JP2013211733A - Image display device, image display device calibration device, and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely calibrate an image display device at a high speed.SOLUTION: Plural images for colorimetry are displayed in plural different regions, and the images for colorimetry displayed in the respective regions are parallely measured by plural colorimeters. The image display device is calibrated according to measurement values of the plural images for colorimetry. One kind of the image for colorimetry is measured plural times by the colorimeter during a predetermined period, and colorimetry results of each image for colorimetry is acquired according to the measurement values of plural times. Calibration is done according to the colorimetry results of plural kinds of the images for colorimetry. In a case of the image for colorimetry with a luminance value lower than a threshold, the same kind of the image for colorimetry is displayed on all of the plural regions, and the measurement values of the images for colorimetry are parallely outputted to the plural colorimeters during a period of length obtained by dividing a pre-stored measurement time corresponding to the image for colorimetry by the number of colorimeters, so as to acquire the colorimetry results according to the measurement values by all of the colorimeters.

Description

  The present invention relates to an image display device capable of performing calibration using a plurality of colorimeters, a calibration device for an image display device, and a control method therefor.

  In order to maintain display quality with high accuracy in an image display device, a technique for performing calibration and performing image processing adjustment is known. In calibration, a colorimetric image (uniform color image for test, patch image) displayed on the image display device is measured with a colorimeter (sensor), and image processing parameters are based on the colorimetric result. Adjust etc.

There are a wide variety of adjustment items in calibration, and it is necessary to repeat display and color measurement many times for a large number of colorimetric images.
In order to solve the above-described problem, for example, in the technique described in Patent Document 1, a plurality of colorimetric images are measured in parallel using a plurality of measuring devices, thereby measuring each colorimetric image. Although the color time cannot be shortened, the processing time of the entire calibration is shortened.

Japanese Patent Laid-Open No. 10-122819

  However, the technique described in Patent Document 1 does not consider the influence of one color measurement image on the color measurement result of the other color measurement image when performing color measurement in parallel. For example, when two colorimetric images with greatly different RGB pixel values are displayed in parallel, the colorimeter that measures one colorimetric image picks up the light from the other colorimetric image, thereby measuring the colorimetric image. This will affect the color result. Therefore, there is a possibility that calibration cannot be performed with high accuracy.

  SUMMARY OF THE INVENTION An object of the present invention is to calibrate an image display device with high accuracy and high speed.

The present invention displays a plurality of colorimetric images in a plurality of different areas in the screen of the image display device, and a plurality of colorimeters installed for each area displays the colorimetric images displayed in each area. Colorimetric control means for performing measurement of at least one of luminance and chromaticity in parallel;
Calibration means for calibrating the image display device based on measurement values output from the colorimeter for a plurality of predetermined types of colorimetric images;
With
The colorimetric control means causes the colorimeter to perform a plurality of measurements within a predetermined period for one type of colorimetric image,
The calibration means acquires the color measurement results of each color measurement image based on the measurement values for each color measurement image, and performs calibration based on the color measurement results of a plurality of types of color measurement images. Do,
A calibration device for an image display device,
For each type of colorimetric image, it comprises storage means for storing measurement time information indicating the length of the period during which the colorimeter performs measurement,
The colorimetric control means displays the same type of colorimetric image in all of the plurality of areas for the colorimetric image having a luminance value lower than the threshold among the plurality of types of colorimetric images, Same-type parallel image that allows multiple colorimeters to output the measured values for the colorimetric image in parallel within the length of the measurement time corresponding to the colorimetric image divided by the number of colorimeters Perform colorimetric control,
The calibration unit obtains a color measurement result based on a measurement value obtained by all the colorimeters for a color measurement image to be subjected to the same-type image parallel color measurement control. Device.

