JP2007081581A - Color processing method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color processing method and a color processing device capable of precisely and easily matching the appearance of the colors between a target display and output equipment used together. <P>SOLUTION: The display color of a color chip and a background color chip displayed on the target display are adjusted. The display color of the color chip and background color chip after adjustment and the output color of the color chip and background color chip before adjustment outputted by output equipment to be calibrated are measured. Based on each measurement value, a correction parameter for prescribing color correction characteristics between the target display and the output equipment to be calibrated is set. Based on the set correction parameter, color reproduction information for correcting the display color of an image to be processed is generated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a color processing method and apparatus for generating color reproduction information for correcting a display color of a target display device by an image processing device.

  In recent years, for the purpose of presentations and the like, there are increasing opportunities to display RGB color image data edited on a monitor of a PC (personal computer) using a liquid crystal projector. When using these projectors, for example, the color of the output image between the connected PC and the projector may be different. Similarly, the color of the RGB color image data generated on the PC output from the printer may be different from the color output from the projector. Furthermore, the color of an output image on a monitor, television, or projector used together may differ from the color of an output image in proof printing by a printer via the projector.

  This is because the color appearance of the output image of the projector is greatly affected by the illumination environment to be observed. For example, environmental differences in illumination illuminance and color temperature differ by several tens to several hundreds of times from a bright office environment such as a presentation in a conference room to a completely dark theater environment. The human visual adaptation changes depending on the environment in which the projector is placed. Therefore, due to this change in state, the color appearance of the output image may differ depending on the environment where the same project is placed.

  In order to avoid such a problem, it is necessary to predict the appearance of the color of the output image of the projector under each illumination environment and perform appropriate correction. As a technique for predicting the color appearance of an output image under such an illumination environment, there is a color appearance technique represented by CIECAM02. Some display devices such as projectors have a function of correcting the lighting environment using this color appearance technology, and some can solve the problem by providing the user with a plurality of profiles corresponding to a plurality of lighting environments. is there.

  When correcting the illumination environment using this color appearance technology, the user sets parameters in the projector through a user interface (UI) or the like. Specifically, parameters including numerical values such as illuminance and color temperature of the illumination environment using the projector are input, and correction parameters for the illumination environment are determined inside the projector.

For example, as disclosed in Japanese Patent Application Laid-Open No. H10-228867, there is a technique that easily obtains information on an illumination environment using a UI and performs correction for canceling the difference in the illumination environment.
Japanese Patent Laid-Open No. 11-041478

  However, the method disclosed in Patent Document 1 is very excellent from the viewpoint of easily determining a correction coefficient and usability. However, for example, there is little information other than the illumination environment for performing correction, such as information relating to the adaptation of the observer, so that color prediction with high accuracy cannot be performed.

  Therefore, despite the correction, there may be a case where the desired color reproduction cannot be obtained after correction, for example, the color of the output image of the PC liquid crystal screen or printer, or the output image of the combined display device is different. This is due to a lack of information for performing highly accurate correction simply by incorporating information around the lighting environment into the correction parameter.

  The present invention has been made to solve the above problems. An object of the present invention is to provide a color processing method and apparatus capable of easily and accurately matching the color appearance between the target display device and the combined output device.

In order to achieve the above object, a color processing method according to the present invention comprises the following arrangement. That is,
A color processing method for generating color reproduction information for correcting a display color of a target display device by an image processing device,
A display process for displaying the color chart and the background color chart on the target display device;
An adjustment step of adjusting the display color of the color chart and the background color chart displayed on the target display device;
The color chart after adjustment by the adjustment step and the display color of the background color chart, the measurement step of measuring the output color of the color chart before adjustment and the background color chart output by the calibration target output device,
A setting step for setting a correction parameter for defining a color correction characteristic between the target display device and the calibration target output device based on a measurement value obtained by the measurement step;
A generation step of generating color reproduction information for correcting the display color of the processing target image based on the correction parameter set in the setting step.

  Preferably, the display step displays a main color chart and a sub-color chart of surrounding colors and a background color chart as color charts.

  Preferably, in the setting step, an environment parameter indicating an observation environment of the target display device is determined based on a measurement value obtained in the measurement step, and a correction parameter including the determined environment parameter is set.

Preferably, the display step displays a correction screen including at least a color chart and a background color chart on the target display device,
In the adjustment step, the display color of the color chart and the background color chart on the correction screen is adjusted using an input device.

Preferably, the display step displays a correction screen including a color chart and a background color chart and an operation control for adjusting the display color on the target display device,
The adjustment step adjusts the display colors of the color chart and the background color chart on the correction screen based on an operation on the correction screen.

  Preferably, in the display step, any one of a single color image, a gradation image, and a natural image is displayed as the color chart and the background color chart, respectively.

  Preferably, the display step displays at least one of a single color image, a gradation image, and a natural image in addition to the color chart and the background color chart.

  Preferably, the adjustment step adjusts the display colors of the color chart and the background color chart displayed on the target display device by selecting and reading a file including adjustment values stored in a storage medium. .

