JP6866915B2 - Image projection system and control method of image projection system - Google Patents

Description

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

Conventionally, there is known a technique of connecting images projected by a plurality of projectors to display one large image. When an image is projected by a plurality of projectors, it is known that the color of the image projected by each projector shifts due to individual differences of the projectors (see, for example, Patent Document 1). In the image projection display device of Patent Document 1, in order to correct the color difference between projectors, images having the highest gradation level are sequentially displayed on the screen in the order of red (R), green (G), and blue (B) for a plurality of projectors. It is projected and each captured image is sequentially captured by the color measurement system. Then, a correction matrix is obtained for each projector so that the XYZ values at the center positions of the projection surfaces of all the projectors are the same, and the input signal is corrected using the obtained correction matrix.

Japanese Unexamined Patent Publication No. 2002-72359

However, when the imaging device mounted on the projector captures the projection surface on which the image is projected and corrects the color shift of the images projected from the plurality of projectors, the imaging device of one projector uses the imaging device of the projection surface. It may not be possible to shoot everything. That is, since the projector is installed at a position preferable for image projection, it may not be possible to secure a sufficient distance between the photographing device and the projection surface, and it may not be possible to photograph the entire projection surface.
Further, when the color shift of an image is corrected by using a plurality of photographing devices mounted on a plurality of projectors, the photographing devices mounted on each projector have individual differences in sensitivity, so that the image is photographed by the photographing device. There is a problem that an error occurs in the shooting value.
The present invention has been made in view of the above circumstances, and an object of the present invention is to accurately correct the target color of an image projected by each projector when an image is projected by a plurality of projectors.

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

Further, in the present invention, the shooting value of the first position on the first shot image is set as the target color, and the shooting value of the second position on the second shot image is the same as the shooting value of the first position. The second projector is characterized in that the first correction data for correcting the projected image is obtained.
According to the present invention, it is possible to correct so that the shooting value of the first position on the first shot image is the target color and the shooting value of the second position on the second shot image is the target color. Therefore, when the image is projected by a plurality of projectors, the correction to the target color can be performed with high accuracy.

Further, according to the present invention, in the image projection system, the first projector captures the second position on the second captured image with the captured value at the first position on the first captured image as the target color. The first calculation unit that calculates the first correction data that corrects the projected image so that the value becomes the shooting value at the first position, and the first correction data calculated by the first calculation unit. , A transmission unit for transmitting to the second projector.
According to the present invention, the first correction data can be calculated in the first projector, and the calculated first correction data can be transmitted to the second projector.

Further, in the image projection system of the present invention, the first correction data is data for correcting the color of a predetermined point in the second captured image to the target color, and the second projector is the second. A second imaging unit that captures a range including at least a part of the second image projected by the projection unit is provided, and at least one of the second images projected by the second imaging unit by the second imaging unit. It is characterized in that the second correction data for correcting the color of a plurality of parts in the second image to the color of the predetermined point is obtained based on the third photographed image in which the part is photographed.
According to the present invention, based on the third captured image in which at least a part of the second image projected by the second projection unit is captured by the second imaging unit, the colors of a plurality of locations in the second image are set to a predetermined point. The second correction data to be corrected to color can be obtained. Therefore, the colors of a plurality of locations in the second image can be corrected to the colors of predetermined points.

Further, according to the present invention, in the image projection system, the first projector sets the colors of the plurality of points in the second image to the predetermined points based on the third captured image received from the second projector. It is characterized by including a second calculation unit for obtaining the second correction data to be corrected to the color of.
According to the present invention, the second correction data can be obtained in the first projector based on the third captured image captured by the second projector.

Further, according to the present invention, in the image projection system, the first projector captures the second position on the second captured image with the captured value at the first position on the first captured image as the target color. The first calculation unit and the first calculation unit calculate the first correction data for correcting the second image in the second projector so that the value becomes the shooting value at the first position. The second projector includes a transmission unit that transmits the first correction data to the second projector, and the second projector has a plurality of the first correction data in the second image based on the first correction data received from the first projector. It is characterized in that the second correction data for correcting the color of the predetermined point to the color of the predetermined point is obtained.
According to the present invention, the first correction data calculated by the first projector is transmitted to the second projector, and in the second projector, the colors of a plurality of places in the second image are set to predetermined points based on the first correction data. It is possible to obtain the second correction data to be corrected to the color of.

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 composed of a first projection unit that projects a first image and the first projection unit. The second projector includes at least a part of the projected first image and a first photographing unit that captures a range including at least a part of the second image projected by the second projector. The first projector is provided with a second projection unit that projects a second image, and is based on a first captured image obtained by capturing at least a part of the first image projected by the first projection unit. The third correction data for correcting the color of the projected image to the preset target color was obtained, and at least a part of the second image projected by the second projection unit was photographed by the first imaging unit. Based on the second captured image, the fourth correction data for correcting the color of the projected image of the second projector to the target color is obtained.
According to the present invention, based on the first captured image obtained by capturing the first image, the third correction data for correcting the color of the projected image of the first projector to the target color is obtained, and the second imaging in which the second image is captured is obtained. Based on the image, it is possible to obtain the fourth correction data that corrects the color of the projected image of the second projector to the target color. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the target color of the image projected by each projector.

