JP2013097648A - Image display system, image processing device and method for controlling image processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display system capable of matching colors displayed in a plurality of image display devices, an image processing device and a method for controlling the image processing device.SOLUTION: A server refers to profiles of two image display devices to identify color gamuts Ga, Gb of each of the image display devices on an xy chromaticity diagram, and an area where the identified two color gamuts Ga, Gb overlap is determined as a common color gamut Gw commonly-displayable in both of the image display devices. The server then generates a conversion table for converting a color indicated by image information input from a client system into a color within the common color gamut Gw. When image information is input from the client system to the server, the server refers to the generated conversion table to perform processing for converting colors (color conversion processing). By the color conversion, the image information input into the server is converted into image information indicating a color within the common color gamut Gw and thus color matching is performed.

Description

  The present invention relates to an image display system that displays an image on a plurality of image display devices, an image processing device, and a control method for the image processing device.

  In a system that displays a common image on a plurality of image display devices installed at different locations (bases), such as a video conference system that conducts a conference between remote locations, the type of image display device at each base is different. Since the colors (display colors) of displayed images are different, various techniques for matching the display colors of a plurality of image display apparatuses have been proposed (for example, see Patent Document 1). In Patent Document 1, one of a plurality of image display devices (video output devices) is determined as a master, and color conversion data for matching the display color of the image display device to the master is generated at each site. A technique for adjusting a display color based on conversion data is described. For example, an image display device having the narrowest color reproduction range among the plurality of image display devices is selected as the master.

JP 2010-268065 A

  However, in the technique described in Patent Document 1, in each image display device, when the deviation between the color reproduction range and the master color reproduction range is large, it may occur that colors within the master color reproduction range cannot be reproduced. For this reason, it is difficult to match the display colors. In addition, since it is necessary to provide a color adjustment device for adjusting the display color at each site, there is a problem that the system is likely to be complicated and the cost is increased.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An image display system according to this application example includes a first client to which a first image display device is connected, a second client to which a second image display device is connected, and the first client. And a server connected to the second client and the second client via a network and inputting / outputting image information between the first client and the second client. The server includes a color gamut capable of displaying the color represented by the image information input from the first client or the second client on the first image display device, and the second image display device. Color conversion processing is performed to convert the image information into a common color gamut that intersects with the displayable color gamut, and the processed image information is sent to the first client and the second client. The first client displays an image based on the processed image information on the first image display device, and the second client displays the processed image information on the processed image information. A base image is displayed on the second image display device.

  According to this image display system, the server uses a common color gamut that can be displayed by the first image display device and a color gamut that can be displayed by the second image display device for the input image information. Since color conversion is performed so as to be within the color gamut, the color displayed on the first image display device and the color displayed on the second image display device can be easily matched. Since the server performs color conversion, each client only needs to display an image based on the processed image information input from the server, and the processing on the client side does not have to be heavy.

  Application Example 2 In the image display system according to the application example described above, the server includes a first profile that performs color space conversion with respect to the first image display device, and a color space with respect to the second image display device. Based on the first profile and the second profile, the common color gamut is derived based on the storage unit that stores the second profile to be converted, and the color represented by the image information is changed to a color in the common color gamut. A conversion table generating unit that generates a conversion table to be converted, wherein the processing unit is configured to perform the processing on the image information input from the first client or the second client based on the conversion table. The color conversion process may be performed.

  Application Example 3 In the image display system according to the application example described above, the processing unit performs the first profile or the second processing on the image information input from the first client or the second client. A first color space conversion unit that converts a color space based on the profile of the image, and the color conversion process based on the conversion table for image information that has been converted by the first color space conversion unit. A color conversion unit that performs the color conversion processing, generates image information for the first client by restoring a color space based on the first profile for the image information after the color conversion processing, and the color information A second color space conversion unit that restores the color space based on the second profile to generate image information for the second client with respect to the image information after the conversion processing. Desirable.

  Application Example 4 In the image display system according to the application example, the server detects the type of image information input from the first client or the second client, and performs the color conversion process. It is desirable to further include an image discriminating unit that discriminates the presence or absence.

  Application Example 5 An image processing apparatus according to this application example is connected to a first client to which a first image display apparatus is connected and a second client to which a second image display apparatus is connected via a network. An image processing apparatus that is connected and performs input / output of image information between the first client and the second client, and the image information input from the first client or the second client A color conversion process is performed to convert the color represented by the color gamut so that the color gamut that can be displayed on the first image display device and the color gamut that can be displayed on the second image display device intersect. And a processing unit for outputting the processed image information to the first client and the second client.

  According to this image processing apparatus, within the common color gamut where the color gamut that can be displayed by the first image display device and the color gamut that can be displayed by the second image display device intersect with respect to the input image information. Since the color conversion is performed so as to be within the range, the color displayed on the first image display device and the color displayed on the second image display device can be easily matched. In addition, since the image processing apparatus performs color conversion, each client may display an image based on the processed image information input from the image processing apparatus, and the processing on the client side does not have to be heavy.