The present invention displays a plurality of colorimetric images in a plurality of different areas in the screen of the image display device, and a plurality of colorimeters installed for each area displays the colorimetric images displayed in each area. A colorimetric control step of performing at least one measurement of luminance or chromaticity in parallel;
A calibration process for calibrating the image display device based on measurement values output from the colorimeter for a plurality of predetermined types of colorimetric images;
Have
The colorimetry control step causes the colorimeter to perform a plurality of measurements within a predetermined period for one type of colorimetric image,
The calibration step acquires the color measurement results of each color measurement image based on a plurality of measurement values for each color measurement image, and performs calibration based on the color measurement results of a plurality of types of color measurement images. Do,
A control method for a calibration device of an image display device,
A step of reading from the storage means information on the measurement time indicating the length of the period for which the colorimetry is stored for each type of colorimetric image;
The colorimetry control step displays the same type of colorimetric image in all of the plurality of areas for the colorimetric image having a luminance value lower than the threshold among the plurality of types of colorimetric images, Same-type parallel image that allows multiple colorimeters to output the measured values for the colorimetric image in parallel within the length of the measurement time corresponding to the colorimetric image divided by the number of colorimeters Perform colorimetric control,
In the calibration step, for a colorimetric image to be subjected to the same kind of image parallel colorimetric control, a colorimetric result is obtained based on measurement values obtained by all colorimeters. This is a method for controlling the apparatus.

The present invention includes display means for displaying an image based on an input image signal;
Image processing means for performing image processing on the input image signal and outputting to the display means;
A plurality of colorimetric images are displayed in a plurality of different areas in the screen of the display means, and the luminance or chromaticity of the colorimetric images displayed in each area by a plurality of colorimeters installed for each area. Colorimetric control means for performing at least one of the measurements in parallel;
Calibration means for calibrating the image processing means based on measurement values output from the colorimeter for a predetermined plurality of types of colorimetric images;
With
The colorimetric control means causes the colorimeter to perform a plurality of measurements within a predetermined period for one type of colorimetric image,
The calibration means acquires the color measurement results of each color measurement image based on the measurement values for each color measurement image, and performs calibration based on the color measurement results of a plurality of types of color measurement images. Do,
An image display device,
For each type of colorimetric image, it comprises storage means for storing measurement time information indicating the length of the period during which the colorimeter performs measurement,
The colorimetric control means displays the same type of colorimetric image in all of the plurality of areas for the colorimetric image having a luminance value lower than the threshold among the plurality of types of colorimetric images, Same-type parallel image that allows multiple colorimeters to output the measured values for the colorimetric image in parallel within the length of the measurement time corresponding to the colorimetric image divided by the number of colorimeters Perform colorimetric control,
The calibration means is an image display device characterized in that, for a colorimetric image to be subjected to the same image parallel colorimetric control, a colorimetric result is obtained based on measurement values obtained by all colorimeters.

  According to the present invention, it is possible to calibrate an image display device with high accuracy and high speed.

Block diagram showing an image display device of an embodiment The figure which shows arrangement | positioning of the image display apparatus and colorimeter of an Example Graph showing the relationship between the brightness of the colorimetric image and the colorimetric time Flow chart showing calibration process Image table in the embodiment Combination table in the embodiment Display position start table in the embodiment

Example 1
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of an image display apparatus 100 as a first embodiment of the present invention.
The image display apparatus 100 includes an image input unit 101, an image processing unit 102, a color data correction unit 103, a panel unit 104, a colorimetric image generation unit 105, a graphics generation unit 106, a CPU 107, a RAM 108, a ROM 109, and an information transmission / reception unit 110. A colorimetric combination determining unit 111, a colorimetric time setting unit 112, a colorimetric result calculating unit 113, and a calibration control unit 114. The image display apparatus 100 is connected to the PC 300, and the PC 300 is connected to the first color measuring device 200 and the second color measuring device 201.
Hereinafter, each component in FIG. 1 will be described.

  The image input unit 101 receives an image signal input to the image display device 100. The image input unit 101 is an image input terminal such as DP (Display Port), DVI (Digital Visual Interface), or HDMI (High-Definition Multimedia Interface).

  The image processing unit 102 is a processing unit that performs various types of image processing on the image signal input from the image input unit 101. Specific examples of image processing include changes in brightness, changes in contrast, changes in resolution, and the like. The image signal processed in the image processing unit 102 is subjected to color data correction processing in a color data correction unit 103 (to be described later), and then sent to and displayed on a panel unit 104 (to be described later). In addition to this, in the image processing unit 102, a colorimetric image generated by a colorimetric image generation unit 105 described later or a graphic generated by the graphics generation unit 106 with respect to an input image signal. Data superimposition processing is also performed.