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 composed of a first projection unit that projects a first image and the first projection unit. The second projector includes at least a part of the projected first image and a first photographing unit that captures a range including at least a part of the second image projected by the second projector. A range including a second projection unit that projects a second image, at least a part of the first image projected by the first projection unit, and at least a part of the second image projected by the second projector. A target color is determined based on the first captured image obtained by capturing at least a part of the first image projected by the first projection unit. The color of the projected image of the second projector is corrected to the target color based on the second captured image captured by the second imaging unit at least a part of the second image projected by the second projection unit. It is characterized in that the first correction data is obtained.
According to the present invention, a target color is set based on the first captured image in which the first image is captured, and the color of the projected image of the second projector is set as the target color based on the second captured image in which the second image is captured. The first correction data to be corrected can be obtained. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the target color of the image projected by each projector.

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 composed of a first projection unit that projects a first image and the first projection unit. The second projector includes at least a part of the projected first image and a first photographing unit that captures a range including at least a part of the second image projected by the second projector. A range including a second projection unit that projects a second image, at least a part of the first image projected by the first projection unit, and at least a part of the second image projected by the second projector. A second imaging unit for photographing the image, and based on the first imaging image obtained by capturing at least a part of the first image projected by the first projection unit by the first imaging unit, the first projector A third correction data for correcting the color of the projected image to a preset target color is obtained, and at least a part of the second image projected by the second projection unit is photographed by the second imaging unit. 2. Based on the captured image, the fourth correction data for correcting the color of the projected image of the second projector to the target color is obtained.
According to the present invention, based on the first captured image obtained by capturing the first image, the third correction data for correcting the color of the projected image of the first projector to the target color is obtained, and the second imaging in which the second image is captured is obtained. Based on the image, it is possible to obtain the fourth correction data that corrects the color of the projected image of the second projector to the target color. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the target color of the image projected by each projector.

The projector of the present invention includes a projection unit that projects a first image, at least a part of the first image projected by the projection unit, and at least a part of a second image projected by another projector. A target color is determined based on a photographing unit that captures images and at least a part of the first image projected by the projection unit based on the first captured image captured by the photographing unit, and the projection is performed by the other projector. Based on the second captured image obtained by capturing at least a part of the second image by the photographing unit, the first calculation unit for obtaining the first correction data for correcting the color of the projected image of the other projector to the target color. It is characterized by being prepared.
According to the present invention, a target color is set based on the first captured image obtained by capturing the first image, and another captured image based on a second captured image obtained by capturing at least a part of the second image projected by another projector. It is possible to calculate the first correction data that corrects the color of the projected image of the projector to the target color. Therefore, it is possible to accurately correct the target color of the image projected by the projector.

The projector of the present invention includes a projection unit that projects a first image, at least a part of the first image projected by the projection unit, and at least a part of a second image projected by another projector. The color of the projected image projected by the projection unit is preliminarily set based on the photographing unit that captures the image and the first captured image obtained by capturing at least a part of the first image projected by the projection unit. The third correction data to be corrected to the set target color is obtained, and the other projector is based on the second captured image obtained by capturing at least a part of the second image projected by the other projector by the photographing unit. It is characterized by including a first calculation unit for obtaining a fourth correction data for correcting the color of the projected image of the above to the target color.
According to the present invention, it is possible to calculate the third correction data for correcting the color of the projected image projected by the projection unit to a preset target color based on the first captured image obtained by capturing the first image. It is possible to calculate the fourth correction data that corrects the color of the projected image of the other projector to the target color based on the second captured image obtained by capturing at least a part of the second image projected by the other projector. .. Therefore, it is possible to accurately correct the target color of the image projected by the projector.

The control method of the image projection system of the present invention is a control method of an image projection system including a first projector and a second projector, and is a method of controlling at least a part of a first image projected by the first projector and the said. A step of photographing a range including at least a part of a second image projected by the second projector by the first photographing unit of the first projector, and a step of photographing at least a part of the first image by the first photographing unit of the first projector. The first step based on the step of determining the target color based on the first captured image captured by the photographing unit and the second captured image obtained by capturing at least a part of the second image by the first photographing unit of the first projector. 2. It is characterized by having a step of obtaining a first correction data for correcting the color of a projected image of a projector to the target color.
According to the present invention, a target color is set based on the first captured image of the first image captured by the first imaging unit, and the second image is based on the second captured image captured by the first imaging unit. It is possible to obtain the first correction data for correcting the color of the projected image of the projector to the target color. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the target color of the image projected by each projector.

