JP2020034935A - Image projection system and control method of image projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately correct an image projected by each projector to a target color when an image is projected by a plurality of projectors. A target color is determined based on a first captured image captured by a photographing unit 140A of at least a part of a first image projected by a projection optical system 113A of a projector 100A, and projected by a projection optical system 113A of the projector 100B. Based on the second captured image obtained by capturing at least a part of the second image obtained by the photographing unit 140A, the first correction data for correcting the color of the projected image of the projector 100B to the target color is obtained. [Selection diagram] Fig. 2

Description

  The present invention relates to an image projection system, a projector, and a method for controlling the image projection system.

  2. Description of the Related Art Conventionally, there has been known a technique of connecting images projected by a plurality of projectors to display one large image. When an image is projected by a plurality of projectors, it is known that the color of an image projected by each projector is shifted due to individual differences of the projectors or the like (for example, see Patent Document 1). In the image projection display device of Patent Literature 1, in order to correct a color difference between projectors, images of the highest gradation level in order of red (R), green (G), and blue (B) are sequentially displayed on a screen for a plurality of projectors. The image is projected, and each photographed image is sequentially photographed by a colorimetric system. Then, a correction matrix is obtained for each projector so that the XYZ values of the projection plane center positions of all the projectors are the same, and the input signal is corrected using the obtained correction matrix.

JP-A-2002-72359

However, in the case where a projection device on which an image is projected is photographed by a photographing device mounted on the projector, and a color shift of an image projected from a plurality of projectors is corrected, a photographing device of one projector requires a photographing device of one projector. You may not be able to shoot everything. That is, since the projector is installed at a position suitable for image projection, a sufficient distance between the imaging device and the projection surface cannot be secured, and the entire projection surface may not be able to be imaged.
In addition, when correcting a color shift of an image using a plurality of photographing devices mounted on a plurality of projectors, since the photographing devices mounted on each projector have individual differences in sensitivity, images are photographed by the photographing devices. There is a problem that an error occurs in a photographed value.
The present invention has been made in view of the above circumstances, and has an object to accurately correct an image projected by each projector to a target color when an image is projected by a plurality of projectors.

In order to achieve the above object, an image projection system according to the present invention is an image projection system including a first projector and a second projector, wherein the first projector has a first projection unit that projects a first image. A first imaging unit that captures at least a part of the first image projected by the first projection unit, and a range including at least a part of the second image projected by the second projector, The second projector includes a second projection unit that projects the second image, and a first captured image obtained by capturing the at least a part of the first image projected by the first projection unit by the first capturing unit. A target color is determined based on a second captured image obtained by capturing at least a part of the second image projected by the second projection unit by the first capturing unit. And it obtains the first correction data for correcting the color of the projection image of Jekuta the color of the target.
According to the present invention, a target color is set based on a first captured image of the first image captured by the first capturing unit, and a second color is set based on the second captured image of the second image captured by the first capturing unit. First correction data for correcting the color of the image projected by the projector to the target color can be obtained. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the image projected by each projector to a target color.

Further, according to the present invention, the photographed value at the first position on the first photographed image is defined as the target color, and the photographed value at the second position on the second photographed image is different from the photographed value at the first position. Preferably, the first correction data for correcting the projection image is obtained in the second projector.
According to the present invention, it is possible to make correction so that the photographed value at the first position on the first photographed image is the target color and the photographed value at the second position on the second photographed image is the target color. Therefore, when an image is projected by a plurality of projectors, correction to a target color can be performed with high accuracy.

Further, in the image projection system according to the present invention, the first projector captures a second position on the second captured image by using a captured value of a first position on the first captured image as the target color. A first calculation unit that calculates the first correction data for correcting the projection image so that the value becomes the photographed value of the first position; and a first correction data calculated by the first calculation unit. And a transmission unit for transmitting to the second projector.
According to the present invention, the first correction data can be calculated in the first projector, and the calculated first correction data can be transmitted to the second projector.

Further, according to the present invention, in the image projection system, the first correction data is data for correcting a color at a predetermined point in the second captured image to the target color. A second imaging unit configured to capture an area including at least a part of the second image projected by the projection unit, wherein the second imaging unit uses the second imaging unit to capture at least one of the second images projected by the second projection unit; A second correction data for correcting colors at a plurality of locations in the second image to the color of the predetermined point based on a third captured image obtained by capturing the portion is obtained.
According to the present invention, based on the third captured image obtained by capturing at least a part of the second image projected by the second projection unit by the second capturing unit, the colors of a plurality of locations in the second image are determined by using a predetermined point. Second correction data to be corrected to a color can be obtained. Therefore, the colors at a plurality of locations in the second image can be corrected to the colors at the predetermined points.

Also, in the image projection system according to the present invention, the first projector may change the colors of the plurality of locations in the second image based on the third captured image received from the second projector, by using the predetermined point. And a second calculation unit for obtaining the second correction data for correcting the color.
According to the present invention, the first projector can obtain the second correction data based on the third captured image captured by the second projector.

Further, in the image projection system according to the present invention, the first projector captures a second position on the second captured image by using a captured value of a first position on the first captured image as the target color. The first calculator and the first calculator calculate the first correction data for correcting the second image in the second projector so that the value becomes the photographed value at the first position. A transmitting unit that transmits the first correction data to the second projector, wherein the second projector is configured to transmit a plurality of the plurality of images in the second image based on the first correction data received from the first projector. The second correction data for correcting the color of the portion to the color of the predetermined point is obtained.
According to the present invention, the first correction data calculated by the first projector is transmitted to the second projector, and the color of a plurality of locations in the second image is set in the second projector based on the first correction data by a predetermined point. The second correction data for correcting the color can be obtained.

An image projection system according to the present invention is an image projection system including a first projector and a second projector, wherein the first projector includes a first projection unit that projects a first image, and a first projection unit. A first image capturing unit that captures an area including at least a part of the projected first image and at least a part of the second image projected by the second projector, wherein the second projector includes: A second projection unit configured to project a second image, wherein the first projector is configured to perform at least a part of the first image projected by the first projection unit based on a first photographed image photographed by the first photographing unit. The third correction data for correcting the color of the projected image of the second image to the preset target color is obtained, and at least a part of the second image projected by the second Based on the second captured image captured by the imaging unit, wherein the color of the projection image of the second projector to obtain the fourth correction data for correcting the color of the target.
According to the present invention, based on the first captured image obtained by capturing the first image, third correction data for correcting the color of the image projected by the first projector to the target color is obtained, and the second captured image obtained by capturing the second image is obtained. Based on the image, fourth correction data for correcting the color of the image projected by the second projector to a target color can be obtained. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the image projected by each projector to a target color.

An image projection system according to the present invention is an image projection system including a first projector and a second projector, wherein the first projector includes a first projection unit that projects a first image, and a first projection unit. A first image capturing unit that captures an area including at least a part of the projected first image and at least a part of the second image projected by the second projector, wherein the second projector includes: A second projection unit that projects a second image, a range including at least a part of the first image projected by the first projection unit, and at least a part of the second image projected by the second projector; And a second photographing unit for photographing the first photographing image obtained by photographing at least a part of the first image projected by the first projecting unit by the first photographing unit. A color of a projected image of the second projector based on a second captured image obtained by capturing at least a part of the second image projected by the second projection unit by the second capturing unit. It is characterized in that first correction data for correcting the target color is obtained.
According to the present invention, the target color is set based on the first captured image obtained by capturing the first image, and the color of the projected image of the second projector is set based on the second captured image obtained by capturing the second image. The first correction data to be corrected can be obtained. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the image projected by each projector to a target color.

An image projection system according to the present invention is an image projection system including a first projector and a second projector, wherein the first projector includes a first projection unit that projects a first image, and a first projection unit. A first image capturing unit that captures an area including at least a part of the projected first image and at least a part of the second image projected by the second projector, wherein the second projector includes: A second projection unit that projects a second image, a range including at least a part of the first image projected by the first projection unit, and at least a part of the second image projected by the second projector; And a second photographing unit for photographing the first photographing image obtained by photographing at least a part of the first image projected by the first projecting unit by the first photographing unit. Then, third correction data for correcting the color of the projection image of the first projector to a preset target color is obtained, and at least a part of the second image projected by the second projection unit is converted to the second correction data. Based on a second photographed image photographed by the second photographing unit, fourth correction data for correcting a color of a projected image of the second projector to the target color is obtained.
According to the present invention, based on the first captured image obtained by capturing the first image, third correction data for correcting the color of the image projected by the first projector to the target color is obtained, and the second captured image obtained by capturing the second image is obtained. Based on the image, fourth correction data for correcting the color of the image projected by the second projector to a target color can be obtained. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the image projected by each projector to a target color.

A projector according to an aspect of the invention includes a projection unit configured to project a first image, a range including at least a part of the first image projected by the projection unit, and at least a portion of a second image projected by another projector. A shooting unit that shoots the target image, and sets a target color based on a first shot image shot by the shooting unit of at least a part of the first image projected by the projection unit, and the target image is projected by the other projector. A first calculating unit that obtains first correction data for correcting a color of a projection image of the other projector to the target color based on a second captured image obtained by capturing at least a part of a second image by the capturing unit. It is characterized by having.
According to the present invention, a target color is set based on a first captured image obtained by capturing a first image, and another color is set based on a second captured image obtained by capturing at least a part of a second image projected by another projector. First correction data for correcting the color of the image projected by the projector to the target color can be calculated. Therefore, it is possible to accurately correct an image projected by the projector to a target color.

