JP2024171090A - CONTROL DEVICE, IMAGE PROJECTION SYSTEM, IMAGE PROJECTION DEVICE, CONTROL METHOD, AND PROGRAM - Google Patents

Abstract

To provide a projection control apparatus capable of simply adjusting a multi-projection system after replacing partial projectors in the multi-projection system.SOLUTION: A control apparatus for controlling a plurality of image projection apparatuses comprises: a communication unit which performs communication with the plurality of image projection apparatuses and acquires multi-projection information on layout of multi-projection from the image projection apparatuses; and a setting unit which sets the largest number of pieces of multi-projection information among the multi-projection information acquired from the image projection apparatuses, to the image projection apparatuses.SELECTED DRAWING: Figure 1

Description

The present invention relates to a control device, an image projection system, an image projection device, a control method, and a program.

Multi-projection systems are known that use multiple projectors (image projection devices) to stitch together multiple projected images to project one large image (tile projection), or to overlay multiple projected images to project a bright image (stack projection). When installing a multi-projection system, operations such as adjusting the positions of the multiple projected images are complicated.

In order to make it easier for users to set up a multi-projection system, Patent Document 1 discloses a projection control device and a control method that allows the installation positions of multiple projection devices to be appropriately adjusted. In addition, Patent Document 2 discloses a control method for replacing a projector that is part of a multi-projection system and is no longer able to project due to a breakdown or deterioration.

JP 2020-88691 A JP 2019-193215 A

In the method of controlling a multi-projection system disclosed in Patent Document 2, the projector operating as the master sets up the projectors that will newly join the multi-projection system. Therefore, if the projector operating as the master breaks down or deteriorates and is no longer able to project, it is cumbersome to set up the new projectors that will newly join the multi-projection system.

The present invention aims to provide a projection control device that can easily adjust a multi-projection system after replacing some of the projectors in the multi-projection system.

The control device of the present invention is a control device that controls multiple image projection devices, and is characterized by having a communication unit that communicates with the multiple image projection devices and acquires multi-projection information related to the layout of multi-projection from the multiple image projection devices, and a setting unit that sets the largest amount of multi-projection information among the multi-projection information acquired from the multiple image projection devices to the multiple image projection devices.

The present invention provides a projection control device that can easily adjust a multi-projection system after replacing some of the projectors in the multi-projection system.

Block diagram of a multi-projection system according to a first embodiment. Block diagram of a projection control device according to a first embodiment. 1 is a block diagram of an image projection apparatus according to a first embodiment; Flowchart for the projection control device of the first embodiment FIG. 1 is a schematic diagram showing multi-projection information stored in an image projection device according to a first embodiment; FIG. 1 is a schematic diagram showing multi-projection information stored in a projection control device according to a first embodiment; FIG. 13 is a schematic diagram showing updated multi-projection information stored in the image projection device according to the first embodiment; FIG. 13 is a schematic diagram showing updated multi-projection information stored in the projection control device of the first embodiment; Block diagram of a multi-projection system according to a second embodiment. 10 is a block diagram of an image projection apparatus according to a second embodiment. Flowchart regarding the image projection device of the second embodiment FIG. 13 is a schematic diagram showing multi-projection information stored in an image projection device according to a second embodiment; FIG. 13 is a schematic diagram showing multi-projection information stored in an image projection device according to a second embodiment; FIG. 13 is a schematic diagram showing updated multi-projection information stored in the image projection device according to the second embodiment; FIG. 13 is a schematic diagram showing updated multi-projection information stored in the image projection device according to the second embodiment;

A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. Note that in each drawing, the same reference numbers are used for the same components, and duplicated descriptions will be omitted.

First Embodiment
A multi-projection system 1000 according to a first embodiment will be described with reference to the block diagram of Fig. 1. The multi-projection system 1000 according to the first embodiment has a plurality of projectors (image projection devices) PJ11, PJ12, PJ13, and PJ14, and a projection control device PC. The projectors PJ11, PJ12, PJ13, and PJ14 project images S11, S12, S13, and S14, respectively, onto a projection surface (such as a screen). The multi-projection system 1000 forms a multi-projection image (tile projection/stack projection) using images projected from the plurality of projectors.