The control method of the image projection system of the present invention is a control method of an image projection system including a first projector and a second projector, and is a method of controlling at least a part of a first image projected by the first projector and the said. A step of photographing a range including at least a part of the second image projected by the second projector by the first photographing unit of the first projector and the second photographing unit of the second projector, and at least one of the first images. A step of determining a target color based on a first captured image captured by the first imaging unit of the first projector, and a second captured image obtained by capturing at least a part of the second image by the second imaging unit. Based on the above, it is characterized by having a step of obtaining first correction data for correcting the color of the projected image of the second projector to the target color.
According to the present invention, a target color is set based on the first captured image obtained by capturing the first image, and at least a part of the second image projected by the second projector is captured by the second capture unit. Based on the above, the first correction data for correcting the color of the projected image of the second projector to the target color can be calculated. Therefore, when an image is projected by a plurality of projectors, it is possible to accurately correct the target color of the image projected by each projector.

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

System configuration diagram of the image projection system. The block diagram which shows the structure of a projector. The flowchart which shows the operation of the projector of 1st Embodiment. The flowchart which shows the operation of the projector of 1st Embodiment. The figure which shows the projection area and the shooting range of a projector. The figure which shows the photographed image data generated by the photographing part. The figure which shows the change for every gradation of the photographed value of photographed image data. The flowchart which shows the operation of the projector of 2nd Embodiment. The figure which shows the photographed image data generated by the photographing part. The principle explanatory drawing of the 2nd Embodiment. The figure for demonstrating the case of projecting an image by four projectors. The figure for demonstrating the operation of the modification.

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

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

FIG. 2 is a configuration diagram showing the configuration of the projector 100A. Since the projector 100A and the projector 100B have substantially the same configuration, the configuration of the 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 signal supplied from the image supply device 200 or an image based on image data stored in advance in the storage unit 170A described later on the screen SC. The image supply device 200 is used, 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. Be 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 are not shown), and inputs an image signal supplied from an image supply device 200 connected via the cable. The image input unit 151A converts the input image signal into image data and outputs it to the image processing unit 152A.
The interface circuit included in the image input unit 151A may be, for example, an interface for data communication such as Ethernet (registered trademark), IEEE1394, or USB. Further, the interface circuit included in the image input unit 151A may be an interface for image data such as MHL (registered trademark), HDMI (registered trademark), and DisplayPort.
Further, the image input unit 151A may be configured to include a VGA terminal into which an analog video signal is input and a DVI (Digital Visual Interface) terminal in 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 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, an optical modulation device 112A, and a projection optical system 113A.

The light source unit 111A includes a light source such as a xenon lamp, an ultrahigh pressure mercury lamp, an LED (Light Emitting Diode), or a laser light source. Further, the light source unit 111A may include a reflector and an auxiliary reflector that guide the light emitted by the light source to the light modulation device 112A. Further, the light source unit 111A includes a lens group for enhancing the optical characteristics of the projected light, a polarizing plate, or a dimming element that reduces the amount of light emitted by the light source on the path leading to the light modulator 112A (all of which are shown in the figure). Omitted) may be provided.

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

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

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

The projection optical system (first projection unit) 113A includes a lens group that projects the image light modulated by the optical modulation device 112A in the direction of the screen SC to form an image on the screen SC. Further, the projection optical system 113A 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 projector 100A includes an operation panel 131A and a processing unit 133A. The processing unit 133A is connected to the internal bus 180A.
The operation panel 131A, which functions as a user interface, displays various operation keys and a display screen composed of a liquid crystal panel. When the operation keys displayed on the operation panel 131A are operated, the processing unit 133A outputs the data corresponding to the operated keys to the control unit 160A. Further, the processing unit 133A causes the operation panel 131A to display various screens under the control of the control unit 160A.
Further, a touch sensor for detecting contact with the operation panel 131A is superposed on the operation panel 131A and integrally formed. The processing unit 133A detects the position of the operation panel 131A that the user's finger or the like touches as an input position, and outputs data corresponding to the detected input position to the control unit 160A.

Further, the projector 100A includes a remote controller light receiving unit 132A that receives an infrared signal transmitted from the remote controller 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 controller light receiving unit 132A, generates data indicating the operation content of the remote controller 5A, and outputs the data to the control unit 160A.

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

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

The projector 100A includes an image processing system. The image processing system is mainly composed of a control unit 160A that controls the entire projector 100A, and also 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 expands the image data input from the image input unit 151A into the frame memory 155A under the control of the control unit 160A. The image processing unit 152A receives, for example, resolution conversion (scaling) processing or resizing processing, distortion correction, shape correction processing, digital zoom processing, image hue and brightness of the image data expanded in the frame memory 155A. Perform processing such as adjustment. The image processing unit 152A executes the processing specified by the control unit 160A, and if necessary, performs the processing using the parameters input from the control unit 160A. Further, the image processing unit 152A can of course execute a plurality of the above processes in combination.
The image processing unit 152A reads the processed image data from the frame memory 155A and outputs it as display image data to the optical modulation device driving unit 122A.

