JP2009141803A - Image processing device, image processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for performing color adjustment in consideration of target brightness at color temperature adjustment of white points. <P>SOLUTION: The target brightness being the target of brightness to be adjusted by a calibration of an image display device is set. Based on the target brightness, initial values of RGB's respective gains are found. A screen is provided in the image display device, and displays the gains to be changed by operating an operation part operated when the RGB's respective gains are adjusted so as to perform brightness adjustment in the image display device. The screen in which the initial values are set as the initial value of the brightness adjustment is displayed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a color calibration technique for an image display device.

  When color calibration is performed on an image display device, there is a method of correcting a secular change by measuring a screen of the image display device using a measuring instrument and adjusting a color based on the measurement result. This method is a method for adjusting the color by adjusting an electronic circuit inside the image display apparatus. Specifically, the measuring device transmits the measured data to an arithmetic processing device inside the image display device. The arithmetic processing unit compares the data received from the measuring instrument with a preset target value, performs a predetermined calculation, and changes the setting of the electronic circuit. Thereby, color calibration is realized.

  Color calibration of an image display device using a measuring instrument includes software calibration and hardware calibration.

  Software calibration is a method of performing color adjustment of an image display device using a video output circuit inside the video signal control device. Since this method does not affect the image display apparatus, there is an advantage that it can be used for any image display apparatus and can be realized at low cost. On the other hand, when performing calibration, since the RGB color gains are adjusted based on the initial setting of the image display device, the luminance is always lowered, and the necessary luminance may not be realized. In addition, since several bits are used for calibration on the video output circuit, there is an adverse effect that the gradation of colors that can be used in actual work is reduced.

  On the other hand, hardware calibration is a method of adjusting and calibrating an analog circuit in the image display apparatus. This method can absorb even the RGB output variations of the video output circuit on the image display device side, so that the dynamic range of the video output circuit can be fully utilized without sacrificing luminance. As a method of hardware calibration, a method in which a user controls and adjusts an electronic circuit adjustment knob on the outside of the housing of the image display device according to an OSD (On Screen Display) screen displayed on the image display device is common. It is. The types of electronic circuit adjustment knobs include white point color temperature, luminance, RGB channel gain, contrast, and gamma.

The details of the method of calibrating the color temperature of the white point is disclosed in Patent Document 1. Patent Document 1 is insufficient to measure the screen brightness of each RGB single-color light, determine the brightness ratio between the three colors, compare with the mixed brightness ratio of the target color temperature, and adjust to the mixed brightness ratio of the target color temperature A method for obtaining each color signal of light to be transmitted is disclosed.
JP-A-5-127620

  When adjusting the target white point color temperature and luminance, it is assumed that the color temperature is adjusted first, then the luminance is adjusted next, and so on. The order of adjusting the color temperature and the brightness may be reversed. In such a case, the method of independently adjusting the color temperature and brightness as in Patent Document 1 reduces the dynamic range of the video output when the target color temperature is adjusted, and the target brightness to be adjusted later. There was a problem that could not be realized. Further, in such a case, since the color temperature must be readjusted by repeating the adjustment step, there is a problem that the burden on the user becomes very large when performing hardware calibration.

  The present invention has been made in view of the above problems, and an object thereof is to provide a technique for performing color adjustment in consideration of target luminance when adjusting the color temperature of a white point.

  In order to achieve the object of the present invention, for example, an image processing apparatus of the present invention comprises the following arrangement.

That is, an image processing apparatus that calibrates an image display apparatus,
Means for setting a target luminance value as a target of the luminance value to be adjusted by the calibration;
Calculation means for obtaining an initial value of each gain of RGB based on the target luminance value;
A gain that is changed by a user operating an operation unit that is provided in the image display device and that is operated when the user adjusts the respective gains of RGB in order to perform luminance adjustment in the image display device. Means for displaying a screen for displaying, the screen having the initial value set as the initial value of the brightness adjustment.

