JP2017129739A - Image projection system, projector, and image correction method - Google Patents

Abstract

An image projection system, a projector, and an image correction method capable of performing correction to make the quality of images projected by a plurality of projectors more uniform and more efficient are provided.
An image projection system (1) selects a first projection area and a second projection area based on a positional relationship of projection areas (10A to 10D) onto which images are projected by a plurality of projectors (100A, 100B, 100C, 100D). Based on the correction data, the projector 100 that obtains correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area, and projects the image on the second projection area. Thus, the image projected on the second projection area is corrected.
[Selection] Figure 1

Description

  The present invention relates to an image projection system, a projector, and an image correction method.

  2. Description of the Related Art Conventionally, a technique for displaying one large image by connecting images projected by a plurality of projectors is known. When an image is projected by a plurality of projectors, there may be a difference in the color or brightness of the image projected by each projector due to individual differences among the projectors. When these differences are conspicuous, the display quality is deteriorated. Therefore, a method of correcting so as to eliminate the difference between the projected images of a plurality of projectors has been proposed (see, for example, Patent Document 1). The image projection display device of Patent Document 1 sequentially projects images on a screen by a plurality of projectors, sequentially captures each captured image with a colorimetric system, and corrects the color difference between the projectors.

JP 2002-72359 A

As in the configuration described in Patent Document 1, conventionally, in order to make the display quality of the entire projected image uniform, it has been necessary to capture the entire projected image of a plurality of projectors. Further, if an attempt is made to correct the entire projected image without capturing it, the projected image will be partially corrected, and the state of the corrected image may vary.
The present invention has been made in view of the above circumstances, and an image projection system, a projector, and an image correction capable of performing correction to make the quality of images projected by a plurality of projectors more uniform and more efficient It aims to provide a method.

In order to achieve the above object, the present invention provides an image projection system including a plurality of projectors including a projecting unit that projects an image and a control device, wherein the control device is a projection region in which the plurality of projectors project an image. Based on the positional relationship, the first projection area and the second projection area are selected, and the image projected on the second projection area is corrected in accordance with the image projected on the first projection area. A control unit that obtains correction data to be corrected, and the projector that projects an image on the second projection area corrects an image projected by the projection unit based on the correction data obtained by the control device. And
According to this configuration, it is possible to select a projection area projected by a plurality of projectors based on the positional relationship between the projection areas, and perform correction to align the image quality. Thereby, variation in the quality of the corrected image can be suppressed, and the quality of the image projected by the plurality of projectors can be corrected more efficiently and uniformly.

In the image projection system according to the aspect of the invention, the control unit may set the correction order of the plurality of projection areas based on a positional relationship between the projection areas on which the plurality of projectors project images, and set the correction. According to the order, the first projection area and the second projection area lower than the first projection area are selected.
According to this configuration, the correction order is set for the projection area projected by the projector, and the projection area is selected according to the correction order to perform correction. For this reason, even if correction data is obtained and corrected for a part of the entire image projected by a plurality of projectors, variations in the quality of the corrected image can be suppressed, and the entire projected image can be corrected uniformly.

Moreover, this invention is a projector provided with the projection part which projects an image in the said image projection system, The said control part projects the image where the said control apparatus projects an image, and the said several projector projects an image The correction order is set based on a positional relationship among a plurality of the projection areas including the projection area to be performed.
According to this configuration, a part of the plurality of projectors operates as a control device, and correction data can be obtained.

In the image projection system according to the aspect of the invention, the control unit may set the correction order such that the projection area at the center or near the center of the plurality of projection areas is higher than the other projection areas. It is characterized by setting to.
According to this configuration, the entire projection area projected by the plurality of projectors can be corrected so as to match the projection area at the center or near the center.

In the image projection system according to the aspect of the invention, the control unit may make the projection area at the center or a position close to the center of the plurality of projection areas first in the correction order, and the correction order of the other projection areas. Is set based on the distance from the projection area at the beginning of the correction order.
According to this configuration, the entire projection area projected by the plurality of projectors can be corrected with reference to the center or a position close to the center.

In the image projection system according to the aspect of the invention, any one of the projectors may include an imaging unit that captures an area including at least a part of the first projection area and at least a part of the second projection area. The control unit captures a first captured image obtained by imaging the image projected on the first projection area by the imaging unit, and a second image obtained by imaging the image projected on the second projection area by the imaging unit. The correction data is obtained based on the captured image.
According to this configuration, it is possible to perform correction that matches the quality of the entire projection image of the plurality of projectors by using the imaging unit that captures a part of the entire projection image of the plurality of projectors.

In the image projection system according to the aspect of the invention, the control unit may determine a target color based on the first captured image, and may be an image projected on the second projection area based on the second captured image. The correction data for correcting the color to the target color is obtained.
According to this configuration, it is possible to perform correction to align the colors of the entire projection images of a plurality of projectors.

In the image projection system according to the aspect of the invention, the control unit may determine an imaging value at a first position in the first captured image as the target color, and an imaging value at a second position in the second captured image. The correction data for correcting the color to the target color is obtained.
According to this configuration, the color of the projection image of the projector can be corrected with high accuracy using the imaging unit that captures a part of the entire projection image of the plurality of projectors.

In order to achieve the above object, the present invention is a projector capable of communicating with a plurality of projectors, a projection unit that projects an image, an imaging unit that captures a projection area in which the projection unit projects an image, The first projection area and the second projection area based on a positional relationship of a plurality of projection areas including a projection area where the projection unit projects an image and a projection area where the plurality of projectors project an image. And a control unit for obtaining correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area, the correction data being the second The image is transmitted to the projector that projects an image on the projection area.
According to this configuration, it is possible to select a projection area projected by a plurality of projectors based on the positional relationship between the projection areas, and perform correction to align the image quality. Thereby, variation in the quality of the corrected image can be suppressed, and the quality of the image projected by the plurality of projectors can be corrected more efficiently and uniformly.

