JP2017129728A - Image quality correcting method and image projecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately uniformize an image quality of a projection image projected by a plurality of projectors.SOLUTION: An image quality correcting method performs: a target value setting step of setting a correction target value on the basis of master picked-up image data and sub picked-up image data in a master projector 100A; a first correction data generating step of calculating first correction data on the basis of the difference between the master picked-up image data and the target value; a second correction data generating step of calculating second correction data on the basis of the difference between the sub picked-up image data and the target value; and a second transmitting step of transmitting the first correction data from a second projector to a first projector.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image quality correction method and an image projection system.

2. Description of the Related Art Conventionally, a technique for displaying a single large image by connecting projection images projected by a plurality of projectors is known. When images are projected by a plurality of projectors, it is known that deviations occur in the brightness and color of the projected images projected by the projectors due to individual differences between the projectors (for example, see Patent Document 1).
An image display system disclosed in Patent Literature 1 captures a composite image including a first display image displayed by a first image display device and a second display image displayed by a second image display device. To capture image information at once. The image adjustment device adjusts at least one of the first display image and the second display image based on image information captured by the imaging device.

JP 2010-85562 A

However, when a projected image is captured using an imaging device mounted on a projector, there are cases where all of the projected images projected by a plurality of projectors cannot be captured by a single imaging device. In other words, since the projector is installed at a position that is preferable for image projection, a sufficient distance cannot be secured between the imaging device and the projection target on which the projection image is projected, and projection performed by a plurality of projectors. It may not be possible to capture all of the image.
For this reason, there has been a need for a technique for making the image quality of the projection images projected by the plurality of projectors uniform using the captured images of the imaging devices mounted on the projectors.
The present invention has been made in view of the above circumstances, and an object thereof is to make the image quality of a projected image projected by a plurality of projectors uniform with high accuracy.

In order to achieve the above object, an image quality correction method according to the present invention includes a first captured image generation step of projecting an image in a first projector, capturing the projected image, and generating a first captured image; A first transmission step of transmitting the first captured image from the first projector to the second projector, wherein the second projector projects an image, images the projected image, and captures the second captured image. A second captured image generation step for generating; a target value setting step for setting a correction target value based on the first captured image and the second captured image by the second projector; and Based on the difference between the first captured image and the target value, a first correction data generation step for obtaining first correction data and the second projector A second correction data generation step for obtaining second correction data based on a difference between the second captured image and the target value, and a second transmission step for transmitting the first correction data from the second projector to the first projector. It is characterized by having.
According to the present invention, a correction target value is set based on the first captured image and the second captured image, and first correction data for correcting the first captured image is generated based on the set correction target value, Second correction data for correcting the second captured image is generated. Accordingly, the image projected by each projector can be corrected to make the image quality uniform.

According to the present invention, in the image quality correction method, in the target value setting step, the second projector receives brightness information indicating brightness of a projection image from the first captured image and the second captured image, respectively. And a brightness correction target value is set based on the generated brightness information, and the second projector generates brightness information generated from the first captured image in the first correction data generation step. And the target value, and the second projector generates brightness information generated from the second captured image and the target value in the second correction data generation step. The second correction data is generated based on the difference between the first correction data and the second correction data.
According to the present invention, the correction target value is set based on the brightness information indicating the brightness of the first captured image and the second captured image, and the first captured image is corrected based on the set correction target value. First correction data is generated, and second correction data for correcting the second captured image is generated. Therefore, the brightness of the projected image projected by each projector can be corrected to make the brightness of the projected image uniform.

In the image quality correction method according to the aspect of the invention, the second projector may generate color information indicating a color of a projection image from the first captured image and the second captured image, respectively, in the target value setting step. Based on each of the generated color information, a target value for color correction is set, and the second projector includes color information of the projection image generated from the first captured image in the first correction data generation step. First correction data is generated based on a difference from the target value, and the second projector generates color information of the projection image generated from the second captured image and the second correction data generation step, and The second correction data is generated based on the difference from the target value.
According to the present invention, the correction target value is set based on the color information indicating the colors of the first captured image and the second captured image, and the first captured image is corrected based on the set correction target value. Correction data is generated, and second correction data for correcting the second captured image is generated. Therefore, the color of the projection image projected by each projector can be corrected to make the color of the projection image uniform.

In the image quality correction method according to the aspect of the invention, in the target value setting step, the second projector causes the projection image of the first projector and the projection image of the second projector to overlap from the first captured image. An overlapping area is detected, brightness information indicating the brightness of the overlapping area is generated, and a target value for brightness correction is set based on the generated brightness information.
According to the present invention, the brightness correction target value can be set reflecting the brightness of the overlapping region.

According to the present invention, in the image quality correction method, the projection value of the first projector and the second image can be obtained by the second projector based on the first captured image and the second captured image in the target value setting step. Generating a target value of the brightness of the overlapping area where the projection images of the two projectors overlap, and in the first correction data generating step, based on the target value of the brightness of the first captured image and the overlapping area, First correction data for correcting the luminance gradient of the first projector in the overlapping area is obtained, and the overlapping is performed based on the second captured image and the brightness target value of the overlapping area in the second correction data generating step. Second correction data for correcting a luminance gradient of the second projector in the region is obtained.
According to the present invention, it is possible to correct the brightness gradient in the overlapping region and reduce the change in brightness at the boundary of the projection image of each projector.

According to the present invention, in the image quality correction method, in the first captured image generation step, a red image, a green image, and a blue image of a first gradation set in advance are sequentially projected by the first projector, and sequentially projected. A first captured image is generated by capturing a captured image, a red image, a green image, and a blue image of a second gradation set in advance are sequentially projected, and the sequentially projected images are captured to obtain a first captured image In the second captured image generation step, the second projector sequentially projects the first gradation red image, green image, and blue image, and sequentially images the projected image to obtain the second captured image. And the second gradation red image, the green image and the blue image are sequentially projected, and the sequentially projected images are captured to generate a second captured image.
According to the present invention, a red image, a green image, and a blue image having the same gradation can be projected in a short time to generate a captured image. Since the projector changes the brightness of the light source as the temperature of the light source is changed, it is generated by projecting a red image, green image, and blue image of the same gradation within a short time. The influence of the brightness change on the captured image can be reduced.