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

Further, 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.

The projection control unit 161A adjusts the display mode of the image on the display unit 110A and executes the projection of the image on the screen SC.
Specifically, the projection control unit 161A controls the image processing unit 152A to perform image processing on the image data input from the image input unit 151A. At this time, the projection control unit 161A may read the parameters required for processing by the image processing unit 152A from the storage unit 170A and output them to the image processing unit 152A.
Further, the projection control unit 161A controls the light source driving unit 121A to light the light source of the light source unit 111A and adjust the brightness 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 shooting control unit 162A causes the shooting unit 140A to perform shooting, and acquires the shot image data shot by the shooting unit 140A.

The correction control unit (first calculation unit, second calculation unit) 163A has a hue (chromaticity) between the projection image projected by the projector 100A on the first projection area 141 and the projection image projected by the projector 100B on the second projection area 142. Adjust the color, especially the hue and saturation). The details of the correction control unit 163A will be described with reference to the flowcharts shown in FIGS. 3 and 4.

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

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

The control unit 160A of the projector 100A, which is the master machine, monitors the input of the processing unit 133A and determines whether or not the operation by the operation panel 131A or the remote controller 5A is accepted (step S1). If there is no data input from the processing unit 133A, the control unit 160A determines that the operation is not accepted (step S1 / NO), executes other processing until the data is input from the processing unit 133A, or inputs the data. Wait until there is.

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

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

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

Next, the correction control unit 163A causes the shooting control unit 162A to generate captured image data. The shooting control unit 162A controls the shooting unit 140A to shoot the screen SC direction and generate captured image data (step S5). When the correction control unit 163A finishes generating the captured image data by the imaging control unit 162A, the correction control unit 163A ends the projection of the pattern image onto the first projection area 141.

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

When the correction control unit 163A receives the notification signal notifying that the pattern image has been projected from the projector 100B, the correction control unit 162A causes the photographing control unit 162A to generate the captured image data. The shooting control unit 162A controls the shooting unit 140A to shoot the screen SC direction and generate captured image data (step S7).

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

FIG. 6 is a diagram showing captured image data generated by the photographing unit 140A.
In FIG. 6, (A) shows photographed image data (hereinafter, referred to as first photographed image data) in which the projector 100A projects a pattern image onto the first projection area 141, and (B) is the projector 100B. Indicates photographed image data (hereinafter, referred to as second photographed image data) in which a pattern image is projected onto the second projection area 142.
As shown in FIG. 6, the entire pattern image of the pattern image projected on the first projection area 141 is photographed by the photographing unit 140A, and the pattern image projected on the second projection area 142 is patterned by the photographing unit 140A. A part of the image is taken.

The first and second captured image data generated by the photographing unit 140A are input to the correction control unit 163A.
The correction control unit 163A detects the marks arranged at the grid points of the pattern image projected on the first projection region 141 from the input first captured image data, identifies the grid points, and identifies each grid. Identify the coordinates of the point. The specified coordinates are the coordinates in the first captured image data.
Next, the correction control unit 163A registers the coordinates of each grid point in the specified first captured image data in association with the coordinates of each grid point in the pattern image data stored in the storage unit 170A. To generate. As the information for identifying each grid point, the coordinates on the liquid crystal panel of the optical modulation device 112A may be used 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 and the coordinates of the liquid crystal panel on which each grid point of the pattern image data is drawn are associated.
The correction control unit 163A stores the first and second captured image data and the correspondence table in the storage unit 170A.

Next, the correction control unit 163A instructs the projection control unit 161A to project the adjustment image data. The projection control unit 161A reads out preset adjustment image data from the storage unit 170A, and displays an image based on the read adjustment image data (hereinafter referred to as an adjustment image (first image)) on the screen by the display unit 110A. The image is projected onto the first projection area 141 of the SC (step S8). The adjustment image data is monochrome raster image data prepared for each of the red (R), green (G), and blue (B) colors, and is prepared for each preset gradation.
When the adjustment image data is projected on the screen SC, the correction control unit 163A causes the shooting control unit 162A to generate the shooting image data. The shooting control unit 162A controls the shooting unit 140A to shoot the screen SC direction and generate captured image data (step S9). Hereinafter, the photographed image data obtained by photographing the first projection area 141 on which the adjustment image is projected is referred to as a third photographed image data (first photographed image).
The correction control unit 163A causes the projection control unit 161A to project images for adjusting all colors and all gradations onto the first projection area 141, and the imaging control unit 162A projects all the images projected onto the first projection area 141. Have them take an image for adjusting the color and all gradations.

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

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

When the correction control unit 163A of the projector 100A receives the notification signal from the projector 100B, the correction control unit 162A instructs the shooting control unit 162A to generate the shooting image data. The shooting control unit 162A controls the shooting unit 140A to shoot the screen SC direction and generate captured image data (step S13). Hereinafter, the photographed image data obtained by photographing the state in which the adjustment image is projected on the second projection area 142 is referred to as the fourth photographed image data (second photographed image).
The correction control unit 163A causes the projector 100B to project images for adjusting all colors and all gradations onto the first projection area 141, and the imaging control unit 162A projects all colors projected onto the second projection area 142. And all the gradation adjustment images are taken.