  Application Example 6 In the image processing apparatus according to the application example described above, a first profile that performs color space conversion with respect to the first image display apparatus, and a first profile that performs color space conversion with respect to the second image display apparatus. And a conversion table for deriving the common color gamut based on the first profile and the second profile and converting the color represented by the image information into a color in the common color gamut. A conversion table generation unit for generating the image information, and the processing unit performs the color conversion process on the image information input from the first client or the second client based on the conversion table. It is desirable to do.

  Application Example 7 In the image processing apparatus according to the application example described above, the processing unit may receive the first profile or the second profile for image information input from the first client or the second client. A first color space conversion unit that converts a color space based on the profile of the image, and the color conversion process based on the conversion table for image information that has been converted by the first color space conversion unit. A color conversion unit that performs the color conversion processing, generates image information for the first client by restoring a color space based on the first profile for the image information after the color conversion processing, and the color information A second color space conversion unit that restores the color space based on the second profile to generate image information for the second client based on the second profile. Hope Arbitrariness.

  Application Example 8 In the image processing apparatus according to the application example described above, the type of image information input from the first client or the second client is detected to determine whether the color conversion process is performed. It is desirable to further include an image discrimination unit.

  Application Example 9 A method for controlling an image processing apparatus according to this application example includes a network connected to a first client to which a first image display apparatus is connected and a second client to which a second image display apparatus is connected. And a method for controlling an image processing apparatus that inputs and outputs image information between the first client and the second client, from the first client or the second client. The color represented by the input image information is converted so that it falls within a common color gamut where a color gamut that can be displayed on the first image display device and a color gamut that can be displayed on the second image display device intersect. And a process step of outputting the processed image information to the first client and the second client.

  According to the control method of the image processing apparatus, a common color gamut that can be displayed by the first image display device and a color gamut that can be displayed by the second image display device intersect with each other for the input image information. Since color conversion is performed so as to be within the color gamut, the color displayed on the first image display device and the color displayed on the second image display device can be easily matched. In addition, since the image processing apparatus performs color conversion, each client may display an image based on the processed image information input from the image processing apparatus, and the processing on the client side does not have to be heavy.

  Application Example 10 In the control method of the image processing apparatus according to the application example, the first profile that performs color space conversion with respect to the first image display apparatus, and the color space conversion with respect to the second image display apparatus. A conversion table generating step for deriving the common color gamut based on a second profile for performing and converting a color represented by the image information into a color in the common color gamut; and in the processing step, It is preferable that the color conversion process is performed on the image information input from the first client or the second client based on the conversion table.

  Application Example 11 In the control method of the image processing apparatus according to the application example, the processing step may include the first profile or the image information input from the first client or the second client. A first color space conversion step for converting a color space based on the second profile; and image information obtained by converting the color space in the first color space conversion step based on the conversion table. A color conversion step for performing color conversion processing, and generating image information for the first client by restoring the color space based on the first profile for the image information after the color conversion processing. The image information for the second client is generated by restoring the color space based on the second profile for the image information after the color conversion process. A color space conversion step of, it is desirable to have a.

  Application Example 12 In the image processing apparatus control method according to the application example described above, whether or not the color conversion process is performed by detecting the type of image information input from the first client or the second client It is desirable to further include an image discrimination step for discriminating the above.

  Further, when the above-described image processing apparatus and its control method are constructed using a computer, the above form and the application example can read a program for realizing the function or the program can be read by the computer. It is also possible to configure in the form of a recording medium or the like recorded in Recording media include flexible disks, hard disks, optical disks such as CDs and DVDs, magneto-optical disks, memory cards and USB memories equipped with nonvolatile semiconductor memory, and internal storage devices for image processing devices (semiconductor memories such as RAM and ROM). ) And the like can be used.

The block diagram which shows schematic structure of an image display system. The block diagram which shows schematic structure of a server. The block diagram which shows schematic structure of a client system. Explanatory drawing which shows the image displayed on an image display apparatus at the time of execution of the client conference program. The flowchart for demonstrating operation | movement of the server at the time of producing | generating a conversion table. It is an xy chromaticity diagram for explaining generation of a conversion table, (a) is a diagram showing a color gamut that can be displayed on each image display device, and (b) is a common display on both image display devices. The figure which shows the possible common color gamut, (c) is a figure which shows the color gamut of the image information input into a server from a client system, and a common color gamut. The functional block diagram which shows the function of a server process part when image information is input from the client system. The flowchart for demonstrating operation | movement of the server when image information is input from the client system. The block diagram which shows the structure of a client system in the case of producing | generating a profile. The block diagram which shows the structure of the server in the case of producing | generating a profile. The figure which shows a color chart. 6 is a flowchart for explaining profile generation.

Hereinafter, the image display system of the present embodiment will be described with reference to the drawings.
The image display system according to the present embodiment is a system for conducting a conference between remote locations, so that a common image (such as a document) can be displayed on a plurality of image display devices located at remote locations. It has become.