The image projection system of the present invention is an image projection system including a first projector and a second projector, and the first projector is projected by a first projection unit that projects an image and the first projection unit. A first imaging unit that captures a range that includes the first image, and a first transmission unit that transmits the first captured image captured by the first imaging unit to the second projector, wherein the second projector includes: A second projection unit that projects an image, a second imaging unit that captures a range including an image projected by the second projection unit, a second captured image captured by the second imaging unit, and the first A correction target value is set based on the first captured image received from the projector, first correction data is obtained based on a difference between the first captured image and the target value, and the second captured image and the Based on the difference between the target value, a correction data generation unit for obtaining the second correction data, characterized in that it comprises a second transmission unit that transmits the first correction data to the first projector.
According to the present invention, a correction target value is set based on the first captured image and the second captured image, and first correction data for correcting the first captured image is generated based on the set correction target value, First correction data for correcting the first captured image is generated. Accordingly, the image projected by each projector can be corrected to make the image quality uniform.

The system block diagram of an image projection system. The block diagram of a projector. The flowchart which shows operation | movement of a projector. The flowchart which shows operation | movement of a projector. The flowchart which shows operation | movement of a projector. The flowchart which shows operation | movement of a projector.

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. 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 are divided into a projector 100 that operates as a master projector and a projector 100 that operates as a sub projector. In the present embodiment, the projector 100A operates as a master projector, and the other projectors 100B, 100C, and 100D operate as sub projectors. Any of the other projectors 100B, 100C, and 100D can be operated as the master projector 100.
Hereinafter, the projector 100A is referred to as a master projector 100A, and the projectors 100B, 100C, and 100D are collectively referred to as a sub projector 105. The master projector 100A corresponds to the “second projector” of the present invention. The sub projector 105 corresponds to the “first projector” of the invention.

The master projector 100A is connected to each sub projector 105 via the communication line 6, and transmits / receives various data to / from each sub projector 105. In this embodiment, the master projector 100A and each sub projector 105 are connected by wire. However, the master projector 100A and each sub projector 105 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.

Master projector 100A projects projected image 10A onto screen SC. The projector 100B projects the projection image 10B on the screen SC. The projector 100C projects the projection image 10C on the screen SC. The projector 100D projects the projection image 10D on the screen SC.
A region A of the screen SC shown in FIG. 1 is a superimposed region in which the projection image 10A and the projection image 10B are superimposed. Hereinafter, it is referred to as a superimposed region A. A region B of the screen SC is a superimposed region where the projection image 10A and the projection image 10C are superimposed. Hereinafter, it is referred to as an overlapping region B. A region C of the screen SC is a superimposed region in which the projection image 10B and the projection image 10D are superimposed. Hereinafter, it is referred to as a superimposed region C. A region D of the screen SC is a superimposed region where the projection image 10C and the projection image 10D are superimposed. Hereinafter, it is referred to as an overlapping region D. Further, the area E of the screen SC is an overlapping area where the projected images 10A, 10B, 10C, and 10D are overlapped. Hereinafter, it is referred to as an overlapping region E.
In the present embodiment, a case where all of the projection images 10A, 10B, 10C, and 10D overlap with other projection images 10A, 10B, 10C, and 10D in a part of the region is shown. However, the projected images 10A, 10B, 10C, and 10D may be in a state of being projected onto the screen SC so as not to overlap.

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

FIG. 2 is a block diagram showing the configuration of the master projector 100A.
The master projector 100A is connected to an external image supply device 200 such as a personal computer or various video players, and projects an image based on an image signal supplied from the image supply device 200 onto a projection target. The master projector 100 </ b> A transmits the image signal supplied from the image supply device 200 to the other sub projector 105.
The image supply device 200 may be 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. it can.
The projection target may be an object that is not uniformly flat, such as a building or an object, or may have a flat projection surface such as a screen SC or a wall surface of a building. FIG. 2 shows a flat screen SC as a projection target.

The master projector 100A includes an image input interface unit (hereinafter abbreviated as an image input I / F unit) 151.
The image input I / F unit 151 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 I / F unit 151 converts the input image signal into image data and outputs the image data to the image processing unit 153.
The interface provided in the image input I / F unit 151 may be, for example, an interface for data communication such as Ethernet (registered trademark), IEEE 1394, or USB. The interface of the image input I / F unit 151 may be an interface for image data such as MHL (registered trademark), HDMI (registered trademark), and DisplayPort.
Further, the image input I / F unit 151 may 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 I / F unit 151 includes an A / D conversion circuit. 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. The data is output to the processing unit 153.

  The master projector 100A includes a display unit 110 that forms an optical image and projects the image onto the screen SC. The display unit 110 includes a light source unit 111, a light modulation device 112, and a projection optical system 113. The display unit 110 corresponds to the “first projection unit, second projection unit” of the present invention.

  The light source unit 111 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 111 may include a reflector and an auxiliary reflector that guide light emitted from the light source to the light modulation device 112. Further, the light source unit 111 includes a lens group for increasing the optical characteristics of the projection light, a polarizing plate, a light control element that reduces the amount of light emitted from the light source on the path to the light modulation device 112 (both shown) Abbreviation) may be provided.

  The light source unit 111 is driven by the light source driving unit 121. The light source driving unit 121 is connected to the internal bus 180. The light source driving unit 121 turns on and off the light source of the light source unit 111 under the control of the control unit 170.

  The light modulation device 112 includes, for example, three liquid crystal panels corresponding to the three primary colors RGB. The light emitted from the light source unit 111 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 113.

The light modulation device 112 is connected to the light modulation device 112 for driving the liquid crystal panel of the light modulation device 112. The light modulator driving unit 122 is connected to the internal bus 180.
The light modulation device driving unit 122 generates R, G, and B image signals based on display image data (described later) input from the image processing unit 153, respectively. The light modulator driving unit 122 drives the corresponding liquid crystal panel of the light modulator 112 based on the generated R, G, B image signals, and draws an image on each liquid crystal panel.

  The projection optical system 113 includes a lens group that projects the image light modulated by the light modulation device 112 toward the screen SC and forms an image on the screen SC. Further, the projection optical system 113 may include a zoom mechanism for enlarging / reducing the projected image of the screen SC and adjusting the focus, and a focus adjusting mechanism for adjusting the focus.

The master projector 100A includes an operation panel 141 and an input processing unit 143. The input processing unit 143 is connected to the internal bus 180.
On the operation panel 141 functioning as a user interface, various operation keys and a display screen composed of a liquid crystal panel are displayed. When the operation key displayed on the operation panel 141 is operated, the input processing unit 143 outputs data corresponding to the operated key to the control unit 170. Further, the input processing unit 143 displays various screens on the operation panel 141 under the control of the control unit 170.
The operation panel 141 is integrally formed with a touch sensor that detects contact with the operation panel 141. The input processing unit 143 detects the position of the operation panel 141 touched by the user's finger or the like as the input position, and outputs data corresponding to the detected input position to the control unit 170.