In order to achieve the above object, the present invention provides an image correction method in an image projection system including a plurality of projectors, wherein the first projector is based on a positional relationship of projection areas on which the plurality of projectors project images. The projection area and the second projection area lower than the first projection area are selected, and the image projected on the second projection area is corrected in accordance with the image projected on the first projection area. The projector that obtains correction data and projects an image on the second projection area corrects the image projected on the second projection area based on the correction data.
According to this method, a projection area projected by a plurality of projectors can be selected based on the positional relationship between the projection areas, and correction for aligning the image quality can be performed. Thereby, variation in the quality of the corrected image can be suppressed, and the quality of the image projected by the plurality of projectors can be corrected more efficiently and uniformly.

  The present invention can also be realized in various forms other than the above-described image projection system, projector, and control method of the image projection system. For example, it is also possible to realize a program executed by a control unit that controls the projector or a program for executing the control method by a computer. Also, for example, the present invention can be realized in the form of a recording medium that records the program, a server device that distributes the program, a transmission medium that transmits the program, a data signal in which the program is embodied in a carrier wave, and the like.

The system block diagram of an image projection system. The block diagram which shows the structure of a projector. The flowchart which shows operation | movement of a projector. The figure which shows the projection area | region and imaging range of a projector. The figure which shows the picked-up image data which imaged the pattern image. The figure which shows the picked-up image data which imaged the pattern image. The figure which shows the positional relationship of a projection area | region. The figure which shows the positional relationship of a projection area | region. The figure which shows the positional relationship of a projection area | region. The figure which shows the positional relationship of a projection area | region. The principle explanatory drawing of chromaticity correction. The figure which shows the picked-up image data which imaged the pattern image.

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.
An image projection system 1 shown in FIG. 1 includes a plurality of projectors that are arranged in front of a screen SC as a projection surface and project images onto the screen SC. The image projection system 1 of this embodiment includes four projectors 100, which are a projector 100A, a projector 100B, a projector 100C, and a projector 100D. Hereinafter, the projector 100A, the projector 100B, the projector 100C, and the projector 100D are collectively referred to as the projector 100.
Further, the image projection system 1 of the present embodiment is configured by arranging four projectors 100 in two vertical rows and two horizontal rows.
The number of projectors 100 constituting the image projection system 1 is not limited to four, but may be two, three, or four or more.
Also, the arrangement of the plurality of projectors 100 is not limited to two vertical rows and two horizontal rows. For example, a configuration in which four projectors 100 are arranged in a horizontal row may be employed.

The plurality of projectors 100 include projectors that operate as master projectors (control devices). The projector 100 as a master machine notifies the other projector 100 of an image to project an image on the screen SC, a timing for projecting the image, and a shooting instruction. In the present embodiment, the projector 100A is described as operating as a master projector, but the projector operating as a master projector is not limited to the projector 100A. For example, the projector 100 in which an operation panel 131 described later by the user is operated may operate as a master projector.
Hereinafter, the projector 100A is referred to as a master projector 100A. The master projector 100A corresponds to the control device of the present invention.

  The master projector 100A is connected to the other projectors 100 via the communication line 6, and transmits / receives various data to / from each sub projector 105. In the present embodiment, a case where the master projector 100A and another projector 100 are connected by wire is shown. However, the master projector 100A and the other projector 100 are connected by wireless communication such as wireless LAN or Bluetooth (registered trademark). May be.

Each projector 100 is connected to the image supply device 200 and receives an image signal supplied from the image supply device 200. FIG. 1 shows only a cable that connects the master projector 100A and the image supply device 200, but each sub-projector 105 is also connected to the image supply device 200 and receives an image signal supplied from the image supply device 200.
In addition, the projectors 100A, 100B, 100C, and 100D each project an image based on the image signal supplied from the image supply device 200 onto the screen SC. Master projector 100A projects a projection image onto projection area 10A of screen SC. The projector 100B projects a projection image on the projection area 10B of the screen SC. The projector 100C projects a projection image on the projection area 10C of the screen SC. The projector 100D projects a projection image on the projection area 10D of the screen SC. In general, when projecting such an image, a plurality of projectors 100 are arranged adjacent to each other, and the images are projected such that a part of the projection area between the adjacent projectors 100 overlaps.
Moreover, below, when it is not necessary to distinguish projection area 10A-10D, it describes with the projection area | region 10. FIG.

FIG. 2 is a configuration diagram of the projector 100.
Since the projectors 100A to 100D have substantially the same configuration, the configuration of the master projector 100A will be described as a representative.

  An 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 image data stored in advance in a storage unit 170A described later on the screen SC. For example, a video playback device, a DVD (Digital Versatile Disk) playback 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 as the image supply device 200. It is done.

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 the input image signal into image data and outputs the image data to the image processing unit 152A.
The interface included in the image input unit 151A may be a data communication interface such as Ethernet (registered trademark), IEEE 1394, or USB. Further, the interface of 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 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 as a connector. Further, the image input unit 151A includes an A / D conversion circuit, and when an analog video signal is input via the VGA terminal, the analog video signal is converted into image data by the A / D conversion circuit, and the image processing unit 152A Output to.

  The projector 100A includes a display unit 110A (projection unit) 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. 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. Furthermore, the light source unit 111A includes a lens group for increasing 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 modulation device 112A, and the like (both shown) Abbreviation) may be provided.

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

  The light modulation device 112A includes, for example, three liquid crystal panels corresponding to the three primary colors 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 the transmitted light to generate image light. The image light modulated by passing through each liquid crystal panel is combined by a combining optical system such as a cross dichroic prism, and emitted to the projection optical system 113A.