A projector according to an aspect of the invention includes a projection unit configured to project a first image, a range including at least a part of the first image projected by the projection unit, and at least a portion of a second image projected by another projector. And a color of the projection image projected by the projection unit based on a first captured image obtained by capturing at least a part of the first image projected by the projection unit by the photography unit. A third correction data for correcting to the set target color is obtained, and based on a second photographed image obtained by photographing at least a part of the second image projected by the other projector by the photographing unit, the other projector is used. And a first calculation unit for obtaining fourth correction data for correcting the color of the projection image of the above to the target color.
According to the present invention, it is possible to calculate third correction data for correcting a color of a projection image projected by a projection unit to a preset target color based on a first captured image obtained by capturing the first image. It is possible to calculate fourth correction data for correcting a color of a projected image of another projector to a target color based on a second captured image obtained by capturing at least a part of a second image projected by another projector. . Therefore, it is possible to accurately correct an image projected by the projector to a target color.

A method for controlling an image projection system according to the present invention is a method for controlling an image projection system including a first projector and a second projector, wherein at least a part of a first image projected by the first projector; Photographing a range including at least a part of a second image projected by a second projector by a first photographing unit of the first projector; and photographing at least a part of the first image by the first projector of the first projector. Determining a target color based on a first photographed image photographed by a photographing unit; and a step of determining at least a part of the second image based on a second photographed image photographed by the first photographing unit of the first projector. 2 obtaining first correction data for correcting the color of the image projected by the projector to the target color. And it features.
According to the present invention, a target color is set based on a first captured image of the first image captured by the first capturing unit, and a second color is set based on the second captured image of the second image captured by the first capturing unit. First correction data for correcting the color of the image projected by the projector to the target color can be obtained. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the image projected by each projector to a target color.

A method for controlling an image projection system according to the present invention is a method for controlling an image projection system including a first projector and a second projector, wherein at least a part of a first image projected by the first projector; Photographing a range including at least a part of the second image projected by the second projector by the first photographing unit of the first projector and the second photographing unit of the second projector; and at least one of the first images. Determining a target color based on a first captured image captured by the first capturing unit of the first projector, and a second captured image capturing at least a portion of the second image by the second capturing unit Obtaining first correction data for correcting the color of the image projected by the second projector to the target color based on Characterized in that it has a.
According to the present invention, a target color is set based on a first captured image obtained by capturing a first image, and a second captured image obtained by capturing at least a part of a second image projected by a second projector by a second capturing unit. , The first correction data for correcting the color of the image projected by the second projector to the target color can be calculated. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the image projected by each projector to a target color.

In the control method of the image projection system according to the present invention, the step of photographing alternately switches between the projection of the first image by the first projector and the projection of the second image by the second projector. Then, at least a part of the first image and at least a part of the second image are alternately photographed.
According to the present invention, the first image and the second image are alternately switched and projected, and at least a part of the first image and at least a part of the second image can be alternately photographed.

FIG. 1 is a system configuration diagram of an image projection system. FIG. 1 is a configuration diagram illustrating a configuration of a projector. 5 is a flowchart illustrating the operation of the projector according to the first embodiment. 5 is a flowchart illustrating the operation of the projector according to the first embodiment. FIG. 2 is a diagram showing a projection area and a shooting range of the projector. FIG. 3 is a diagram illustrating captured image data generated by a capturing unit. FIG. 7 is a diagram illustrating a change in photographed value of photographed image data for each gradation. 9 is a flowchart illustrating the operation of the projector according to the second embodiment. FIG. 3 is a diagram illustrating captured image data generated by a capturing unit. FIG. 7 is a diagram illustrating the principle of the second embodiment. FIG. 4 is a diagram for explaining a case where an image is projected by four projectors. The figure for demonstrating the operation | movement of a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of the image projection system 1.
The image projection system 1 shown in FIG. 1 includes projectors 100A (first projector) and 100B (second projector), and an image supply device 200 that supplies image data to these projectors 100A and 100B.
FIG. 1 shows projectors 100A and 100B as projectors, but the number of projectors is not limited to two. Hereinafter, when it is not necessary to distinguish the projector 100A from the projector 100B, the projector 100A is referred to as the projector 100.

The projector 100A and the projector 100B are arranged in front of the screen SC as a projection surface, and project an image on the screen SC.
In the present embodiment, the projectors 100A and 100B are arranged adjacent to each other in the horizontal direction (horizontal direction), and the projectors 100A and 100B project images on different areas of the screen SC. Generally, when such an image is projected, the images are projected such that a part of the projection area of the image projected by the adjacent projectors 100A and 100B overlaps.
The projectors 100A and 100B are connected to the image supply device 200, respectively, and project images supplied from the image supply device 200 onto the screen SC. In the present embodiment, the projector 100A projects an image on the left side toward the screen SC, and the projector 100B projects an image on the right side toward the screen SC. Hereinafter, the area of the screen SC on which the projector 100A projects an image is referred to as a first projection area 141, and the area of the screen SC on which the projector 100B projects an image is referred to as a second projection area 142.

  FIG. 2 is a configuration diagram illustrating a configuration of the projector 100A. Since the projector 100A and the projector 100B have almost the same configuration, the configuration of the projector 100A will be described as a representative.

  The image supply device 200 is connected to the projector 100A. The image supply device 200 is a device that supplies an image signal to the projector 100A. The projector 100A projects an image based on an image signal supplied from the image supply device 200 or an image based on image data stored in advance in a storage unit 170A described later on the screen SC. As the image supply device 200, for example, a video reproduction device, a DVD (Digital Versatile Disk) reproduction device, a TV tuner device, a CATV (Cable television) set-top box, a video output device such as a video game device, a personal computer, or the like is used. Can be

The projector 100A includes an image input unit 151A. The image input unit 151A includes a connector for connecting a cable and an interface circuit (both not shown), and inputs an image signal supplied from the image supply device 200 connected via the cable. The image input unit 151A converts an input image signal into image data and outputs the image data to the image processing unit 152A.
The interface circuit included in the image input unit 151A may be, for example, an interface for data communication such as Ethernet (registered trademark), IEEE1394, or USB. Further, the interface circuit included in the image input unit 151A may be an interface for image data such as MHL (registered trademark), HDMI (registered trademark), and DisplayPort.
Further, the image input unit 151A may be configured to include, as connectors, a VGA terminal to which an analog video signal is input and a DVI (Digital Visual Interface) terminal to which digital video data is input. Furthermore, the image input unit 151A includes an A / D conversion circuit, and when an analog video signal is input via a VGA terminal, converts the analog video signal into image data using the A / D conversion circuit, and outputs the image data to the image processing unit 152A. Output to

  The projector 100A includes a display unit 110A that forms an optical image and projects (displays) the image on the screen SC. The display unit 110A includes a light source unit 111A as a light source, a light modulation device 112A, and a projection optical system 113A.

  The light source unit 111A includes a light source such as a xenon lamp, an ultra-high pressure mercury lamp, an LED (Light Emitting Diode), or a laser light source. Further, the light source unit 111A may include a reflector and an auxiliary reflector that guide light emitted from the light source to the light modulation device 112A. Further, the light source unit 111A includes a lens group for improving the optical characteristics of the projection light, a polarizing plate, a dimming element that reduces the amount of light emitted from the light source on the path to the light modulator 112A, etc. (Abbreviation).

  The light source unit 111A is driven by a light source driving unit 121A. The light source driving unit 121A is connected to the internal bus 180A. The light source driving unit 121A turns on and off the light source of the light source unit 111A under the control of the control unit 160A.

  The light modulation device 112A includes, for example, three liquid crystal panels corresponding to three primary colors of RGB. The light emitted from the light source unit 111A is separated into three color lights of RGB and is incident on the corresponding liquid crystal panel. The three liquid crystal panels are transmissive liquid crystal panels, and modulate transmitted light to generate image light. The image light modulated by passing through each liquid crystal panel is synthesized by a synthesizing optical system such as a cross dichroic prism and emitted to the projection optical system 113A.

The light modulator 112A is connected to a light modulator driving unit 122A that drives a liquid crystal panel of the light modulator 112A. The light modulator driving unit 122A is connected to the internal bus 180A.
The light modulation device driving unit 122A generates R, G, and B image signals based on display image data (described later) input from the image processing unit 152A. The light modulator driving unit 122A drives the corresponding liquid crystal panel of the light modulator 112A based on the generated R, G, and B image signals, and draws an image on each liquid crystal panel.

  The projection optical system (first projection unit) 113A includes a lens group that projects image light modulated by the light modulator 112A in the direction of the screen SC and forms an image on the screen SC. Further, the projection optical system 113A may include a zoom mechanism for enlarging / reducing a projected image on the screen SC and adjusting the focus, and a focus adjusting mechanism for adjusting the focus.

The projector 100A includes an operation panel 131A and a processing unit 133A. The processing unit 133A is connected to the internal bus 180A.
Various operation keys and a display screen configured by a liquid crystal panel are displayed on the operation panel 131A functioning as a user interface. When an operation key displayed on operation panel 131A is operated, processing unit 133A outputs data corresponding to the operated key to control unit 160A. Further, the processing unit 133A causes the operation panel 131A to display various screens under the control of the control unit 160A.
In addition, a touch sensor for detecting contact with the operation panel 131A is superposed and integrally formed on the operation panel 131A. The processing unit 133A detects, as an input position, the position of the operation panel 131A touched by a user's finger or the like, and outputs data corresponding to the detected input position to the control unit 160A.