The projector 100 also includes a remote control light receiving unit 142 that receives an infrared signal transmitted from the remote controller 5 used by the user. The remote control light receiving unit 142 is connected to the input processing unit 143.
The remote control light receiving unit 142 receives an infrared signal transmitted from the remote control 5. The input processing unit 143 decodes the infrared signal received by the remote control light receiving unit 142, generates data indicating the operation content in the remote control 5, and outputs the data to the control unit 170.

The master projector 100A includes an imaging unit 145. The imaging unit 145 of the master projector 100A corresponds to the “second imaging unit” of the present invention, and the imaging unit 145 of the sub projector 105 corresponds to the “first imaging unit” of the present invention.
The imaging unit 145 includes a camera having an imaging optical system, an imaging element, an interface circuit, and the like. The imaging unit 145 images the projection direction of the projection optical system 113 according to the control of the control unit 170, and generates captured image data. The imaging range of the imaging unit 145, that is, the angle of view is a range including the screen SC and its peripheral part. The imaging unit 145 outputs the generated captured image data to the control unit 170.

The master projector 100A includes a communication unit 147. The communication unit 147 of the master projector 100A corresponds to the “second transmission unit” of the present invention, and the communication unit 147 of the sub projector 105 corresponds to the “first transmission unit” of the present invention.
The communication unit 147 is an interface for performing data communication, and is connected to the communication line 6 in this embodiment. The communication unit 147 transmits and receives various data to and from the other sub projector 105 via the communication line 6 under the control of the control unit 170. In the present embodiment, the communication unit 147 is a wired interface that connects a cable (not shown) constituting the communication line 6. The communication unit 147 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 6 is constituted by a wireless communication line.

  Master projector 100A includes an image processing system. The image processing system is configured around a control unit 170 that performs overall control of the entire master projector 100A, and further includes an image processing unit 153, a frame memory 155, and a storage unit 160. The control unit 170, the image processing unit 153, and the storage unit 160 are connected to the internal bus 180.

  The image processing unit 153 expands the image data input from the image input I / F unit 151 in the frame memory 155 under the control of the control unit 170, and executes image processing on the expanded image data. Image processing executed by the image processing unit 153 includes, for example, resolution conversion (scaling) processing, frame rate conversion processing, shape correction processing, zoom processing, color tone correction processing, luminance correction processing, and the like. Of course, it is also possible to execute a combination of a plurality of processes.

The resolution conversion process is a process in which the image processing unit 153 converts the resolution of the image data in accordance with the resolution specified by the control unit 170, for example, the display resolution of the liquid crystal panel of the light modulation device 112.
The frame rate conversion process is a process in which the image processing unit 153 converts the frame rate of the image data to the frame rate specified by the control unit 170.
The shape correction process is a process in which the image processing unit 153 converts the image data in accordance with the correction parameter input from the control unit 170 and corrects the shape of the image projected on the screen SC.
The zoom process is a process in which the image processing unit 153 enlarges / reduces an image when zooming is instructed by an operation of the remote controller 5 or the operation panel 141.
The color tone correction process is a process for converting the color tone of the image data, and the image processing unit 153 changes the data of each pixel included in the image data in accordance with the color tone specified by the control unit 170. In this processing, the master projector 100A realizes a color tone suitable for watching a movie, a color tone suitable when the screen SC is installed in a bright environment, a color tone suitable for projection onto a non-white screen SC such as a blackboard, and the like. it can. In addition to the color tone correction process, contrast adjustment or the like may be performed.
The brightness correction process is a process in which the image processing unit 153 corrects the brightness of the image data. Through the luminance correction process, the luminance of the image data is corrected to a luminance corresponding to the light emission state of the light source unit 111, the brightness of the environment where the master projector 100A is installed, and the like.
The contents of the above-described processing executed by the image processing unit 153, the parameters, and the start and end timing of the processing are controlled by the control unit 170.
The image processing unit 153 reads out the processed image data from the frame memory 155 and outputs it to the light modulation device driving unit 122 as a display image signal.

  The storage unit 160 includes a nonvolatile memory such as a flash memory or an EEPROM. The storage unit 160 stores data processed by the control unit 170 and a control program executed by the control unit 170 in a nonvolatile manner. The storage unit 160 also stores setting values for various processes executed by the image processing unit 153.

  The control unit 170 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 160 in the RAM, and executes the expanded control program to control each unit of the master projector 100A.

  The control unit 170 includes a projection control unit 171, an imaging control unit 172, and an image quality correction unit 173 as functional blocks. These functional blocks are realized by the CPU executing a control program stored in the ROM or the storage unit 160. The image quality correction unit 173 corresponds to the “correction data generation unit” of the present invention.

  The projection control unit 171 adjusts the display mode of the image on the display unit 110 and executes the projection of the image onto the screen SC. Specifically, the projection control unit 171 controls the image processing unit 153 to perform image processing on the image data input from the image input I / F unit 151. At this time, the projection control unit 171 may read out parameters necessary for processing by the image processing unit 153 from the storage unit 160 and output them to the image processing unit 153.

  The imaging control unit 172 causes the imaging unit 145 to perform imaging, and acquires captured image data generated by the imaging unit 145. The imaging control unit 172 outputs the acquired captured image data to the image quality correction unit 173.

  Captured image data is input from the imaging control unit 172 to the image quality correction unit 173. This captured image data is hereinafter referred to as master captured image data (second captured image data). In addition, the image quality correction unit 173 receives captured image data captured by the sub projector 105 from the communication unit 147. This captured image data is hereinafter referred to as sub captured image data (first captured image). The communication unit 147 receives the sub captured image data transmitted from the sub projector 105 and outputs it to the control unit 170.

The image quality correction unit 173 sets a correction target value based on the input master captured image data and a plurality of sub captured image data.
For example, the image quality correction unit 173 determines the brightness of the master captured image data and the plurality of sub captured image data, and compares the determined brightness to set a target value for brightness adjustment. The image quality correction unit 173 converts the master captured image data and the plurality of sub captured image data into XYZ values in the XYZ color space, and calculates a target value for color tone adjustment (color correction) based on the converted XYZ values.

  In addition, the image quality correction unit 173 obtains correction data based on the difference between the set target value for brightness adjustment and the brightness of the master captured image data. The obtained correction data is referred to as first correction data. Further, the image quality correction unit 173 obtains a plurality of correction data based on the difference between the set target value for color tone adjustment and the XYZ values of the sub-captured image data of each sub projector 105. Each of the obtained plurality of correction data is referred to as second correction data.