The light modulation device 112A is connected to a light modulation device driving unit 122A that drives the liquid crystal panel of the light modulation device 112A. The light modulation device 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 modulation device driving unit 122A drives the corresponding liquid crystal panel of the light modulation device 112A based on the generated R, G, and B image signals, and draws an image on each liquid crystal panel.

  The projection optical system 113A includes a lens group that projects the image light modulated by the light modulation device 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 the 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.
On the operation panel 131A functioning as a user interface, various operation keys and a display screen constituted by a liquid crystal panel are displayed. When the 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 displays various screens on the operation panel 131A according to the control of the control unit 160A.
The operation panel 131A is integrally formed with a touch sensor that detects contact with the operation panel 131A. The processing unit 133A detects the position of the operation panel 131A that has been touched by the user's finger or the like as an input position, and outputs data corresponding to the detected input position to the control unit 160A.

The projector 100A also 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.
The remote control light receiving unit 132A receives an infrared signal transmitted from the 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 in the remote control 5A, and outputs the data to the control unit 160A.

The projector 100A includes an imaging unit 140A.
The imaging unit 140A includes a camera having an imaging optical system, an imaging element, an interface circuit, and the like, and images the projection direction of the projection optical system 113A according to the control of the control unit 160A.
The imaging range of the imaging unit 140A, that is, the angle of view is an angle of view in which the range including the screen SC and its peripheral part is an imaging range. The imaging unit 140A outputs the captured image data that has been captured to the control unit 160A.

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

  The projector 100A includes an image processing system. The image processing system is configured with a control unit 160A that controls the entire projector 100A as a whole, 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 the 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, distortion correction, shape correction processing, digital zoom processing, image color tone and brightness on the image data expanded in the frame memory 155A. Perform adjustments and other processing. The image processing unit 152A executes processing specified by the control unit 160A, and performs processing using parameters input from the control unit 160A as necessary. Of course, the image processing unit 152A can also execute a combination of a plurality of processes.
The image processing unit 152A reads out the processed image data from the frame memory 155A, and outputs it as display image data to the light modulation device driving unit 122A.

  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 and the storage unit 170A in the RAM, and executes the control program expanded in the RAM to control each unit of the projector 100A.

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

161 A of projection control parts adjust the display mode of the image in 110 A of display parts, and perform 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 necessary for processing by the image processing unit 152A from the storage unit 170A and output the parameters to the image processing unit 152A.
In addition, 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 luminance of the light source. As a result, the light source emits light and the image light modulated by the light modulation device 112A is projected onto the screen SC by the projection optical system 113A.

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

  The correction control unit 163A adjusts the chromaticity (hue and saturation) of the projected image that each projector 100 projects onto the projection areas 10A to 10D. The details of the correction control unit 163A will be described with reference to the flowcharts shown in FIGS.

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

FIG. 3 is a flowchart showing the operation of the master projector 100A.
This processing flow is a flow for adjusting the chromaticity of an image projected by each projector 100 onto the screen SC.

  The control unit 160A of the master projector 100A monitors the input of the processing unit 133A and determines whether or not an operation from the operation panel 131A or the remote controller 5A has been accepted (step S1). If there is no data input from processing unit 133A, control unit 160A determines that no operation has been received (step S1 / NO), and executes other processing 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 that instructs chromaticity correction (step S1). S2). If the operation is not an instruction for chromaticity correction (step S2 / NO), the control unit 160A executes a process corresponding to the accepted operation (step S3), and returns to the determination of step S1.

When the received operation is an operation for instructing chromaticity correction (step S2 / YES), the correction control unit 163A first instructs the projector 100B connected to the communication line 3 to start chromaticity correction.
In addition, 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 to execute the chromaticity correction process, the master projector 100A is connected to the LAN. The device name and IP address of the projector 100 connected to the are acquired. Then, the master projector 100A displays the acquired device name and IP address on the operation panel 131A, and sets the projector 100 selected by operating the operation panel 131A or the remote controller 5A as the projector 100 that performs chromaticity correction.

Next, a pattern image is projected on each of the projection areas 10A to 10D, and captured image data obtained by capturing the projected pattern image is generated (step S4). The pattern image is an image in which marks having a predetermined shape are arranged at lattice points.
The correction control unit 163A instructs the projection control unit 161A to project a pattern image on the projection region 10A. The projection control unit 161A reads pattern image data from the storage unit 170A, and causes the display unit 110A to project a pattern image that is an image based on the read pattern image data onto the projection area 10A.
Next, the correction control unit 163A causes the imaging control unit 162A to generate captured image data obtained by capturing a pattern image. The imaging control unit 162A controls the imaging unit 140A to capture the screen SC direction and generate captured image data. Further, the correction control unit 163A instructs the projectors 100B to 100D to capture a pattern image projected on the projection area 10A.
When captured image data obtained by capturing a pattern image is input from each of the projectors 100B to 100D, the correction control unit 163A ends the projection of the pattern image on the projection region 10A.

The correction control unit 163A selects one projector 100 from the other projectors 100, and instructs the selected projector 100 to project a pattern image and to capture an image. Here, a case where the projector 100B is selected will be described as an example.
The selected projector 100B projects the pattern image onto its own projection area 10B. When the projection of the pattern image is completed, the projector 100B notifies the master projector 100A of the completion of the projection of the pattern image.
The master projector 100A instructs the projectors 100C and 100D other than the projector 100B to capture the pattern image projected on the projection area 10B. In addition, the master projector 100A captures a pattern image projected on the projection area 10B and generates a captured image. In addition, the projectors 100B to 100D capture a pattern image projected on the projection area 10B and generate captured image data. The projectors 100B to 100D transmit the generated captured image data to the master projector 100A.
The correction control unit 163A causes the projectors 100B and 100C to execute the above process in the same manner.