  In order to achieve the object of the present invention, for example, an image processing method of the present invention comprises the following arrangement.

That is, an image processing method performed by an image processing apparatus that calibrates an image display apparatus,
Setting a target luminance value as a target of the luminance value to be adjusted by the calibration;
A calculation step for obtaining an initial value of each gain of RGB based on the target luminance value;
A gain that is changed by a user operating an operation unit that is provided in the image display device and that is operated when the user adjusts the respective gains of RGB in order to perform luminance adjustment in the image display device. And a step of displaying a screen for displaying, wherein the initial value is set as the initial value of the brightness adjustment.

  According to the configuration of the present invention, it is possible to perform color adjustment in consideration of target luminance when adjusting the color temperature of the white point, and as a result, it is easy to calibrate the color temperature and luminance of the white point without repeating each item. It can be carried out.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The embodiment described below shows an example when the present invention is specifically implemented, and is one of the specific examples of the configurations described in the claims.

  FIG. 1 is a block diagram illustrating a hardware configuration example of the image processing apparatus according to the present embodiment. For example, a general PC (personal computer) can be applied to the image processing apparatus.

  The CPU 101 executes processing using programs and data stored in the RAM 103 and the ROM 102, thereby controlling the entire image processing apparatus and executing each process described later as what the image processing apparatus performs.

  The ROM 102 stores setting data and a boot program for the image processing apparatus.

  The RAM 103 has an area for temporarily storing programs and data loaded from an HDD (hard disk drive) 108, data input from the input device 106, and measurement data input from the colorimeter 199. Further, the RAM 103 also has a work area used when the CPU 101 executes various processes. That is, the RAM 103 can provide various areas as appropriate.

  The input device 106 includes a keyboard, a mouse, and the like, and various instructions can be input to the CPU 101 via the input interface 105 when operated by a user of the image processing apparatus.

  As is well known, the colorimeter 199 is a device for measuring colors and is connected to the input interface 105. Data indicating the measurement result by the colorimeter 199 is sent to the RAM 103 and the HDD 108 via the input interface 105.

  The HDD 108 stores an OS (operating system) and programs and data for causing the CPU 101 to execute processes described later as those performed by the image processing apparatus. Further, the HDD 108 stores information described as known information and information that would be used by a person skilled in the art. Programs and data stored in the HDD 108 are appropriately loaded into the RAM 103 under the control of the CPU 101. When the CPU 101 executes processing using the loaded program and data, the image processing device executes each processing described later as performed by the image processing device.

  Access to the HDD 108 is performed via the HDD interface 107.

  The monitor 110 is configured by a CRT, a liquid crystal screen, or the like, and can display a processing result by the CPU 101 using an image, text, or the like. The monitor 110 can also display each screen (GUI: graphical user interface) to be described later. The monitor 110 is connected to the video interface 109.

  Reference numeral 104 denotes a bus, and the CPU 101, ROM 102, RAM 103, input interface 105, HDD interface 107, and video interface 109 are all connected to the bus 104.

  Next, general hardware calibration will be described with reference to FIG.

  FIG. 2 is a block diagram illustrating a functional configuration of a device for performing general hardware calibration.

  In the video signal control apparatus 201, the control unit 202 reads calibration colorimetric data from the storage unit 203 and sends it to the measurement data display unit 204.

  When the measurement data display unit 204 receives the calibration colorimetric data, the measurement data display unit 204 generates a measurement data signal based on the calibration colorimetric data and sends the measurement data signal to the video output analog circuit 252 included in the image display device 251.

  When receiving the measurement data signal, the video output analog circuit 252 displays an image based on the measurement data signal. On the other hand, the measurement unit 205 measures the displayed image. The white point adjustment unit 206 and the gamma adjustment unit 209 calculate each adjustment amount using the measurement value obtained by the measurement unit 205 and the target value read from the storage unit 203, and the calculated adjustment amount is used as an image display device. 251 is displayed.