FIG. 1 is a configuration diagram showing a schematic configuration of an image display system.
As shown in FIG. 1, the image display system 100 includes a server 1 and a plurality of client systems 2 connected to each other via a network NW. Each of the plurality of client systems 2 includes an image display device 22 and is disposed at a location (base T) that is separated from each other. In addition, although this embodiment demonstrates the example containing the two client systems 2 each arrange | positioned at the two bases T, the number of the client systems 2 is not restricted to two, Three or more may be sufficient. Further, hereinafter, the two bases T are also referred to as a first base Ta and a second base Tb, and the client systems 2 respectively disposed at the first base Ta and the second base Tb are designated as the first base Ta and the second base Tb. Also referred to as a client system 2a and a second client system 2b, the image display devices 22 included in the first client system 2a and the second client system 2b are referred to as the first image display device 22a and the second image display, respectively. Also referred to as device 22b.

FIG. 2 is a block diagram illustrating a schematic configuration of the server 1.
The server 1 of this embodiment corresponds to an image processing apparatus and is configured by a computer. As shown in FIG. 2, the server 1 includes a server processing unit 11 (also simply referred to as “processing unit 11”), a server storage unit 12 (also simply referred to as “storage unit 12”), and an input / output interface. (I / F) 13.

  The server processing unit 11 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like. The server processing unit 11 reads an OS (Operating System) and application programs stored in the server storage unit 12 and controls the operation of the server 1 by performing various processes according to these programs.

  The server storage unit 12 is, for example, a hard disk drive, and stores an OS, application programs, various data, and the like. The server storage unit 12 of the present embodiment stores a server conference program MS for performing a conference between remote locations through communication via the network NW.

  The input / output interface 13 is connected to the network NW and inputs / outputs data to / from the client system 2.

FIG. 3 is a block diagram illustrating a schematic configuration of the client system 2.
As shown in FIG. 3, the client system 2 includes a control device 21, an image display device 22, an imaging device 23, a microphone 24, a speaker 25, and an input device 26. The client system 2 is connected to the other client systems 2 and the server 1 via the network NW, and the client systems 2 communicate with each other via the server 1 to enable a conference between remote locations. Yes.

  The control device 21 corresponds to a client for the server 1 and is configured by a computer, for example. The control device 21 includes a client processing unit 31 (also simply referred to as “processing unit 31”), a client storage unit 32 (also simply referred to as “storage unit 32”), and an input / output interface (I / F) 33. And have.

  The client processing unit 31 is configured by a CPU, a RAM, and the like. The client processing unit 31 reads the OS and application programs stored in the client storage unit 32, and controls the operation of the client system 2 by performing various processes according to these programs.

  The client storage unit 32 is, for example, a hard disk drive, and stores an OS, application programs, various data, and the like. The client storage unit 32 of the present embodiment stores a client conference program MC and the like for performing a conference between remote locations by communication via the network NW.

  The input / output interface 33 is connected to the image display device 22, the imaging device 23, the microphone 24, the speaker 25, and the input device 26, and inputs / outputs data to / from these devices. The input / output interface 33 is connected to the network NW and inputs / outputs data to / from the server 1.

  The image display device 22 is configured by, for example, a liquid crystal display device or the like, and displays an image based on image information input from the control device 21.

  The imaging device 23 includes an imaging device (not shown) such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor, and captures a conference participant with a moving image. Then, image information of the captured image (captured image) is generated and output to the control device 21.

  The microphone 24 collects sound or the like uttered by the conference participant, generates a sound signal, and outputs the sound signal to the control device 21. The speaker 25 outputs a sound based on the sound signal input from the control device 21 and outputs a sound or the like uttered by a conference participant at another site T.

  The input device 26 is configured by a keyboard, a mouse, and the like, receives a user's input operation, and transmits it to the control device 21.

  FIG. 4 is an explanatory diagram showing an image (display screen) displayed on the image display device 22 when the client conference program MC is executed. When the user instructs activation of the client conference program MC by the input device 26, the client processing unit 31 reads out and executes this program from the client storage unit 32, and displays the display screen Wm shown in FIG. Let

  As shown in FIG. 4, the display screen Wm includes a first participant display area A1, a second participant display area A2, a material display area A3, an operation area A4, and the like.

  The first participant display area A1 is an area for displaying a captured image (conference participant) of any one site T. When a conference is performed between two sites T as in this embodiment, A captured image of the partner site T is displayed. When a meeting is held between three or more sites T, a speaker is specified by the voice collected by the microphone 24, and a captured image of the site T where the speaker is present is displayed. Alternatively, a captured image of the base T designated by the user (conference participant himself or the operator) may be displayed. The second participant display area A2 is an area for displaying a picked-up image of another base T, that is, a picked-up image other than the base T where the picked-up image is displayed in the first participant display area A1. When a meeting is held between T, a captured image of its own base T is displayed. Further, when a meeting is performed between three or more bases T, captured images of the plurality of bases T are displayed in a horizontal row.

  The material display area A3 is an area for displaying an image of material or the like to be referred to during the meeting (hereinafter referred to as “reference image Rp”), and an image designated by a user at any of the bases T is displayed. . The reference image Rp displayed in the material display area A3 is an image that is displayed in common at all bases T, and is displayed in a state where color matching (color matching) is performed between the image display devices 22 at the bases T. Is done. The reference image Rp may be stored as a file in the client storage unit 32, or may be an image captured by various imaging means (such as a video camera or a document camera) (not shown) other than the imaging device 23. Also good.