  In addition, the image quality correction unit 173 obtains correction data based on the difference between the set target value for brightness adjustment and the brightness of each of the master captured image data. The obtained correction data is referred to as third correction data. Also, the image quality correction unit 173 obtains a plurality of correction data based on the difference between the set target value for color tone adjustment and the XYZ values of the sub-captured image data of each sub projector 105. Each of the obtained correction data is referred to as fourth correction data.

  The image quality correction unit 173 transmits the obtained second correction data to the corresponding sub projector 105 via the communication unit 147. Further, the image quality correction unit 173 transmits the obtained fourth correction data to the corresponding sub projector 105 via the communication unit 147.

FIG. 3 is a flowchart showing a first operation of master projector 100A.
The image quality correction unit 173 of the master projector 100A monitors the input from the input processing unit 143 and determines whether an instruction to start image quality adjustment has been received by the operation panel 131 or the remote controller 5 (step S1). If the determination is negative (step S1 / NO), the image quality correction unit 173 waits until an image quality adjustment start instruction is received from the operation panel 131 or the remote controller 5.

When the determination in step S1 is affirmative (step S1 / YES), the image quality correction unit 173 performs processing for associating the captured image data captured by the imaging unit 145 with the liquid crystal panel of the light modulation device 112. First, the image quality correction unit 173 projects a pattern image on the screen SC (step S2). The pattern image data is, for example, a lattice pattern, and is image data in which predetermined marks are formed at the four corners of the pattern image data. The predetermined marks are used when detecting the four corners of the pattern image data.
The image quality correction unit 173 reads the pattern image data from the storage unit 160 and causes the image processing unit 153 to process it. The image processing unit 153 develops and processes the input pattern image data in the frame memory 155, and outputs the processed pattern image data to the display unit 110 as display image data. The display unit 110 projects an image based on the input display image data (pattern image data) on the screen SC. A pattern image which is an image based on the pattern image data projected by the projector 100 is displayed on the screen SC. The pattern image is projected onto the area of the screen SC on which the projection image 10A shown in FIG. 1 is projected.

  Next, the image quality correction unit 173 instructs the imaging control unit 172 to generate captured image data. The imaging control unit 172 controls the imaging unit 145 to image the screen SC direction, and generates captured image data (step S3). The imaging control unit 172 outputs the generated captured image data to the image quality correction unit 173. When the captured image data is input, the image quality correction unit 173 determines the coordinates in the input captured image data (hereinafter referred to as imaging coordinates) and the coordinates on the liquid crystal panel of the light modulation device 112 (hereinafter referred to as panel coordinates). Correlate (step S4). Specifically, the image quality correction unit 173 detects the marks of the pattern image captured in the captured image data, specifies the positions of the four corners of the pattern image captured in the captured image data, and the pixel positions of the four corners in the captured image data. Is identified. Next, the image quality correction unit 173 identifies the pixel position of the liquid crystal panel where the mark of the pattern image data is developed, and associates the pixel position in the captured image data with the pixel position in the liquid crystal panel. Thereby, an imaging coordinate and a panel coordinate are matched.

  The pixel position of the liquid crystal panel where the mark formed in the pattern image data is developed is set in advance, for example. You may get it. Further, when the image processing unit 153 develops the pattern image in the frame memory 155, the pixel position of the liquid crystal panel is specified based on the pixel position of the frame memory 155 where the mark is developed, and the pixel position of the liquid crystal panel is indicated. Information may be output to the controller 170. Information that associates the pixels of the frame memory 155 with the pixels of the liquid crystal panel is prepared in advance and is stored in the storage unit 160, for example.

Next, the image quality correction unit 173 selects one sub projector 105 from the plurality of sub projectors 105. The image quality correction unit 173 transmits the projection of the pattern image on the screen SC and the instruction for associating the imaging coordinates with the pattern coordinates to the selected sub projector 105 (step S5).
Receiving the instruction, the sub-projector 105 performs the same operations as those in steps S2 to S4 performed by the master projector 100A, and associates the imaging coordinates with the pattern coordinates. When the association between the imaging coordinates and the pattern coordinates is completed, the sub projector 105 notifies the master projector 100A of the completion of the association.

The image quality correction unit 173 of the master projector 100A waits until a completion notification is received from the sub-projector 105 that instructed the association in step S5 when the completion notification has not been received (step S6 / NO).
In addition, when the image quality correction unit 173 of the master projector 100A receives a completion notification from the sub projector 105 (step S6 / YES), it determines whether there is another sub projector 105 that has not been selected (step S7). ).
In the case of an affirmative determination (step S7 / YES), the image quality correction unit 173 transmits the projection of the pattern image onto the screen SC and the instruction for associating the imaging coordinates with the pattern coordinates to the non-selected sub projector 105. (Step S5). If the determination is negative (step S7 / NO), the image quality correction unit 173 projects the brightness adjusted image on the screen SC (step S8). The brightness adjustment image is a single color raster image of each of R, G, and B colors. The gradation of the brightness adjustment image is set to the maximum gradation among the gradations that can be set. The storage unit 160 stores brightness adjustment image data that is image data for projecting a brightness adjustment image on the screen SC.

  The image quality correction unit 173 reads the brightness adjustment image data from the storage unit 160, causes the image processing unit 153 to process it, and causes the display unit 110 to project it onto the screen SC. An image based on the brightness adjustment image data, that is, a brightness adjustment image is projected on the screen SC.

The image quality correction unit 173 instructs the imaging control unit 172 to generate captured image data. The imaging control unit 172 controls the imaging unit 145 to image the screen SC direction, and generates captured image data (step S9). The imaging control unit 172 outputs the generated captured image data to the image quality correction unit 173 as master captured image data. Steps S8 and S9 correspond to the “second captured image generation step” of the present invention.
The image quality correction unit 173 projects the R brightness adjustment image onto the screen SC to generate master captured image data, and then projects the G brightness adjustment image onto the screen SC to generate master captured image data. . Finally, the image quality correction unit 173 projects the brightness adjustment image of B on the screen SC to generate master captured image data.

  When the image quality correction unit 173 generates captured image data with all the colors R, G, and B, the image quality correction unit 173 selects one sub projector 105 from among the plurality of sub projectors 105. The image quality correction unit 173 instructs the selected sub projector 105 to capture a brightness adjustment image (step S10).