FIG. 4 is a diagram illustrating a projection area and an imaging range of the master projector 100A and the projector 100B.
The imaging range 15A captured by the imaging unit 140A of the projector 100A includes the entire projection area 10A and a part of the other projection areas 10B, 10C, and 10D.
The imaging range 15B captured by the imaging unit 140B of the projector 100B includes the entire projection area 10B and a part of the other projection areas 10A, 10C, and 10D.
The same applies to the projection areas 10C and 10D of the projectors 100C and 100D and the imaging ranges 15C and 15D.

FIG. 5 shows captured image data obtained by imaging the pattern image projected on the projection area 10A by the imaging unit 140A of the master projector 100A. FIG. 6 shows captured image data obtained by capturing the pattern image projected on the projection area 10B by the projector 100B with the imaging unit 140A of the master projector 100A.
As shown in FIG. 5, the entire pattern image of the pattern image projected onto the projection area 10A is captured by the imaging unit 140A. Further, as shown in FIG. 6, a part of the pattern image is imaged by the imaging unit 140A in the pattern image projected on the projection area 10B.

  The correction control unit 163A detects a mark reflected in the captured image data from the captured image data obtained by capturing the pattern image projected on the projection area 10A, identifies the lattice point, and identifies the coordinates of each identified lattice point. . The specified coordinates are coordinates in each captured image data.

  Next, the correction control unit 163A generates a correspondence table in which the coordinates of each grid point on the specified captured image data and the coordinates of each grid point in the pattern image data stored in the storage unit 170A are registered in association with each other. To do. 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.

  In addition, the projector 100B detects a mark reflected in the captured image data from the captured image data obtained by capturing the pattern image projected on the projection region 10B, identifies the lattice point, and identifies the coordinates of each identified lattice point. . Then, the projector 100B generates and generates a correspondence table in which the coordinates of each grid point on the specified captured image data and the coordinates of each grid point in the pattern image data stored in the storage unit 170A are registered in association with each other. The correspondence table thus transmitted is transmitted to the master projector 100A. The projectors 100C and 100D perform the same process.

Next, an adjustment image is projected onto each of the projection areas 10A to 10D, and captured image data obtained by imaging the projected adjustment image is generated (step S5). The adjustment image is a single color raster image of red (R), green (G), and blue (B), and a raster image of each color is prepared for each preset gradation.
The correction control unit 163A of the master projector 100A instructs the projection control unit 161A to project the adjustment image on the projection region 10A.
The projection control unit 161A reads the adjustment image data from the storage unit 170A, and the display unit 110A projects an adjustment image that is an image based on the read adjustment image data onto the projection region 10A.
Next, the correction control unit 163A causes the imaging control unit 162A to generate captured image data obtained by capturing the adjustment image. The imaging control unit 162A controls the imaging unit 140A to capture the screen SC direction and generate captured image data. Further, the correction control unit 163A instructs the projectors 100B to 100D to capture a pattern image projected on the projection area 10A.
When captured image data obtained by capturing an adjustment image is input from each of the projectors 100B to 100D, the correction control unit 163A changes at least one of the color and gradation of the adjustment image projected on the projection region 10A and captures the captured image. Generate data.

When the adjustment image is projected onto the projection area 10A in all colors and gradations, and the imaging of the captured image data obtained by imaging the projected adjustment image is completed, the correction control unit 163A selects from among the other projectors 100. One projector 100 is selected, and the selected projector 100 is instructed to project an adjustment image, specify the color and gradation of the adjustment image to be projected, and image capturing. Here, a case where the projector 100B is selected will be described as an example.
The selected projector 100B projects the adjustment image of the color and gradation designated from the master projector 100A onto its projection area 10B. When the projection of the pattern image is completed, the projector 100B notifies the master projector 100A of the completion of the projection of the pattern image.
The master projector 100A instructs the projectors 100C and 100D other than the projector 100B to capture the adjustment image projected on the projection area 10B. In addition, the master projector 100A captures an adjustment image projected on the projection area 10B and generates a captured image. In addition, the projectors 100B to 100D capture the adjustment image projected on the projection area 10B and generate captured image data. The projectors 100B to 100D transmit the generated captured image data to the master projector 100A.

The correction control unit 163A repeatedly performs the above processing while changing the color and gradation to be projected on the projector 100B, and generates captured image data with all colors and gradations.
In addition, the correction control unit 163A causes the projectors 100B and 100C to execute the above process in the same manner.

When the adjustment image capturing is completed, the correction control unit 163A sets the order of the projection areas 10 based on the positional relationship of the projection areas 10A to 10D, and sets the correction order. First, the correction control unit 163A determines the first projection area 10. The correction control unit 163A selects, as the first projection area 10, the projection area 10 located at the center of the projection target or the projection area 10 having the closest distance from the center of the projection target. The first projection area 10 is an area serving as a reference when correcting chromaticity (hue and saturation). That is, the chromaticities of the other projection areas 10 are corrected based on the chromaticity of the first projection area 10.
The center of the projection target is determined based on the number of projectors 100 that project an image and the arrangement information of the projection area 10 of each projector 100. For example, a rectangular figure indicating the projection area of each projector 100 is arranged based on the arrangement information, and a projection target area and a projection target center are determined. 7 to 10 show specific examples of the arrangement of the projection areas 10. The ordering of the projection areas 10 will be described with reference to FIGS.