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

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

First, the correction control unit 163A selects a target color and gradation for generating a correction value. Next, the correction control unit 163A selects a grid point (hereinafter, referred to as a grid point A (first position)) on the pattern image data (step S16). The pattern image data is image data stored in the storage unit 170A. The grid points to be selected are arbitrary, but in this processing flow, the correction control unit 163A selects the grid points A located at the center of the pattern image data shown in FIG. 6 (A).

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

Next, the correction control unit 163A selects one grid point on the pattern image projected on the second projection area 142 from the second captured image data (step S18). The grid points to be selected are arbitrary, but in this processing flow, the correction control unit 163A selects the grid points B (second position) located in the center of the pattern image data shown in FIG. 6 (B).

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

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

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

As described above, in the first embodiment, the first projection area 141 and a part of the second projection area 142 are photographed by the photographing unit 140A of the projector 100A. Based on the captured image data captured by the photographing unit 140A, the captured values of the grid points of the first projection region 141 and the captured values of some grid points of the second projection region 142 are calculated, and the captured values of the second projection region 142 are calculated. A correction value for correcting the photographed value of the grid point to the photographed value of the grid point of the first projection region 141 is calculated.
Therefore, based on the captured image data captured by the photographing unit 140A, the captured values of the first projection region 141 and a part of the grid points of the second projection region 142 are calculated, and a part of the grids of the second projection region 142 are calculated. It is possible to calculate a correction value for correcting the imaged value of the point to the imaged value of the grid points of the first projection region 141. Therefore, it is possible to reduce the error included in the correction value as compared with the case where the correction value is calculated based on the captured image data captured by a plurality of photographing units.

[Second Embodiment]
The configuration of the image projection system 1 of the second embodiment is the same as that of the first embodiment shown in FIGS. 1 and 2. Therefore, the description of the configuration of the image projection system 1 of the second embodiment will be omitted.
In the second embodiment, the chromaticity (hue and saturation) of the image projected by the projector 100A on the first projection region 141 is not uniform, and the chromaticity of the image projected by the projector 100B on the second projection region 142 is not uniform. It is an embodiment when there is no such thing. That is, the chromaticity of the image drawn on the liquid crystal panel of the light modulation device 112A of the projector 100A is not uniform, and the chromaticity of the image drawn on the liquid crystal panel of the light modulation device 112B of the projector 100B is not uniform.

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

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

The correction control unit 163A selects a grid point as a reference for chromaticity correction from the pattern image data (step S31). The selected grid points are referred to as grid points A as in the first embodiment. The grid point A may be any grid point as long as it is a grid point on the pattern image data, but in this processing flow, the grid point located at the center of the pattern image data is the grid point A (FIG. 6 (A). ) Refer to). The grid point A is a grid point that serves as a reference for chromaticity correction, and the XYZ value of the grid point A is set as a target value, and the XYZ values of other grid points projected on the first projection region 141 are set as target values. Perform the correction process.

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

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

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

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

Next, the correction control unit 163A selects the sixth captured image data obtained by capturing the selected gradation and color adjustment image to be generated as the correction value from the captured image data acquired from the projector 100B.
Next, the correction control unit 163A specifies the position of each grid point of the second projection region 142 in the sixth captured image data (step S36). The correction control unit 163A specifies the position of each grid point of the second projection region 142 in the sixth captured image data by comparing the sixth captured image data with the fifth captured image data. The sixth captured image data is image data obtained by projecting an adjustment image onto the second projection region 142 and capturing the image by the photographing unit 140B of the projector 100B. The fifth captured image data is image data obtained by projecting a pattern image onto the second projection region 142 and capturing the image by the photographing unit 140B of the projector 100B.
Next, the correction control unit 163A acquires the captured value of the sixth captured image data at each grid point of the specified second projection region 142. When the photographed value is acquired, the correction control unit 163A converts the acquired photographed 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 each grid point of the specified second projection region 142, and corrects the XYZ value of the specified grid point B based on the second correction value. (Step S37). The correction control unit 163A calculates a correction amount based on the second correction value, and adds the calculated correction amount to the XYZ value of the grid point B. The correction amount based on the second correction value will be described with reference to FIG. The XYZ value of the grid point B to which the correction amount based on the second correction value is added becomes the correction target value in the second projection region 142.

Next, the correction control unit 163A corrects the XYZ values of the grid points (plurality of points) other than the grid point B of the second projection region 142 to the XYZ values of the grid point B (predetermined point) which is the target value. The correction value to be performed (hereinafter, referred to as a third correction value (second correction data)) is calculated (step S38). When the correction control unit 163A calculates the third correction value for correcting the chromaticity of each grid point in the second projection region 142, the calculated second correction value and the third correction value are transmitted to the projector 100B (step S39). ..