For simplicity of explanation, the multi-projection system 1000 of the first embodiment has four projectors, but any number of projectors may be used to configure the multi-projection system of the present invention. In addition, the arrangement of the multi-projection images in the first embodiment is two rows and two columns, but it may be one row and four columns or another arrangement. Each of the images S11 to S14 projected from the projectors has an area (not shown) where it partially overlaps with an adjacent image. This makes it possible to make the seams between the projected images less noticeable.

The projectors PJ11 to PJ14 and the projection control device PC (hereinafter referred to as the control device) are connected via a network hub HUB. The projectors PJ11 to PJ14 are connected to a network and are configured to be controllable by the projection control device PC via the network. The network can be a LAN (Local Area Network), the Internet, a WAN (Wide Area Network), etc. The projection control device PC can communicate with the projectors PJ11 to PJ14 via the network hub HUB, and can send control commands and receive data stored in the projectors PJ11 to PJ14. The projection control device PC may also be equipped with a camera CAM (imaging device) that captures the multi-projection images projected onto the projection surface. The projection control device PC can adjust the movement and deformation of the images projected from the projectors PJ11 to PJ14 based on the captured images acquired from the camera CAM to form a multi-projection image on the screen (hereafter referred to as multi-projection image adjustment). After the multi-projection image adjustment, the projection control device PC and camera CAM can be removed.

(Regarding the projection control device)
The projection control device PC according to the first embodiment will be described with reference to the block diagram of Fig. 2. The projection control device PC includes an input unit 101, an MPU 102, a communication unit 103, a captured image input unit 104, a storage unit 105, and a display unit 106.

The input unit 101 is composed of switches, dials, buttons, a remote control receiver, etc. (not shown) that accept various inputs from the user. The MPU 102 performs operations based on the input signals input from the input unit 101. The communication unit 103 is an interface for communicating with the projectors PJ11 to PJ14. The MPU 102 can transmit control commands and receive data stored in the projectors PJ11 to PJ14 via the communication unit 103.

The captured image input unit 104 can acquire data of an image captured by the camera CAM. The acquired captured image data is output to the MPU 102. The MPU 102 functions as a comparison unit capable of comparing multi-projection information, which will be described later. A specific example of this will be explained in a flowchart, which will be described later. The MPU 102 also functions as a setting unit capable of adjusting the multi-projection screen based on the multi-projection information and the captured image by the camera CAM.

The storage unit 105 can store information related to multi-projection image adjustment (multi-projection information). The multi-projection information includes, for example, the following information: Information related to multi-projection formats such as tile projection, in which multiple projection images are arranged in multiple consecutive locations to form one large image, and stack projection, in which multiple display screens from multiple projectors are stacked in one location to form a bright screen. Information related to the arrangement of projection images on the projection surface in the case of tile projection. Information related to the number of overlapping projection images in the case of stack projection. Information related to the association between each projection image that forms the multi-projection image and multiple projectors. Information related to the blending amount that indicates the overlapping area between adjacent projection images in the case of tile projection. Other information related to multi-projection image adjustment may also be stored.

The display unit 106 is a graphical user interface (GUI) that can provide various displays to the user. For example, when the user adjusts a multi-projection image, an adjustment menu is displayed on the display unit 106, allowing the user to operate the input unit 101 while checking the display.

(Image projection devices/projectors)
The projectors PJ11 to PJ14 according to the first embodiment will be described with reference to the block diagram of Fig. 3. Since the projectors PJ11 to PJ14 are identical, the projector PJ11 will be described as a representative.

The image signal input unit 201 is an interface for inputting an image signal from the outside. The image signal input unit 201 converts the input image signal into a format that can be processed by the downstream image signal processing unit 202, and then outputs the image signal to the image signal processing unit 202.

The image signal processing unit 202 performs various image signal processing on the input image signal, such as edge blending correction for partially overlapping adjacent projected images during tile projection, brightness correction, contrast correction, color correction, geometric correction, and aspect ratio conversion. The image signal processing unit 202 outputs the processed image signal to the image display panel driving unit 203. The image display panel driving unit 203 drives the image display panel 204 based on the input image signal.

The image display panel 204 (image forming element) displays the image projected by the projector PJ. The image display panel 204 is composed of a liquid crystal panel (LCD: Liquid Crystal Display, or LCOS: Liquid Crystal On Silicon). The display unit 103 is composed of a light modulation element such as a digital micro-mirror device (DMD: Digital Micro-mirror Device).