FIG. 7 shows a case where the number of projection areas 10 is four and each projection area 10 is arranged in two rows and two rows. A projection area 10A and a projection area 10B are arranged in the upper row located above the projection target. Further, the projection area 10C and the projection area 10D are arranged in the lowest row located below the projection target.
The range to be projected is assumed to be a rectangular range of the minimum size surrounding the projection areas 10A to 10D. In FIG. 7, the center of the projection target is indicated by a black circle.
When the four projection areas 10 are formed on the projection target, there is no projection area 10 in which the center of the projection area 10 is located at or near the center of the projection target. That is, it is not possible to select one projection area 10 that is closest to the center of the projection target. In this case, the correction control unit 163A selects, as the first projection area 10, the projection area 10 whose center is the closest to the center of the projection target. Further, when the four projection areas 10 are formed on the projection target, the distances between the centers of the four projection areas 10 and the center of the projection target are substantially equal. When there are a plurality of projection areas 10 that are substantially equal in distance to the center of the projection target, the correction control unit 163A selects the first projection area 10 according to a preset selection rule. For example, the center of the projection area 10 is above the center of the projection target, and the projection area 10 having the center of the projection area 10 on the right side of the center of the projection target may be selected as the first projection area. . FIG. 7 shows a state in which the upper right projection area 10B is selected as the first projection area 10 in accordance with this selection rule.

FIG. 8 shows a case where the number of projection areas 10 is six and each projection area 10 is arranged in two columns and three rows.
A projection area 10A and a projection area 10B are arranged in the uppermost row located on the uppermost side of the projection target. Further, a projection area 10E and a projection area 10F are arranged in the lowest row located on the lowermost side of the projection target. Further, the projection area 10C and the projection area 10D are arranged in the middle line between the uppermost line to be projected and the lowermost line.
When six projection areas 10 in two columns and three rows are formed in the projection target, there is no projection area 10 in which the center of the projection area 10 is located at or near the center of the projection target. That is, it is not possible to select one projection area 10 that is closest to the center of the projection target. In this case, the correction control unit 163A selects the projection area 10C or 10D whose center of the projection area 10 is closest to the center of the projection target as the first projection area 10. When there are a plurality of projection areas 10 that are substantially equal in distance to the center of the projection target, the correction control unit 163A selects the first projection area 10 according to a preset selection rule.
FIG. 8 shows a case where the projection area 10D located on the right side of the projection area 10C and the projection area 10D is selected as the first projection area 10 in accordance with a preset selection rule.

FIG. 9 shows a case where the number of projection areas 10 is nine and each projection area 10 is arranged in three columns and three rows.
A projection area 10A, a projection area 10B, and a projection area 10C are arranged in the uppermost row located on the uppermost side of the projection target. Further, the projection area 10G, the projection area 10H, and the projection area 10I are arranged in the lowest row located on the lowermost side of the projection target. Further, the projection area 10D, the projection area 10E, and the projection area 10F are arranged in the middle line between the uppermost line to be projected and the lowermost line.
When nine projection areas 10 in three columns and three rows are formed on the projection target, the center of the projection area 10E is located at or near the center of the projection target. In this case, the correction control unit 163A selects the projection area 10E as the first projection area 10.

FIG. 10 shows a state in which the number of the projection areas 10 is nine and the projection areas 10A to 10I are arranged in a line in order from the left.
In this case, the center of the projection area 10E is located at or near the center of the projection target. The correction control unit 163A selects the projection area 10E as the first projection area 10.
For example, when the number of the projection areas 10 is 10 and the projection areas 10A to 10J are arranged in a line in order from the left, the correction control unit 163A selects the projection area 10E or the projection area 10F as the first. The projection area 10 is selected.

When determining the first projection area 10, the correction control unit 163 </ b> A determines the order of the other projection areas 10 whose order has not been determined based on the determined position of the first projection area 10.
For example, in the case of the arrangement of the projection area 10 shown in FIG. 7, the projection area 10 </ b> A and the projection area 10 </ b> D that are close to the center of the projection area 10 </ b> B that is the determined first projection area 10 are the second projection. Region 10 is entered. Further, the projection area 10 </ b> C that is far from the center of the projection area 10 </ b> B is the third projection area 10.
One first projection area 10 is selected, but a plurality of second and subsequent projection areas may be selected.
In the case of the arrangement of the projection area 10 shown in FIG. 8, the projection area 10B, the projection area 10C, and the projection area 10F that are close to the center of the projection area 10D that is the determined first projection area 10 are provided. This is the second projection area 10. Further, the projection area 10 </ b> A that is far from the center of the projection area 10 </ b> D and the projection area 10 </ b> E are the third projection area 10.

In the case of the arrangement of the projection area 10 shown in FIG. 9, the projection area 10B, the projection area 10D, and the projection area 10F that are close to the center of the projection area 10E that is the determined first projection area 10, The projection area 10H is the second projection area 10. Further, the projection area 10A, the projection area 10C, the projection area 10G, and the projection area 10I that are far from the center of the projection area 10D are the third projection area 10.
Further, in the case of the arrangement of the projection areas 10 shown in FIG. 10, the projection area 10D and the projection area 10F that are closest to the center of the projection area 10E that is the determined first projection area 10 are the second. It becomes the projection area 10. Further, the projection area 10 </ b> C and the projection area 10 </ b> G that are the next closest to the center of the projection area 10 </ b> E are the third projection area 10. Further, the projection area 10B, which is the next closest to the center of the projection area 10E, and the projection area 10H are the fourth projection area 10. Further, the projection area 10A having the longest distance from the center of the projection area 10E and the projection area 10I are the fifth projection area 10.