FIG. 10 is an explanatory diagram of the principle of the second embodiment. In FIG. 10, the vertical axis indicates the XYZ value, and the horizontal axis indicates the position of the grid points.
Unlike the first embodiment described above, the present embodiment uses two photographing units, the photographing unit 140A of the projector 100A and the photographing unit 140B of the projector 100B, as the photographing unit for generating the photographed image data.
If there is an individual difference in sensitivity between the camera included in the photographing unit 140A and the camera provided in the photographing unit 140B, an error is included in the shooting value calculated based on the generated captured image data, and the image projected by the projector 100B is displayed. It may not be possible to accurately match the chromaticity with the chromaticity of the image projected by the projector 100A.

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

Further, the XYZ value of the grid point B calculated from the captured image data of the photographing unit 140B is defined 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 the XYZ values (X 3} , Y ₃ , Z ₃ ) of the grid point B, and obtains the XYZ value obtained by adding the second correction value. 2 Set to the target value in the projection area 142. The value obtained by adding the correction amount α based on the second correction value to the XYZ values (X ₃ , Y ₃ , Z _{3 ) is defined as the XYZ value (X 4} , Y ₄ , Z ₄ ) of the point e.
The correction control unit 163A corrects the XYZ values of the other grid points of the second projection region 142 with _{the XYZ values (X 4} , Y ₄ , Z _{4) of this point e as the target values.}

For example, it is assumed that the XYZ value of the grid point C shown in FIG. 9 is the XYZ value (X ₅ , Y ₅ , Z _{5) of the point f shown in FIG.}
Correction control unit 163A, first, the difference in XYZ values of the grid point C of target _{(X 5, Y 5, Z} 5), serving as a reference XYZ values of the grid points B and _{(X 3, Y 3, Z} 3) Ask for. Let the obtained difference be the 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 grid point C.

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

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

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

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

[Modification 1]
In the second embodiment described above, the case where an image is projected by two projectors 100A and 100B has been described, but the number of projectors 100 is not limited to two.
FIG. 11 is a diagram for explaining a case where the chromaticity of the image projected by the four projectors is corrected. Operation when four projectors 100A, 100B, 100C and 100D are arranged adjacent to each other in the horizontal direction (horizontal direction) with reference to FIG. 11 and the chromaticity of the image projected by each projector 100 is corrected. Will be described. In this embodiment as well as in the first and second embodiments described above, the projector 100A, which is the master machine, acquires the captured image data generated by the other projectors 100B, 100C, and 100D, and the second and second embodiments. 4 The correction value of each grid point of the projection area 142, 143, 144 is calculated.

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

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

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

Next, the correction control unit 163A corrects the grid point R by calculating the shooting value (XYZ value) of the grid point R obtained from the shot image data generated by the shooting unit 140C of the projector 100C shooting the shooting range 147. Correct by the value r. Next, the correction control unit 163A sets a correction value (denoted as a correction value s) for correcting the shooting value (XYZ value) of the grid point S with the shooting value (XYZ value) of the corrected grid point R as a target value. calculate. The grid points S are grid points of the third projection region 143 included in the shooting range 146 of the projector 100B and the shooting range 147 of the projector 100C. Further, the shooting value (XYZ value) of the grid point S is a value calculated from the shot image data obtained by shooting the shooting range 147 by the shooting unit 140C of the projector 100C. The correction control unit 163A calculates the correction value s at the grid point S at each gradation set in the above-mentioned adjustment image.

The correction control unit 163A calculates the correction value t of the grid point T of the third projection region 143 and the correction value u of the grid point U of the fourth projection region 144 by the same procedure.
Further, when the correction control unit 163A calculates the correction value q of the grid point Q of the second projection region 142, the correction control unit 163A obtains the calculated correction value q and the photographed image data generated by the photographing unit 140B of the projector 100B. 2 The correction value of the other grid points of the projection area 142 is calculated. Further, the correction control unit 163A also calculates the correction values of the other grid points of the third projection region 143 and the correction values of the other grid points of the fourth projection region 144 in the same manner.

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

Further, in this modification 1, the case where the correction value of each grid point is calculated by the correction control unit 163A of the projector 100A has been described, but the correction value of the grid point R of the second projection region 142 is calculated by the projector 100B. You may. Further, the correction value of the grid point T in the third projection region 143 may be calculated by the projector 100C.
For example, when the correction control unit 163A of the projector 100A calculates the correction value q of the grid point Q, the calculated correction value q is transmitted to the projector 100B.
The correction control unit 163B of the projector 100B corrects the grid point Q received from the projector 100A by correcting the shooting value (XYZ value) of the grid point Q obtained from the shot image data generated by the shooting unit 140B shooting the shooting range 146. Correct by the value q.
Further, the correction control unit 163B calculates the correction value r for correcting the shooting value (XYZ value) of the grid point R with the shooting value (XYZ value) of the corrected grid point Q as the target value. The correction control unit 163B transmits the calculated correction value r to the projector 100C.
Hereinafter, in the same manner, the correction control unit 163C of the projector 100C receives the shooting value (XYZ value) of the grid point R obtained from the shot image data generated by the shooting unit 140C shooting the shooting range 147 from the projector 100B. It is corrected by the correction value r of the grid point R. Further, the correction control unit 163C calculates the correction value s for correcting the shooting value (XYZ value) of the grid point S with the shooting value (XYZ value) of the corrected grid point R as the target value. The correction control unit 163C transmits the calculated correction value s to the projector 100D.