  The operation area A4 includes a plurality of icons, menus, and the like for the user to perform various operations. By operating the operation area A4, the user can instruct the start or end of the conference or can specify the reference image Rp to be displayed in the material display area A3.

  In the client system 2 at each site T, when the display screen Wm is displayed on the image display device 22, the control device 21 sequentially outputs image information generated by the imaging device 23 at its site T to the server 1. When the user designates the reference image Rp to be displayed in the material display area A3, the control device 21 outputs the image information of the reference image Rp to the server 1, and the image information should be color matched. The server 1 is notified that it is image information. When image information is input from the client system 2 (control device 21) at each site T, the server 1 performs image processing on the image information as necessary, and the processed image information is sent to both client systems 2. To supply. The image information input / output between the control device 21 and the server 1 is image information expressed in the RGB color space.

  The control device 21 of the client system 2 displays the captured image on the first participant display area A1 and the second participant display area A2 of the display screen Wm based on the image information supplied from the server 1, The reference image Rp is displayed in the material display area A3. As described above, the captured image or the reference image Rp displayed in the display screen Wm is the captured image captured by the imaging device 23 at its own base T or the reference image Rp specified at its own base T. The display is performed based on the image information supplied from the server 1.

Next, the operation of the server 1 will be described.
Returning to FIG. 2, in the server storage unit 12, the profiles Pa and Pb of the image display device 22 at each site T, that is, the profile Pa of the first image display device 22a (hereinafter also referred to as “first profile Pa”). And the profile Pb of the second image display device 22b (hereinafter also referred to as “second profile Pb”) are stored. A profile is a data group used to match the display of colors between different devices, and a device-dependent color space (for example, RGB color space) and a device-independent color space (for example, XYZ color space). And a conversion table that can be converted to each other. As a profile format, an ICC profile whose specifications are published by ICC (International Color Consortium) is generally known, and an ICC profile of a monitor device such as the image display device 22 is also called a monitor profile. These profiles may be generated by the manufacturer of the image display device 22 and provided to the user, or the user may independently generate the profile using a colorimeter or the like. The server 1 acquires the first profile Pa and the second profile Pb via the network NW, an external storage medium, and the like, and stores them in the server storage unit 12. And the server 1 produces | generates the conversion table Tw for performing color matching between the image display apparatuses 22 of each base T based on these profile Pa and Pb.

  FIG. 5 is a flowchart for explaining the operation of the server 1 when generating the conversion table Tw. FIG. 6 is an xy chromaticity diagram for explaining the generation of the conversion table Tw. FIG. 6A is a diagram showing a color gamut that can be displayed on each image display device 22, and FIG. FIG. 8C is a diagram showing a common color gamut that can be displayed in common on the image display device 22, and FIG. 8C is a diagram showing a color gamut of image information input from the client system 2 to the server 1 and a common color gamut.

  First, when the server processing unit 11 acquires the profiles Pa and Pb, as shown in FIG. 6A, the color gamut of each image display device 22 on the xy chromaticity diagram based on these profiles Pa and Pb. Ga and Gb are specified (step S101). Specifically, the color gamut Ga that can be displayed on the first image display device 22a is specified based on the first profile Pa, and is displayed on the second image display device 22b based on the second profile Pb. A possible color gamut Gb is specified. As shown in the figure, the specified color gamuts Ga and Gb are in different ranges according to differences in the model of the image display device 22, individual differences, changes with time, and the like. Then, as shown in FIG. 6B, the server processing unit 11 can display a common color gamut in which all (both) image display devices 22 can commonly display a region where the two specified color gamuts Ga and Gb intersect. It is determined as Gw (step S102).

  Next, the server processing unit 11 generates a conversion table Tw (see FIG. 2) for converting the color represented by the image information input from the client system 2 to the server 1 into a color in the common color gamut Gw (see FIG. 2). Step S103). Note that image information corresponding to sRGB is input to the server 1 of the present embodiment.

  As shown in FIG. 6C, when the sRGB color gamut Gs is at least partially outside the common color gamut Gw, the server processing unit 11 shares the color outside the common color gamut Gw. A conversion table Tw that can be converted into colors in the color gamut Gw is generated. For example, all the colors outside the common color gamut Gw may be converted into colors on the boundary of the common color gamut Gw, or colors on the boundary of the sRGB color gamut Gs may be converted on the boundary of the common color gamut Gw. While converting to a color, the color inside the boundary of the color gamut Gs may be converted to a color in the common color gamut Gw while appropriately interpolating. It should be noted that the color gamut may be expanded to the common color gamut Gw in the portion where the common color gamut Gw is outside the sRGB color gamut Gs, or color conversion may not be performed. The server processing unit 11 stores the generated conversion table Tw in the server storage unit 12.

  Next, the operation of the server 1 when image information is input from the client system 2 will be described.