In order to achieve the above object, a color processing apparatus according to the present invention comprises the following arrangement. That is,
A color processing device that generates color reproduction information for correcting a display color of a target display device,
Display means for displaying the color chart and the background color chart on the target display device;
Adjusting means for adjusting the display color of the color chart and the background color chart displayed on the target display device;
The color chart after adjustment by the adjustment means and the display color of the background color chart, the measurement means for measuring the color chart before adjustment and the output color of the background color chart output by the calibration target output device,
Setting means for setting a correction parameter for defining a color correction characteristic between the target display device and the calibration target output device based on a measurement value by the measurement means;
Generating means for generating color reproduction information for correcting the display color of the processing target image based on the correction parameter set by the setting means.

  According to the present invention, it is possible to provide a color processing method and apparatus capable of easily and accurately matching the color appearance between the target display device and the combined output device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Embodiment 1>
FIG. 1 is a block diagram showing a hardware configuration of the image processing apparatus according to the first embodiment of the present invention.

  In FIG. 1, reference numeral 101 denotes a CPU which controls various components constituting the image processing apparatus. Reference numeral 102 denotes a main memory, which includes a RAM, a ROM, and the like. The RAM functions as a data work area and a temporary save area. The ROM stores various control programs including programs that implement each embodiment of the present invention.

  Reference numeral 103 denotes a SCSI interface (I / F), which controls connection with a SCSI device (for example, the HDD 105) and data transfer thereto. A network interface (I / F) 104 controls connection with an external network (local area network 113) and data transmission / reception via the network. An HDD (Hard Disk Drive) 105 stores various data such as the various control programs (OS and various applications) and setting data.

  In the first embodiment, the HDD is described by taking a SCSI format HDD as an example. However, the present invention is not limited to this, and an HDD of another format such as an IDE format or a SATA format may be used. In that case, needless to say, an interface corresponding to each format is configured.

  A graphic accelerator 106 controls the display of images (for example, various user interfaces generated by the control of the CPU 101) output to the projector 107 and the monitor 115. The projector 107 is composed of, for example, a liquid crystal projector (a display device having a light source (lamp)). Further, the monitor 115 is composed of, for example, a CRT or a liquid crystal.

  Reference numeral 108 denotes an RS-232C unit, which executes connection with the photometer 109 and control thereof. Reference numeral 109 denotes a photometer, which measures the luminance of the image to be processed. Reference numeral 110 denotes a keyboard / mouse controller which executes connection with an input device (keyboard 111 and mouse 112) and controls them. Reference numeral 111 denotes a keyboard, and 112 denotes a mouse. Reference numeral 113 denotes a local area network (LAN). Reference numeral 114 denotes a system bus, which includes, for example, a PCI bus, an ISA bus, and the like, and connects various components constituting the image processing apparatus to each other.

  Next, the projection operation of the projector 107 in the image processing apparatus of FIG. 1 will be described.

  First, an image correction application stored in the HDD 105 is activated by the OS program and loaded on the main memory 102 in accordance with a user operation and an instruction from the CPU 101. Then, the image correction application is activated. As a result, the RGB color data expressed in one or more unsigned 8-bit data stored in the HDD 105 is transferred to the main memory 102 via the SCSI I / F 103 and the system bus 114 based on an instruction from the CPU 101. Is done.

  Alternatively, one or a plurality of RGB color data stored in a server connected to the LAN 113 is transferred to the main memory 102 via the network I / F 104 and the system bus 114 according to an instruction from the CPU 101. Alternatively, one or a plurality of RGB color data stored in an external device on the Internet is transferred to the main memory 102 via the network I / F 104 and the system bus 114 according to an instruction from the CPU 101.

  One or a plurality of RGB color data held in the main memory 102 is transferred to the graphic accelerator 106 via the system bus 114 in accordance with an instruction from the CPU 101. The graphic accelerator 106 performs D / A conversion on the received digital image data (one or a plurality of RGB color data) and then transmits it to the projector 107 through a display cable.

  As a result, a user interface (dialog window) described later is displayed on the projector 107. At this time, the same user interface (dialog window) is also displayed on the monitor 115 through the display cable of the projector 107.

  Here, the user makes a predetermined setting on the user interface displayed on the projector 107, or displays a corresponding color patch image (measurement image) from predetermined data. At this time, the setting change on the user interface is reflected only on the user interface displayed on the projector 107, and the display change of the user interface displayed on the monitor 115 is not performed.

  When the color patch image on the projector 107 and the color patch image on the monitor 115 are measured by the photometer 109, the measurement results (measured values for the respective tristimulus values of the display color) are passed through the RC-232C unit 108. ) Is transferred to the HDD 105. At the same time, the fact that the color patch image has been measured is transmitted to the CPU 101.

  Subsequently, according to the processing in the image correction application, one or a plurality of RGB color data held in the main memory 102 is corrected, and the correction result is transferred to the projector 107 and projected.

  Next, image correction processing in the image correction application will be described with reference to FIG.

  FIG. 2 is a flowchart showing image correction processing executed by the image correction application according to the first embodiment of the present invention.

  The image correction application in the first embodiment executes the following three image processing processes. That is, a parameter input process for performing color correction in each illumination environment held in the main memory 102, a correction coefficient calculation process for calculating a correction coefficient from the input parameter, and a color correction process for performing color correction according to the correction coefficient Image correction is performed through these three processes.