[Modification 2]
In the first embodiment and the second embodiment described above, the projector 100A, which is a master machine, calculates the correction values of the grid points of the first projection region 141 and the second projection region 142.
In the second modification, the projector 100B calculates the correction value of each grid point in the second projection region 142.
When the correction control unit 163A of the projector 100A calculates the correction value of each grid point of the first projection area 141, the correction value of the grid point of the first projection area 141 that can be photographed by the photographing unit 140B of the projector 100B is set to the projector 100B. Send.

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

When the correction control unit 163B of the projector 100B receives the correction value j of the grid point J, the correction control unit 163B receives the shooting value (XYZ value) of the grid point J generated from the shot image data shot by the shooting unit 140B in the shooting range 146. It is corrected by the correction value j of the grid point J.
Further, the correction control unit 163B of the projector 100B sets the photographed value (XYZ value) of the corrected grid point J as the target value in the second projection region 142, and sets each grid point in the second projection region 142 (for example, FIG. 12). A correction value for correcting the imaging value of the indicated grid point K) is calculated.

Further, in addition to the correction value j at the grid point J, the correction control unit 163A of the projector 100A uses the shooting value (XYZ value) of the grid point J calculated from the shot image data shot by the shooting unit 140A as the second correction data. May be transmitted to the projector 100B.
In this case, the correction control unit 163B of the projector 100B has a shooting value (XYZ value) of the grid point J generated from the shot image data shot by the shooting unit 140B and a shooting value (XYZ value) of the grid point J received from the projector 100A. ) And the difference (hereinafter referred to as the difference value). The correction control unit 163B recognizes the calculated difference value as a difference in sensitivity between the camera of the photographing unit 140A and the camera of the photographing unit 140B.

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

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

Further, in the image projection system 1, the shooting value at the position of the grid point A of the third shot image data is set as the target color, and the shooting value at the position of the grid point B of the fourth shot image data is the shooting value of the grid point A. Therefore, the correction value for correcting the projected image in the projector 100B is obtained. Therefore, in the projector 100B, it is possible to correct the captured value at the position of the grid point B of the projected image so as to be the target color.

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

Further, the correction value is data for correcting the color at the position of the grid point B of the fourth captured image data to the target color, and the projector 100B uses at least a part of the adjustment image projected by the projection optical system 113B. A photographing unit 140B for photographing a including range is provided. The projector 100B sets the colors of the positions of the plurality of grid points of the adjustment image based on the sixth captured image data obtained by capturing at least a part of the adjustment image projected by the projection optical system 113B by the photographing unit 140B. 4 Obtain a third correction value for correcting the color at the position of the grid point B of the captured image data. Therefore, based on the sixth captured image data obtained by capturing at least a part of the adjustment image projected by the projection optical system 113B by the photographing unit 140B, the colors of the positions of the plurality of grid points of the adjustment image are set to the fourth captured image data. It is possible to obtain a third correction value for correcting the color at the position of the grid point B of.

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

The first and second embodiments described above and modifications thereof are preferred embodiments of the present invention. However, the present invention is not limited to this, and various modifications can be carried out within a range that does not deviate from the gist of the present invention.
For example, in the first and second embodiments described above, the projector 100A located on the left side is used as the master machine, but the projector 100 set as the master machine is not limited to the projector 100A located on the left side.

Further, in the first and second embodiments described above, the center of the first projection region 141 of the projector 100A (that is, the center of the liquid crystal panel) is set as the target values of chromaticity and brightness, but the first projection region 141 Other parts or the projection area of the projector 100 other than the projector 100A which is the master machine may be set as a target value of at least one of chromaticity and brightness. Further, a preset target value may be stored in the storage unit 170A, and a value read from the storage unit 170A may be set as the target value when adjusting the chromaticity and the brightness. Further, the user operates the operation panel 131A or the remote controller 5A to cause the projector 100A to shoot the screen SC by the shooting unit 140A, and set at least one target value of chromaticity and brightness based on the shot image data. However, the set target value can be stored in the storage unit 170A.
Further, different target values of chromaticity and brightness may be set depending on the position of the liquid crystal panel. For example, in the range where the images projected from the plurality of projectors 100 overlap, the target value is calculated from the captured image data captured by the photographing unit 140A, and in the other range, the target value stored in advance in the storage unit 170A is used. You may use it.