  The color data correction unit 103 performs color data correction on the display data generated by the image processing unit 102. Examples of correction performed by the color data correction unit 103 include gamma correction and color gamut correction.

The panel unit 104 displays an image based on the image signal input to the image display device 100 and processed by the image processing unit 102 and the color data correction unit 103. An example of the panel unit 104 is a liquid crystal panel. The liquid crystal panel displays light by projecting light from the back surface of the liquid crystal surface with a backlight and adjusting the transmittance of the liquid crystal.

  The color measurement image generation unit 105 generates a color measurement image. The color measurement image is an image (patch image) displayed when color measurement is performed by a first color measuring device 200 and a second color measuring device 201 described later.

  The graphics generation unit 106 generates graphics data and sends it to the image processing unit 102. Graphics data includes display data such as menus and banners.

  A CPU (Central Processing Unit) 107 performs various controls of the image display apparatus 100.

  The RAM 108 is used for temporarily storing various data. The temporarily stored data includes intermediate data generated by a program executed by the CPU 107, combination table data to be described later, and the like.

  The ROM 109 is used for storing various data as nonvolatile data. Nonvolatile data includes user setting values, colorimetric image data, program data executed by the CPU 107, and the like.

  The information transmission / reception unit 110 is an interface unit for transmitting / receiving information to / from the PC 300 described later. As a means for communicating with the PC 300 via the information transmission / reception unit 110, for example, a USB cable or the like can be used. Specific examples of information exchanged include color measurement start / end instruction information, a display instruction for notifying execution of calibration, and the like.

  When the colorimetric combination determination unit 111 performs parallel colorimetry using a plurality of colorimeters installed in each region by displaying a plurality of colorimetric images in parallel in a plurality of different regions in the screen of the image display apparatus 100. The combination of the colorimetric images is determined. The colorimetric combination determining unit 111 determines the combination of the colorimetric images based on the number of colorimeters used for colorimetry, the number of types of colorimetric images, the RGB values of the colorimetric images, and the like. The order of color measurement is determined for each time, a combination table is created, and the result is stored in the RAM 108. Details will be described later.

  The color measurement time setting unit 112 sets a color measurement time for each color measurement image. The color measurement time is a length of a period of time during which at least one of luminance and chromaticity of the color measurement image is measured by the color measurement device, which is determined for each type of color measurement image. The colorimeter performs a plurality of measurements within this period, and obtains a colorimetric result of the colorimetric image to be measured based on a plurality of measurement values output from the colorimeter. In general, the lower the luminance value of the colorimetric image, the greater the noise during colorimetry, so the measurement time is set longer. FIG. 3 is a diagram illustrating the relationship between the luminance of the color measurement image and the color measurement time. As shown in FIG. 3, the color measurement time of the low-luminance color measurement image (luminance α) tends to be longer than the color measurement time of the high-luminance color measurement image (luminance β). This is because in the measurement of a low-luminance colorimetric image, it is necessary to perform many measurements in order to remove the noise component.

The color measurement result calculation unit 113 calculates a color measurement result based on measurement values obtained by a first color measurement device 200 and a second color measurement device 201 described later. When the different color image parallel colorimetry control for performing parallel colorimetry is performed by causing each colorimeter to output measurement values of different colorimetric images in parallel, the colorimetry result calculation unit 113 performs each colorimetry. The color measurement result of each color measurement image is calculated based on the measured value by the instrument. For example, the color measurement result calculation unit 113 calculates an average value of a plurality of measurement values within a predetermined period of the first color measurement image performed by the first color measurement device 200 to measure the first color measurement image. Calculated as a color result. Further, the color measurement result calculation unit 113 calculates an average value of a plurality of measurement values of the second color measurement image performed by the second color measuring device 201 as a color measurement result of the second color measurement image. To do. In addition, when the same color image parallel colorimetry control is performed in which the colorimetry result calculation unit 113 performs parallel colorimetry by causing all colorimeters to output measurement values of the same colorimetric image in parallel, The color measurement result of the color measurement image is calculated based on the measurement values obtained by all the color measuring devices. For example, the colorimetric result calculation unit 113 may measure the measured values of the colorimetric image performed by the first colorimeter 200 and the measured values of the colorimetric image performed by the second colorimeter 201 a plurality of times. And an average value is calculated, and this is used as the color measurement result of the color measurement image.