  The sub projector 105 instructed to generate the captured image projects the R brightness adjustment image onto the screen SC to generate sub captured image data. Next, the sub projector 105 projects the G brightness adjustment image on the screen SC to generate sub captured image data. Finally, the sub projector 105 projects the brightness adjustment image of B on the screen SC to generate sub captured image data. This process corresponds to the “first captured image generation step” of the present invention.

  When the sub-projector 105 generates the sub-captured image data in all the colors R, G, and B, the sub-projector 105 acquires the pixel value of the pixel of the sub-captured image data corresponding to the panel coordinates associated in step S4. The sub projector 105 transmits the acquired pixel value of each panel coordinate to the master projector 100A together with the corresponding coordinate value of the panel coordinate. This process corresponds to the “first transmission step” of the present invention.

  If no pixel value is received from the selected sub projector 105 (step S11 / NO), the image quality correction unit 173 of the master projector 100A stands by until a pixel value is received. When the pixel value is received (step S11 / YES), the image quality correction unit 173 determines whether there is another sub-projector 105 that has not been selected (step S12). If the determination is affirmative (step S12 / YES), the image quality correction unit 173 instructs the sub projector 105 that has not been selected to capture a brightness adjustment image (step S10). If the determination is negative (step S12 / NO), the image quality correction unit 173 sets a target value for brightness adjustment (step S13). The process of step S13 corresponds to the “target value setting step” of the present invention.

  The image quality correction unit 173 acquires the pixel value of the pixel corresponding to each panel coordinate from the master captured image data generated in step S9. Next, the image quality correction unit 173 obtains, for each panel coordinate, the luminance when the acquired pixel value is color-converted so as to have a preset color. The image quality correction unit 173 adds the R pixel value, the G pixel value, and the B pixel value of the pixels having the same panel coordinates, and calculates a white pixel value for each panel coordinate. The image quality correction unit 173 obtains an average value of the calculated pixel values of each panel coordinate, and uses the obtained average value as luminance information of the master captured image data.

  Similarly, the image quality correction unit 173 adds the R pixel value, the G pixel value, and the B pixel value of the pixel having the same panel coordinates to the pixel value input from each sub projector 105, thereby obtaining a white color. Are calculated for each panel coordinate. Then, the image quality correction unit 173 uses the calculated average value of the pixel values of the panel coordinates as the luminance information of the sub captured image data. The image quality correction unit 173 calculates the luminance information of the sub captured image data for each sub projector 105.

  The image quality correction unit 173 compares the luminance information of the master captured image data with the luminance information generated from the sub captured image data captured by each sub projector 105, and selects the luminance information having the lowest luminance. The image quality correction unit 173 sets the selected luminance information with the lowest luminance as a target value for luminance adjustment (step S13).

Next, the image quality correction unit 173 calculates first correction data and second correction data based on the set target value for luminance adjustment (step S14). The image quality correction unit 173 obtains a difference between the set target value for luminance adjustment and other luminance information, and uses the obtained difference as first correction data or second correction data. The process of step S14 corresponds to the “first correction data generation step and second correction data generation step” of the present invention.
The image quality correction unit 173 does not generate the first correction data when the luminance information of the master captured image data is selected as the target value for luminance adjustment. In addition, the image quality correction unit 173 obtains the difference between the luminance information of the master captured image data set as the target value for luminance adjustment and the luminance information of each sub captured image data, and sets the second correction data for each. calculate.

  In addition, when the luminance information of the sub-captured image data is selected as the luminance adjustment target value, the image quality correction unit 173 does not generate the second correction data corresponding to the sub projector 105 selected as the luminance adjustment target value. Further, the image quality correction unit 173 calculates the first correction data by obtaining the difference between the luminance information of the sub-captured image data set as the target value for luminance adjustment and the luminance information of the master captured image data. Further, the image quality correction unit 173 calculates the difference between the luminance information of the sub-captured image data set as the target value for luminance adjustment and the luminance information of the other sub-captured image data not selected as the target value for luminance adjustment. And the second correction data is obtained for each.

When generating the first correction data and the second correction data, the image quality correction unit 173 transmits the generated second correction data to the corresponding sub projector 105 (step S15). This process corresponds to the “second transmission step” of the present invention.
When receiving the second correction data from the master projector 100A, the sub projector 105 adjusts the light amount of the light source unit 111 of the sub projector 105 using the received second correction data.
In addition, the master projector 100A adjusts the light amount of the light source unit 111 of the master projector 100A using the generated first correction data, and performs brightness adjustment (step S16).

Next, the master projector 100A starts color tone adjustment.
The image quality correction unit 173 of the master projector 100A projects the color tone adjustment image on the screen SC (step S17). The tone adjustment image is a single color raster image of each color of R, G, and B, and is prepared with a plurality of preset gradations (for example, eight gradations).
The storage unit 160 stores color tone adjusted image data that is image data for projecting a color tone adjusted image on the screen SC.

  The image quality correction unit 173 reads out the R tone-adjusted image data from the storage unit 160, causes the image processing unit 153 to process it, and causes the display unit 110 to project it onto the screen SC. An R color tone adjustment image is projected onto the screen SC.

The image quality correction unit 173 instructs the imaging control unit 172 to generate master captured image data obtained by capturing the color tone adjustment image (step S18). Steps S17 and S18 correspond to the “second captured image generation step” of the present invention.
Next, the image quality correction unit 173 changes the gradation of the R tone adjustment image projected onto the screen SC, and causes the imaging control unit 172 to generate master captured image data. When the image quality correction unit 173 generates master captured image data by projecting an R color tone adjustment image with all gradations, the image quality correction unit 173 changes the color tone adjustment image projected on the screen SC to a G color tone adjustment image. Master captured image data is generated while changing the key. When the image quality correction unit 173 generates master captured image data by projecting the G tone adjustment image with all the gradations, the image quality correction unit 173 changes the tone adjustment image projected on the screen SC to the B tone adjustment image, and Master captured image data is generated while changing the key.

Next, the image quality correction unit 173 selects the sub projector 105 and instructs the selected sub projector 105 to capture a color tone adjustment image (step S19).
Receiving the instruction, the sub projector 105 captures the projected color adjustment image while changing at least one of the color and gradation of the color adjustment image projected on the screen SC, and generates sub captured image data. The processing so far corresponds to the “first captured image generation step” of the present invention.
In response to the instruction, the sub-projector 105 acquires pixel values corresponding to the panel coordinates from the sub-captured image data generated for each of R, G, and B colors and for each gradation. The sub-projector 105 converts the acquired pixel value at the panel coordinates into an XYZ value in the XYZ color space and transmits it to the master projector 100A. This process corresponds to the “first transmission step” of the present invention.