Further, the projector 100A includes a remote control light receiving unit 132A that receives an infrared signal transmitted from the remote control 5A used by the user. The remote control light receiving unit 132A is connected to the processing unit 133A.
Remote control light receiving section 132A receives an infrared signal transmitted from remote control 5A. The processing unit 133A decodes the infrared signal received by the remote control light receiving unit 132A, generates data indicating the operation content of the remote control 5A, and outputs the data to the control unit 160A.

The projector 100A includes a photographing unit (first photographing unit, photographing unit) 140A.
The imaging unit 140A includes a camera having an imaging optical system, an imaging element, an interface circuit, and the like, and takes an image of the projection direction of the projection optical system 113A under the control of the control unit 160A.
The photographing range of the photographing unit 140A, that is, the angle of view, is an angle of view in which a range including the screen SC and its peripheral portion is a photographing range. The imaging unit 140A outputs the captured image data to the control unit 160A.

  The projector 100A includes a communication unit (transmission unit) 175A. The communication unit 175A is an interface for performing data communication, and is connected to the communication line 3 in the present embodiment. The communication unit 175A transmits and receives various data to and from the projector 100B via the communication line 3 under the control of the control unit 160A. In the present embodiment, the communication unit 175A is a wired interface for connecting a cable (not shown) configuring the communication line 3. The communication unit 175A may be a wireless communication interface that executes wireless communication such as a wireless LAN or Bluetooth (registered trademark). In this case, part or all of the communication line 3 is configured by a wireless communication line.

  The projector 100A includes an image processing system. The image processing system mainly includes a control unit 160A that controls the entire projector 100A, and further includes an image processing unit 152A, a frame memory 155A, and a storage unit 170A. The control unit 160A, the image processing unit 152A, and the storage unit 170A are connected to the internal bus 180A.

The image processing unit 152A develops image data input from the image input unit 151A in the frame memory 155A under the control of the control unit 160A. The image processing unit 152A performs, for example, resolution conversion (scaling) processing or resizing processing, correction of distortion, shape correction processing, digital zoom processing, image hue and brightness on the image data developed in the frame memory 155A. Perform processing such as adjustment. The image processing unit 152A executes a process specified by the control unit 160A, and performs a process using a parameter input from the control unit 160A as necessary. Further, the image processing unit 152A can, of course, execute a combination of a plurality of the processes described above.
The image processing unit 152A reads the processed image data from the frame memory 155A, and outputs the read image data to the light modulator driving unit 122A as display image data.

  The control unit 160A includes hardware such as a CPU, a ROM, and a RAM (all not shown). The ROM is a nonvolatile storage device such as a flash ROM, and stores a control program and data. The RAM constitutes a work area of the CPU. The CPU expands the control program read from the ROM or the storage unit 170A in the RAM, and executes the control program expanded in the RAM to control each unit of the projector 100A.

  Further, the control unit 160A includes, as functional blocks, a projection control unit 161A, a photographing control unit 162A, and a correction control unit 163A. These functional blocks are realized by the CPU executing a control program stored in the ROM or the storage unit 170A.

The projection control unit 161A adjusts the display mode of the image on the display unit 110A, and executes the projection of the image on the screen SC.
Specifically, the projection control unit 161A controls the image processing unit 152A to perform image processing on the image data input from the image input unit 151A. At this time, the projection control unit 161A may read parameters required by the image processing unit 152A for processing from the storage unit 170A and output the parameters to the image processing unit 152A.
Further, the projection control unit 161A controls the light source driving unit 121A to turn on the light source of the light source unit 111A and adjust the brightness of the light source. Accordingly, the light source emits light, and image light modulated by the light modulator 112A is projected on the screen SC by the projection optical system 113A.

  The photographing control unit 162A causes the photographing unit 140A to perform photographing, and acquires photographed image data photographed by the photographing unit 140A.

  The correction control unit (first calculation unit, second calculation unit) 163A calculates the chromaticity of the projection image projected by the projector 100A on the first projection area 141 and the projection image projected by the projector 100B on the second projection area 142 ( Color, especially hue and saturation). Details of the correction control unit 163A will be described with reference to flowcharts shown in FIGS.

  The storage unit 170A is a nonvolatile storage device, and is realized by a storage device such as a flash memory, an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), and an HDD (Hard Disc Drive). The storage unit 170A stores pattern image data, which is image data to be projected on the screen SC by the display unit 110A, and adjustment image data.

FIGS. 3 and 4 are flowcharts showing the operation of the projectors 100A and 100B of the first embodiment.
This processing flow is a processing flow for adjusting the chromaticity of the image projected on the screen SC by the projector 100A and the image projected on the screen SC by the projector 100B.
In this processing flow, a case will be described in which projector 100A operates as a master device and projector 100B operates as a slave device. The projector 100A as the master unit notifies the projector 100B of an image to be projected on the screen SC, a timing of projecting the image, and a shooting instruction.
In this processing flow, it is assumed that the chromaticity (hue and saturation) of the image projected by the projector 100A on the first projection area 141 is uniform, and the chromaticity of the image projected by the projector 100B on the second projection area 142 is Let it be uniform.
Further, in this processing flow, the chromaticity of the image projected by the projector 100B as the slave unit matches or approaches the chromaticity of the image projected by the projector 100A as the master unit (hereinafter referred to as “fit”). Although described as a process of correcting (expressing), a process of correcting the chromaticity of the image projected by the projector 100A so as to match the chromaticity of the image projected by the projector 100B may be performed.

  The control unit 160A of the projector 100A, which is the master device, monitors the input of the processing unit 133A and determines whether an operation from the operation panel 131A or the remote control 5A has been received (step S1). When there is no data input from processing unit 133A, control unit 160A determines that an operation has not been received (step S1 / NO), and executes another process until data is input from processing unit 133A, or input is not performed. Wait until there is.

  When data is input from processing unit 133A, control unit 160A determines that an operation has been received (step S1 / YES), and determines whether the received operation is an operation for instructing chromaticity correction (step S1). S2). When the operation is not an operation for instructing chromaticity correction (step S2 / NO), control unit 160A executes a process corresponding to the received operation (step S3), and returns to the determination in step S1.

If the received operation is an operation for instructing chromaticity correction (step S2 / YES), first, the correction control unit 163A instructs the projector 100B connected to the communication line 3 to start chromaticity correction.
When a plurality of projectors 100 are connected to the LAN as the communication line 3 and several projectors 100 are selected from the plurality of projectors 100 and the chromaticity correction process is executed, the projector as the master device is used. 100A acquires the device name and IP address of projector 100 connected to the LAN. Then, projector 100A displays the acquired device name and IP address on operation panel 131A, and sets projector 100 selected by operation of operation panel 131A or remote controller 5A as projector 100 for performing chromaticity correction.

  Next, the correction control unit 163A instructs the projection control unit 161A to project the pattern image on the first projection area 141 (step S4). The projection control unit 161A reads the pattern image data from the storage unit 170A, and uses the display unit 110A to project an image (hereinafter, referred to as a pattern image) based on the read pattern image data onto the first projection area 141. In the pattern image, an image in which marks of a predetermined shape are arranged at lattice points in a lattice pattern is formed.

  Next, the correction control unit 163A causes the photographing control unit 162A to generate photographed image data. The photographing control unit 162A controls the photographing unit 140A to photograph in the screen SC direction, and generates photographed image data (step S5). When the generation of the captured image data by the imaging control unit 162A ends, the correction control unit 163A ends the projection of the pattern image onto the first projection area 141.

Next, the correction control unit 163A instructs the projector 100B to project a pattern image based on the pattern image data on the second projection area 142 (Step S6). In the present embodiment, the pattern image projected on the second projection area 142 by the projector 100B is the same image as the pattern image projected on the first projection area 141 by the projector 100A. However, for example, the shape of the mark may be changed between the pattern image projected by the projector 100A on the first projection area 141 and the pattern image projected by the projector 100B on the second projection area 142.
When projecting the pattern image onto the second projection area 142, the correction control unit 163B of the projector 100B transmits a notification signal notifying that the pattern image has been projected to the projector 100A.

  Upon receiving the notification signal notifying that the pattern image has been projected from the projector 100B, the correction control unit 163A causes the imaging control unit 162A to generate captured image data. The photographing control unit 162A controls the photographing unit 140A to photograph in the screen SC direction, and generates photographed image data (step S7).

FIG. 5 is a diagram showing a projection area and a shooting range of the projectors 100A and 100B.
The photographing range 145 photographed by the photographing unit 140A of the projector 100A includes the entire first projection area 141 and a part of the second projection area 142. As shown in FIG. 5, when the first projection area 141 is located on the left side of the screen SC and the second projection area 142 is located on the right side of the screen SC, the imaging range 145 of the imaging unit 140A includes A part of the left side of the second projection area 142 is included.
Further, an imaging range 146 imaged by the imaging unit 140B (second imaging unit) of the projector 100B includes the entire second projection area 142 and a part of the first projection area 141. As shown in FIG. 5, when the first projection area 141 is located on the left side of the screen SC and the second projection area 142 is located on the right side of the screen SC, the imaging range 146 of the imaging unit 140B includes The right part of the first projection area 141 is included.

FIG. 6 is a diagram illustrating captured image data generated by the capturing unit 140A.
6A illustrates captured image data (hereinafter, referred to as first captured image data) obtained by capturing a state in which the projector 100A projects a pattern image on the first projection area 141, and FIG. 6B illustrates the projector 100B. Indicates captured image data (hereinafter, referred to as second captured image data) obtained by capturing a state where the pattern image is projected on the second projection area 142.
As shown in FIG. 6, the pattern image projected on the first projection area 141 is entirely photographed by the imaging unit 140A, and the pattern image projected on the second projection area 142 is patterned by the imaging unit 140A. Part of the image is taken.