  First, in step S201, initialization operations such as securing various memory areas necessary for application operations are performed.

  In step S202, an image correction dialog window (FIG. 3) is displayed from the image correction application. The same dialog window is displayed on the monitor 115. In this dialog window, correction color charts and background color charts and various controls for correcting the color signal values (tristimulus values) are displayed.

  In step S203, the adjustment values of the setting items for the correction color chart and the background color chart are input via the dialog window by an operation via the dialog window.

  In step S204, only the display contents (color chart and background color chart) of the dialog window on the projector 107 are updated and displayed according to the input color chart and background color chart adjustment values.

  In step S205, when the color chart measurement button 312 is operated, the color chart and the background color chart on the dialog windows of the projector 107 and the monitor 115 are measured by the photometer 109 (for example, a spectral radiance measuring instrument). XYZ data is acquired as a measurement value. Thereafter, the measured value is transferred to the HDD 105.

  In step S206, the measured color chart measurement value and background color chart measurement value of the projector 107, the measured color chart measurement value and background color chart measurement value of the monitor 115, and the illumination environment value set in advance by the method described later. Various correction parameters which are color correction characteristics are set. This correction parameter is a parameter for matching the color appearance of the projector 107 and the monitor 115 regardless of the illumination environment.

  In step S207, a correction LUT (lookup table) for performing image correction is created based on the set correction parameters and conversion described later.

  In step S208, after completion processing such as main memory release, the image correction application is terminated.

  Next, the correction parameter input operation of the image correction application will be described.

  First, an image correction application stored in the HDD 105 is activated by the OS program in accordance with a user operation and an instruction from the CPU 101. When the image correction application is activated, an image correction user interface (dialog window) shown in FIG. 3 is displayed on the projector 107.

  Although this user interface will be described in detail later, the user can confirm and specify the illuminance and color temperature of the lighting environment using this user interface. Furthermore, it is possible to specify a projector color chart and a background color chart that have been adjusted to a predetermined color. Here, when the user who has determined that there is no problem with each setting item presses the image correction button, the image correction is executed, and the correction result is stored in the HDD 105.

  Details of the user interface for image correction will be described below with reference to FIG.

  FIG. 3 is a diagram showing a user interface for image correction according to the first embodiment of the present invention.

  Note that operations on the user interface are performed using an input device such as the keyboard 111 and the mouse 112. The user can execute desired image correction by operating various controls prepared on the user interface using these input devices.

  In the user interface 300, reference numeral 301 denotes a window for displaying an adjustment color chart, and displays a color according to a user's initial setting. A window 302 displays a background color chart of the adjustment color chart, and displays a color according to the user's initial setting. A text box 303 sets the color temperature of the lighting environment. A text box 304 sets the illuminance of the lighting environment.

  A slider bar 305 controls the red-green component (chromaticity adjustment) of the color chart displayed in the window 301 by controlling the slider bar 305. A slider bar 306 controls the blue-yellow component (chromaticity adjustment) of the color chart displayed in the window 301 by controlling the slider bar 306. Reference numeral 307 denotes a slider bar, and the slider bar 307 is controlled to adjust the light / dark component (brightness adjustment) of the color chart displayed in the window 301.

  A slider bar 308 controls the red-green component (chromaticity adjustment) of the background color chart displayed in the window 302 by controlling the slider bar 308. A slider bar 309 controls the blue-yellow component (chromaticity adjustment) of the background color chart displayed in the window 302 by controlling the slider bar 309. Reference numeral 310 denotes a slider bar, and the slider bar 307 is controlled to adjust the light-dark component (brightness adjustment) of the background color chart displayed in the window 302.

  Reference numeral 311 denotes a condition setting file designation button. The condition setting file designation button 311 is operated. Accordingly, the conditions describing the illumination color temperature, illumination illuminance, color chart color information (chromaticity, luminance, etc.), and background color chart color information (chromaticity, luminance, etc.) for various setting items on the user interface 300 are described. A file can be selected from the main memory 102.

  That is, the user can store setting values for various setting items on the user interface 300 in the main memory 102 as a condition file. When adjustment is performed using the stored setting values in the condition file, the corresponding setting values specified in the condition file are set in various setting items on the user interface 300 by specifying the condition file. It is possible to set.

  Reference numeral 312 denotes a color chart measurement button. When the color chart measurement button 312 is operated, the luminance of the color chart and the background color chart displayed in the windows 301 and 302 of the projector 107 and the monitor 115 are measured, and XYZ data is acquired.

  Reference numeral 313 denotes an image correction (correction parameter creation) button. When the image correction button 306 is operated, the above-described image correction processing is executed, and the image correction information as the processing result is stored in a designated output destination (for example, the address of the HDD 105). Reference numeral 314 denotes an end button. When the end button 314 is operated, the image correction application is ended and the user interface 300 is closed.

  Next, the operation of the image correction application will be described with reference to FIG.

  FIG. 4 is a state transition diagram showing the operation of the image correction application according to the first embodiment of the present invention.

  In state 401, an initialization operation such as securing a memory area is performed.