  The calibration control unit 114 controls the color measurement image generation unit 105, the graphics generation unit 106, the color measurement combination determination unit 111, the color measurement time setting unit 112, and the color measurement result calculation unit 113, in the image display device 100. Control the calibration process. Further, the calibration control unit 114 performs control such as a color measurement start / end instruction to the first colorimeter 200 and the second colorimeter 201 and acquisition of a measurement value.

  The first colorimeter 200 and the second colorimeter 201 are installed so as to come into contact with the panel unit 104 of the image display apparatus 100, and measure a colorimetric image displayed on the screen of the image display apparatus 100. Items to be measured include brightness and chromaticity. The first color measuring device 200 and the second color measuring device 201 may be separate from the image display device 100, or may be provided integrally with the image display device 100 as one function of the image display device 100. good. In the present embodiment, as illustrated in FIG. 1, a configuration in which a first colorimeter 200 and a second colorimeter 201 that are separate from the image display apparatus 100 are attached to the image display apparatus 100 during color measurement will be described as an example. Do. The first colorimeter 200 and the second colorimeter 201 can set a colorimetric time from a PC 300 described later. In addition, when the color measurement time is not set from the PC 300, the first color measurement device 200 and the second color measurement device 201 can operate by automatically setting the color measurement time.

  When performing calibration, the PC 300 controls the first colorimeter 200 and the second colorimeter 201 to start and end color measurement, acquire measurement values, set the color measurement time and the number of times, and the like. . The PC 300 controls the first colorimeter 200 and the second colorimeter 201 based on an instruction from the image display apparatus 100. The PC 300 receives measurement values from the first colorimeter 200 and the second colorimeter 201 and transmits them to the image display apparatus 100. Further, the PC 300 transmits the luminance threshold value of the colorimetric image set by the user to the image display device 100. The luminance threshold will be described later. Communication between the PC 300 and the colorimeter is performed by connecting the two with a USB cable, for example. The communication means between the PC 300 and the colorimeter may be wireless.

  FIG. 2 is a conceptual diagram showing the arrangement of the colorimeters when calibration is executed in the image display apparatus of this embodiment. In this embodiment, as shown in FIG. 2A, two colorimeters are used in parallel. That is, when the calibration is executed, the first colorimeter 200 and the second colorimeter 201 are attached to the panel unit 104. The image display device 100 displays a colorimetric image at the position where each colorimeter is arranged, and two colorimetric images are measured in parallel by the two colorimeters. FIG. 2B shows a case where different colorimetric images are displayed in parallel, and different colorimetric images are measured in parallel. FIG. 2C illustrates a case where the same colorimetric images are displayed in parallel and the same colorimetric image is measured in parallel.

A calibration process according to the present embodiment will be described.
In the present embodiment, the image display apparatus 100 controls the calibration process. The image display apparatus 100 performs display control of the colorimetric image. In addition, the image display apparatus 100 instructs the first colorimeter 200 and the second colorimeter 201 to start and end color measurement, set the color measurement time, and acquire measurement values via the PC 300. .

  When the colorimeter is connected, the PC 300 detects the number of connected colorimeters and transmits information on the number of connected colorimeters to the image display apparatus 100. The image display apparatus 100 stores information on the number of connected colorimeters received from the PC 300 in the RAM 108.

  Further, the ROM 109 of the image display device 100 stores in advance data relating to a colorimetric image as shown in FIG. 5 as an image table. The image table includes identification information of the colorimetric image, pixel value (RGB), and colorimetric time information. The unit of color measurement time is “seconds”.