The first and second captured image data generated by the capturing unit 140A are input to the correction control unit 163A.
The correction control unit 163A detects a mark arranged at a grid point of the pattern image projected on the first projection area 141 from the input first captured image data, specifies each grid point, and specifies each specified grid. Identify the coordinates of the point. The specified coordinates are the coordinates in the first captured image data.
Next, the correction control unit 163A registers a correspondence table in which the coordinates of each grid point in the specified first captured image data and the coordinates of each grid point in the pattern image data stored in the storage unit 170A are associated with each other. Generate Note that the information for specifying each grid point may be coordinates on the liquid crystal panel of the light modulation device 112A instead of the coordinates of each grid point in the pattern image data. The correction control unit 163A generates a correspondence table in which the coordinates of each grid point of the captured image data are associated with the coordinates of the liquid crystal panel on which each grid point of the pattern image data is drawn.
The correction control unit 163A stores the first and second captured image data and the correspondence table in the storage unit 170A.

Next, the correction control unit 163A instructs the projection control unit 161A to project the adjustment image data. The projection control unit 161A reads out preset adjustment image data from the storage unit 170A, and displays an image (hereinafter, referred to as an adjustment image (first image)) based on the read adjustment image data on the display unit 110A using a screen. The image is projected on the first projection area 141 of the SC (step S8). The adjustment image data is data of a single-color raster image prepared for each color of red (R), green (G), and blue (B), and is prepared for each gradation set in advance.
When the adjustment image data is projected on the screen SC, the correction control unit 163A causes the imaging control unit 162A to generate the captured image data. The photographing control unit 162A controls the photographing unit 140A to photograph in the screen SC direction, and generates photographed image data (step S9). Hereinafter, captured image data of the first projection area 141 on which the adjustment image is projected is referred to as third captured image data (first captured image).
The correction control unit 163A causes the projection control unit 161A to project the adjustment images of all colors and all gradations on the first projection area 141, and causes the imaging control unit 162A to project all the images projected on the first projection area 141. And images for adjustment of all colors and all gradations.

  Next, the correction control unit 163A projects the adjustment images of all colors and all gradations onto the first projection area 141, and ends the shooting of the projected adjustment images of all colors and all gradations. It is determined whether or not the process has been performed (step S10). If the shooting of the adjustment image has not been completed for all colors and all gradations (step S10 / NO), the correction control unit 163A causes the projection control unit 161A to project the adjustment image onto the first projection area 141. At least one of the gradation and the color is changed (step S11), and the processing from step S8 is repeated.

When the shooting is completed for all colors and all gradations of the adjustment image (step S10 / YES), the correction control unit 163A instructs the projector 100B to project the adjustment image on the screen SC. A signal is transmitted to cause the projector 100B to project the adjustment image. That is, the correction control unit 163A alternately switches between the projection of the adjustment image by the projector 100A and the projection of the adjustment image by the projector 100B, and the adjustment image projected by the projector 100A and the adjustment projected by the projector 100B. The shooting with the image for use is performed alternately. The instruction signal includes information indicating the color and gradation of the adjustment image projected on the screen SC.
Upon receiving the instruction signal, the correction control unit 163B of the projector 100B reads out the adjustment image data of the color and gradation designated by the received instruction signal from the storage unit 170B to the projection control unit 161B, and reads the second image of the screen SC. The image is projected onto the projection area 142 (step S12). When the adjustment image (second image) is projected on the screen SC, the correction control unit 163B transmits a notification signal notifying the completion of the projection to the projector 100A.

Upon receiving the notification signal from projector 100B, correction control section 163A of projector 100A instructs photography control section 162A to generate photographed image data. The photographing control unit 162A controls the photographing unit 140A to photograph the screen SC, and generates photographed image data (step S13). Hereinafter, captured image data obtained by capturing the state where the adjustment image is projected on the second projection area 142 is referred to as fourth captured image data (second captured image).
The correction control unit 163A causes the projector 100B to project adjustment images of all colors and all gradations on the first projection area 141, and causes the imaging control unit 162A to project all the colors projected on the second projection area 142. Then, images for adjustment of all gradations are shot.

The correction control unit 163A determines whether or not the adjustment image is projected on the second projection area 142 in all colors and all gradations of the adjustment image, and whether or not shooting of the projected adjustment image has been completed ( Step S14).
When the shooting of the adjustment image has not been completed for all colors and all gradations (step S14 / NO), the correction control unit 163A causes the projector 100B to project the adjustment image floor to be projected onto the second projection area 142. At least one of the key and the color is changed (step S15), and the processing from step S12 is repeated.

  Further, when the photographing is completed for all colors and all gradations of the adjustment image (step S14 / YES) and the generation of the third and fourth photographed image data is completed, the correction control unit 163A sets the correction value to Generated for each gradation and color. The correction value is a value for correcting the chromaticity (hue and saturation) of the grid point on the fourth captured image data to the chromaticity of the grid point on the third captured image data.

  First, the correction control unit 163A selects a color and a gradation for which a correction value is to be generated. Next, the correction control unit 163A selects a grid point on the pattern image data (hereinafter, referred to as grid point A (first position)) (step S16). The pattern image data is image data stored in the storage unit 170A. The grid point to be selected is arbitrary, but in this processing flow, it is assumed that the correction control unit 163A selects the grid point A located at the center of the pattern image data shown in FIG.

  Next, the correction control unit 163A selects the third captured image data of the color and gradation for which the correction value is to be generated, and refers to the correspondence table to determine the grid point A in the selected third captured image data. Is specified, and the photographed value of the third photographed image data at the specified position is obtained (step S17). The acquired photographed value becomes the photographed value of the grid point A. Upon acquiring the photographed value, the correction control unit 163A converts the acquired photographed value of the grid point A into a value (XYZ value) in the XYZ color system. The photographed value (XYZ value) of the lattice point A becomes a target color.

  Next, the correction control unit 163A selects one grid point on the pattern image projected on the second projection area 142 from the second captured image data (Step S18). The grid point to be selected is arbitrary, but in this processing flow, it is assumed that the correction control unit 163A selects a grid point B (second position) located in the middle of the pattern image data shown in FIG.

Next, the correction control unit 163A selects the fourth captured image data of the target color and gradation, and specifies the position of the grid point B in the selected fourth captured image data. The position of the grid point B can be specified by comparing the second captured image data with the fourth captured image data.
When the position of the grid point B in the fourth captured image data is specified, the correction control unit 163A acquires the captured value of the fourth captured image data at the specified position (Step S19). The acquired photographed value becomes the photographed value of the grid point B. Upon acquiring the photographed value, the correction control unit 163A converts the acquired photographed value of the grid point B into a value (XYZ value) in the XYZ color system.
Next, the correction control unit 163A calculates a correction value (first correction data) for correcting the RGB ratio of the image data so that the XYZ value of the grid point B becomes the XYZ value of the grid point A (step S20). .

FIG. 7 is a diagram showing a change in photographed value of photographed image data (third and fourth photographed image data) photographed by the photographing unit 140A for each gradation. The vertical axis of FIG. 7 shows the values (XYZ values) of the photographed values in the XYZ color system, and the horizontal axis shows the gradation values.
The correction control unit 163A calculates a correction value for correcting the XYZ value of the grid point B to the XYZ value of the grid point A. In FIG. 7, the X value of the XYZ values of the grid point A is represented as Xa, and the gradation value when the X value is Xa is represented as “M”. Further, the X value of the XYZ values of the grid point B is represented as Xb, and the gradation value when the X value is Xb is “N”. The correction control unit 163A calculates a difference (M−N) between the gradation value “M” and the gradation value “N” as a correction value for correcting the X value of the grid point B. The correction control unit 163A similarly calculates correction values for the Y value and the Z value.
In addition, the correction control unit 163A changes the target color and gradation, and similarly obtains correction values of the X value, the Y value, and the Z value for all other colors and all gradations.

Further, the correction value calculated by the correction control unit 163A in the flow of S16 to S20 shown in FIG. 4 is a correction value in the gradation of the adjustment image projected on the screen SC. The correction control unit 163A obtains a correction value of a gradation other than the calculated gradation by an interpolation operation based on the calculated gradation correction value. After calculating the correction value, the correction control unit 163A transmits the calculated correction value to the projector 100B.
When receiving the correction value from projector 100A, control unit 160B of projector 100B sets the received correction value to a correction value for correcting all grid points of second projection area 142. Note that the process of calculating the correction value of the gradation other than the gradation of the adjustment image may be performed by the projector 100B.

As described above, in the first embodiment, the imaging unit 140A of the projector 100A captures an image of the first projection area 141 and a part of the second projection area 142. Based on the photographed image data photographed by the photographing unit 140A, the photographed values of the lattice points of the first projection area 141 and the photographed values of some lattice points of the second projection area 142 are calculated. A correction value for correcting the photographed value of the lattice point to the photographed value of the lattice point of the first projection area 141 is calculated.
Therefore, based on the photographed image data photographed by the photographing unit 140A, the photographed values of some of the grid points of the first projection area 141 and the second projection area 142 are calculated, and the grid values of some of the grid points of the second projection area 142 are calculated. It is possible to calculate a correction value for correcting the photographed value of the point to the photographed value of the lattice point of the first projection area 141. For this reason, an error included in the correction value can be reduced as compared with a case where the correction value is calculated based on the image data captured by the plurality of image capturing units.

