 4 has areas 604, 606 and an area. 610 has three overlapping areas. From the above, the number of overlapping regions 704 is all three.

The overlapping regions included in the partial region 1 are regions 602, 608, and 610. In order to represent these areas, in the present embodiment, the upper left coordinate of the overlap area in each partial area is used as the overlap area start coordinate 705 and the number of vertical and horizontal pixels in each area is used as the overlap area size 706.
The overlapping region start coordinates of the partial region 1 are calculated using the coordinates (X, Y) = (0, 0) of the entire region 609 as the origin.

The superimposition area start coordinates of the area 602 are (X, Y) = (1400,0), the superimposition area start coordinates (X, Y) = (0,800) of the area 608, and the superposition area start coordinates of the area 610 are (X, Y ) = (1400,800).
The overlapping area sizes of the areas 602, 608, and 610 are respectively
(X, Y) = (200,800), (X, Y) = (1400,400), (X, Y) = (200,400).

  The number of surfaces on which projection images are superimposed in each region is 2 for regions 602 and 608 and 4 for region 610. As a result, the number of overlapped area surfaces 707 is 2 in the areas 602 and 608 and 4 in the area 610.

Overlapping areas included in the partial area 2 are areas 602, 604, and 610. The overlapping region start coordinates of the partial region 2 are calculated using the coordinates (X, Y) = (1400, 0) of the entire region 609 as the origin.
The superimposition area start coordinates of the area 602 are (X, Y) = (0, 0), the superimposition area start coordinates (X, Y) = (200, 800) of the area 604, and the superposition area start coordinates of the area 610 are (X , Y) = (0,800).
The overlapping area sizes of the areas 602, 604, and 610 are (X, Y) = (200, 800), (X, Y) = (1400, 400), and (X, Y) = (200, 400), respectively.

  The number of surfaces on which projection images overlap in each region is 2 for regions 602 and 604 and 4 for region 610. As a result, the number of overlapped area surfaces 707 is 2 in the areas 602 and 604 and 4 in the area 610.

Overlapping areas included in the partial area 3 are areas 608, 610, and 606. The overlapping area start coordinates of the partial area 3 are calculated using the coordinates (X, Y) = (0,800) of the entire area 609 as the origin.
The superimposition area start coordinates of the area 608 are (X, Y) = (0, 0), the superimposition area start coordinates (X, Y) = (1400, 0) of the area 610, and the superposition area start coordinates of the area 606 are (X , Y) = (1400,400).

The overlapping area sizes of the areas 608, 610, and 606 are (X, Y) = (1400,400), (X, Y) = (200,400), and (X, Y) = (200,800), respectively.
The number of surfaces on which projection images overlap in each region is 2 for regions 608 and 606 and 4 for region 610. As a result, the number of overlapped area surfaces 707 is 2 in the areas 608 and 606 and 4 in the area 610.

Overlapping areas included in the partial area 4 are areas 604, 610, and 606. The overlapping region start coordinates of the partial region 4 are calculated using the coordinates (X, Y) = (1400,800) of the entire region 609 as the origin.
The superimposition area start coordinates of the area 604 are (X, Y) = (200, 0), the superimposition area start coordinates (X, Y) = (0, 0) of the area 610, and the superimposition area start coordinates of the area 606 are (X , Y) = (0,400).

The overlapping area sizes of the areas 604, 610, and 606 are (X, Y) = (1400,400), (X, Y) = (200,400), and (X, Y) = (200,800), respectively.
The number of surfaces on which the projected images overlap in each region is 2 for regions 604 and 606 and 4 for region 610. As a result, the number of overlapping area surfaces 707 is 2 in the areas 604 and 606 and 4 in the area 610.

  As described above, when the generation of the partial area information table is completed, the projection size determining unit 109 transmits the partial area information 711 to the projector 202, the partial area information 712 to the projector 203, and the partial area information 713 to the projector 204, respectively. Also, the partial area information 710 is notified to the image processing instruction unit 108 of the projector 201.

  The image processing instruction unit of each projector notifies the projection size determination unit 109 that partial area information has been received. When the projection size determination unit 109 receives a reception notification of partial area information from the image processing instruction unit of all projectors, the projection size determination unit 109 sends a signal for switching the projection size to all projectors.