  The user 301 who sees the display (each adjustment amount) operates the OSD interface 253 to adjust the video output analog circuit 252.

  The above is a series of flow of hardware calibration, and the processing after the measurement by the measurement unit 205 is repeated until each adjustment item converges to the target value.

  Next, a general hardware calibration environment will be described with reference to FIG. FIG. 3 is a diagram illustrating a general hardware calibration environment. Such an environment is also adopted in the present embodiment.

  Reference numeral 401 denotes a video signal control apparatus, which corresponds to the image processing apparatus according to the present embodiment. The video signal control device 401 transmits a video output signal to the image display device 402. The image display device 402 corresponds to the monitor 110. Reference numeral 403 denotes an electronic circuit adjustment knob (operation unit). The electronic circuit adjustment knob 403 is interlocked with the OSD screen 404 displayed on the image display device 402, and the user 406 operates the electronic circuit adjustment knob 403 while referring to the OSD screen 404 to perform various operations. Make adjustments.

  FIG. 4 is a diagram illustrating a display example of the OSD screen 404. Various adjustment targets are displayed in a list on the OSD screen 404, and the user 406 uses the electronic circuit adjustment knob 403 to select which one is to be adjusted. For example, when “contrast / brightness” is selected as an adjustment target, a contrast / brightness detail setting screen 802 is displayed instead of the OSD screen 404. Therefore, the user 406 can adjust the values of contrast and brightness (hereinafter, luminance) by operating the electronic circuit adjustment knob 403.

  On the other hand, when the user operates the electronic circuit adjustment knob 403 to select “color adjustment” on the OSD screen 404, a gain adjustment detail setting screen 803 is displayed instead of the OSD screen 404. Accordingly, the user 406 can adjust the gain of each of the RGB colors by operating the electronic circuit adjustment knob 403. The RGB color gains affect the maximum output of each RGB output. That is, it affects the chromaticity and color temperature of the white point.

  Next, calibration processing for the image display device (in this embodiment, the monitor 110) performed by the image processing device will be described with reference to FIG. 10 showing a flowchart of the processing. Note that a program and data for causing the CPU 101 to execute the processing according to the flowchart of FIG. Such programs and data are appropriately loaded into the RAM 103 under the control of the CPU 101. Then, when the CPU 101 executes processing using the loaded program and data, the image processing apparatus executes processing according to the flowchart of FIG.

  First, since the user sets the target color temperature value and the target luminance value of the white point using the input device 106, in step S1101, the set target color temperature value and the target luminance value are acquired in the RAM 103.

  Here, the user calibrates the colorimeter 199 and then attaches (pastes) it on the screen of the monitor 110. Thereafter, the user adjusts the contrast of the monitor 110. There are several methods for adjusting the contrast. For example, gray gradation patches up to (R, G, B) = (0, 0, 0), (8, 8, 8),..., (255, 255, 255) are displayed on the screen of the monitor 110. . Then, the electronic circuit adjustment knob 403 provided in the monitor 110 is adjusted by adjusting the highlight portion, the shadow portion, and the halftone gradation so that the user can visually recognize the gradation. Such adjustment has already been described with reference to FIG.

  Then, after the contrast adjustment, if the optimum contrast cannot be obtained, the contrast adjustment is performed again. On the other hand, if obtained, the user uses the electronic circuit adjustment knob 403 or the input device 106 to input an instruction to start the processing from step S1006.

  In step S1106, an appropriate gain analysis is performed before the color temperature adjustment in step S1107. Here, the “appropriate gain” is an initial value of each RGB color gain for realizing the target luminance value, and by obtaining the initial value in advance, the color temperature within a range where the target luminance value can be realized. Can be adjusted.