  Next, in the state 402, a user operation determination waiting state in the user interface 300 of FIG. 3 is entered. Here, when the text box 303 is operated, the state 403 is entered. When the text box 304 is operated, the state 404 is entered.

  When any of the slider bars 305 to 307 is operated, the state 405 is entered. When the condition setting file designation button 311 is operated, the flow proceeds to the state 406. When the color chart measurement button 312 is operated, the state 407 is entered. When the image correction button 313 is operated, the state 408 is entered. When the end button 314 is operated, the state 409 is entered.

  In state 403, xy chromaticity coordinates (x, y) are calculated from the input color temperature (K). At this time, the chromaticity (x, y) is calculated from the white color temperature Tc according to the following equations 1-3.

  In state 404, Yn is calculated from the input illumination illuminance and XnYnZn of the illumination environment is calculated by the following equation 4.

  At this time, the color between the XYZ of the projector white and the XnYnZn of the illumination environment is displayed on the color chart based on the correspondence between the RGB values stored in the projector 107 and the measured values XYZ. The monitor 115 displays monitor white on the color chart, and both the projector 107 and the monitor 115 display (R, G, B) = (128, 128, 128) signal values on the background color chart. And

  In the state 405, for the color chart and background color chart of the projector 107, a color reflecting an adjustment result (adjustment value (color signal value (chromaticity, luminance, etc.)) adjusted by the user) is displayed.

  In state 406, a condition setting file is designated.

  In the state 407, the color chart and the background color chart currently displayed on the projector 107 and the monitor 115 are measured by the photometer 109.

  In state 408, image correction is performed in accordance with step S207 described above.

  In state 409, after completion processing such as memory release, the operation of the image correction application is terminated.

  Next, details of various correction parameter setting processing in step S206 will be described with reference to FIG.

  FIG. 5 is a flowchart showing details of the correction parameter setting process according to the first embodiment of the present invention.

  In step S501, an initialization operation such as securing a memory area is performed.

  In step S502, the monitor white point XnYnZn_mon, the projector white point XnYnZn_pro, the background luminance Yb_mon, and Yb_pro are set from the measurement values (color chart measurement value and background color chart measurement value) measured in step S205.

  In step S503, it is determined whether Yn calculated in state 405 is zero. If it is 0 (YES in step S503), the process proceeds to step S503a, and the environment parameter indicating the observation environment is set to dark. Thereafter, the process proceeds to step S505. On the other hand, if it is not 0 (NO in step S503), the process proceeds to step S504.

  In step S504, it is determined whether Yn calculated in the state 405 satisfies Expression 5. If satisfied (YES in step S504), the process proceeds to step S504b, where the environmental parameter indicating the observation environment is set to dim. Thereafter, the process proceeds to step S505. On the other hand, if Expression 5 is not satisfied (NO in step S504), the environment parameter indicating the observation environment is set as average. Thereafter, the process proceeds to step S505.

  In step S505, end processing such as memory release is performed.

  Here, the environmental parameter dark is a dark state (Yn = 0 state), dim is a slightly dark state (Yn <monitor luminance / 5 state), and average is a standard state (Yn> monitor luminance / 5 state). Is shown. For each environmental parameter, a constant (such as a luminance adaptation factor) in a CIECAM02 conversion formula described later is determined in advance.

  Next, details of the image correction processing in step S207 will be described with reference to FIG.

  FIG. 6 is a flowchart showing details of the image correction processing according to the first embodiment of the present invention.

  In step S601, an initialization operation such as securing a memory area is performed.

  In step S602, RGB data is stored for all pixel values of the image selected by the image processing application.

  In step S603, the RGB data of the pixel to be processed is converted from XYZ data according to Expression 6.

  This conversion is performed using an ICC profile prepared by the manufacturer of the monitor 115, which is the calibration target device, or a conversion formula created from the measured values. In addition, although examples of γ conversion and a conversion matrix are described here as conversion colors, a conversion matrix such as a 3DLUT, a GOG model, a GOGO model, or a 1DLUT may be used.

  Regarding the RGB data here, the monitor 115 is assumed to be RGB_mon_k, and the projector 117 is assumed to be RGB_pro. For the XYZ data, the monitor 115 is XYZ_mon_k, and the projector 117 is XYZ_pro (k = 1 to the total number of pixels).

  The monitor gamma is γ_mon, the projector gamma is γ_pro, the monitor RGB after γ conversion is RGB_mon ′, and the projector RGB before γ conversion is RGB_pro ′.

  In step S604, the monitor white point XnYnZn_mon, the projector white point XnYnZn_pro, the background luminance Yb_mon, and Yb_pro are set from the color chart measurement value and the background color chart measurement value measured in step S205.

  In step S605, conversion from XYZ_mon_k to JCH_k is performed using a conversion formula of CIECAM02 described later.

  In step S606, conversion from JCH_k to XYZ_pro_k is performed using an inverse conversion formula of CIECAM02 described later.

  In step S607, conversion from XYZ data to RGB data is performed using Expression 7.

  The conversion here is performed using an ICC profile prepared by each manufacturer for the projector 107 as the target device or a conversion formula created from the measured values. In addition, although examples of γ conversion and a conversion matrix are described here as conversion colors, a conversion matrix such as a 3DLUT, a GOG model, a GOGO model, or a 1DLUT may be used.