Hereinafter, the chromaticity value set in advance by the user by operating the operation panel 131A or the remote controller 5A is set as the target value, and the chromaticity of each grid point of the first projection area 141 and the second projection area 142 is set as the target value. A case of correction will be described. The storage unit 170A stores the target value of the chromaticity preset by this user.
The correction control unit 163A of the projector 100A instructs the projection control unit 161A to project an adjustment image on the first projection area 141 of the screen SC, and instructs the imaging control unit 162A to capture the projected adjustment image. The third photographed image data is generated.
Further, the correction control unit 163A instructs the projector 100B to project an adjustment image on the second projection area 142, and instructs the imaging control unit 162A to capture the projected adjustment image, and captures the fourth captured image data. To generate.

The correction control unit 163A corrects the captured value (XYZ value) of each grid point in the first projection region 141 to be the target value stored in the storage unit 170A based on the generated third captured image data. The correction value (third correction data) is calculated for each. Further, the correction control unit 163A sets the imaging value (XYZ value) of the grid points (for example, the grid points B shown in FIG. 6B) of the second projection region 142 based on the generated fourth captured image data. , A correction value (fourth correction data) to be corrected so as to be a target value stored in the storage unit 170A is calculated.
The correction control unit 163A calculates the correction value of each grid point of the first projection region 141 and the correction value of the grid point of the second projection region 142 for all RGB colors and all preset gradations. To do. Further, the correction control unit 163A also calculates the correction value of the gradation other than the preset gradation by the interpolation calculation based on the calculated correction value of the gradation. The correction control unit 163A corrects the imaging value (XYZ value) of each grid point of the first projection region 141 by using the calculated correction value of each grid point of the first projection region 141. Further, the correction control unit 163A transmits the calculated correction value of the grid points of the second projection region 142 to the projector 100B.

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

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

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

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

5A ... Remote control, 100 (100A (first projector), 100B (second projector), 100C, 100D) ... Projector, 110A, 110B ... Display unit, 111A, 111B ... Light source unit, 112A, 112B ... Optical modulator, 113A , 113B ... Projection optical system (first projection unit, second projection unit), 121A, 121B ... Light source drive unit, 122A, 122B ... Optical modulator drive unit, 131A, 131B ... Operation panel, 132A, 132B ... Remote control light receiving unit , 133A, 133B ... Processing unit, 140A, 140B ... Imaging unit (first imaging unit, second imaging unit), 151A, 151B ... Image input unit, 152A, 152B ... Image processing unit, 155A, 155B ... Frame memory, 160A , 160B ... Control unit, 161A, 161B ... Projection control unit, 162A, 162B ... Shooting control unit, 163A, 163B ... Correction control unit (first calculation unit, second calculation unit), 170A, 170B ... Storage unit 175A, 175B ... Communication unit (transmission unit), 180A, 180B ... Internal bus, 200 ... Image supply device.

Claims (4)

An image projection system including a first projector and a second projector.
The first projector is
The first projection unit that projects the first image and
Equipped with the first shooting section
The second projector
The second projection unit that projects the second image and
Equipped with a second shooting section
The captured value at the first position on the first captured image obtained by capturing at least a part of the first image projected by the first projection unit by the first imaging unit becomes the first target color. , Obtaining the first correction data for correcting the projected image of the first projector,
The previous SL shooting value of the second position on the second captured image at least a portion taken by the second imaging unit of the first image, by correcting the first correction data,
The corrected shooting value of the second position is set as the second target color, and the second image projected from the second projection unit is the third position on the third shooting image taken by the second shooting unit. The second correction data for correcting the color of the projected image of the second projector is obtained so that the shooting value becomes the second target color.
The first position on the first captured image and the second position on the second captured image correspond to the fourth position on the projection surface on which the first image is projected.
An image projection system characterized by. The claim is characterized in that the first correction data for accepting the setting of the color of the first target and correcting the color of the projected image of the first projector to the received color of the first target is obtained. image projection system according to 1. The first aspect of claim 1 is characterized in that the captured value at the fifth position on the first captured image is set as the first target color, and the first correction data corrected to the first target color is obtained. The image projection system described. A control method for an image projection system including a first projector including a first projection unit and a first imaging unit, and a second projector including a second projection unit and a second imaging unit.
As before Symbol shooting value of the first position on the first photographed image at least a portion of the first image captured by the first imaging portion projected by the first projection portion, the first target color , Obtaining the first correction data for correcting the projected image of the first projector,
The previous SL shooting value of the second position on the second captured image at least a portion taken by the second imaging unit of the first image, by correcting the first correction data,
The corrected shooting value of the second position is set as the second target color, and the second image projected from the second projection unit is shot at the third position on the third shooting image taken by the second shooting unit. The second correction data for correcting the color of the projected image of the second projector is obtained so that the value becomes the color of the second target.
The first position on the first captured image and the second position on the second captured image correspond to a fourth position on the projection surface on which the first image is projected. How to control the image projection system.

Images