  FIG. 7 is a functional block diagram showing functions of the server processing unit 11 when image information is input from the client system 2, and each function is realized by the server conference program MS. FIG. 8 is a flowchart for explaining the operation of the server 1 when image information is input from the client system 2.

  As shown in FIG. 7, the server processing unit 11 includes an image determination unit 15, a color space conversion unit 16, a color conversion unit 17, a color space conversion unit 18, and an image information output unit 19. Image information expressed in RGB from each client system 2 is input to the input / output interface 13 of the server 1, and this image information is input to the image determination unit 15.

  Based on the notification from the client system 2, the image determination unit 15 determines whether the input image information is image information that requires color matching, that is, whether the image information represents the reference image Rp. It discriminate | determines (step S201). The image information representing the reference image Rp is output to the color space conversion unit 16, and the other image information is output to the image information output unit 19. In this embodiment, whether or not the image information requires color matching is determined based on the notification from the client system 2. However, the present invention is not limited to this mode. The type of information may be detected and determined according to the type. As the type of image information, for example, a still image or a moving image may be detected, or a file format of image information may be detected.

  The color space conversion unit 16 performs color space conversion on the image information input from the image determination unit 15 based on the profiles Pa and Pb stored in the server storage unit 12 (step S202). Specifically, when the image information is input from the first client system 2a, the color space conversion unit 16 converts the RGB color space image information into the XYZ color space image based on the first profile Pa. Convert to information. When image information is input from the second client system 2b, the color space conversion unit 16 converts the image information in the RGB color space into image information in the XYZ color space based on the second profile Pb. To do. The color space conversion unit 16 outputs the converted image information to the color conversion unit 17.

  Based on the conversion table Tw stored in the server storage unit 12, the color conversion unit 17 performs color conversion processing (color conversion processing) on image information in the XYZ color space input from the color space conversion unit 16. (Step S203). By this color conversion, the image information input to the server 1 is converted into image information represented by colors in the common color gamut Gw, and color matching is performed. The color conversion unit 17 outputs the converted image information to the color space conversion unit 18.

  Based on the profiles Pa and Pb stored in the server storage unit 12, the color space conversion unit 18 performs color space conversion on the image information after color conversion input from the color conversion unit 17, and the client Image information is generated for each system 2 (step S204). Specifically, the color space conversion unit 18 converts the image information in the XYZ color space into image information in the RGB color space based on the first profile Pa, so that the image information for the first client system 2a is obtained. Is generated. Further, the color space conversion unit 18 generates image information for the second client system 2b by converting image information in the XYZ color space into image information in the RGB color space based on the second profile Pb. . The color space conversion unit 18 outputs the converted image information to the image information output unit 19.

  The image information output unit 19 outputs the image information generated by the color space conversion unit 18 for each client system 2 to the corresponding client system 2 via the input / output interface 13 and the network NW (step S205). Specifically, the image information for the first client system 2a is output to the first client system 2a, and the image information for the second client system 2b is output to the second client system 2b. On the other hand, when image information is input from the image determination unit 15 to the image information output unit 19, the image information output unit 19 outputs this image information to all (both) client systems 2 (step S206).

  Each client system 2 displays an image based on the image information input from the server 1 on the image display device 22. Specifically, the control device 21 of the first client system 2a displays a captured image obtained by capturing a conference participant among images based on the image information input from the server 1, as a first participant display on the display screen Wm. The reference image Rp based on the image information for the first client system 2a is displayed in the material display area A3 while being displayed in the area A1 and the second participant display area A2. Similarly, the control device 21 of the second client system 2b uses the first participant display area A1 of the display screen Wm to display the captured image obtained by capturing the conference participant among the images based on the image information input from the server 1. And the reference image Rp based on the image information for the second client system 2b is displayed in the material display area A3. The reference image Rp displayed in the material display area A3 is converted to a color in the common color gamut Gw, and is displayed in the same color on all (both) image display devices 22. If the common color gamut Gw is smaller than the sRGB color gamut Gs, the original color may not be reproduced, but even in this case, the displayed color is the same for all image display devices. 22 is the same.

Next, generation of the profiles Pa and Pb of the image display device 22 will be described.
When the profiles Pa and Pb of the image display device 22 are provided from the manufacturer, it is not necessary for the user to generate the profiles Pa and Pb, and the colors between the image display devices 22 are provided using the provided profiles Pa and Pb. Matching may be performed. However, when the profiles Pa and Pb are not provided by the manufacturer or when more accurate color matching is desired, the user may generate the profiles Pa and Pb himself. In general, in order to generate a monitor device profile (monitor profile), a measuring device such as a colorimeter is required. In this embodiment, instead of the colorimeter, an imaging device with a known profile (digital) is used. The profiles Pa and Pb of the image display device 22 are generated by using a camera or the like. The ICC profile of an apparatus that inputs an image such as an imaging apparatus is also called an input profile.

  FIG. 9 is a block diagram showing a configuration of the client system 2 when generating the profiles Pa and Pb, and FIG. 10 is a block diagram showing a configuration of the server 1 when generating the profiles Pa and Pb. FIG. 11 shows a color chart.