  In step S608, it is determined whether or not the processing in steps S603 to S607 has been completed for all pixels. If not completed (NO in step S608), the processing target pixel is selected, and the process returns to step S603. On the other hand, if completed (NO in step 608), the process advances to step S609.

  In step S609, end processing such as memory release is performed.

<Conversion formula of color perception model CIECAM02>
The entire processing flow of CIECAM02 forward conversion will be described by dividing it into three conversion units: chromatic adaptation, cone response, and psychological value conversion.

  In the chromatic adaptation unit, XYZ values are converted into cone spectral sensitivities using Equation 8, and signals of each cone are normalized with the value of the white point of the light source using Equation 10. The adaptation coefficient D is calculated by Expression 11. Finally, by using Equation 9, the values are converted into XYZ values corresponding to the light source under the observation environment.

  In the cone response unit, the XYZ value is converted into the spectral sensitivity of the cone by Expression 12, and is converted into the cone response value after adaptation according to the intensity of the amount of light entering the eye by Expression 13.

  The psychological value conversion unit converts the cone response value into a signal value of an achromatic color response and an opposite color response in the visual cortex using Expressions 14, 15, and 16, and converts the signal values to Expressions 17 and 18 Using Equation 19, the perceptual lightness J value, the perceptual saturation C value, and the perceptual hue h value are converted.

  In the CIECAM02 inverse transformation, an observation condition parameter is set according to the observation environment, an achromatic color response Aw is newly calculated in the forward transformation step, and the reverse step of the forward transformation unit is performed from the Aw and JCh values and the coefficients. Thus, conversion into XYZ values is performed.

  As described above, according to the first embodiment, the parameters for performing color correction in each illumination environment are adjusted for the color chart and its background color chart, and the adjusted color chart and background color chart are measured by the measuring instrument. taking measurement. Then, a correction parameter (correction coefficient) is calculated based on the measured value, and color correction is performed according to the correction parameter to perform highly accurate color prediction and correction so that the color appearance of the monitor and the projector can be seen in the lighting environment. It is possible to match regardless of.

<Embodiment 2>
In the second embodiment, not only a single color chart but also a color chart corresponding to one scale after adjustment of the color chart in the four directions of left, right, up and down in the dialog window of FIG. Processing for display will be described.

  Only differences from the first embodiment will be described below.

  FIG. 7 is a view showing a user interface for image correction according to the second embodiment of the present invention.

  Note that operations on the user interface are performed using an input device such as the keyboard 111 and the mouse 112. The user can execute desired image correction by operating various controls prepared on the user interface using these input devices.

  In the user interface 700, reference numeral 701 denotes a window for displaying an adjustment color chart (main color chart), which displays colors according to the user's initial settings. A window 702 displays a background color chart of the adjustment color chart, and displays a color according to the user's initial setting.

  A color chart display window 703 is a color chart (sub-color chart) of a color (peripheral color) when the slider bar 709 is moved by one scale in the red direction with respect to the color of the main color chart displayed in the window 701. ) Is displayed. A color chart display window 704 is a color chart (sub color chart) of a color (peripheral color) when the slider bar 710 is moved by one scale in the blue direction with respect to the color of the main color chart displayed in the window 701. ) Is displayed.

  A color chart display window 705 is a color chart (sub-color chart) of a color (peripheral color) when the slider bar 709 is moved by one graduation with respect to the color of the main color chart displayed in the window 701. ) Is displayed. A color chart display window 706 is a color chart (sub-color chart) of a color (peripheral color) when the slider bar 710 is moved by one scale in the yellow direction with respect to the color of the main color chart displayed in the window 701. ) Is displayed.

  A text box 707 sets the color temperature of the lighting environment. Reference numeral 708 denotes a text box, which sets the illuminance of the lighting environment.

  A slider bar 709 controls the red-green component of the main color chart displayed in the window 701 by controlling the slider bar 709. A slider bar 710 controls the blue-yellow component of the main color chart displayed in the window 701 by controlling the slider bar 710. Reference numeral 711 denotes a slider bar. By controlling the slider bar 711, the light-dark component of the main color chart displayed in the window 701 is adjusted.

  A slider bar 712 controls the red-green component of the background color chart displayed in the window 702 by controlling the slider bar 712. Reference numeral 713 denotes a slider bar. By controlling the slider bar 713, the blue-yellow component of the background color chart displayed in the window 702 is adjusted. A slider bar 714 controls the light-dark component of the background color chart displayed in the window 702 by controlling the slider bar 713.

  Reference numeral 715 denotes a condition setting file designation button. When the condition setting file designation button 715 is operated, a condition file in which the illumination color temperature, illumination illuminance, color chart (primary color chart and sub color chart) color information, and background color chart color information are selected from the main memory 102 is selected. To do. Reference numeral 716 denotes a color chart measurement button. When the color chart measurement button 716 is operated, the brightness of the color chart and the background color chart displayed in the windows 701 and 702 of the projector 107 and the monitor 115 are measured, and XYZ data is acquired.