  When the pixel value is not received from the sub projector 105 (step S20 / NO), the image quality correction unit 173 of the master projector 100A stands by until the pixel value is received. In addition, when receiving the pixel value (step S20 / YES), the image quality correction unit 173 of the master projector 100A determines whether there is another sub-projector 105 that has not been selected (step S21). If the determination is affirmative (YES in step S21), the image quality correction unit 173 returns to step S19, and instructs the sub projector 105 that has not been selected to capture a color adjustment image (step S19).

  If the determination in step S21 is negative (step S21 / NO), the image quality correction unit 173 sets a target value for color tone adjustment (step S22). The process of step S22 corresponds to the “target value setting step” of the present invention. The target value for color tone adjustment may be, for example, one captured image data selected from the master captured image data or the sub captured image data, and the pixel value (XYZ value) at the center of the selected captured image data. The target value for color tone adjustment may be a target value (XYZ value) when gamma correction is performed. Further, the target value for color tone adjustment may be a target value set in advance for each of R, G, and B colors and for each gradation.

  When the target value for color tone adjustment is set, the image quality correction unit 173 acquires the pixel value of the pixel corresponding to the panel coordinates from the master captured image data generated in step S18, and the pixel value corresponding to the acquired panel coordinates. Pixel values are converted to XYZ values in the XYZ color space.

Next, the image quality correction unit 173 calculates third correction data and fourth correction data (step S23). The process of step S23 corresponds to the “first correction data generation step and second correction data generation step” of the present invention.
The image quality correction unit 173 compares the XYZ value of each panel coordinate generated from the master captured image data with the target value for color tone adjustment, and generates third correction data for each panel coordinate. The image quality correction unit 173 generates third correction data for each of R, G, and B colors and for each gradation.
In addition, the image quality correction unit 173 compares the XYZ values of the panel coordinates input from the sub projectors 105 with the target values for color tone adjustment, and generates fourth correction data for each sub projector 105. Generate for each panel coordinate. The image quality correction unit 173 generates fourth correction data for each panel coordinate for each color of R, G, and B and for each gradation.

The image quality correction unit 173 transmits the generated fourth correction data to the corresponding sub projector 105 (step S24). The process of step S24 corresponds to the “second transmission step” of the present invention.
Upon receiving the fourth correction data transmitted from the master projector 100A, each sub projector 105 outputs the received fourth correction data to the image processing unit 153. The image processing unit 153 of each sub projector 105 corrects the color tone of the image data supplied from the image supply device 200 using the fourth correction data.
Similarly, the image quality correction unit 173 of the master projector 100A outputs the generated third correction data to the image processing unit 153. The image processing unit 153 of the master projector 100A corrects the color tone of the image data supplied from the image supply device 200 using the generated third correction data (step S25).

  In the above description, brightness adjustment and color tone adjustment are performed by separate processes, but brightness adjustment and color tone adjustment may be performed by a single process. That is, based on the same master captured image data and sub captured image data, a target value for luminance adjustment for correcting the brightness is set, and a target value for color tone adjustment for adjusting the color tone is set.

FIG. 5 is a flowchart showing an operation of performing brightness adjustment and color tone adjustment in a single process. As a pre-stage of the flow shown in FIG. 5, steps S1 to S7 shown in FIG. 3 are executed, and the imaging coordinates and the panel coordinates are associated in the master projector 100A and the sub projector 105. To do.
Moreover, since the procedure to step S31-35 shown in FIG. 5 is the same as the procedure to step S17-S21 shown in FIG. 4, description is abbreviate | omitted.
Note that the tone adjustment image projected in step S31 in FIG. 5 is the same image as the color tone adjustment image projected in step S17 in FIG. That is, the gradation adjustment image is a single color raster image of each color of R, G, and B, and is prepared with a plurality of gradations (for example, eight gradations) set in advance.

The image quality correction unit 173 sets a target value for brightness adjustment based on the master captured image data and the sub captured image data obtained by capturing the gradation adjusted image with the gradation set to the maximum.
As described in step S <b> 13 shown in FIG. 3, the image quality correction unit 173 calculates a white pixel value for each panel coordinate, and calculates the average value of the calculated pixel values of each panel coordinate as luminance information of the captured image data. To do. Then, the image quality correction unit 173 sets the luminance information with the lowest luminance as a target value for luminance adjustment (step S36). Next, the image quality correction unit 173 obtains correction data for each based on the set target value for luminance adjustment (step S37). The correction data generated here is not correction data for adjusting the light amount of the light source unit 111 but data for correcting the brightness of the projected image by correcting the image data.

Further, a target value for color tone adjustment is set based on master captured image data and sub captured image data obtained by capturing a gradation adjustment image of each gradation. As described in step S22 shown in FIG. 4, the image quality correction unit 173 sets a target value for color tone adjustment (step S36).
When the target value for color tone adjustment is set, the image quality correction unit 173 compares the XYZ values of each panel coordinate generated from the master captured image data with the target value for color tone adjustment, and generates correction data for each panel coordinate. (Step S37). Similarly, the image quality correction unit 173 compares the XYZ value of each panel coordinate generated from the sub-captured image data with the target value for color tone adjustment, and generates correction data for each panel coordinate (step S37). This correction data is also data for correcting the color tone of the projected image by correcting the image data.

The image quality correction unit 173 transmits the generated correction data to each sub projector 105 (step S38).
Upon receiving the correction data transmitted from the master projector 100 </ b> A, each sub projector 105 outputs the received correction data to the image processing unit 153. The image processing unit 153 of each sub projector 105 corrects the image data supplied from the image supply device 200 using the correction data, and corrects the brightness and color tone of the projected image.
Similarly, the image quality correction unit 173 of the master projector 100A outputs the generated correction data to the image processing unit 153. The image processing unit 153 of the master projector 100A corrects the image data supplied from the image supply device 200 using the generated correction data, and corrects the brightness and color tone of the projected image (step S39).

The second operation of the master projector 100A will be described with reference to the flowchart shown in FIG. This flow shows an operation performed by the master projector 100A after adjusting the brightness and color of the projected image according to the flow shown in FIGS. 3 and 4 or FIG.
First, the image quality correction unit 173 of the master projector 100A projects a white image on the screen SC (step S41). The image quality correction unit 173 instructs all the sub projectors 105 to project a white image. Each sub-projector 105 projects a white image on the screen SC according to an instruction from the master projector 100A (step S41).