  As shown in FIG. 9, the client system 2 includes a digital camera 27 as an imaging device for generating profiles Pa and Pb, in addition to the imaging device 23 that images the conference participants. The digital camera 27 includes an image sensor (not shown) such as a CCD sensor or a CMOS sensor, captures a subject as a still image, and displays image information (captured image information) representing the captured image in an RGB color space. Is generated. The digital camera 27 included in the first client system 2a is also referred to as a first digital camera 27a, and the digital camera 27 included in the second client system 2b is also referred to as a second digital camera 27b.

  As shown in FIG. 10, the server storage unit 12 stores color chart image information Vc representing the color chart CC (see FIG. 11). The color chart CC is an image including a plurality of color samples, and the color chart image information Vc is image information representing the color chart CC in an RGB color space. As shown in FIG. 11, in the present embodiment, the color chart CC includes 24 color samples having different color types and brightness, and the server 1 uses the color chart CC as an image of each site T. The image is displayed on the display device 22 and captured by the digital camera 27, and the profiles Pa and Pb are generated based on the imaging result. Note that a plurality of color charts CC in which the arrangement of each color sample is changed may be taken in consideration of color unevenness of the image display device 22, that is, a change in color depending on the display position.

  Further, in the server storage unit 12, the input profiles Pia and Pib of each digital camera 27, that is, the input profile Pia of the first digital camera 27a (hereinafter also referred to as “first input profile Pia”) and the second. The input profile Pib of the digital camera 27b (hereinafter also referred to as “second input profile Pib”) is stored. These input profiles Pia and Pib may be generated by the manufacturer of the digital camera 27 and provided to the user, or the user may generate the input profile Pia and Pib independently. The server 1 acquires the input profiles Pia and Pib of the digital camera 27 at each site T via the network NW, an external storage medium, and the like, and stores them in the server storage unit 12.

FIG. 12 is a flowchart for explaining generation of profiles Pa and Pb.
As shown in FIG. 12, first, when the generation of the profiles Pa and Pb is instructed, the server 1 outputs the color chart image information Vc to each client system 2 (step S301).

  The control device 21 of each client system 2 displays the color chart CC on the image display device 22 based on the input color chart image information Vc (step S302). Each client system 2 captures the color chart CC displayed on the image display device 22 with the digital camera 27 (step S303), and outputs captured image information generated by the digital camera 27 from the control device 21 to the server 1. (Step S304). That is, captured image information generated by capturing the color chart CC is input to the server 1. When there are a plurality of color charts CC, the plurality of color charts CC are sequentially imaged and a plurality of captured image information is output to the server 1. Here, when outputting the captured image information generated by the digital camera 27 to the server 1, the digital camera 27 may be connected to the control device 21 by wire or wirelessly, or the captured image information is recorded. A storage medium such as a memory card may be detached from the digital camera 27 and connected to the control device 21. Further, when the input profiles Pia and Pib described above are transmitted from each client system 2 to the server 1, the input profiles Pia and Pib may be transmitted together with the captured image information. It can also be included.

  When the captured image information is input from the client system 2 at each site T, the server 1 obtains color data of each color sample (a numerical value representing the brightness of each RGB) on the RGB color space based on the captured image information. Derived for each client system 2, that is, for each image display device 22 (step S305). For example, the color data at the center position of each color sample may be extracted, or the color data at a plurality of positions may be extracted for each color sample and the average value thereof may be used. Further, when there are a plurality of color samples of the same color as in the case of using a plurality of color charts CC in which the arrangement of each color sample is changed, the respective color data may be further averaged.

  Thereafter, the server 1 performs color space conversion on the derived color data of each color sample based on the input profiles Pia and Pib stored in the server storage unit 12 (step S306). Specifically, when the captured image information is input from the first client system 2a, the server 1 converts the color data in the RGB color space into the physical data in the XYZ color space based on the first input profile Pia. Convert to (Numerical values of XYZ). When the captured image information is input from the second client system 2b, the server 1 converts the color data in the RGB color space into physical data in the XYZ color space based on the second input profile Pib. . As described above, the server 1 derives physical data of each color sample for each client system 2 at each site T, that is, for each image display device 22.

  Next, the server 1, based on the derived physical data of each color sample and the color chart image information Vc stored in the server storage unit 12, the RGB color space in the image display device 22 at each site T, and XYZ Derives correlation with color space. Based on this correlation, profiles Pa and Pb are generated (step S307) and stored in the server storage unit 12.

  When the profiles Pa and Pb are generated as described above, the server 1 performs the color matching as described above. That is, the common color gamut Gw is derived based on the generated profiles Pa and Pb, and the conversion table Tw for converting the color represented by the input image information into the color in the common color gamut Gw is generated. Then, the image information input from the client system 2 is subjected to color conversion processing using the conversion table Tw and the like, and the processed image information is transmitted to the client system 2. As a result, the reference image Rp in the display screen Wm is displayed in the same color on all the image display devices 22.

  As described above, according to the image display system 100 of the present embodiment, the following effects can be obtained.