  Reference numeral 717 denotes an image correction button. When the image correction button 717 is operated, the image correction process is executed according to a predetermined process, and the image correction information as a result of the process is stored in a specified output destination (for example, the address of the HDD 105). Reference numeral 718 denotes an end button. When the end button 718 is operated, the image correction application is ended.

  Next, the operation of the image correction application will be described with reference to FIG.

  FIG. 8 is a state transition diagram showing the operation of the image correction application according to the second embodiment of the present invention.

  In state 801, an initialization operation such as securing a memory area is performed.

  Next, in a state 802, a user operation determination waiting state in the user interface 700 of FIG. 7 is entered. Here, when the text box 707 is operated, the flow goes to the state 803. When the text box 708 is operated, a transition is made to state 804.

  When any one of the slider bars 709 to 714 is operated, the state 805 is entered. When the condition setting file designation button 715 is operated, the state 806 is entered. When the color chart measurement button 717 is operated, the process proceeds to the state 807. When the image correction button 717 is operated, the flow goes to the state 808. When the end button 717 is operated, the state 809 is entered.

  In state 803, xy chromaticity coordinates are calculated from the input color temperature (K). At this time, chromaticity (x, y) is calculated from the white color temperature Tc according to Equations 1 to 3.

  In the state 804, Yn is calculated from the input illumination illuminance by Equation 4, and XnYnZn of the illumination environment is calculated.

  At this time, the color between the XYZ of the projector white and the XnYnZn of the illumination environment is displayed on the color chart based on the correspondence between the RGB values stored in the projector 107 and the measured values XYZ. As for the monitor 115, monitor white is displayed on the color chart, and both the projector 107 and the monitor 115 display a signal value of (R, G, B) = (128, 128, 128) on the background color chart. Shall.

  In the state 805, the color reflecting the adjustment result (adjustment value (color signal value (chromaticity, luminance, etc.))) adjusted by the user is displayed for the color chart and the background color chart of the projector 107.

  In state 806, a condition setting file is designated.

  In the state 807, the color meter and the background color sample currently displayed in the windows 701 and 702 of the projector 107 and the monitor 115 are measured by the photometer 109.

  In state 808, image correction is performed in accordance with step S207 described above.

  In state 809, after the end operation such as memory release is performed, the operation of the image correction application is ended.

  As described above, according to the second embodiment, in addition to the effects described in the first embodiment, the adjustment of the color chart and the background color chart is performed in four directions of red-green and blue-yellow after adjustment. By performing the color display after adjustment, fine adjustment is facilitated. As a result, it is possible to improve the adjustment work efficiency of the color chart and its background color chart, and therefore it is possible to set a more accurate color correction coefficient (correction parameter).

<Embodiment 3>
In the third embodiment, the processing in the case where only the color chart and the background color chart are displayed on the full screen in the dialog window in FIG.

  Only differences from the first embodiment will be described below.

  FIG. 9 is a diagram showing a user interface for image correction according to the third embodiment of the present invention.

  In the user interface 900, reference numeral 901 denotes a window for displaying an adjustment color chart, which displays a color corresponding to a user's initial setting held in advance. Reference numeral 902 denotes a window for displaying a background color chart of the adjustment color chart, and displays a color corresponding to a user's initial setting held in advance. A color chart RGB display 903 calculates and displays the current RGB values of the color chart. Reference numeral 904 denotes a background color chart RGB display, in which the current RGB value of the background color chart is calculated and displayed.

  In the third embodiment, the adjustment operation for the colors of the color chart and the background color chart is realized by using various keys of the keyboard 111 which is an input device. Here, in particular, operations corresponding to various operation controls shown in the user interface of FIG. 3 are assigned to predetermined keys on the keyboard 111, and adjustment operations are executed in accordance with operations on the predetermined keys.

  Next, the operation of the image correction application will be described with reference to FIG.

  FIG. 10 is a state transition diagram showing the operation of the image correction application according to the third embodiment of the present invention.

  In state 1001, an initialization operation such as securing a memory area is performed.

  Next, in a state 1002, a user operation determination wait state in the user interface 900 of FIG. 9 is entered. If any one of the left (green), right (red), up (yellow), down (blue), PageUp (bright), and PageDown (dark) of the numeric keypad is operated, the state 1003 is entered.

  When the enter key is operated, the state 1004 is entered. When the space key is operated, the state 1005 is entered. When the escape key is operated, the state 1006 is entered.

  In the state 1003, for the color chart and background color chart of the projector 107, a color reflecting an adjustment result (adjustment value (color signal value (chromaticity, luminance, etc.))) adjusted by the user is displayed. Further, the current RGB values of the color chart and the background color chart are displayed in windows 901 and 902.

  In the state 1004, the color meter and the background color sample currently displayed in the windows 901 and 902 of the projector 107 and the monitor 115 are measured by the photometer 109.

  In state 1005, image correction is performed in accordance with step S207 described above.

  In the state 1006, after the end operation such as the memory release is performed, the operation of the image correction application is ended.

  As described above, according to the third embodiment, in addition to the effects described in the first embodiment, regarding the adjustment of the color chart and the background color chart, only the color chart and the background color chart are the elements that affect human vision. By doing so, it is possible to more closely approximate the actual image observation state. This makes it possible to set a color correction coefficient with higher accuracy.