The light source driving unit 205 drives the light source 207 based on a light source control signal from the MPU 206. The projector PJ11 irradiates the light emitted from the light source 207 onto the image display panel 204. The image light modulated by the image display panel 204 passes through the lens 208 and is projected onto the projection surface.

The zoom unit 209 can enlarge or reduce the projection image projected onto the projection surface by driving the projection lens 208. The MPU 206 can control the projection lens 208 by outputting a zoom control command to the zoom unit 209.

The lens shift unit 210 can move the projection lens 208 in a direction perpendicular to the optical axis. By moving the projection lens 208 with the lens shift unit 210, it is possible to adjust the projected image to shift horizontally and vertically.

The operation unit 211 is composed of switches, dials, buttons, a remote control light receiving unit, etc. (not shown) that accept various operations from the user. The MPU 206 performs operations based on operation signals input from the operation unit 211. The communication unit 212 is a communication interface for communicating with the projection control device PC. The MPU 206 transmits and receives various control commands and data via the communication unit 212. The memory unit 213 can store multi-projection information in the same way as the memory unit 105 of the projection control device PC.

(Flowchart of the projection control device)
A method of controlling the multi-projection system by the projection control device PC of the first embodiment will be described with reference to the flowchart of FIG.

When control of the multi-projection system is started, in step S101, it is determined whether or not the user has started multi-projection image adjustment via the input unit 101. If the start of multi-projection image adjustment is detected, the process proceeds to step S102, and if not, the process returns to step S101.

In step S102, communication unit 103 requests projectors PJ11 to PJ14 to transmit the multi-projection information that each of them stores. For example, it is assumed that projectors PJ11 to PJ14 store the multi-projection information shown in Figures 5(A) to (D). Here, it is assumed that projectors PJ11 and PJ13 store information regarding 2 rows x 2 columns of tile projection, projector PJ12 stores information regarding 1 row x 2 columns of tile projection, and projector PJ14 stores information regarding two stack projections.

In step S103, the projection control device PC determines whether it has received multi-projection information from all projectors. If so, it proceeds to step S104; if not, it returns to step S103.

In step S104, the MPU 102, which functions as a comparison unit, compares the multi-projection information received from the projectors PJ11 to PJ14 with the multi-projection information stored in the memory unit 105, and selects the majority multi-projection information. Here, it is assumed that the memory unit 105 stores multi-projection information related to tile projection of 1 row x 2 columns, as shown in FIG. 6.

When comparing the multi-projection information of each item, projectors PJ11 and PJ13 store information regarding 2 rows x 2 columns of tile projection, while projector PJ12 and projection control device PC store information regarding 1 row x 2 columns of tile projection. Therefore, these two pieces of multi-projection information are the majority, and are selected as the majority multi-projection information. Here, the blending width and allocation of the multi-projection information are not taken into consideration, but the comparison may be made taking the blending width and allocation into consideration.

In step S105, it is determined whether the majority of the multi-projection information is determined to be one. If the majority of the multi-projection information is not determined to be one, the process proceeds to step S106, and if the majority of the multi-projection information is determined to be one, the process proceeds to step S108. In this example, since there are two majority of the multi-projection information, the process proceeds to step S106.

In step S106, the majority of the multi-projection information selected in step S104 is displayed on the display unit 105, and the user is allowed to select any one of the multi-projection information using the input unit 101.

In step S107, it is determined whether the user's input is complete and multi-projection information has been selected. If the user's input is complete and multi-projection information has been selected, the process proceeds to step S108, and if the input is not complete, the process returns to step S106. Here, it is assumed that the user has selected multi-projection information for 2-row x 2-column tile projection stored in projectors PJ11 and PJ13.

In step S108, the one piece of multi-projection information determined in step S105 or step S107 is set as the initial value of the parameters required when performing multi-projection image adjustment. In this way, the majority information from multiple pieces of multi-projection information is used, so there is no need for a device that stores information on behalf of the entire system, such as a master device. This reduces the risk of information being lost due to a failure of the master device.