  (1) According to the image display system 100 of the present embodiment, the server 1 uses the profile Pa (first profile Pa) of the first image display device 22a and the profile Pb (first profile) of the second image display device 22b. 2, a color gamut Ga that can be displayed by the first image display device 22a and a color gamut Gb that can be displayed by the second image display device 22b. A conversion table Tw is generated for conversion so as to be within the common color gamut Gw that intersects. The server 1 performs color conversion processing based on the generated conversion table Tw on the image information input from the client system 2, so that the color displayed on the first image display device 22 a and the second The colors displayed on the image display device 22b can be matched. In addition, since the server 1 performs the color conversion process, each client system 2 may display an image based on the processed image information input from the server 1, and the processing on the client system 2 side does not become heavy. It will end.

  (2) According to the image display system 100 of the present embodiment, the server 1 outputs the color chart image information Vc to each client system 2 and outputs it to the first image display device 22a and the second image display device 22b. The color chart CC is displayed. Then, the server 1 generates the profiles Pa and Pb of each image display device 22 based on the captured image information generated by capturing the displayed color chart CC with the digital camera 27. For this reason, even when the image display device 22 whose profile is unknown is used, the colors displayed on the image display devices 22 can be matched.

  In this embodiment, steps S101 to S103 correspond to a conversion table generation step, and the server processing unit 11 when executing steps S101 to S103 to generate the conversion table Tw corresponds to a conversion table generation unit. Steps S202 to S205 correspond to processing steps. Of these, step S202 corresponds to a first color space conversion step, step S203 corresponds to a color conversion step, and step S204 corresponds to a second color space conversion step. Step S301 corresponds to a color chart output step, and the server processing unit 11 and the input / output interface 13 when executing step S301 to display the color chart CC on the image display device 22 correspond to a color chart output unit. . Step S304 corresponds to a captured image output step, and the server processing unit 11 and the input / output interface 13 when the captured image information is input from each client system 2 correspond to the captured image input unit. Steps S305 to S307 correspond to a monitor profile generation step, and the server processing unit 11 when executing steps S305 to S307 to generate the profiles Pa and Pb corresponds to the monitor profile generation unit.

(Modification)
Moreover, you may change the said embodiment as follows.

  In the above embodiment, the image display device 22 is not limited to a liquid crystal display device. For example, it is possible to use a projector that modulates light emitted from a light source according to image information and projects the light onto a projection surface such as a screen. Moreover, a plasma display, an organic EL (Electro Luminescence) display, etc. may be used.

  In the above embodiment, a notebook personal computer that is integrally provided with the image display device 22 or the like may be used as the control device 21 of the client system 2.

  In the above embodiment, as the network NW, a public network such as the Internet may be used, or a LAN (Local Area Network) or a dedicated line may be used.

  In the above embodiment, the control device 21 of the client system 2 displays the display screen Wm on the image display device 22 by executing the client conference program MC. However, the present invention is not limited to this mode. For example, the control device 21 may be supplied with the display screen Wm from the server 1 by a general-purpose browsing program (browser).

In the above embodiment, image information expressed in the RGB color space is input / output between the server 1 and the client system 2, but other color spaces (for example, YCbCr color space, YPbPr color space, etc.) are used. ) May be used. In the above-described embodiment, the XYZ color space is used as the device-independent color space. However, other color spaces (for example, L ^* a ^* b ^* color space) may be used.

  In the above embodiment, the server 1 derives the color data of each color sample of the color chart CC based on the captured image information input from the client system 2 when generating the profiles Pa and Pb of each image display device 22. Although this color data is converted into physical data in the XYZ color space, the present invention is not limited to this mode. For example, instead of deriving the color data of each color sample, the color space of the input captured image information may be converted to the XYZ color space, and the physical data of each color sample may be derived from the converted captured image information.

  In the above embodiment, all of the color samples to be imaged (24 colors in the above embodiment) are included in one color chart CC, but are imaged a plurality of times by being dispersed in a plurality of color charts CC. You may do it.

  DESCRIPTION OF SYMBOLS 1 ... Server, 2 ... Client system, 2a ... 1st client system, 2b ... 2nd client system, 11 ... Server processing part, 12 ... Server memory | storage part, 13 ... Input-output interface, 15 ... Image discrimination | determination part, 16 ... Color space conversion unit, 17 ... Color conversion unit, 18 ... Color space conversion unit, 19 ... Image information output unit, 21 ... Control device, 22 ... Image display device, 22a ... First image display device, 22b ... Second Image display device, 23 ... imaging device, 24 ... microphone, 25 ... speaker, 26 ... input device, 27 ... digital camera, 27a ... first digital camera, 27b ... second digital camera, 31 ... client processing unit, 32 ... Client storage unit 33 ... Input / output interface 100 ... Image display system NW ... Network T ... Base, Ta ... First Point, Tb ... second base, Wm ... display screen, A1 ... first participant display area, A2 ... second participant display area, A3 ... material display area, A4 ... operation area, Rp ... reference image, CC ... color chart, Vc ... color chart image information, Ga, Gb, Gs ... color gamut, Gw ... common color gamut, Tw ... conversion table, MS ... server conference program, MC ... client conference program, Pa ... first Pb ... second profile, Pia ... first input profile, Pib ... second input profile.