As an appropriate gain analysis method, first, the relationship between the brightness and gain of the monitor 110 is simply investigated. As shown in FIG. 11, there are 4 points to be investigated (2 points when the brightness is 0%, 0% and 100%, 2 points when the brightness is 100%, 2 points, 0% and 100%) The brightness of the white point. Here, a general image display device, when each RGB color gain to 0% brightness is from becoming 0 cd / m ² as possible, RGB colors gain 0% point is approximated to 0 cd / m ² deep. Therefore, in step S1106, first, the luminances a and b shown in FIG. 11 are measured. FIG. 11 is a diagram illustrating a correspondence relationship between the luminance value and the gain.

  For this purpose, in step S1106, the screen shown in FIG. FIG. 12 is a diagram illustrating a display example of a screen for obtaining a reasonable gain.

  The user who sees such a display sets the respective gains of R, G, and B to 100% and sets the brightness to 0% by the above-described operation. The operation result is reflected in the area 1222. Then, after the user places the colorimeter 199 on the area 1222 (the operation is not necessary if the colorimeter 199 is positioned on the area 1222 from the beginning), the user uses the input device 106 to start the “Start” button 1223. Instruct. As a result, the CPU 101 controls the colorimeter 199 and measures the area 1222. Based on the measurement result (measurement value), the luminance value is obtained. The luminance value is “a” shown in FIG. When the user instructs the “forward” button 1225 using the input device 106, the screen shown in FIG. 13 is displayed on the monitor 110. FIG. 13 is a diagram illustrating a display example of a screen for obtaining a reasonable gain.

  The user who sees such a display sets the brightness to 100% by the above-described operation. The operation result is reflected in the area 1228. After that, the user places the colorimeter 199 on the area 1228 (the operation is not necessary if the colorimeter 199 is located on the area 1228 from the beginning), and then the “start” button 1229 is used using the input device 106. Instruct. As a result, the CPU 101 controls the colorimeter 199 and measures the area 1228. Based on the measurement result (measurement value), the luminance value is obtained. The luminance value is “b” shown in FIG. When the user instructs the “forward” button 1231 using the input device 106, the CPU 101 uses the luminance values “a” and “b” obtained by the above measurement and the target luminance value to obtain a reasonable gain value. Calculate

  A reasonable gain value is calculated based on the following colors:

Reasonable gain value = 100 × d / c
Where c = (a + b) / 2
When d = target luminance value and an appropriate gain value are obtained, the screen shown in FIG. 14 is displayed on the monitor 110. FIG. 14 is a diagram illustrating a display example of a screen for notifying the appropriate gain value.

  In the screen illustrated in FIG. 14, the initial value (reasonable gain value) of each of R, G, and B is calculated as 78%. Thereby, the user can know the initial values of the respective gains of R, G, and B. When the user uses the input device 106 to instruct the “forward” button 1235, the process proceeds to step S1007.

  In step S1107, the color temperature of the white point is adjusted. Details of the processing in this step will be described later. Next, when an instruction to end the process in this step, that is, an instruction to end the color temperature adjustment is input via the input device 106, the process proceeds to step S1109 via step S1108. On the other hand, unless such an instruction is input, the process returns to step S1107 via step S1108.

  In step S1109, brightness adjustment is performed. Details of the processing in this step will be described later. Next, when an instruction to end the process in this step, that is, an instruction to end the luminance adjustment is input via the input device 106, the process proceeds to step S1111 via step S1110. On the other hand, unless such an instruction is input, the process returns to step S1109 via step S1110.

  In step S1111, gamma adjustment is performed. Several gamma adjustment methods are conceivable. For example, a method of correcting the output characteristics of the video output RGB gain to the output characteristics of the target gamma may be used.

  Next, the processing in step S1107, that is, the color temperature adjustment of the white point by RGB color gain control will be described with reference to FIGS.

  FIG. 5 is a flowchart showing details of the processing in step S1107.

  First, when the processing in step S1107 is started, the screen shown in FIG. FIG. 7 is a diagram showing a display example of a screen for informing the user of the color temperature that changes in conjunction with the gain being adjusted by the user operating the electronic circuit adjustment knob 403. In FIG. 7, reference numeral 1201 denotes a screen for informing the user of the color temperature.