In step S109, the MPU 102, which functions as a setting unit, executes a sub-process of multi-projection image adjustment. This sub-process itself can adjust the multi-projection image by a conventionally known method, as disclosed in, for example, Patent Document 1. In Patent Document 1, the parameters required for multi-projection screen adjustment are set by a user operation, and then adjustment is performed. In the first embodiment, since the majority multi-projection information has already been set as a parameter in step S108, if the user has no problem with the set parameters, he or she can start adjustment without performing parameter setting operations. By adopting the majority multi-projection information as the parameter initial value for multi-projection image adjustment, when the projection control device PC or projector is replaced due to a failure or other reason, it is possible to reduce the user's adjustment effort and prevent erroneous settings when performing multi-projection image adjustment again. After the multi-projection image adjustment is completed, the process proceeds to step S110.

In step S110, the communication unit 103 transmits the multi-projection information used for adjusting the multi-projection image to the projectors PJ11 to PJ14, and updates the multi-projection information recorded in each of them. In the case of this example, after updating the multi-projection information, the projectors PJ11 to PJ14 are stored with the multi-projection information corresponding to each of Figures 7 (A) to (D).

In step S111, the multi-projection information used for adjusting the multi-projection image is stored in the memory unit 105. In this example, the multi-projection information shown in FIG. 8 is stored in the memory unit 105.

As such, this embodiment relates to a projection control device for a multi-projection system, an image projection device, a projection system, and a method for controlling a multi-projection system. By adjusting a multi-projection image using the projection control device of this embodiment, it is possible to reduce the burden on a user who adjusts a multi-projection system after replacing some of the projectors included in the multi-projection system.

Second Embodiment
A multi-projection system 2000 according to the second embodiment will be described with reference to the block diagram of FIG. 9. The same components as those in the first embodiment are given the same reference numerals, and description thereof will be omitted. The multi-projection system 2000 according to the second embodiment has a plurality of projectors PJ21, PJ22, PJ23, and PJ24. The projectors PJ21, PJ22, PJ23, and PJ24 project images S11, S12, S13, and S14, respectively, onto a projection surface. The multi-projection system 2000 forms a multi-projection image using images projected from the plurality of projectors.

For simplicity of explanation, the multi-projection system 2000 of the second embodiment has four projectors, but any number of projectors may be used to configure the multi-projection system of the present invention. In addition, the arrangement of the multi-projection images in the second embodiment is two rows and two columns, but it may be one row and four columns or another arrangement. Each of the images S11 to S14 projected from the projectors has an area (not shown) where it partially overlaps with an adjacent image. This makes it possible to make the seams between the projected images less noticeable.

The projectors PJ21 to PJ24 are connected via a network hub HUB. The projectors PJ21 to PJ24 can communicate with each other via the network hub HUB. All of the projectors PJ21 to PJ24 in the second embodiment can perform multi-projection image adjustment. As an example, a case where the projector PJ21 performs multi-projection image adjustment on behalf of the projectors will be described here. The projector PJ21 may be equipped with a camera CAM (imaging device) that captures the multi-projection image projected on the projection surface. The projector PJ21 can perform adjustments (hereinafter referred to as multi-projection image adjustments) to move or deform the images projected from the projectors PJ21 to PJ24 based on the captured image acquired from the camera CAM in order to form a multi-projection image on the projection surface. After the multi-projection image adjustment, the camera CAM can be removed.

(Image projection devices/projectors)
The projectors PJ21 to PJ24 according to the second embodiment will be described with reference to the block diagram of Fig. 10. Since the projectors PJ21 to PJ24 are the same, the projector PJ21 will be described as a representative. The same components as those in the first embodiment will be given the same reference numerals, and the description will be omitted.

The captured image input unit 214 can acquire data of an image captured by the camera CAM (Figure 9). The acquired captured image data is output to the MPU 215. The MPU 215 functions as a comparison unit capable of comparing multi-projection information, which will be described later. A specific example of this will be explained in a flowchart, which will be described later. The MPU 215 also functions as a setting unit capable of adjusting the multi-projection screen based on the multi-projection information and the captured image by the camera CAM.

(Flowchart of Image Projection Apparatus)
A method for controlling a multi-projection system using projectors PJ21 to PJ24 according to the second embodiment will be described with reference to the flowchart in Fig. 11. Since the projectors PJ21 to PJ24 are identical, the case where the projector PJ21 performs multi-projection image adjustment will be described as an example.

When control of the multi-projection system is started, in step S201, it is determined whether or not the user has started multi-projection image adjustment using the operation unit 211. If the start of multi-projection image adjustment is detected, the process proceeds to step S202, and if not, the process returns to step S201.