  In the present embodiment, a combination table creation process performed by the image display apparatus 100 before starting the calibration process will be described. As shown in FIG. 6, the combination table is a table in which information on the color measurement order, the combination of color measurement images for performing parallel color measurement, and the color measurement time is registered. In this embodiment, the case where the number of connected colorimeters is 2 has been described as an example. Therefore, information on combinations of two colorimetric images is registered in the combination table. When n colorimeters are connected, information on combinations of n colorimetric images is registered in the combination table.

  The color measurement combination determining unit 111 determines a combination of color measurement images (a combination of color measurement images for performing parallel color measurement) and a color measurement order for each combination by a combination table creation process.

First, the colorimetric combination determination unit 111 creates a colorimetric image combination (X, Y) that satisfies the following conditions based on the image data table of FIG.

((Xr-40) <Yr <(Xr + 40)) and ((Xg-40) <Yg <(Xg + 40)) and ((Xb-40) <Yb <(Xb + 40)) (Formula 1)

here,
Xr, Xg, Xb: RGB components Yr, Yg, Yb of the colorimetric image X: RGB components of the colorimetric image Y. Also, the numerical value “40” in the equation is the upper limit value of the difference between the RGB color components that is allowed by a combination of different colorimetric images. That is, in the example of the above formula, two colorimetric images in which the difference between the color components is smaller than 40 are combined for all the RGB colors. The upper limit value is calculated when one of the colorimetric images displayed in parallel is the other colorimetric when two colorimetric images are displayed in parallel on the panel unit 104 and parallel colorimetry is performed with two colorimeters. It is a numerical value that is determined in advance as a numerical value that has an effect on the result below a predetermined allowable level. This upper limit value is determined according to the characteristics of the colorimeter, the required accuracy of calibration, and the like.

In the case of the image table of FIG. 5, combinations of colorimetric images that satisfy the above conditions are (A, B), (A, C), (A, G), (C, D), (C, E), Eleven of (C, F), (C, G), (D, E), (D, F), (E, F), and (H, I). These combinations are groups of colorimetric images each consisting of colorimetric images equal to or less than the number of colorimeters, and the difference in pixel values between the colorimetric images belonging to the same group is smaller than the threshold value. It is a group. The colorimetric combination determination unit 111 selects a plurality of combinations from these combinations so that the same colorimetric images are not included in different combinations. For example, the colorimetric combination determination unit 111 selects the following four combinations from the above eleven combinations.

Combination 1: (A, B)
Combination 2: (C, D)
Combination 3: (E, F)
Combination 4: (H, I)

This is a colorimetric image other than the colorimetric image, in which the difference in pixel value is equal to or greater than a threshold value, compared to any other type of colorimetric image, which will be described later, among all the colorimetric images. Are grouped by the above groups. Note that nine colorimetric images A, B, C, D, E, F, G, H, and I are subject to grouping. Of the colorimetric images that are subject to grouping, One (color measurement image G in the above example) does not belong to any group. As will be described later, such a color measurement image is exceptionally the same as a color measurement image in which the difference in pixel value is equal to or greater than a threshold value when compared with any other type of color measurement image. It shall be handled (similar image parallel colorimetry control is performed).

  The colorimetric combination determination unit 111 registers the selected combination in the combination table. Here, for each combination, the colorimetric combination determination unit 111 sets the longest colorimetric time among the colorimetric times of the colorimetric images belonging to the combination as the “colorimetric time” corresponding to the combination. Register with. For example, in the case of the combination 1, since the color measurement time of the color measurement image A is 900 and the color measurement time of the color measurement image B is 850, the color measurement time corresponding to this combination 1 is 900.

Next, the colorimetric combination determination unit 111 creates a combination that includes the colorimetric image in duplicate for the colorimetric image that does not belong to any of the above combinations, and registers it in the combination table. In the above example, among the images A to J in the image table, the colorimetric images G and J do not belong to any of the above combinations 1 to 4. Therefore, the colorimetric combination determination unit 111 further creates a combination 5 that includes the colorimetric image G in an overlapping manner and a combination 6 that includes the colorimetric image J in an overlapping manner and registers them in the combination table as follows. .