  Reference numeral 1206 denotes an area for displaying the respective gains of R, G, and B. Each of R, G, and B is provided with a slider 1208 that indicates the corresponding gain.

  The user operates the electronic circuit adjustment knob 403 provided in the monitor 110 to adjust each gain. The adjusted gain is reflected in the position of the slider 1208. That is, the position of the slider 1208 is appropriately changed in conjunction with the operation of the electronic circuit adjustment knob 403 by the user (in accordance with the gain set by the operation). Of course, the gain operated by the electronic circuit adjustment knob 403 is acquired as described above, and the position of each slider 1208 is determined according to the acquired gain value. It should be noted that the slider 1208 is not a type that the user operates left and right. The result of operating the electronic circuit adjustment knob 403 is displayed in an area 1205.

  Here, 1207 indicates the appropriate gain value, and the user operates the electronic circuit adjustment knob 403 while referring to the appropriate gain value to adjust each gain.

  The user places the colorimeter 199 on the area 1205 (the operation is not necessary if the colorimeter 199 is located on the area 1205 from the beginning), and then instructs the “start” button 1204 using the input device 106. . As a result, in step S501, the CPU 101 controls the colorimeter 199 and starts measuring the area 1205 (current white point, for example, (R, G, B) = (255, 255, 255) color signal). Let

  Next, in step S502, the color temperature is calculated from the measurement value in step S501. The measured value may be a spectral distribution emissivity or XYZ. In the case of spectral emissivity, it is converted to XYZ by a predetermined method. Thereafter, the color temperature (current color temperature) is calculated from XYZ. There are several methods for calculating the color temperature from XYZ. For example, McCamy (1992) proposes the following polynomial approximation as a simple calculation method for obtaining the color temperature T from the chromaticity coordinates x and y. .

T = −437n ³ + 3601n ² −6861n + 5514.31
Here, n is as follows.

n = (x−0.3320) / (y−0.1858)
Further, the chromaticity coordinates x and y are obtained from XYZ by the following formula.

x = X / (X + Y + Z)
y = Y / (X + Y + Z)
By the above method, the current color temperature can be obtained from the measured value. The obtained current color temperature is displayed in the display area 1203.

  In step S503, a difference value between the current color temperature (displayed in the display area 1203) obtained in step S502 and the target color temperature value (displayed in the display area 1202) is calculated. .

  In step S504, the difference value obtained in step S503 is compared with a preset threshold value. Then, it is determined whether or not the following expression is satisfied.

Current color temperature-target color temperature | <threshold ε
If it is satisfied, the process according to the flowchart of FIG. 5 is terminated. On the other hand, if such an expression is not satisfied, the process proceeds to step S505.

  In step S505, a color temperature adjustment amount for achieving the target color temperature from the current color temperature, that is, an RGB color gain adjustment amount is calculated and displayed on the monitor 110. There are several methods for calculating the RGB color gain adjustment amounts. For example, the following method is used.

  FIG. 6 is a flowchart showing details of the processing in step S505.

  First, in step S901, the colorimeter 199 uses Red (for example, 255, 0, 0 for an 8-bit signal), Green (0, 255, 0), Blue (0, 0, 255), White (255, 255, 255). ). Each color is displayed in area 1205. And each measured is acquired as R (Xr, Yr, Zr), G (Xg, Yg, Zg), B (Xb, Yb, Zb), W (Xw, Yw, Zw). Since the RGB colors are in a linearly independent relationship, the following 3 × 3 matrix is obtained in step S902.

| X | | Xr Xg Xb || R |
| Y | = | Yr Yg Yb || G |
| Z | | Zr Zg Zb || B |

| R | | Xr Xg Xb | ^-1 | X |
| G | = | Yr Yg Yb | | Y |
| B | | Zr Zg Zb | | Z |
Next, in step S903, the target XYZ is calculated from the target color temperature. The method for calculating the chromaticity from the color temperature is, for example, calculated using the following polynomial approximation obtained from the experimental values described in the New Color Handbook [Second Edition] P69.