The image processing instruction unit of each projector instructs the image processing unit to perform scaling specified by the scaling coefficient 703. In addition, for each area defined by the overlapping area start coordinates 705 and the overlapping area size 706, a luminance adjustment instruction is issued according to the reciprocal number of the overlapping area surface number 707. That is, the image processing unit changes the luminance of the input video signal in accordance with an instruction from the image processing instruction unit so that the luminance of the overlapping region where the projection regions of the plurality of projectors overlap is lowered. More specifically, the luminance of the input video signal is changed so that the luminance decreases as the number of overlapping area surfaces increases.
As a result, the difference between the black area of the image and the area where no image is projected can be made inconspicuous in the original image having a resolution that can be projected by the multi-projection system.

[Second Embodiment]
In the present embodiment, a multi-projection system is configured using a multi-projection system including four projectors having projector-projectable resolutions of 1600 × 1200 and 1920 × 1080. Then, partial area calculation when displaying a 1300 × 675 original image will be described.

The resolution of each projector is selected as 1920x1080 with a similar aspect ratio. However, since the input resolution is smaller than the projectable resolution, scaling is performed so that the Y direction becomes 1080 pixels. Here, the scaling factor is 1080/675 = 1.6. At this time, the X direction is 1300 × 1.6 = 2080 pixels.
Since two projectors in the X direction and one projector in the Y direction can be projected, the projection area is two areas. The size of the overlapping area is (1920x2-2080) = (1920x2-2080) = 1760 pixels in the X direction.

As shown in FIG. 7B, since the projector 2 and the projector 3 do not require projection, the projection area is set to zero.
In the present embodiment, since it is configured as described above, an original image with an arbitrary resolution can be projected in a region that can be projected by the multi-projection system without blackening.

[Third Embodiment]
In the above-described embodiment, the projector 201 controls the projectors 202, 203, and 204 to perform control processing of the projector system.
However, a control unit that performs control processing of the projector system, specifically, the projection size determination unit 109, the effective pixel area calculation unit 111, and the system configuration management unit 112 may be provided in a control unit outside the projector 201.

  When configured as described above, the control unit 107 of the projector 201 includes the image processing instruction unit 108 and the state management unit 113 in the same manner as the projectors 202, 203, and 204.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (computer program) that implements the functions of the above-described embodiments is supplied to a system or apparatus via a network or various computer-readable storage media. Then, the computer (or CPU, MPU, etc.) of the system or apparatus reads out and executes the program.

102 video signal input unit 103 image processing unit 104 output control unit 105 projection lens 106 system memory 107 control unit 108 image processing instruction unit 109 projection size determination unit 110 communication processing unit 111 effective pixel area calculation unit 112 system configuration management unit 113 state Management unit 122 Video signal input unit 123 Image processing unit 124 Output control unit 125 Projection lens 126 System memory 127 Control unit 128 Image processing instruction unit 130 Communication processing unit 131 Status management unit

Claims (6)

A multi-projection system that displays a large image on a projection surface by projecting an input original image from a plurality of projectors,
Video signal input means for receiving the original image;
Image processing means for processing the input original image to generate an output image;
Output control means for projecting the output image generated by the image processing means onto the projection plane;
Communication processing means used for communication of control information of a plurality of projectors;
Control means for controlling the entire multi-projection system,
The control means includes
Effective pixel area calculating means for detecting an effective pixel area of the original image;
A system configuration management means for detecting the number of projectors constituting the system, a projectable area of the projector, and
Image processing instruction means for instructing the image processing means to perform edge blending and scaling processing;
Projection size determining means for assigning the partial area of the original image to the plurality of projectors so as to be superimposed, notifying the image processing instruction means of each projector, and transmitting a signal used for output control of each projector. Multi-projection system.   2. The multi-value according to claim 1, wherein the effective pixel area calculating unit defines an effective pixel area from the resolution of the input original image, and notifies the effective size of the original image to the projection size determining unit. Projection system.   3. The projection size determining means divides the original image into partial areas projected by the projectors according to the effective pixel area of the original image and the resolution that each projector can project. The multi-projection system described.   The image processing instruction unit instructs the image processing unit to perform a reduction scaling process on an original image when a maximum area that can be projected by all projectors is smaller than an effective pixel area. The multi-projection system according to any one of the above.   4. The image processing instruction unit according to claim 1, wherein the image processing instruction unit instructs the image processing unit to perform an enlargement scaling process on an original image when a minimum projectable area of all projectors is larger than an effective pixel area. The multi-projection system according to any one of the above. The effective pixel area calculating means calculates a scaling coefficient for the original image;
The projection size determining means sends the scaling coefficient to each image processing instruction means,
The multi-projection system according to claim 1, wherein the image processing instruction unit instructs the image processing unit to perform scaling according to the scaling coefficient.

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