[Second embodiment]
The configuration of the image projection system 1 of the second embodiment is the same as that of the first embodiment shown in FIGS. Therefore, description of the configuration of the image projection system 1 according to the second embodiment will be omitted.
In the second embodiment, the chromaticity (hue and saturation) of the image projected by the projector 100A on the first projection area 141 is not uniform, and the chromaticity of the image projected by the projector 100B on the second projection area 142 is not uniform. This is an embodiment in the case where there is not any. That is, the chromaticity of the image drawn on the liquid crystal panel of the light modulation device 112A of the projector 100A is not uniform, and the chromaticity of the image drawn on the liquid crystal panel of the light modulation device 112B of the projector 100B is not uniform.

FIG. 8 is a flowchart illustrating the operation of the projectors 100A and 100B of the second embodiment.
In the present embodiment, the processing is performed according to the steps S1 to S15 illustrated in FIG. 3, and then the processing is performed according to the flow illustrated in FIG.
In the processing flow of steps S1 to S15 shown in FIG. 3, the second embodiment is different from the first embodiment in that, in step S6, when the projector 100B projects the pattern image on the second projection area 142, in step S7, The first embodiment differs from the first embodiment in that the imaging unit 140A of the projector 100A and the imaging unit 140B of the projector 100B perform imaging and generate captured image data.
The captured image data generated by the imaging unit 140A is the above-described second captured image data, and the captured image data generated by the imaging unit 140B is hereinafter referred to as fifth captured image data. The correction control unit 163B of the projector 100B transmits the generated fifth captured image data to the projector 100A.
FIG. 9 shows the fifth captured image data.

Further, in step S12, when the projector 100B projects the adjustment image onto the second projection area 142, in step S13, the photographing unit 140A of the projector 100A and the photographing unit 140B of the projector 100B perform photographing to generate photographed image data. This is different from the first embodiment.
The captured image data generated by the imaging unit 140A is the above-described fourth captured image data, and the captured image data generated by the imaging unit 140B is referred to as sixth captured image data (third captured image).
The correction control unit 163B of the projector 100B transmits the generated sixth captured image data to the projector 100A.

  The correction control unit 163A selects a grid point serving as a reference for chromaticity correction from the pattern image data (step S31). The selected grid point is referred to as grid point A as in the first embodiment. The grid point A may be any grid point as long as it is a grid point on the pattern image data. In this processing flow, the grid point located at the center of the pattern image data is grid point A (see FIG. ) See)). The grid point A is a grid point serving as a reference for chromaticity correction, and the XYZ values of the grid point A are set as target values, and the XYZ values of other grid points projected on the first projection area 141 are set as target values. Correction processing is performed as described above.

The correction control unit 163A selects a target color and gradation, and selects third captured image data of the selected color and gradation. The correction control unit 163A specifies the position of each grid point in the selected third captured image data with reference to the correspondence table (Step S32). The grid points in the third captured image data are the grid points of the first projection area 141.
Next, the correction control unit 163A acquires a photographed value of the third photographed image data at the position of each specified lattice point. Upon acquiring the photographed values, the correction control unit 163A converts the acquired photographed values of each grid point into values in the XYZ color system (XYZ values).

  Next, the correction control unit 163A calculates a correction value for correcting the XYZ values of the grid points other than the grid point A, which are the grid points of the first projection area 141, to the XYZ values of the grid point A (steps). S33). The correction value calculated for each grid point is called a first correction value.

  Next, the correction control unit 163A selects one grid point from the grid points of the second projection area 142 reflected in the second captured image data (Step S34). The selected grid point is referred to as a grid point B (predetermined point) as in the above-described embodiment (see FIG. 6B). The selected grid point B may be any grid point as long as it is a grid point of the second projection area 142 shown in the second captured image data.

Next, the correction control unit 163A calculates a second correction value (Step S35). The second correction value is a correction value at the lattice point B. The second correction value is a correction value for correcting the XYZ value of grid point B to the XYZ value of grid point A.
The correction control unit 163A first selects the fourth captured image data obtained by capturing the selected color and gradation adjustment image. The correction control unit 163A compares the selected fourth captured image data with the second captured image data, and specifies the position of the grid point B in the fourth captured image data. The fourth captured image data is image data obtained by projecting the adjustment image onto the second projection area 142 and capturing the image by the capturing unit 140A of the projector 100A. The second captured image data is image data that is obtained by projecting a pattern image onto the second projection area 142 and photographing the image by the photographing unit 140A of the projector 100A. The correction control unit 163A acquires the photographed value of the fourth photographed image data at the specified position. This photographed value becomes the photographed value of the grid point B.
Next, the correction control unit 163A converts the photographed value of the grid point B into XYZ values.

Next, the correction control unit 163A selects, from the captured image data acquired from the projector 100B, sixth captured image data obtained by capturing the selected gradation and color adjustment image for which a correction value is to be generated.
Next, the correction control unit 163A specifies the position of each grid point of the second projection area 142 in the sixth captured image data (Step S36). The correction control unit 163A specifies the position of each grid point of the second projection area 142 in the sixth captured image data by comparing the sixth captured image data with the fifth captured image data. The sixth captured image data is image data obtained by projecting an adjustment image onto the second projection area 142 and photographing the image by the photographing unit 140B of the projector 100B. The fifth captured image data is image data that is obtained by projecting a pattern image onto the second projection area 142 and capturing an image using the image capturing unit 140B of the projector 100B.
Next, the correction control unit 163A acquires the photographed value of the sixth photographed image data at each grid point of the specified second projection area 142. Upon acquiring the photographed values, the correction control unit 163A converts the acquired photographed values of each grid point into values in the XYZ color system (XYZ values).

  Next, the correction control unit 163A further specifies the grid point B from the specified grid points of the second projection area 142, and corrects the XYZ values of the specified grid point B based on the second correction value. (Step S37). The correction control unit 163A calculates a correction amount based on the second correction value, and adds the calculated correction amount to the XYZ value of the grid point B. The correction amount based on the second correction value will be described with reference to FIG. The XYZ value of the grid point B to which the correction amount based on the second correction value has been added is the correction target value in the second projection area 142.

  Next, the correction control unit 163A corrects the XYZ values of each of the grid points (plural locations) other than the grid point B in the second projection area 142 to the XYZ values of the grid point B (predetermined point) that is the target value. A correction value to be performed (hereinafter, referred to as a third correction value (second correction data)) is calculated (step S38). After calculating the third correction value for correcting the chromaticity of each grid point of the second projection area 142, the correction control unit 163A transmits the calculated second and third correction values to the projector 100B (Step S39). .

FIG. 10 is a diagram illustrating the principle of the second embodiment. In FIG. 10, the vertical axis indicates the XYZ values, and the horizontal axis indicates the positions of the lattice points.
In the present embodiment, unlike the first embodiment described above, two photographing units, a photographing unit 140A of the projector 100A and a photographing unit 140B of the projector 100B, are used as photographing units for generating photographed image data.
If there is an individual difference in sensitivity between the camera provided in the image capturing unit 140A and the camera provided in the image capturing unit 140B, the captured value calculated based on the generated captured image data includes an error, and the image projected by the projector 100B In some cases, the chromaticity cannot be accurately adjusted to the chromaticity of the image projected by the projector 100A.

In FIG. 10, the XYZ values of the grid point A calculated from the captured image data of the capturing unit 140A are assumed to be the XYZ values of the point a (X ₁ , Y ₁ , Z ₁ ). The XYZ values (X ₁ , Y ₁ , Z ₁ ) of the grid point A are the target values in the first projection area 141.
Further, the XYZ values of the grid point B calculated from the captured image data of the capturing unit 140A are set as the XYZ values (X ₂ , Y ₂ , Z ₂ ) of the point b. A gradation value calculated based on a difference between an XYZ value (X ₁ , Y ₁ , Z ₁ ) of the lattice point A, which is a target value, and an XYZ value (X ₂ , Y ₂ , Z ₂ ) of the lattice point B. Is the second correction value described above. The correction amount of the XYZ values based on the second correction value for correcting the gradation value is set to α.
Incidentally, in FIG. 10, the XYZ values of the point c is, XYZ values of the grid points _{B (X 2, Y 2,} Z 2) , and corrected XYZ value by the correction amount α based on the second correction value _(X 1, Y ₁ , Z ₁ ).

Further, the XYZ values of the grid point B calculated from the image data of the image capturing unit 140B are defined as the XYZ values (X ₃ , Y ₃ , Z ₃ ) of the point d. The correction control unit 163A adds the correction amount α based on the second correction value to (X ₃ , Y ₃ , Z ₃ ) that is the XYZ value of the grid point B, and calculates the XYZ value obtained by adding The target value in the second projection area 142 is set. A value obtained by adding the correction amount α based on the second correction value to the XYZ value (X ₃ , Y ₃ , Z ₃ ) is defined as the XYZ value (X ₄ , Y ₄ , Z ₄ ) of the point e.
The correction control unit 163A corrects the XYZ values of the other grid points of the second projection area 142 using the XYZ values (X ₄ , Y ₄ , Z ₄ ) of the point e as target values.

For example, it is assumed that the XYZ value of the grid point C shown in FIG. 9 is the XYZ value (X ₅ , Y ₅ , Z ₅ ) of the point f shown in FIG.
Correction control unit 163A, first, the difference in XYZ values of the grid point C of target _{(X 5, Y 5, Z} 5), serving as a reference XYZ values of the grid points B and _{(X 3, Y 3, Z} 3) Ask for. The obtained difference is set as a correction amount β. Next, the correction control unit 163A adds the obtained correction amount β and the correction amount α based on the second correction value. The added value is the correction amount at the lattice point C.