y = 3.000x < ² > + 2.870x-0.275
x = −4.6070 × 10 ⁹ / T ³ + 2.9678 × 10 ⁶ / T ² + 0.09911 × 10 ³ /T+0.244063
(When color temperature T is about 4000 to 7000K)
x = -2.0064 × 10 ⁹ / T ³ + 1.9018 × 10 ⁶ / T ² + 0.24748 × 10 ³ /T+0.237040
(When color temperature T is about 7000-25000K)
Using the above formula, the target chromaticity is calculated from the target color temperature, and then the target XYZ is calculated. That is, in order to convert from chromaticity x, y to XYZ, conversion is performed based on the luminance Yw of the current white point. The conversion formula is as follows.

X = (xy) × Yw
Y = Yw
Z = (1-x) / (y-1) * Yw

In step S904, the target RGB is obtained from the target XYZ obtained in step S903 using the matrix obtained in step S902.

  Returning to FIG. 5, the user increases or decreases the corresponding gain by operating the electronic circuit adjustment knob 403. Therefore, in step S 506, the current RGB temperature is obtained and the current color temperature is updated, and the screen is updated. The display of 1201 is updated. Then, the process returns to step S504, and the subsequent processes are performed.

  Here, when the user uses the input device 106 to instruct the “forward” button 1211 on the screen 1201, the process proceeds to step S 1109 via step S 1108 and causes the monitor 110 to display the screen illustrated in FIG. 9. FIG. 9 is a diagram illustrating a display example of a screen for adjusting the luminance.

  FIG. 8 is a flowchart showing details of the processing in step S1109.

  In FIG. 9, reference numeral 1212 denotes a screen for adjusting the luminance.

  The user places the colorimeter 199 on the area 1214 (the operation is not necessary if the colorimeter 199 is located on the area 1214 from the beginning), and then instructs the “start” button 1213 using the input device 106. . As a result, in step S601, the CPU 101 controls the colorimeter 199 to start measurement within the area 1214 (current white point, for example, color signal of (R, G, B) = (255, 255, 255)). Let

  Next, in step S602, the current luminance value is calculated from the measurement value measured in step S601. The measured value may be a spectral distribution emissivity or XYZ. In the case of spectral emissivity, it is converted to XYZ by a predetermined method. If the measured value is XYZ, the Y component is the luminance. The obtained luminance value is displayed in the display area 1216.

  Next, in step S603, a difference value between the luminance value obtained in step S602 (displayed in the display area 1216) and the target luminance value (displayed in the display area 1215) is obtained.

  Next, in step S604, a comparison process between the difference value obtained in step S603 and a preset threshold value is performed. Then, it is determined whether or not the following expression is satisfied.

| Current brightness-Target brightness | <Threshold ε
If it is satisfied, the process according to the flowchart of FIG. 8 is terminated. On the other hand, if such an expression is not satisfied, the process proceeds to step S606.

  Since the user adjusts the brightness using the input device 106, in step S606, the input brightness is reset as the current brightness value, and the display on the screen 1212 is updated. Then, the process returns to step S604, and the subsequent processes are performed.

  Here, if the user uses the input device 106 to instruct the “forward” button 1219 on the screen 1212, the process proceeds to step S 1111 via step S 1110.

  In this way, if the appropriate gain value is not calculated and presented, the target brightness cannot be achieved no matter how many times the target brightness adjustment is performed after the color temperature adjustment when adjusting the color temperature and brightness of the white point. There is. In such a case, it is necessary to return to the color temperature adjustment and perform the readjustment, which is very burdensome for the user.