When the correction control unit 163A sets the order for each projection area 10 and sets the correction order, the correction control unit 163A selects the upper first projection area and the lower second projection area according to the set correction order. To do. The correction control unit 163A generates correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area.
First, the correction control unit 163 selects the first projection area as the first projection area, and selects the second projection area as the second projection area. The correction control unit 163 generates correction data for correcting the captured image data obtained by imaging the second projection area in accordance with the captured image data obtained by imaging the first projection area.
When correction data for correcting captured image data obtained by imaging the second projection area is generated, the correction control unit 163 selects the second projection area as the first projection area, and the second projection area As a result, the third projection area is selected. The correction control unit 163 generates correction data for correcting the captured image data obtained by imaging the third projection area in accordance with the captured image data obtained by imaging the corrected second projection area. Thereafter, the same procedure is repeated to generate correction data for correcting up to the projection area in the last assigned order.

Hereinafter, a case where correction data is generated will be described by way of example in which the projection area 10A is selected as the first projection area 10 and the projection area 10B is selected as the second projection area 10.
The correction control unit 163A selects a grid point serving as a reference for chromaticity correction from captured image data of a pattern image projected onto the projection area 10A by the master projector 100A and captured by the master projector 100A (step S9). Hereinafter, the captured image data is referred to as first captured image data. The selected lattice point is hereinafter referred to as lattice point A. The grid point A may be any grid point on the pattern image data, but in this processing flow, the grid point located at the center of the pattern image data is the grid point A (see FIG. 5). As selected. 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 so that the XYZ values of other grid points projected on the projection area 10A become target values. Perform correction processing.

  Next, the correction control unit 163A selects a color and gradation to be processed, and selects captured image data obtained by capturing an adjustment image of the selected color and gradation. The captured image data is captured image data in which the projector 100A projects an adjustment image on the projection area 10A, and the projector 100A images the projected adjustment image. Hereinafter, this captured image data is referred to as second captured image data. The correction control unit 163A refers to the correspondence table and specifies the position of each grid point on the selected second captured image data (step S10). The grid points on the second captured image data are grid points of the projection area 10A.

  Next, the correction control unit 163A acquires the captured value of the second captured image data at the position of each identified grid point. When the imaging value is acquired, the correction control unit 163A converts the acquired imaging value of each grid point into a value (XYZ value) in the XYZ color system.

  Next, the correction control unit 163A calculates correction values for correcting the XYZ values of the grid points other than the grid point A, which are grid points of the projection area 10A, to the XYZ values of the grid point A (step S11). . The correction value calculated for each lattice point is referred to as a first correction value.

  Next, the correction control unit 163A selects one grid point from the grid points of the projection area 10B captured in the captured image data (step S12). The captured image data is captured image data captured by the projector 100A by projecting a pattern image onto the projection area 10B. Hereinafter, the captured image data is referred to as third captured image data. In addition, the grid point selected by the correction control unit 163A is referred to as a grid point B (see FIG. 6). The selected grid point B may be any grid point as long as it is the grid point of the projection area 10B shown in the third captured image data.

Next, the correction control unit 163A calculates a second correction value (step S13). 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 the grid point B to the XYZ value of the grid point A.
First, the correction control unit 163A selects captured image data obtained by capturing an image for color and gradation adjustment selected as a processing target. This captured image data is captured image data obtained by capturing an adjustment image projected on the projection area 10B by the projector 100B. Hereinafter, this captured image data is referred to as fourth captured image data.
The correction control unit 163A compares the selected fourth captured image data with the third captured image data, and specifies the position of the lattice point B in the fourth captured image data. The correction control unit 163A acquires the imaging value of the fourth captured image data at the specified position of the lattice point B. Next, the correction control unit 163A converts the acquired imaging value of the lattice point B into an XYZ value.

Next, the correction control unit 163A selects picked-up image data obtained by picking up an image for color and gradation adjustment selected as a processing target from picked-up image data picked up by the projector 100B. Hereinafter, the selected captured image data is referred to as fifth captured image data.
Next, the correction control unit 163A specifies the position of each grid point of the projection area 10B in the fifth captured image data (step S14). First, the correction control unit 163A acquires captured image data in which the projector 100B captures a pattern image in the projection area 10B and the projector 100B captures the pattern image. Hereinafter, the captured image data is referred to as sixth captured image data. Next, the correction control unit 163A compares the fifth captured image data with the sixth captured image data, and specifies the position of each lattice point of the projection area 10B in the fifth captured image data.

  Next, the correction control unit 163A acquires the imaging value of the fifth captured image data at each lattice point of the specified projection area 10B. When the imaging value is acquired, the correction control unit 163A converts the acquired imaging value of each grid point into a value (XYZ value) in the XYZ color system.

  Next, the correction control unit 163A further specifies the grid point B from the grid points of the specified projection area 10B, and corrects the XYZ values of the specified grid point B based on the second correction value (Step S1). S15). 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 the drawing. The XYZ value of the grid point B to which the correction amount based on the second correction value is added becomes a correction target value in the projection area 10B.

  Next, the correction control unit 163A corrects the XYZ values of the lattice points (a plurality of locations) other than the lattice point B of the projection region 10B to the XYZ values of the lattice point B (predetermined point) that is the target value. A value (hereinafter referred to as a third correction value) is calculated (step S16). When the correction control unit 163A calculates the third correction value for correcting the chromaticity of each grid point in the projection area 10B, the correction control unit 163A transmits the calculated second correction value and third correction value to the projector 100B (step S17).

FIG. 11 is an explanatory diagram of the principle of chromaticity correction. FIG. 12 shows captured image data in which the projector 100B projects a pattern image on the projection area 10B and the projected pattern image is captured by the imaging unit 140B of the projector 100B.
In FIG. 11, the vertical axis represents XYZ values, and the horizontal axis represents the positions of lattice points.
If there is an individual difference in sensitivity between the camera included in the imaging unit 140A of the master projector 100A and the camera included in the imaging unit 140B of the projector 100B, an error is included in the imaging value calculated based on the generated captured image data. In some cases, the chromaticity of the image projected by the projector 100B cannot be accurately matched to the chromaticity of the image projected by the master projector 100A.