In the above description, the case where the chromaticity is corrected has been described, but the luminance of the image data may be corrected in addition to the chromaticity. When performing luminance correction, a target point may be set by selecting a lattice point of the first projection area 141 and a lattice point of the second projection area 142 and comparing the luminance of the lattice points.
For example, the correction control unit 163A selects a grid point A (see FIG. 6) located at the center of the first projection area 141 as a grid point of the first projection area 141, and It is assumed that a grid point C (see FIG. 9) located at the center of the second projection area 142 is selected. The XYZ values of the grid points A and _{(X A, Y A, Z} A), the XYZ values of the grid points C and _{(X C, Y C, Z} C).
Correction control unit 163A compares the luminance value _{Y C} of the luminance values _{Y A} and the lattice point C of the grid points _A, Y A <case _{Y C,} the target value of the first projection region 141 _(X A, Y _a, and _{Z a).}
On the other _hand, in the case of Y A> _{Y C,} the correction control unit 163A _is a target value such that _{Y A = Y C (X A} , Y A, Z A) to, by integrating the ratio of _{Y A} and _{Y C} The value (X _A , Y _A , Z _A ) × (Y _C / Y _A ) = (X _A (Y _C / Y _A ), Y _c , Z _A (Y _C / Y _A )) is assigned to the first projection area 141. Is the new target value.

  However, in the actual projector 100, brightness unevenness occurs in which brightness decreases around the liquid crystal panel due to the characteristics of the light source. In the projector 100 (at least one of the projectors 100A and 100B) in which luminance unevenness occurs, when correcting the luminance to be a uniform value in the plane of the liquid crystal panel, the luminance target value is set to the first projection area 141 and the first projection area 141. The brightness of the grid point having the smallest value among the brightnesses of all the grid points in the second projection area 142 may be set.

However, if the target value of the luminance is set to the luminance of the lattice point having the smallest value among the luminances of all the lattice points of the first projection area 141 and the second projection area 142, the luminance of the image projected on the screen SC is reduced. In some cases, it can be significantly reduced. Therefore, in order to prevent a significant decrease in luminance, the chromaticity may be corrected without changing the luminance.
For example, for a grid point is W, the current brightness and Y _{is W,} the luminance of the central grid point A in the first projection region 141 which is a target value of the first projection region 141 and Y _A.
Correction control unit 163A includes, XYZ values of the grid points A, which is a target value _{(X A,} Y A, _{Z A),} the integration ratio between the luminance value _{Y W} of the luminance values _{Y A} and the lattice point W of the grid points A Then, (X _A , Y _A , Z _A ) × (Y _W / Y _A ) = ((X _A (Y _W / Y _A ), Y _W , Z _A (Y _W / Y _A )) The target value is W. The correction control unit 163A calculates target values for all other grid points.

As described above, in the second embodiment, in the projector 100A, the photographed values of the grid points of the second projection area 142 that can be photographed by the photographing unit 140A, and the photographed values are stored in the target grid set in the first projection area 141 A correction value to be corrected to the photographing value of the point is calculated from the photographed image data of the photographing unit 140A, and the calculated correction value is transmitted to the projector 100B.
The projector 100B calculates, from the captured image data of the image capturing unit 140B, the captured value of the grid point for which the projector 100A has calculated the correction value, and corrects the captured value with the correction value transmitted from the projector 100A. Further, the projector 100B corrects the photographed value of the grid point in the second projection area 142 using the corrected photographed value of the grid point as a target value. Therefore, since the data transmitted from the projector 100A to the projector 100B is only the correction value for correcting the photographed value of the lattice point, even when the photographed value is calculated using the plurality of photographing units 140A and 140B, Without being affected by the sensitivity difference between the imaging units 140A and 140B, it is possible to correct the imaging value of each grid point of the second projection area 142 to be the target value set at the grid point of the first projection area 141. it can.

[Modification 1]
In the above-described second embodiment, a case has been described in which an image is projected by the two projectors 100A and 100B, but the number of projectors 100 is not limited to two.
FIG. 11 is a diagram for explaining a case where the chromaticity of an image projected by four projectors is corrected. Operation when four projectors 100A, 100B, 100C and 100D are arranged adjacent to each other in the horizontal direction (horizontal direction) with reference to FIG. 11 and the chromaticity of the image projected by each projector 100 is corrected. Will be described. In this embodiment, similarly to the above-described first and second embodiments, the projector 100A as the master machine acquires the captured image data generated by the other projectors 100B, 100C, and 100D, and performs the second to the second. The correction value of each grid point of the four projection areas 142, 143, 144 is calculated.

  In FIG. 11, it is assumed that the projector 100A projects an image on the first projection area 141, and the shooting range of the shooting unit 140A is a shooting range 145. The projector 100B projects an image on the second projection area 142, and the photographing range of the photographing unit 140B is the photographing range 146. It is assumed that the projector 100C projects an image on the third projection area 143, and the shooting range of the shooting unit 140C is a shooting range 147. It is assumed that the projector 100D projects an image on the fourth projection area 144, and the shooting range of the shooting unit 140D is a shooting range 148.

  The correction control unit 163A of the projector 100A corrects the photographed value (XYZ value) of the lattice point Q into the photographed value (XYZ value) of the central lattice point P of the first projection area 141 according to the above-described procedure. Correction value q) is calculated. The photographed value (XYZ value) of the lattice point P and the photographed value (XYZ value) of the lattice point Q are values calculated from photographed image data generated by photographing the photographing range 145 by the photographing unit 140A of the projector 100A. The grid point Q is a grid point of the second projection area 142 included in the shooting range 145 of the projector 100A and the shooting range 146 of the projector 100B. Further, the correction control unit 163A calculates the correction value q at the lattice point Q with each gradation set in the above-described adjustment image.

  Next, the correction control unit 163A corrects the calculated grid point Q by calculating the shooting value (XYZ value) of the grid point Q obtained from the shot image data generated by shooting the shooting range 146 by the shooting unit 140B of the projector 100B. Correction is made by the value q. Next, the correction control unit 163A sets a correction value (denoted as a correction value r) for correcting the shooting value (XYZ value) of the grid point R using the corrected shooting value (XYZ value) of the grid point Q as a target value. calculate. The grid point R is a grid point of the second projection area 142 included in the shooting range 146 of the projector 100B and the shooting range 147 of the projector 100C. The photographed value (XYZ value) of the lattice point R is a value calculated from photographed image data of the photographing range 146 photographed by the photographing unit 140B of the projector 100B. The correction control unit 163A calculates the correction value r at the lattice point R with each gradation set in the above-described adjustment image.

  Next, the correction control unit 163A corrects the photographed value (XYZ value) of the lattice point R obtained from the photographed image data generated by photographing the photographing range 147 by the photographing unit 140C of the projector 100C by correcting the calculated lattice point R. Correction is made by the value r. Next, the correction control unit 163A sets a correction value (denoted as a correction value s) for correcting the shooting value (XYZ value) of the grid point S using the corrected shooting value (XYZ value) of the grid point R as a target value. calculate. The grid point S is a grid point of the third projection area 143 included in the shooting range 146 of the projector 100B and the shooting range 147 of the projector 100C. The photographed value (XYZ value) of the lattice point S is a value calculated from photographed image data of the photographing range 147 photographed by the photographing unit 140C of the projector 100C. The correction control unit 163A calculates the correction value s at the lattice point S with each gradation set in the above-described adjustment image.

The correction control unit 163A calculates the correction value t of the grid point T of the third projection area 143 and the correction value u of the grid point U of the fourth projection area 144 by the same procedure.
Further, when calculating the correction value q of the grid point Q of the second projection area 142, the correction control unit 163A calculates the correction value q based on the calculated correction value q and the captured image data generated by the capturing unit 140B of the projector 100B. The correction values of the other grid points of the second projection area 142 are calculated. Further, the correction control unit 163A similarly calculates correction values of other grid points of the third projection area 143 and correction values of other grid points of the fourth projection area 144.

  The correction control unit 163A transmits the calculated correction value of each grid point of the second projection area 142 to the projector 100B. Further, the correction control unit 163A transmits the calculated correction value of each grid point of the third projection area 143 to the projector 100C. Further, the correction control unit 163A transmits the calculated correction value of each grid point of the fourth projection area 144 to the projector 100D.

In the first modification, the case where the correction control unit 163A of the projector 100A calculates the correction value of each grid point has been described. However, the correction value of the grid point R of the second projection area 142 is calculated by the projector 100B. You may. Further, the correction value of the grid point T of the third projection area 143 may be calculated by the projector 100C.
For example, when calculating the correction value q of the lattice point Q, the correction control unit 163A of the projector 100A transmits the calculated correction value q to the projector 100B.
The correction control unit 163B of the projector 100B corrects the photographed value (XYZ value) of the lattice point Q obtained from the photographed image data generated by photographing the photographing range 146 by the photographing unit 140B to the lattice point Q received from the projector 100A. Correction is made by the value q.
Further, the correction control unit 163B calculates a correction value r for correcting the shooting value (XYZ value) of the grid point R using the corrected shooting value (XYZ value) of the grid point Q as a target value. The correction control unit 163B transmits the calculated correction value r to the projector 100C.
Hereinafter, similarly, the correction control unit 163C of the projector 100C receives, from the projector 100B, the shooting value (XYZ value) of the grid point R obtained from the shooting image data generated by shooting the shooting range 147 by the shooting unit 140C. Is corrected by the correction value r of the grid point R thus obtained. Further, the correction control unit 163C calculates a correction value s for correcting the photographed value (XYZ value) of the grid point S using the corrected photographed value (XYZ value) of the grid point R as a target value. The correction control unit 163C transmits the calculated correction value s to the projector 100D.