  However, in the present embodiment, by calculating a reasonable gain value and presenting it to the user, the user can adjust the target color temperature while considering the target luminance. In addition, about the presentation method to a user of a reasonable gain value, it is not limited to the form shown in FIG. 7, You may use another presentation method.

[Other Embodiments]
Needless to say, the object of the present invention can be achieved as follows. That is, a recording medium (or storage medium) in which a program code of software that realizes the functions of the above-described embodiments is recorded is supplied to the system or apparatus. Needless to say, such a storage medium is a computer-readable storage medium. Then, the computer (or CPU or MPU) of the system or apparatus reads and executes the program code stored in the recording medium. In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiment, and the recording medium on which the program code is recorded constitutes the present invention.

  Further, by executing the program code read by the computer, an operating system (OS) or the like running on the computer performs part or all of the actual processing based on the instruction of the program code. Needless to say, the process includes the case where the functions of the above-described embodiments are realized.

  Furthermore, it is assumed that the program code read from the recording medium is written in a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer. After that, based on the instruction of the program code, the CPU included in the function expansion card or function expansion unit performs part or all of the actual processing, and the function of the above-described embodiment is realized by the processing. Needless to say.

  When the present invention is applied to the recording medium, program code corresponding to the flowchart described above is stored in the recording medium.

It is a block diagram which shows the hardware structural example of the image processing apparatus which concerns on embodiment of this invention. It is a block diagram which shows the function structure of the apparatus for performing general hardware calibration. It is a figure which shows the environment of a general hardware calibration. 6 is a diagram illustrating a display example of an OSD screen 404. FIG. It is a flowchart which shows the detail of the process in step S1107. It is a flowchart which shows the detail of the process in step S505. It is a figure which shows the example of a display of the screen for letting a user know the color temperature which changes in conjunction with the gain under adjustment by operating the knob 403 for electronic circuit adjustment. It is a flowchart which shows the detail of the process in step S1109. It is a figure which shows the example of a display of the screen for adjusting a brightness | luminance. It is a flowchart of the calibration process with respect to the image display apparatus which an image processing apparatus performs. It is a figure which shows the correspondence of a luminance value and a gain. It is a figure which shows the example of a display of the screen for calculating | requiring a valid gain. It is a figure which shows the example of a display of the screen for calculating | requiring a valid gain. It is a figure which shows the example of a display of the screen for alert | reporting a reasonable gain value.

Claims (5)

An image processing apparatus for calibrating an image display apparatus,
Means for setting a target luminance value as a target of the luminance value to be adjusted by the calibration;
Calculation means for obtaining an initial value of each gain of RGB based on the target luminance value;
A gain that is changed by a user operating an operation unit that is provided in the image display device and that is operated when the user adjusts the respective gains of RGB in order to perform luminance adjustment in the image display device. An image processing apparatus comprising: means for displaying a screen for displaying, the screen having the initial value set as the initial value of the brightness adjustment. The calculating means includes
Luminance values as a result of measuring the screen of the image display device using a colorimeter when the gains of R, G, and B are set to 100% and the brightness to 0% are represented by a,
Luminance values as a result of measuring the screen of the image display device using a colorimeter when the gain of each of R, G, and B is set to 100% and the brightness to 100% are represented by b,
The target brightness value is d,
The image processing apparatus according to claim 1, wherein the initial value is calculated as 100 × d / c (c = (a + b) / 2). An image processing method performed by an image processing apparatus that calibrates an image display apparatus,
Setting a target luminance value as a target of the luminance value to be adjusted by the calibration;
A calculation step for obtaining an initial value of each gain of RGB based on the target luminance value;
A gain that is changed by a user operating an operation unit that is provided in the image display device and that is operated when the user adjusts the respective gains of RGB in order to perform luminance adjustment in the image display device. An image processing method comprising: displaying a screen for displaying, the screen having the initial value set as the initial value of the brightness adjustment.   A program for causing a computer to execute the image processing method according to claim 3.   A computer-readable storage medium storing the program according to claim 4.

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