<Embodiment 4>
In the fourth embodiment, not only a single color chart but only a color chart and a background color chart are displayed on the full screen in the dialog window of FIG. A process for displaying a color chart corresponding to the above will be described.

  Only differences from the first embodiment will be described below.

  FIG. 11 is a diagram showing a user interface for image correction according to the fourth embodiment of the present invention.

  In the user interface 1100, reference numeral 1101 denotes a window for displaying an adjustment color chart (main color chart), and displays a color corresponding to a user's initial setting held in advance. Reference numeral 1102 denotes a window for displaying a background color chart of the adjustment color chart, and displays a color corresponding to a user's initial setting held in advance.

  Reference numeral 1103 denotes a color chart display window. The color chart (auxiliary color chart) of the color (peripheral color) when the right key (red) of the numeric keypad is pressed with respect to the color of the main color chart displayed in the window 1101. indicate. A color chart display window 1104 indicates a color chart (auxiliary color chart) of a color (peripheral color) when the lower part of the numeric keypad (blue) is pressed with respect to the color of the main color chart displayed in the window 1101. indicate.

  Reference numeral 1105 denotes a color chart display window. The color chart (auxiliary color chart) of the color (peripheral color) when the left key (green) on the numeric keypad is pressed is selected with respect to the color of the main color chart displayed in the window 1101. indicate. Reference numeral 1106 denotes a color chart display window. The color chart (auxiliary color chart) of the color (peripheral color) when the numeric keypad (yellow) is pressed with respect to the color of the main color chart displayed in the window 1101 is displayed. indicate.

  Reference numeral 1107 denotes a color chart RGB display, in which the current RGB values of the main color chart are calculated and displayed. Reference numeral 1108 denotes a background color chart RGB display, and the current RGB value of the background color chart is calculated and displayed.

  Next, the operation of the image correction application will be described with reference to FIG.

  FIG. 12 is a state transition diagram showing the operation of the image correction application according to the fourth embodiment of the present invention.

  In state 1201, an initialization operation such as securing a memory area is performed.

  Next, in state 1202, the user interface 1101 of FIG. Here, when any one of the left (green), right (red), up (yellow), down (blue), PageUp (bright), and PageDown (dark) of the numeric keypad is operated, the state 1203 is entered.

  When the enter key is operated, a transition is made to state 1204. When the space key is operated, the state 1205 is entered. When the escape key is operated, the flow goes to the state 1206.

  In the state 1203, for the color chart and background color chart of the projector 107, a color reflecting an adjustment result (adjustment value (color signal value (chromaticity, luminance, etc.)) adjusted by the user) is displayed. Further, the current RGB values of the color chart and the background color chart are displayed in windows 1107 and 1108.

  In the state 1204, the color meter and the background color sample currently displayed on the windows 1101 and 1102 of the projector 107 and the monitor 115 are measured by the photometer 109.

  In state 1205, image correction is performed in accordance with step S207 described above.

  In state 1206, after performing an end operation such as memory release, the operation of the image correction application is ended.

  As described above, according to the fourth embodiment, in addition to the effects described in the third embodiment, regarding the adjustment of the color chart and the background color chart, the factors affecting human vision are the color chart and the background color chart. By using only, it is possible to more closely approximate the actual image observation state. Further, with respect to the adjustment of the color chart and the background color chart, fine adjustment is facilitated by executing color display after adjustment in four directions of red-green and blue-yellow after adjustment. As a result, it is possible to improve the adjustment work efficiency of the color chart and the background color chart, and therefore it is possible to set a more accurate color correction coefficient.

<Other embodiments>
<Display color chart>
In the above-described embodiment, the white color chart is used as the color chart to be displayed, but it is also possible to display a color chart other than white and set a correction coefficient as a correction parameter. In addition to a single color chart, a plurality of color charts can be used. In addition to a gradation image, a natural image, or a color chart, a gradation image or a natural image can be displayed in the dialog window as a color chart.

<Display background>
In the above embodiment, a gray single color background color chart is used for the background color chart to be displayed. However, a background color chart other than gray can be displayed and a correction coefficient as a correction parameter can be set. In addition to a single background color chart, a plurality of background color charts can be used. Further, a gradation image or a natural image can be displayed as a background color chart, or a gradation image or a natural image can be displayed in the dialog window as a background color chart.

<Display equipment>
In the above embodiment, an example has been given for matching the color reproduction of the projector 107 (target device (display device)) and the monitor 115 (calibration target device), but the present invention is not limited to this. In other words, the calibration target is not limited to the monitor 115, and any color output device (output device) such as a printer, a projector, a TV, a digital still camera, or a digital video camera can be targeted.

<Display text color>
Although the display character color of the dialog window of FIG. 9 of the third embodiment and the dialog window of FIG. 11 of the fourth embodiment on the projector 107 and the monitor 115 is black, it can be displayed in any color.

<Full screen display>
In the display of the dialog window of FIG. 9 of the third embodiment and the dialog window of FIG. 11 of the fourth embodiment on the projector 107 and the monitor 115, display is performed so that bars and window edges are displayed as the dialog window components. is doing. However, the display method is not limited to this. For example, by making the display window size of the dialog window larger than the original screen size of the projector 107 or the monitor 115, it is possible to completely display only the color chart and the background color chart.