[Modification 2]
In the first and second embodiments described above, the projector 100A, which is the master device, calculates the correction value of each grid point of the first projection area 141 and the second projection area 142.
In the second modification, the projector 100B calculates the correction value of each grid point of the second projection area 142.
After calculating the correction value of each grid point of the first projection area 141, the correction control unit 163A of the projector 100A sends the correction value of the grid point of the first projection area 141 that can be captured by the imaging unit 140B of the projector 100B to the projector 100B. Send.

FIG. 12 is a diagram for explaining the operation of the modification.
The correction control unit 163A of the projector 100A calculates a correction value (hereinafter, referred to as a correction value j) of a grid point (for example, a grid point J shown in FIG. 12) which is a grid point that can be photographed by the photographing unit 140B of the projector 100B. Then, information that can specify the position of the lattice point (the position of the lattice point J) is transmitted to the projector 100B. When the position of the grid point at which the projector 100A transmits the correction value to the projector 100B is a position set in advance, information that can specify the position of the grid point (the position of the grid point J) is transmitted to the projector 100B. do not have to. The information that can specify the position of the grid point is, for example, information that specifies the middle grid point in the rightmost column among the grid points projected on the first projection area 141.

Upon receiving the correction value j of the lattice point J, the correction control unit 163B of the projector 100B receives the photographed value (XYZ value) of the lattice point J generated from the photographed image data of the photographing range 146 by the photographing unit 140B. The correction is performed using the correction value j of the lattice point J.
In addition, the correction control unit 163B of the projector 100B uses the corrected shooting value (XYZ value) of the grid point J as a target value in the second projection area 142, and sets each grid point of the second projection area 142 (for example, in FIG. A correction value for correcting the photographed value of the indicated grid point K) is calculated.

Further, the correction control unit 163A of the projector 100A converts the photographing value (XYZ value) of the lattice point J calculated from the photographed image data photographed by the photographing unit 140A into the second correction data in addition to the correction value j at the lattice point J. May be transmitted to the projector 100B.
In this case, the correction control unit 163B of the projector 100B determines the photographed value (XYZ value) of the grid point J generated from the photographed image data photographed by the photographing unit 140B and the photographed value (XYZ value) of the grid point J received from the projector 100A. ) (Hereinafter referred to as a difference value). The correction control unit 163B recognizes the calculated difference value as a difference in sensitivity between the camera of the imaging unit 140A and the camera of the imaging unit 140B.

Next, the correction control unit 163B adds the difference value and the correction amount based on the correction value j to the photographed value (XYZ value) of the lattice point J generated from the photographed image data photographed by the photographing unit 140B. The added value becomes the same value as the photographed value (XYZ value) obtained by photographing the central grid point A of the first projection area 141 shown in FIG. 6A by the photographing unit 140A of the projector 100A. .
The correction control unit 163B sets the photographed value (XYZ value) of each lattice point of the second projection area 142 generated from the photographed image data photographed by the photographing unit 140B with the calculated photographed value (XYZ value) of the lattice point J as the target value. ) Is corrected.

As described above, the first and second embodiments according to the image projection system and the control method of the image projection system include the projectors 100A and 100B.
The projector 100A includes a projection optical system 113A that projects an adjustment image, and a photographing unit 140A that captures a range including at least a part of the projected adjustment image and at least a part of the adjustment image projected by the projector 100B. And The projector 100B includes a projection optical system 113B (second projection unit) that projects an adjustment image.
The image projection system 1 determines a target color based on third photographed image data obtained by photographing at least a part of the adjustment image projected by the projection optical system 113A by the photographing unit 140A.
Further, the image projection system 1 changes the color of the image projected by the projector 100B based on the fourth captured image data obtained by capturing at least a part of the adjustment image projected by the projection optical system 113B by the capturing unit 140A. Is determined.
Therefore, when an image is projected by the plurality of projectors 100A and 100B, it is possible to accurately correct the image projected by each of the projectors 100A and 100B to a target color.

  Further, the image projection system 1 sets the photographing value of the grid point A of the fourth photographed image data to the photographing value of the Thus, a correction value for correcting the projection image in the projector 100B is obtained. Therefore, in the projector 100B, it is possible to correct the photographed value at the position of the grid point B of the projected image to be the target color.

Also, the projector 100A sets the shooting value at the position of the grid point A in the fourth shot image data to the shooting value at the position of the grid point A, using the shooting value at the position of the grid point A in the third shooting image data as the target color. Is provided with a correction control unit 163A that calculates a correction value for correcting a projection image in the projector 100B. Further, projector 100A includes a communication unit 175A that transmits the correction value calculated by correction control unit 163A to projector 100B.
Therefore, the correction value can be calculated in the projector 100A, and the calculated correction value can be transmitted to the projector 100B.

  The correction value is data for correcting the color at the position of the grid point B of the fourth captured image data to a target color, and the projector 100B converts at least a part of the adjustment image projected by the projection optical system 113B. The camera includes a photographing unit 140B for photographing the included range. The projector 100B changes the color of the positions of the plurality of grid points of the adjustment image based on the sixth captured image data obtained by capturing at least a part of the adjustment image projected by the projection optical system 113B by the imaging unit 140B. A third correction value for correcting the color at the position of the lattice point B of the four captured image data is obtained. Therefore, based on the sixth photographed image data obtained by photographing at least a part of the adjustment image projected by the projection optical system 113B by the photographing unit 140B, the colors at the positions of the plurality of grid points of the adjustment image are changed to the fourth photographed image data. A third correction value for correcting the color at the position of the lattice point B can be obtained.

  Further, the correction control unit 163A of the projector 100A is configured to correct the color of the positions of the plurality of grid points of the adjustment image to the color of the grid point B based on the sixth captured image data received from the projector 100B. Ask for. Therefore, the third correction value can be obtained in the projector 100A based on the sixth captured image data captured by the projector 100B.

The above-described first and second embodiments and modifications thereof are preferred embodiments of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.
For example, in the above-described first and second embodiments, the projector 100A located on the left side is set as the master unit, but the projector 100 set as the master unit is not limited to the projector 100A located on the left side.

In the above-described first and second embodiments, the center of the first projection area 141 of the projector 100A (that is, the center of the liquid crystal panel) is set as the target value of the chromaticity and the luminance. Other parts or the projection area of the projector 100 other than the projector 100A as the master machine may be set as the target value of at least one of the chromaticity and the luminance. Alternatively, a preset target value may be stored in the storage unit 170A, and a value read from the storage unit 170A may be set as the target value when adjusting chromaticity or luminance. Further, the user operates the operation panel 131A or the remote controller 5A to cause the projector 100A to photograph the screen SC by the photographing unit 140A, and sets at least one target value of the chromaticity and the luminance based on the photographed image data. Then, the set target value can be stored in the storage unit 170A.
Further, different chromaticity and luminance target values may be set according to the position of the liquid crystal panel. For example, a range in which images projected from the plurality of projectors 100 are overlapped calculates a target value from image data captured by the image capturing unit 140A, and a range other than the target value stored in the storage unit 170A is a target value. May be used.

Hereinafter, the chromaticity of each grid point of the first projection area 141 and the second projection area 142 is set to the target value, with the chromaticity value preset by the user operating the operation panel 131A or the remote controller 5A as the target value. The case of correction will be described. The chromaticity target value set in advance by the user is stored in the storage unit 170A.
The correction control unit 163A of the projector 100A instructs the projection control unit 161A to project the adjustment image on the first projection area 141 of the screen SC, and instructs the shooting control unit 162A to shoot the projected adjustment image. Third captured image data is generated.
In addition, the correction control unit 163A instructs the projector 100B to project the adjustment image on the second projection area 142, and instructs the imaging control unit 162A to shoot the projected adjustment image to obtain the fourth captured image data. Is generated.

The correction control unit 163A performs correction based on the generated third captured image data so that the captured value (XYZ value) of each grid point of the first projection area 141 becomes the target value stored in the storage unit 170A. A correction value (third correction data) is calculated for each. Further, based on the generated fourth captured image data, the correction control unit 163A changes the captured value (XYZ value) of the grid point (for example, the grid point B illustrated in FIG. 6B) of the second projection area 142. , A correction value (fourth correction data) to be corrected to be the target value stored in the storage unit 170A.
The correction control unit 163A calculates the correction value of each grid point of the first projection area 141 and the correction value of the grid point of the second projection area 142 for all RGB colors and all preset gradations. I do. Further, the correction control unit 163A also calculates a correction value of a gradation other than the gradation set in advance by an interpolation operation based on the calculated correction value of the gradation. The correction control unit 163A corrects the shooting value (XYZ value) of each grid point of the first projection area 141 using the calculated correction value of each grid point of the first projection area 141. Further, the correction control unit 163A transmits the calculated correction value of the grid point of the second projection area 142 to the projector 100B.

  The correction control unit 163B of the projector 100B sets, based on the correction values received from the projector 100A, the correction values for correcting the shooting values (XYZ values) of the respective grid points of the second projection area 142 shot by the shooting unit 140B as RGB. Are calculated for all the colors and all the preset gradations. Further, the correction control unit 163B also calculates the correction value of the gradation other than the gradation set in advance by the interpolation calculation based on the calculated correction value of the gradation. The correction control unit 163B sets each calculated correction value as a correction value of each grid point of the second projection area 142. Therefore, it is possible to accurately correct an image projected by each of the projectors 100A and 100B to a target color.