  Next, the image quality correction unit 173 of the master projector 100A causes the imaging control unit 172 to generate captured image data obtained by capturing a white image projected on the screen SC (step S42). It is assumed that the captured image data captured by the imaging unit 145 of the master projector 100A includes at least the overlapping areas A, B, and E shown in FIG.

Next, the image quality correction unit 173 instructs all the sub projectors 105 to generate captured image data.
Each sub projector 105 captures the screen SC on which the white image is projected in accordance with an instruction from the master projector 100A, and generates captured image data (step S42).
It is assumed that the captured image data captured by the imaging unit 145 of the projector 100B includes at least the overlapping areas A, C, and E shown in FIG. It is assumed that the captured image data captured by the imaging unit 145 of the projector 100C includes at least the overlapping regions B, D, and E shown in FIG. It is assumed that the captured image data captured by the imaging unit 145 of the projector 100D includes at least the overlapping regions C, D, and E shown in FIG.
Each sub projector 105 transmits the generated captured image data to the master projector 100A (step S43). Each sub projector 105 may add information that associates the imaging coordinates generated in step S4 shown in FIG. 3 and the panel coordinates to the captured image data obtained by capturing the white image, and transmits the information to the master projector 100A. .

  Next, the image quality correction unit 173 of the master projector 100A detects the overlapping area based on the captured image data of the master projector 100A and each sub projector 105 (step S44). For example, the image quality correction unit 173 converts the pixel value of the pixel corresponding to the panel coordinates of the captured image data into luminance. The image quality correction unit 173 detects the overlapping area based on the converted brightness of each panel coordinate. The brightness of the overlapping areas A, B, C, D, and E where the images of the plurality of projectors 100 are superimposed is higher than the brightness of the area where the image of one projector 100 is projected. Further, the superimposition area E has the highest luminance in the superimposition area E, and the superimposition areas A, B, C, and D have substantially the same luminance.

When the image quality correction unit 173 detects the superimposed region, the image quality correcting unit 173 sets a target brightness value based on the detected luminance gradient in the superimposed region (step S45). The image quality correction unit 173 sets the brightness target value so that the change in brightness becomes moderate at the boundary between the superimposed region and other regions. The other area is an area where an image of one projector 100 is projected.
In addition, the image quality correction unit 173 is configured so that the change in brightness becomes moderate at the boundary between the overlapping region E on which the images of the four projectors 100 are projected and the other overlapping regions A, B, C, and D. Set the target value.

  Next, the image quality correction unit 173 calculates correction data for correcting the luminance gradient of the projection area where each projector 100 projects an image, based on the set brightness target value (step S46).

Next, the image quality correction unit 173 transmits the generated correction data to the corresponding sub projector 105.
Each sub-projector 105 corrects the image data using the correction data received from the master projector 100A, and corrects the brightness gradient so that the change in brightness becomes moderate at the boundary between the superimposed region and other regions. (Step S47). Further, the image quality correction unit 173 of the master projector 100A corrects the image data using the calculated correction data, and the luminance gradient so that the change in brightness becomes moderate at the boundary between the superimposed region and other regions. Is corrected (step S47).

  Next, the image quality correction unit 173 of the master projector 100A performs black level correction. The image quality correction unit 173 of the master projector 100A projects a black image on the screen SC (step S48). The image quality correction unit 173 instructs all the sub projectors 105 to project a black image. Each sub-projector 105 projects a black image on the screen SC according to an instruction from the master projector 100A (step S48).

Next, the image quality correction unit 173 of the master projector 100A causes the imaging control unit 172 to generate captured image data obtained by capturing the projected black image (step S49). Further, the image quality correction unit 173 instructs all the sub projectors 105 to generate captured image data. Each sub projector 105 images the screen SC on which the black image is projected in accordance with an instruction from the master projector 100A, and generates captured image data (step S49). Each sub projector 105 transmits the generated captured image data to the master projector 100A.
Each sub projector 105 transmits the generated captured image data to the master projector 100A. Each sub projector 105 may add information in which the imaging coordinates generated in step S4 shown in FIG. 3 and the panel coordinates are associated with the captured image data obtained by capturing the black image, and transmit the information to the master projector 100A. .

  Next, the image quality correction unit 173 of the master projector 100A detects the overlapping area based on the captured image data of the master projector 100A and each sub projector 105 (step S51). The image quality correction unit 173 detects the overlapping region by the same process as in step S44.

  Next, the image quality correction unit 173 of the master projector 100A sets a target value for black level correction based on the luminance information of all captured image data (step S52). The image quality correction unit 173 selects the highest luminance from all the captured image data, and sets the selected luminance as a target value for black level correction.

Next, the image quality correction unit 173 generates correction data based on the set target value for black level correction (step S53). The image quality correction unit 173 generates correction data for each of the plurality of captured image data input from the plurality of sub-projectors 105 and the image data captured by the master projector 100A.
For example, the image quality correction unit 173 converts the pixel value at the panel coordinates of the captured image data into luminance, and generates correction data based on the difference between the luminance for each converted panel coordinate and the set target value for black level correction. To do.

  The image quality correction unit 173 transmits the generated correction data to the corresponding sub projector 105. The sub projector 105 corrects the black level of the image data using the input correction data (step S54). Also, the image quality correction unit 173 corrects the black level of the image data using the generated correction data (step S54).

  As described above, in the present embodiment, the first correction for setting the correction target value based on the master captured image data and the sub captured image data, and correcting the master captured image data based on the set correction target value. Data and third correction data are generated, and second correction data and fourth correction data for correcting the sub-captured image are generated. Therefore, the image projected by each projector 100 can be corrected to make the image quality uniform.

  Further, first correction data for setting a correction target value based on brightness information indicating the brightness of the master captured image data and the sub captured image data, and correcting the master captured image data based on the set correction target value. And second correction data for correcting the sub-captured image is generated. Therefore, the brightness of the projection image projected by each projector 100 can be corrected to make the brightness of the projection image uniform.

  Further, a correction target value is set based on the color information indicating the colors of the master captured image data and the sub captured image data, and third correction data for correcting the master captured image is generated based on the set correction target value. Then, fourth correction data for correcting the sub-captured image is generated. Therefore, the color of the projection image projected by each projector 100 can be corrected to make the color of the projection image uniform.

  Further, the master projector 100A detects an overlapping area where the projection image of the sub projector 105 and the projection image of the master projector 100A overlap based on the master captured image data. Then, the master projector 100A generates brightness information indicating the brightness of the detected overlapping area, and sets a target value for brightness correction based on the generated brightness information. Therefore, it is possible to set a target value for correcting the brightness, reflecting the brightness of the overlapping area.