Combination 5: (G, G)
Combination 6: (J, J)

  For these combinations including the same colorimetric image, all of the plurality of colorimeters measure the same colorimetric image. For a combination including the same colorimetric image overlappingly, the colorimetric combination determining unit 111 calculates a value obtained by dividing the colorimetric time of the colorimetric image by the number of colorimeters (2 in this embodiment). Registered in the combination table as “colorimetric time” corresponding to the combination. In the example of the above combination 5, since the colorimetric time of the colorimetric image G is 1000 and the number of colorimeters is 2, 500 is set as the colorimetric time corresponding to the combination 5. Note that the color measurement image G satisfies, for example, the condition of Equation 1 above in combination with the color measurement image A, and therefore, compared with any other type of color measurement image such as the color measurement image J. Although it is not a colorimetric image in which the difference in pixel values is equal to or greater than the threshold value, it is exceptionally treated as equivalent to the colorimetric image J. However, such an exceptional process may not be performed, and the color measurement image G may be combined with another color measurement image that satisfies the condition of Equation 1 to perform the heterogeneous image parallel color measurement control. However, in that case, it takes a long time to measure the color to obtain the color measurement result of the color measurement image G as compared with the case of performing the same image parallel color measurement control.

Here, the reason why the colorimetric time can be divided by the number of colorimeters when the same colorimetric image is measured with a plurality of colorimeters will be described. Usually, when measuring with a colorimeter, the measurement is performed a plurality of times (N times), and the average value of the N measurement values is calculated as the color measurement result. When measuring the same colorimetric image with multiple colorimeters, when the number of colorimeters used is A, the number of measurements M required for each colorimeter is:

M = N / A

It becomes. After measuring M times with each of the colorimeters, calculating the average value of the measurement values of all the colorimeters, the same colorimetry as the colorimetric result obtained by measuring N times with one colorimeter The result can be obtained. By measuring the same colorimetric image with a plurality of colorimeters, a colorimetric result can be obtained in a shorter time than when one colorimeter is used.

  As described above, a combination table as shown in FIG. 6A is created. This combination table is created so that the combination of colorimetric images for performing parallel colorimetry is limited to the combination of colorimetric images with small pixel value differences. According to this combination table, when performing parallel colorimetry, colorimetric images having greatly different pixel values are not displayed in parallel, so that in colorimetry, one colorimetric image is measured by the other colorimetric image. Can be controlled. Thereby, even if it performs parallel color measurement, since it can measure with a high precision, the fall of the precision of a calibration can be suppressed.

  Note that, as shown in FIG. 3, the color measurement image having a lower luminance requires a longer time for color measurement. Therefore, in order to shorten the time required for the entire calibration process, the colorimetric combination determining unit 111 uses the same colorimetric image for a colorimetric image (low-luminance colorimetric image) having a luminance lower than a predetermined threshold. A combination table may be created so as to belong to a combination that includes. The predetermined threshold value may be stored in the ROM 109 in advance, or may be a value that can be set by the user using the PC 300. For example, the colorimetric combination determination unit 111 determines that the colorimetric image in which the average value of the pixel values of each RGB color is equal to or less than the threshold is a low-luminance colorimetric image. A combination table is created so as to belong to a combination including overlapping color images. The colorimetric combination determination unit 111 creates a combination of different colorimetric images for a colorimetric image (high luminance colorimetric image) other than the low luminance colorimetric image and registers it in the combination table.

For example, when the threshold value is 20, in the image table of FIG. 5, the colorimetric images A, C, and G are determined as low-luminance colorimetric images, and the colorimetric images B, D, E, F, H, I and J are determined to be high luminance colorimetric images. The colorimetric combination determination unit 111 creates a combination of different colorimetric images for the high-luminance colorimetric image so that the same colorimetric image is not included in the different combinations, for example, as follows. Register in the table.

Combination 1: (B, D)
Combination 2: (E, F)
Combination 3: (H, I)

  For these combinations, the colorimetric combination determination unit 111 registers the longest colorimetric time of the colorimetric images belonging to the combination in the combination table as the colorimetric time corresponding to the combination. For example, for the combination 1, the colorimetric time for the colorimetric image B is 850 and the colorimetric time for the colorimetric image D is 850, so the colorimetric time corresponding to the combination 1 is 850.