Claims (12)

A first client to which a first image display device is connected;
A second client to which a second image display device is connected;
A server connected to the first client and the second client via a network and inputting / outputting image information between the first client and the second client;
An image display system comprising:
The server
The color represented by the image information input from the first client or the second client, the color gamut that can be displayed on the first image display device, and the color that can be displayed on the second image display device A processing unit that performs color conversion processing for conversion so as to fit within a common color gamut that intersects the gamut, and outputs processed image information to the first client and the second client;
The first client causes the first image display device to display an image based on the processed image information,
The image display system, wherein the second client displays an image based on the processed image information on the second image display device. The image display system according to claim 1,
The server
A storage unit that stores a first profile that performs color space conversion on the first image display device, and a second profile that performs color space conversion on the second image display device;
A conversion table generation unit that derives the common color gamut based on the first profile and the second profile, and generates a conversion table that converts the color represented by the image information into a color in the common color gamut;
Further comprising
The image processing system, wherein the processing unit performs the color conversion process on the image information input from the first client or the second client based on the conversion table. The image display system according to claim 2,
The processor is
A first color space conversion unit that converts a color space based on the first profile or the second profile for image information input from the first client or the second client;
A color conversion unit that performs the color conversion processing based on the conversion table for the image information in which the color space is converted by the first color space conversion unit;
With respect to the image information after the color conversion process, the color space is restored based on the first profile to generate image information for the first client, and the image information after the color conversion process is converted into the image information after the color conversion process. On the other hand, a second color space conversion unit that restores the color space based on the second profile and generates image information for the second client;
An image display system comprising: The image display system according to any one of claims 1 to 3,
The server further includes an image determination unit that detects a type of image information input from the first client or the second client and determines whether or not the color conversion process is performed. Image display system. A first client connected to the first image display device, and a second client connected to the second image display device via a network, the first client and the second client; An image processing apparatus for inputting and outputting image information between
The color represented by the image information input from the first client or the second client, the color gamut that can be displayed on the first image display device, and the color that can be displayed on the second image display device An image having a processing unit that performs color conversion processing for conversion so as to be within a common color gamut that intersects with the gamut and outputs the processed image information to the first client and the second client Processing equipment. The image processing apparatus according to claim 5,
A storage unit that stores a first profile that performs color space conversion on the first image display device, and a second profile that performs color space conversion on the second image display device;
A conversion table generation unit that derives the common color gamut based on the first profile and the second profile, and generates a conversion table that converts the color represented by the image information into a color in the common color gamut;
Further comprising
The image processing apparatus, wherein the processing unit performs the color conversion process on the image information input from the first client or the second client based on the conversion table. The image processing apparatus according to claim 6,
The processor is
A first color space conversion unit that converts a color space based on the first profile or the second profile for image information input from the first client or the second client;
A color conversion unit that performs the color conversion processing based on the conversion table for the image information in which the color space is converted by the first color space conversion unit;
With respect to the image information after the color conversion process, the color space is restored based on the first profile to generate image information for the first client, and the image information after the color conversion process is converted into the image information after the color conversion process. On the other hand, a second color space conversion unit that restores the color space based on the second profile and generates image information for the second client;
An image processing apparatus comprising: An image processing apparatus according to any one of claims 5 to 7,
An image processing apparatus, further comprising an image determination unit that detects a type of image information input from the first client or the second client and determines whether or not the color conversion process is performed. . A first client connected to the first image display device, and a second client connected to the second image display device via a network, the first client and the second client; A method for controlling an image processing apparatus that inputs and outputs image information between
The color represented by the image information input from the first client or the second client, the color gamut that can be displayed on the first image display device, and the color that can be displayed on the second image display device An image having a processing step of performing color conversion processing for conversion so as to fall within a common color gamut intersecting with the gamut and outputting the processed image information to the first client and the second client A method for controlling a processing apparatus. A method for controlling an image processing apparatus according to claim 9, comprising:
Deriving the common color gamut based on a first profile for color space conversion for the first image display device and a second profile for color space conversion for the second image display device, A conversion table generating step for generating a conversion table for converting a color represented by image information into a color in the common color gamut;
In the processing step, the color conversion processing is performed on the image information input from the first client or the second client based on the conversion table. . A method for controlling an image processing apparatus according to claim 10, comprising:
The processing step includes
A first color space conversion step for converting a color space based on the first profile or the second profile for image information input from the first client or the second client;
A color conversion step of performing the color conversion processing based on the conversion table for the image information whose color space has been converted in the first color space conversion step;
With respect to the image information after the color conversion process, the color space is restored based on the first profile to generate image information for the first client, and the image information after the color conversion process is converted into the image information after the color conversion process. On the other hand, a second color space conversion step of generating image information for the second client by returning the color space based on the second profile;
An image processing apparatus control method comprising: It is a control method of the image processing device according to any one of claims 9 to 11,
An image processing apparatus further comprising an image determination step of detecting a type of image information input from the first client or the second client and determining whether or not the color conversion process is performed. Control method.