In step S202, the communication unit 212 requests the projectors PJ22 to PJ24 to transmit the multi-projection information that each of them stores. For example, it is assumed that the projectors PJ22 to PJ24 store the multi-projection information as shown in Figures 12 (A) to (C). Here, it is assumed that the projectors PJ22 and PJ23 store information regarding 2 rows x 2 columns of tile projection, and the projector PJ24 stores information regarding 1 row x 2 columns of tile projection.

In step S203, projector PJ21 determines whether it has received multi-projection information from all projectors. If it has received the information, it proceeds to step S204; if not, it returns to step S203.

In step S204, the MPU 215, which functions as a comparison unit, compares the multi-projection information received from projectors PJ22 to PJ24 with the multi-projection information stored in the memory unit 213 of projector PJ21, and selects the majority multi-projection information. Here, it is assumed that the memory unit 213 stores multi-projection information related to tile projection of 1 row x 2 columns, as shown in FIG. 13.

When comparing the multi-projection information of each, projectors PJ22 and PJ23 store information regarding tile projection of 2 rows x 2 columns, while projectors PJ21 and PJ24 store information regarding tile projection of 1 row x 2 columns. Therefore, these two pieces of multi-projection information are the majority, and are selected as the majority multi-projection information. Here, the blending width and allocation of the multi-projection information are not taken into consideration, but the comparison may be made taking the blending width and allocation into consideration.

In step S205, it is determined whether a single piece of majority multi-projection information is determined. If a single piece of majority multi-projection information is not determined, the process proceeds to step S206. If a single piece of multi-projection information is determined, the process proceeds to step S208. In this example, since there are two pieces of majority multi-projection information, the process proceeds to step S206.

In step S206, the majority of the multi-projection information selected in step S204 is projected and displayed, and the user is allowed to select any one of the multi-projection information using the operation unit 211.

In step S207, it is determined whether the user's input is complete and multi-projection information has been selected. If the user's input is complete and multi-projection information has been selected, the process proceeds to step S208, and if the input is not complete, the process returns to step S206. Here, it is assumed that the user has selected multi-projection information for 2-row x 2-column tile projection stored in projectors PJ22 and PJ23.

In step S208, the multi-projection information determined in step S205 or step S207 is set as the initial value of the parameters required when performing multi-projection image adjustment.

In step S209, the MPU 215, which functions as a setting unit, executes a sub-process of multi-projection image adjustment. This sub-process itself can be realized, for example, by the prior art described in step S109 of the first embodiment. In the second embodiment, since the majority multi-projection information has already been set as a parameter in step S208, if the user has no problem with the set parameters, the user can start adjustment without performing parameter setting operations. By adopting the majority multi-projection information as the initial parameter value for multi-projection image adjustment, if the projection control device PC or projector is replaced due to a malfunction or other reason, it is possible to reduce the user's adjustment effort and prevent erroneous settings when performing multi-projection image adjustment again. After the multi-projection image adjustment is completed, the process proceeds to step S210.

In step S210, the communication unit 212 transmits the multi-projection information used for adjusting the multi-projection image to the projectors PJ22 to PJ24, and updates the multi-projection information stored in each of the projectors. In this example, after updating the multi-projection information, the projectors PJ22 to PJ24 store the multi-projection information corresponding to each of Figures 14 (A) to (C).

In step S211, the multi-projection information used for adjusting the multi-projection image is stored in the memory unit 215 of the projector PJ21 itself. In this example, the memory unit 215 of the projector PJ21 stores the multi-projection information shown in FIG. 15.

As such, this embodiment relates to an image projection device, a projection system, and a method for controlling a multi-projection system in a multi-projection system. By performing multi-projection image adjustment using the image projection device of this embodiment, it is possible to reduce the burden on a user who adjusts a multi-projection system after replacing some of the projectors included in the multi-projection system.

The disclosure of each embodiment includes the following configurations and methods:

(Configuration 1)
A control device for controlling a plurality of image projection devices,
a communication unit that communicates with the plurality of image projection devices and acquires multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
a setting unit that sets the largest number of pieces of multi-projection information among the pieces of multi-projection information acquired from the plurality of image projection devices to the plurality of image projection devices.