Further, the correction control unit 163A of the projector 100A may acquire the fifth captured image data captured by the capturing unit 140B from the projector 100B and calculate a correction value based on the acquired fifth captured image data. The correction control unit 163A corrects the photographed value (XYZ value) of each grid point of the second projection area 142 based on the fifth photographed image data so that the photographed value (XYZ value) becomes the target value stored in the storage unit 170A. The fourth correction data) is calculated for all RGB colors and all preset gradations. Further, the correction control unit 163A also calculates a correction value of a gradation other than the calculated gradation by an interpolation operation based on the calculated gradation correction value. After calculating the correction value, the correction control unit 163A transmits the calculated correction value to the projector 100B.
The correction control unit 163B of the projector 100B sets the correction value received from the projector 100A as the correction value of each grid point of the second projection area 142. Therefore, it is possible to accurately correct an image projected by each of the projectors 100A and 100B to a target color.

  In the first and second embodiments, the projectors 100A and 100B have been described as liquid crystal projectors using a transmissive liquid crystal panel, but may be projectors using a reflective liquid crystal panel or a digital mirror device.

  Further, each functional unit of the projectors 100A and 100B shown in FIG. 2 shows a functional configuration realized by cooperation of hardware and software, and a specific mounting form is not particularly limited. Therefore, it is not always necessary to individually implement hardware corresponding to each functional unit, and it is of course possible to adopt a configuration in which one processor executes a program to realize the functions of a plurality of functional units. Further, in the above embodiment, some of the functions realized by software may be realized by hardware, or some of the functions realized by hardware may be realized by software.

  5A: remote control, 100 (100A (first projector), 100B (second projector), 100C, 100D): projector, 110A, 110B: display unit, 111A, 111B: light source unit, 112A, 112B: light modulator, 113A .., 113B: Projection optical system (first projection unit, second projection unit), 121A, 121B: Light source drive unit, 122A, 122B: Light modulator drive unit, 131A, 131B: Operation panel, 132A, 132B: Remote control light-receiving unit ... 133A, 133B ... processing unit, 140A, 140B ... shooting unit (first shooting unit, second shooting unit), 151A, 151B ... image input unit, 152A, 152B ... image processing unit, 155A, 155B ... frame memory, 160A , 160B ... control unit, 161A, 161B ... projection control unit, 162A, 1 2B: imaging control unit, 163A, 163B: correction control unit (first calculation unit, second calculation unit), 170A, 170B: storage unit, 175A, 175B: communication unit (transmission unit), 180A, 180B: internal bus, 200: Image supply device.

Claims (15)

An image projection system including a first projector and a second projector,
The first projector includes:
A first projection unit that projects a first image;
A first image capturing unit configured to capture an area including at least a part of the first image projected by the first projector and at least a part of a second image projected by the second projector,
The second projector includes a second projection unit that projects the second image,
A second correcting unit that corrects a color of a projection image of the second projector to a target color based on a second captured image obtained by capturing at least a part of the second image projected by the second projection unit by the first capturing unit. (1) obtaining correction data;
An image projection system characterized by the above-mentioned.   The second captured image is obtained by setting a captured value at a first position on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first captured unit as the target color. 2. The first correction data for correcting the projection image in the second projector so that the photographed value of the second position above becomes the photographed value of the first position. 3. The image projection system according to any one of the preceding claims. The first projector includes:
The second captured image is obtained by setting a captured value at a first position on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first captured unit as the target color. A first calculation unit that calculates the first correction data for correcting the projection image so that the shooting value at the second position above becomes the shooting value at the first position;
A transmission unit that transmits the first correction data calculated by the first calculation unit to the second projector;
The image projection system according to claim 1, further comprising: The first correction data is data for correcting a color at a predetermined point in the second captured image to the target color,
The second projector includes a second imaging unit that captures a range including at least a part of the second image projected by the second projection unit,
Based on a third captured image obtained by capturing at least a part of the second image projected by the second projection unit, the second imaging unit changes colors of a plurality of locations in the second image to the predetermined point. 2. The image projection system according to claim 1, wherein second correction data for correcting the color is obtained.   The first projector obtains the second correction data for correcting the colors of the plurality of locations in the second image to the colors of the predetermined points based on the third captured image received from the second projector. The image projection system according to claim 4, further comprising a second calculator. The first projector includes:
The second captured image is obtained by setting a captured value at a first position on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first captured unit as the target color. A first calculation unit that calculates the first correction data for correcting the second image in the second projector so that the shooting value of the second position above becomes the shooting value of the first position;
A transmission unit that transmits the first correction data calculated by the first calculation unit to the second projector,
The second projector, based on the first correction data received from the first projector, to obtain second correction data for correcting the colors of a plurality of locations in the second image to the colors of the predetermined points; The image projection system according to claim 4, wherein: An image projection system including a first projector and a second projector,
The first projector includes:
A first projection unit that projects a first image;
A first image capturing unit configured to capture an area including at least a part of the first image projected by the first projector and at least a part of a second image projected by the second projector,
The second projector includes a second projection unit that projects the second image,
Based on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first capturing unit, the color of the projected image of the first projector is set to a predetermined target. Find third correction data for correcting to color,
The color of the image projected by the second projector is corrected to the target color based on a second captured image obtained by capturing at least a part of the second image projected by the second projection unit by the first capturing unit. Obtaining fourth correction data;
An image projection system characterized by the above-mentioned. An image projection system including a first projector and a second projector,
The first projector includes:
A first projection unit that projects a first image;
A first image capturing unit configured to capture an area including at least a part of the first image projected by the first projector and at least a part of a second image projected by the second projector,
The second projector,
A second projection unit that projects the second image,
A second imaging unit that captures at least a part of the first image projected by the first projection unit and a range including at least a part of the second image projected by the second projector,
Setting a target color based on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first capturing unit;
The color of the image projected by the second projector is corrected to the target color based on a second captured image obtained by capturing at least a part of the second image projected by the second projection unit by the second capturing unit. Obtaining first correction data;
An image projection system characterized by the above-mentioned. An image projection system including a first projector and a second projector,
The first projector includes:
A first projection unit that projects a first image;
A first photographing unit,
The second projector,
A second projection unit that projects a second image;
A second photographing unit,
Based on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first capturing unit, the color of the projected image of the first projector is set to a predetermined target. Find third correction data for correcting to color,
The first captured image, a second captured image of at least a part of the first image captured by the second capturing unit, a third captured image of the second image captured by the second capturing unit, Obtaining fourth correction data for correcting a color of a projection image of the second projector based on the third correction data;
An image projection system characterized by the above-mentioned. A projection unit that projects the first image,
A photographing unit that photographs a range including at least a part of the first image projected by the projection unit and at least a part of a second image projected by another projector;
At least a part of the second image projected by the other projector is determined based on a first photographed image obtained by photographing at least a part of the first image projected by the projection part by the photographing part. A first calculation unit for obtaining first correction data for correcting a color of a projection image of the other projector to the target color based on a second captured image captured by the capturing unit;
A projector. A projection unit that projects the first image,
A photographing unit that photographs a range including at least a part of the first image projected by the projection unit and at least a part of a second image projected by another projector;
Based on a first captured image obtained by capturing at least a part of the first image projected by the projection unit by the capturing unit, the color of the projected image projected by the projection unit is set to a preset target color. A third correction data to be corrected is obtained, and based on a second captured image obtained by capturing at least a part of the second image projected by the other projector by the capturing unit, a color of the projected image of the other projector is determined. A first calculation unit for obtaining fourth correction data for correcting to a target color;
A projector. A method for controlling an image projection system including a first projector and a second projector,
Photographing a range including at least a part of the first image projected by the first projector and at least a part of the second image projected by the second projector by a first photographing unit of the first projector; ,
Determining a target color based on a first captured image obtained by capturing at least a part of the first image by the first capturing unit of the first projector;
First correction data for correcting a color of a projection image of the second projector to the target color based on a second captured image obtained by capturing at least a part of the second image by the first capturing unit of the first projector. And
And a control method of the image projection system. A method for controlling an image projection system including a first projector and a second projector,
A first photographing unit of the first projector and the second projector include a range including at least a part of the first image projected by the first projector and at least a part of the second image projected by the second projector. Photographing by a second photographing unit of
Determining a target color based on a first captured image obtained by capturing at least a part of the first image by the first capturing unit of the first projector;
A step of obtaining first correction data for correcting a color of a projected image of the second projector to the target color based on a second captured image obtained by capturing at least a part of the second image by the second capturing unit;
A method for controlling an image projection system, comprising:   The step of photographing alternately switches the projection of the first image by the first projector and the projection of the second image by the second projector, so that at least a part of the first image and the second 14. The method according to claim 12, wherein at least a part of the image is alternately photographed. A method for controlling an image projection system including a first projector and a second projector,
The color of the projection image of the first projector is changed to a preset target color based on a first image captured by the first imaging unit of the first projector, the first image projected by the first projector. Obtaining third correction data to be corrected;
A second correcting unit configured to correct a color of the image projected by the second projector to the target color based on a second captured image obtained by capturing at least a part of the second image projected by the second projector by the first capturing unit; (4) obtaining correction data;
Correcting the color of the projected image of the second projector based on the third captured image captured by the second capturing unit of the second projector and the fourth correction data,
A control method for an image projection system, comprising:

Images