In FIG. 11, the XYZ value of the grid point A calculated from the captured image data of the imaging unit 140A is the XYZ value (X ₁ , Y ₁ , Z ₁ ) of the point a. The XYZ values (X ₁ , Y ₁ , Z ₁ ) of the lattice point A are target values in the projection area 10A.
Further, the XYZ value of the lattice point B calculated from the captured image data of the imaging unit 140A is set as the XYZ value (X ₂ , Y ₂ , Z ₂ ) of the point b. Tone value calculated based on the difference between the XYZ value (X ₁ , Y ₁ , Z ₁ ) of the grid point A, which is the target value, and the XYZ value (X ₂ , Y ₂ , Z ₂ ) of the grid point B Is the second correction value described above. The correction amount of the XYZ value based on the second correction value for correcting this gradation value is α.
Incidentally, in FIG. 11, 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 value of the lattice point B calculated from the captured image data of the imaging unit 140B is set as the XYZ value (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 ) which is the XYZ value of the grid point B, and projects the XYZ value obtained by the addition. The target value in the area 10B 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 set as the XYZ value (X ₄ , Y ₄ , Z ₄ ) of the point e.
The correction control unit 163A corrects the XYZ values of other lattice points in the projection area 10B using the XYZ values (X ₄ , Y ₄ , Z ₄ ) of the point d as target values.

For example, it is assumed that the XYZ value of the lattice point C shown in FIG. 12 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.

  As described above, the image projection system 1 according to the embodiment to which the present invention is applied includes a plurality of projectors 100. The projector 100A includes a display unit 110A that projects an image. For example, the projector 100A operates as a master projector. The projector 100A includes a correction control unit 163A. The correction control unit 163A selects the first projection area and the second projection area based on the positional relationship of the projection areas 10 on which the plurality of projectors 100 project images. The correction control unit 163A obtains correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area.

  The projector 100A can communicate with a plurality of projectors 100B, 100C, and 100D, and includes a display unit 110A that projects an image, an imaging unit 140A that captures a projection area, and a correction control unit 163A. The correction control unit 163A selects the first projection area and the second projection area based on the positional relationship between the plurality of projection areas 10. The correction control unit 163A obtains correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area, and projects the correction data on the second projection area. Send to the projector you want to use.

  For example, the correction control unit 163A selects the first projection area and the second projection area based on the positional relationship between the projection areas 10A to 10D of the projectors 100A, 100B, 100C, and 100D. The projector 100 that projects an image on the second projection area corrects the projection image based on the correction data that the projector 100A calculates.

  As described above, by applying the image correction method in the image projection system 1, the projector 100A, and the image projection system 1 of the present embodiment, the following operational effects can be obtained. That is, it is possible to select a projection area to be projected by the plurality of projectors 100 based on the positional relationship of the projection areas, and perform correction to align the image quality. Thereby, variation in the quality of the corrected image can be suppressed, and the quality of the image projected by the plurality of projectors can be corrected more efficiently and uniformly.

  Further, the correction control unit 163A sets the correction order of the plurality of projection areas based on the positional relationship between the projection areas 10A to 10D on which the projectors 100A, 100B, 100C, and 100D project images. The correction control unit 163A selects a first projection area and a second projection area lower than the first projection area in accordance with the set correction order. Thus, the correction order is set for the projection area 10 projected by the projector 100, and the projection area 10 is selected according to the correction order to perform correction. For this reason, even if correction data is obtained and corrected for a part of the entire image projected by the plurality of projectors 100, variation in the quality of the corrected image can be suppressed, and the entire projected image can be corrected uniformly.

  Further, the projector 100A operates as a master projector, and the projector 100A also projects an image. The correction control unit 163A can set the correction order based on the positional relationship between a plurality of projection areas including a projection area projected by the projector 100A and a projection area where another projector 100 projects an image.

  In addition, the correction control unit 163A sets the correction order so that the projection area at the center or near the center of the plurality of projection areas is higher than the other projection areas. Alternatively, the correction control unit 163A sets the projection area at the center of the plurality of projection areas or a position close to the center in the correction order, and sets the correction order of the other projection areas based on the distance from the first projection area in the correction order. To set. For example, the correction control unit 163A selects the projection area 10 closest to the center of the projection target as the first projection area 10 for the four projection areas 10A to 10D in two columns and two rows. For example, the correction control unit 163A selects the projection area 10E as the first projection area 10 for the nine projection areas 10A to 10I in three columns and three rows. Thereby, it can correct | amend so that the whole projection area | region which a some projector projects may match | combine with the projection area | region of the side near the center.

  Any one of the projectors 100 includes an imaging unit that captures an area including at least a part of the first projection area and at least a part of the second projection area. For example, the projector 100A includes an imaging unit 140A, and the projector 100B includes an imaging unit 140B. The correction control unit 163A captures a first captured image obtained by imaging an image projected on the first projection area by the imaging unit 140A or the imaging unit 140B, and an image obtained by imaging the image projected on the second projection area by the imaging unit. Correction data is obtained based on the two captured images. Thereby, it is possible to correct the quality of the entire projection images of the plurality of projectors by using an imaging unit that captures a part of the entire projection image of the plurality of projectors 100.