  In addition, the master projector 100A generates a target value for the brightness of the overlapping area where the projection image of the sub projector 105 and the projection image of the master projector 100A overlap. The master projector 100A obtains correction data for correcting the luminance gradient of the sub projector 105 in the overlapping area based on the master captured image data and the target value of the brightness of the overlapping area. Similarly, the master projector 100A obtains correction data for correcting the luminance gradient of the master projector 100A in the overlapping area based on the sub-captured image data and the target value of the brightness of the overlapping area. By correcting the luminance gradient in the overlapping area, it is possible to reduce the change in brightness at the boundary of the projection image of each projector.

  In addition, the projector 100 sequentially projects R, G, and B images having the same gradation to generate captured image data, and then changes the gradation and sequentially applies the R, G, and B images having the changed gradation. Projected image data is generated by projecting. Therefore, it is possible to generate captured image data by projecting R, G, B images of the same gradation in a short time. The projector 100 changes in brightness of the light source as the temperature of the light source included in the projector 100 changes. For this reason, by projecting R, G, and B images having the same gradation within a short time, it is possible to reduce the influence of the brightness change on the generated captured image.

The above-described embodiment is a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the light modulation device 112 that modulates the light emitted from the light source has been described by taking as an example a configuration using three transmissive liquid crystal panels corresponding to RGB colors. The invention is not limited to this. For example, a configuration using three reflective liquid crystal panels may be used, or a method in which one liquid crystal panel and a color wheel are combined may be used. Alternatively, a system using three digital mirror devices (DMD), a DMD system combining one digital mirror device and a color wheel, or the like may be used. When only one liquid crystal panel or DMD is used as the light modulation device, a member corresponding to a synthetic optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel and the DMD, any light modulation device capable of modulating light emitted from the light source can be employed without any problem.

In the above-described embodiment, the front projection type projector 100 that projects from the front of the screen SC is shown as the projector 100, but the present invention is not limited to this.
Moreover, each function part shown in FIG. 2 shows a functional structure, and a specific mounting form is not particularly limited. That is, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to adopt a configuration in which the functions of a plurality of function units are realized 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. In addition, the specific detailed configuration of each other part of the projector 100 can be arbitrarily changed without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Image projection system, 5 ... Remote control, 6 ... Communication line, 100, 100A, 100B, 100C, 100D ... Projector, 105 ... Sub projector (1st projector), 110 ... Display part (1st projection part, 2nd projection) 111) light source unit, 112 ... light modulation device, 113 ... projection optical system, 121 ... light source driving unit, 122 ... light modulation device driving unit, 141 ... operation panel, 142 ... remote control light receiving unit, 143 ... input processing unit 145: Imaging unit (first imaging unit, second imaging unit), 147 ... Communication unit (first transmission unit, second transmission unit), 151 ... Image input I / F unit, 153 ... Image processing unit, 155 ... Frame memory, 160 ... storage unit, 170 ... control unit, 171 ... projection control unit, 172 ... imaging control unit, 173 ... image quality correction unit (correction data generation unit), 200 ... image supply device, SC Screen.

Claims (7)

A first captured image generation step of projecting an image in the first projector and capturing the projected image to generate a first captured image;
A first transmission step of transmitting the first captured image from the first projector to a second projector;
A second captured image generation step of projecting an image in the second projector and capturing the projected image to generate a second captured image;
A target value setting step of setting a correction target value based on the first captured image and the second captured image by the second projector;
A first correction data generating step for obtaining first correction data based on a difference between the first captured image and the target value by the second projector;
A second correction data generation step of obtaining second correction data based on the difference between the second captured image and the target value by the second projector;
A second transmission step of transmitting the first correction data from the second projector to the first projector;
An image quality correction method comprising: In the target value setting step, the second projector generates brightness information indicating the brightness of the projection image from the first captured image and the second captured image, respectively, and based on the generated brightness information. Set the brightness correction target value,
The second projector generates first correction data based on a difference between brightness information generated from the first captured image and the target value in the first correction data generation step,
The second projector generates second correction data based on a difference between brightness information generated from the second captured image and the target value in the second correction data generation step. The image quality correction method according to claim 1. In the target value setting step, the second projector generates color information indicating the color of the projection image from the first captured image and the second captured image, and performs color correction based on the generated color information. Set a target value for
The second projector generates first correction data based on a difference between the color information of the projection image generated from the first captured image and the target value in the first correction data generation step,
The second projector generates second correction data based on a difference between the color information of the projection image generated from the second captured image and the target value in the second correction data generation step; The image quality correction method according to claim 1.   In the target value setting step, the second projector detects an overlapping region where the projection image of the first projector and the projection image of the second projector overlap from the first captured image, and brightness of the overlapping region. 4. The image quality correction method according to claim 1, wherein a brightness correction target value is set based on the generated brightness information. Based on the first captured image and the second captured image in the target value setting step by the second projector, an overlapping region in which the projected image of the first projector and the projected image of the second projector overlap. Generate a brightness target value,
In the first correction data generation step, first correction data for correcting a luminance gradient of the first projector in the overlap region is obtained based on the first captured image and a target value of brightness of the overlap region;
Obtaining second correction data for correcting a luminance gradient of the second projector in the overlapping region based on the second captured image and a target value of brightness of the overlapping region in the second correction data generating step; The image quality correction method according to claim 1, wherein: In the first captured image generation step, the first projector sequentially projects a preset first gradation red image, green image and blue image, captures the sequentially projected images, and generates the first captured image. Generating, sequentially projecting a preset second gradation red image, green image and blue image, imaging the sequentially projected image to generate a first captured image,
In the second captured image generation step, the second projector sequentially projects the first gradation red image, green image, and blue image, captures the sequentially projected image, and generates a second captured image; The red image, the green image, and the blue image of the second gradation are sequentially projected, and a second captured image is generated by capturing the sequentially projected images. The image quality correction method described. An image projection system comprising a first projector and a second projector,
The first projector is
A first projection unit for projecting an image;
A first imaging unit that captures a range including an image projected by the first projection unit;
A first transmission unit that transmits the first captured image captured by the first imaging unit to the second projector,
The second projector is
A second projection unit for projecting an image;
A second imaging unit that captures a range including an image projected by the second projection unit;
A correction target value is set based on the second captured image captured by the second imaging unit and the first captured image received from the first projector, and the first captured image and the target value are set. A correction data generating unit that obtains first correction data based on the difference and obtains second correction data based on the difference between the second captured image and the target value;
A second transmitter for transmitting the first correction data to the first projector;
An image projection system comprising:

Images