  Although the embodiment has been described in detail above, the present invention can take an embodiment as a system, apparatus, method, program, storage medium, or the like. Specifically, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowchart shown in the drawing) that realizes the functions of the above-described embodiments is directly or remotely supplied to a system or apparatus. In addition, this includes a case where the system or the computer of the apparatus is also achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, or the like.

  Examples of the recording medium for supplying the program include a floppy (registered trademark) disk, a hard disk, and an optical disk. Further, as a recording medium, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD-R), etc. is there.

  As another program supply method, a browser on a client computer is used to connect to an Internet home page. Then, the computer program itself of the present invention or a compressed file including an automatic installation function can be downloaded from a homepage of the connection destination to a recording medium such as a hard disk. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. Let It is also possible to execute the encrypted program by using the key information and install the program on a computer.

  Further, the functions of the above-described embodiments are realized by the computer executing the read program. Further, based on the instructions of the program, an OS or the like running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments can be realized by the processing.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are realized by the processing.

It is a block diagram which shows the hardware constitutions of the image processing apparatus of Embodiment 1 of this invention. It is a flowchart which shows the image correction process which the image correction application of Embodiment 1 of this invention performs. It is a figure which shows the user interface for image correction of Embodiment 1 of this invention. It is a state transition diagram which shows operation | movement of the image correction application of Embodiment 1 of this invention. It is a flowchart which shows the detail of the setting process of the correction parameter of Embodiment 1 of this invention. It is a flowchart which shows the detail of the image correction process of Embodiment 1 of this invention. It is a figure which shows the user interface for image correction of Embodiment 2 of this invention. It is a state transition diagram which shows operation | movement of the image correction application of Embodiment 2 of this invention. It is a figure which shows the user interface for image correction of Embodiment 3 of this invention. It is a state transition diagram which shows operation | movement of the image correction application of Embodiment 3 of this invention. It is a figure which shows the user interface for image correction of Embodiment 4 of this invention. It is a state transition diagram which shows operation | movement of the image correction application of Embodiment 4 of this invention.

Explanation of symbols

101 CPU
102 Main memory 103 SCSI I / F
104 Network I / F
105 HDD
106 Graphic Accelerator 107 Projector 108 RS-232C Unit 109 Photometer 110 Keyboard / Mouse Controller 111 Keyboard 112 Mouse 113 LAN
114 System bus 115 Monitor

Claims (11)

A color processing method for generating color reproduction information for correcting a display color of a target display device by an image processing device,
A display process for displaying the color chart and the background color chart on the target display device;
An adjustment step of adjusting the display color of the color chart and the background color chart displayed on the target display device;
The color chart after adjustment by the adjustment step and the display color of the background color chart, the measurement step of measuring the output color of the color chart before adjustment and the background color chart output by the calibration target output device,
A setting step for setting a correction parameter for defining a color correction characteristic between the target display device and the calibration target output device based on a measurement value obtained by the measurement step;
A color processing method comprising: a generation step of generating color reproduction information for correcting the display color of the processing target image based on the correction parameter set in the setting step. The color processing method according to claim 1, wherein the display step displays a main color chart and sub-color charts of surrounding colors and a background color chart as color charts. The setting step determines an environmental parameter indicating an observation environment of the target display device based on a measurement value obtained by the measurement step, and sets a correction parameter including the determined environmental parameter. The color processing method described in 1. The display step displays a correction screen including at least a color chart and a background color chart on the target display device,
The color processing method according to claim 1, wherein the adjustment step adjusts display colors of a color chart and a background color chart on the correction screen using an input device. The display step displays a correction screen including a color chart, a background color chart, and an operation control for adjusting the display color on the target display device,
The color processing method according to claim 1, wherein the adjustment step adjusts display colors of a color chart and a background color chart on the correction screen based on an operation on the correction screen. The color processing method according to claim 1, wherein in the display step, any one of a single color image, a gradation image, and a natural image is displayed as the color chart and the background color chart, respectively. The color processing method according to claim 1, wherein the display step displays at least one of a single color image, a gradation image, and a natural image in addition to the color chart and the background color chart. The adjustment step adjusts the display color of the color chart and the background color chart displayed on the target display device by selecting and reading a file including an adjustment value stored in a storage medium. The color processing method according to claim 1. A color processing device that generates color reproduction information for correcting a display color of a target display device,
Display means for displaying the color chart and the background color chart on the target display device;
Adjusting means for adjusting the display color of the color chart and the background color chart displayed on the target display device;
The color chart after adjustment by the adjustment means and the display color of the background color chart, the measurement means for measuring the color chart before adjustment and the output color of the background color chart output by the calibration target output device,
Setting means for setting a correction parameter for defining a color correction characteristic between the target display device and the calibration target output device based on a measurement value by the measurement means;
A color processing apparatus comprising: generation means for generating color reproduction information for correcting the display color of the processing target image based on the correction parameter set by the setting means.   A program that executes the color processing method according to claim 1 by controlling a color processing apparatus.   A recording medium on which the program according to claim 10 is recorded.

Images