The correction control unit 163A determines a target color based on the first captured image, and corrects correction data for correcting the color of the image projected on the second projection area to the target color based on the second captured image. Ask. Thereby, the correction which arranges the color of the whole projection image of a some projector can be performed.
In addition, the correction control unit 163A determines the imaging value at the first position in the first captured image as a target color, and obtains correction data for correcting the imaging value at the second position in the second captured image to the target color. Thereby, the color of the projection image of the projector can be corrected with high accuracy using an imaging unit that captures a part of the entire projection image of the plurality of projectors.

The above-described embodiment is a preferred embodiment 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 embodiment, the case where the projector 100A operates as a master projector has been described as an example. However, the projector 100 that operates as a master projector is not limited to the projector 100A. Further, an apparatus other than the projector, for example, a personal computer can be operated as the master projector 100.

In the above-described embodiment, the center of the projection area 10 of the projector 100 (that is, the center of the liquid crystal panel) is set as the target value of chromaticity, but the chromaticity of other parts of the projection area 10 is set as the target value. May be.
Alternatively, a preset target value may be stored in the storage unit 170A of the master projector 100A, and a value read from the storage unit 170A may be set as a target value when adjusting chromaticity. Further, the user operates the operation panel 131A or the remote controller 5A to cause the master projector 100A to capture the screen SC by the imaging unit 140A, and sets and sets the chromaticity target value based on the captured image data. The target value can also be stored in the storage unit 170A.
Furthermore, target values of different chromaticities may be set according to the position of the liquid crystal panel. For example, a target value calculated from captured image data captured by the imaging unit 140 is calculated for a range where images projected from a plurality of projectors 100 overlap, and a target value stored in advance in the storage unit 170A is calculated for other ranges. May be used.

  In the embodiment described above, the projector 100 is described as an example of a liquid crystal projector using a transmissive liquid crystal panel, but may be a projector using a reflective liquid crystal panel or a digital mirror device.

  Each functional unit of the projector 100 illustrated in FIG. 2 indicates 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 mount hardware corresponding to each function unit individually, and it is of course possible to realize a function of a plurality of function units by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software.

  DESCRIPTION OF SYMBOLS 1 ... Image projection system, 5A ... Remote control, 3 ... Communication line, 10A-10I ... Projection area | region, 100, 100B, 100C, 100D ... Projector, 100A ... Master projector (control apparatus), 110A ... Display part (projection part), 111A ... light source unit, 112A, 112B ... light modulation device, 113A, ... projection optical system projecting unit, 121A ... light source drive unit, 122A ... light modulation device drive unit, 131A ... operation panel, 132A ... remote control light receiving unit, 133A ... processing , 140A ... Imaging unit, 151A ... Image input unit, 152A ... Image processing unit, 155A ... Frame memory, 160A ... Control unit, 161A ... Projection control unit, 162A ... Imaging control unit, 163A ... Correction control unit (control unit) , 170A, storage unit, 175A, communication unit, 180A, internal bus, 200, image supply device.

Claims (10)

An image projection system comprising a plurality of projectors and a control device comprising a projection unit for projecting an image,
The controller is
The first projection area and the second projection area are selected based on the positional relationship of the projection areas where the plurality of projectors project images, and the second is selected in accordance with the image projected on the first projection area. A control unit for obtaining correction data for correcting an image projected on the projection area of
The projector that projects an image on the second projection area corrects the image projected by the projection unit based on the correction data obtained by the control device;
An image projection system characterized by. The control unit sets a correction order of the plurality of projection areas based on a positional relationship of projection areas where the plurality of projectors project images, and according to the set correction order, the first projection area, Selecting the second projection area lower than the first projection area;
The image projection system according to claim 1. The control device is a projector including a projection unit that projects an image,
The control unit sets the correction order based on a positional relationship of a plurality of projection areas including a projection area where the control device projects an image and the projection area where the plurality of projectors project an image. To do,
The image projection system according to claim 1 or 2.   The said control part sets the said correction order so that the said projection area | region of the position of the center of the said several projection area | region or a position close | similar to a center may become a higher rank than the said other projection area | region. 4. The image projection system according to any one of items 1 to 3.   The control unit sets the projection area at the center of the plurality of projection areas or a position close to the center to the beginning of the correction order, and sets the correction order of the other projection areas from the first projection area in the correction order. 5. The image projection system according to claim 1, wherein the image projection system is set based on a distance between the image projection system and the image projection system. Any of the projectors includes an imaging unit that images a range including at least a part of the first projection area and at least a part of the second projection area,
The control unit captures a first captured image obtained by imaging the image projected on the first projection area by the imaging unit, and a second image obtained by imaging the image projected on the second projection area by the imaging unit. Obtaining the correction data based on the image;
The image projection system according to claim 5. The control unit determines a target color based on the first captured image, and corrects the color of the image projected on the second projection area to the target color based on the second captured image. Seeking data,
The image projection system according to claim 6. The control unit determines the image pickup value at the first position in the first picked-up image as the target color, and corrects the correction data for correcting the image pickup value at the second position in the second picked-up image to the target color. Seeking,
The image projection system according to claim 7. A projector capable of communicating with a plurality of projectors,
A projection unit for projecting an image;
An imaging unit that images a projection area in which the projection unit projects an image; and
The first projection area and the second projection area based on a positional relationship of a plurality of projection areas including a projection area where the projection unit projects an image and a projection area where the plurality of projectors project an image. And a control unit for obtaining correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area,
Transmitting the correction data to the projector that projects an image on the second projection area;
Projector. An image correction method in an image projection system including a plurality of projectors,
Based on the positional relationship of the projection areas where the plurality of projectors project images, the first projection area and the second projection area lower than the first projection area are selected,
Obtaining correction data for correcting the image projected on the second projection area in accordance with the image projected on the first projection area;
The projector that projects an image on the second projection area corrects the image projected on the second projection area based on the correction data;
An image correction method characterized by the above.

Images