(Configuration 2)
A control device for controlling a plurality of image projection devices,
a communication unit that communicates with the plurality of image projection devices and acquires multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
a storage unit that stores multi-projection information set for a plurality of image projection devices;
a setting unit that sets the largest amount of multi-projection information among the multi-projection information acquired from the plurality of image projection devices and the multi-projection information stored in the memory unit to the plurality of image projection devices.

(Configuration 3)
An input unit that accepts an input operation by a user;
3. The control device according to configuration 1 or 2, wherein when there are a plurality of pieces of the largest number of pieces of multi-projection information, the multi-projection information selected by the input unit from the plurality of pieces of multi-projection information is set to the plurality of image projection devices.

(Configuration 4)
4. The control device according to any one of configurations 1 to 3, wherein the setting unit stores the largest number of pieces of multi-projection information in each of the plurality of image projection devices.

(Configuration 5)
a storage unit that stores multi-projection information set for a plurality of image projection devices;
2. The control device according to claim 1, wherein the setting unit stores the largest number of pieces of multi-projection information in the storage unit.

(Configuration 6)
6. The control device according to any one of configurations 1 to 5, wherein the multi-projection information includes at least one of a stack number and a blend width.

(Configuration 7)
A plurality of image projection devices;
7. An image projection system comprising the control device according to any one of configurations 1 to 6.

(Configuration 8)
An image projection device constituting an image projection system including a plurality of image projection devices,
a communication unit that communicates with other image projection devices constituting the image projection system and acquires multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
a setting unit that sets the largest number of pieces of multi-projection information among the pieces of multi-projection information acquired from the plurality of image projection devices to the plurality of image projection devices.

(Method 1)
A control method for controlling a plurality of image projection devices, comprising the steps of:
a communication step of communicating with the plurality of image projection devices and acquiring multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
and setting, in said plurality of image projection devices, the largest number of pieces of multi-projection information among the pieces of multi-projection information acquired from said plurality of image projection devices.

(Configuration 9)
A program for causing a computer to execute the control method according to method 1.

The above describes preferred embodiments of the present invention, but the present invention is not limited to these embodiments, and various modifications and variations are possible within the scope of the gist of the invention.

PC Projection control device 1000, 2000 Multi-projection system PJ11, PJ12, PJ13, PJ14 Projector (image projection device)
PJ21, PJ22, PJ23, PJ24 Projectors (image projection devices)
CAM Camera (imaging device)

Claims (10)

A control device for controlling a plurality of image projection devices,
a communication unit that communicates with the plurality of image projection devices and acquires multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
a setting unit that sets the largest number of pieces of multi-projection information among the pieces of multi-projection information acquired from the plurality of image projection devices to the plurality of image projection devices. A control device for controlling a plurality of image projection devices,
a communication unit that communicates with the plurality of image projection devices and acquires multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
a storage unit that stores multi-projection information set for a plurality of image projection devices;
a setting unit that sets the largest amount of multi-projection information among the multi-projection information acquired from the plurality of image projection devices and the multi-projection information stored in the memory unit to the plurality of image projection devices. An input unit that accepts an input operation by a user;
2. The control device according to claim 1, wherein, when there are a plurality of pieces of the largest number of pieces of multi-projection information, the multi-projection information selected by said input unit from the plurality of pieces of multi-projection information is set to said plurality of image projection devices. The control device according to claim 1, characterized in that the setting unit stores the largest number of multi-projection information in each of the multiple image projection devices. a storage unit that stores multi-projection information set for a plurality of image projection devices;
The control device according to claim 1 , wherein the setting unit stores the largest number of pieces of multi-projection information in the storage unit. The control device according to claim 1, characterized in that the multi-projection information includes at least one of the number of stacked units and the blend width. A plurality of image projection devices;
An image projection system comprising the control device according to claim 1 . An image projection device constituting an image projection system including a plurality of image projection devices,
a communication unit that communicates with other image projection devices constituting the image projection system and acquires multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
a setting unit that sets the largest number of pieces of multi-projection information among the pieces of multi-projection information acquired from the plurality of image projection devices to the plurality of image projection devices. A control method for controlling a plurality of image projection devices, comprising the steps of:
a communication step of communicating with the plurality of image projection devices and acquiring multi-projection information related to a layout of multi-projection from the plurality of image projection devices;
and setting, in said plurality of image projection devices, the largest number of pieces of multi-projection information among the pieces of multi-projection information acquired from said plurality of image projection devices. A program for causing a computer to execute the control method described in claim 9.

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