The colorimetric combination determination unit 111 includes a combination of the low-luminance colorimetric images A, C, and G and the high-luminance colorimetric image J that is not included in the above combination, including the same colorimetric image. Are created as follows and registered in the combination table.

Combination 4: (A, A)
Combination 5: (C, C)
Combination 6: (G, G)
Combination 7: (J, J)

  For these combinations, the colorimetric combination determination unit 111 sets a value obtained by dividing the colorimetric time of the colorimetric image belonging to the combination by the number of colorimeters in the combination table as the colorimetric time corresponding to the combination. sign up. For example, for the combination 4, since the colorimetric time of the colorimetric image A is 900 and the number of colorimeters is 2, the colorimetric time corresponding to the combination 4 is 450.

  A combination table as shown in FIG. 6B is created as described above. According to this combination table, since the color measurement is performed in parallel with the two colorimeters for the low luminance colorimetric image, the time required for the color measurement of the low luminance colorimetric image can be shortened, The time required for the entire calibration process can be shortened.

  Further, the colorimetric combination determination unit 111 may create a combination table based on both the difference between the pixel values of the colorimetric images and the luminance of the colorimetric image. That is, for a colorimetric image in which the difference in pixel value is equal to or greater than the threshold value for any of the RGB color components in the relationship between the low-luminance colorimetric image and any other colorimetric image, The same colorimetric image is made to belong to a combination that overlaps. For other color measurement images, a combination of different color measurement images may be created. In the case of the image table of FIG. 5, if the same threshold value as in the above example is used, the colorimetric images A, C, G, and J become colorimetric images belonging to a combination that includes the same colorimetric image. A combination of colorimetric images different from each other for the colorimetric images B, D, E, F, H, and I is created. In this case, the combination table is the same as that in FIG. However, if the image table is different from the example of FIG. 5, both the combination table created based on one of the difference between the pixel values of the colorimetric images and the luminance of the colorimetric image is included. The combination table created based on this is not necessarily the same. According to the combination table created based on both the pixel value difference between the colorimetric images and the luminance of the colorimetric image, the time required for the colorimetry of the low-luminance colorimetric image is shortened, It is possible to suppress interference between different colorimetric images displayed in parallel. Therefore, high-precision calibration can be performed at high speed.

Next, the calibration process of the present embodiment will be described based on the flowchart of FIG.
In step S501, the calibration control unit 114 starts calibration processing. The calibration control unit 114 performs display control such as display of a colorimetric image at the installation position of the colorimeter, warning display of colorimetry start, and banner display. These display controls may be performed when the calibration control unit 114 transmits a display instruction to the PC 300 via the information transmission / reception unit 110. The calibration control unit 114 refers to the display position start table as shown in FIG. 7, and determines the display position and the display number of the colorimetric image according to the number of pixels of the panel unit 104 and the number of connected colorimeters. . The display position start table is determined for each number of connected colorimeters and is stored in the ROM 109. FIG. 7 is a display position start table corresponding to the number of connected colorimeters “2”. When the number of connected colorimeters is N, a display position start table in which display positions of N colorimetric images are defined correspondingly is read. In the display position start table of FIG. 7, X, Y, indicate the coordinates of the upper left pixel of the colorimetric image. In the example of FIG. 7, the colorimetric image measured by the first colorimeter 200 is displayed such that the pixel with the X coordinate of 750 and the Y coordinate of 590 is the upper left pixel. The colorimetric image measured by the second colorimeter 201 is displayed such that the pixel with the X coordinate of 750 and the Y coordinate of 1870 is the upper left pixel. In this embodiment, the number of pixels of the panel unit 104 is 2560 pixels in the horizontal direction (Y direction) × 1600 pixels in the vertical direction (X direction), and the size of the colorimetric image is 100 pixels in the horizontal direction × 100 pixels in the vertical direction.

  In step S502, the calibration control unit 114 refers to the combination table, and the combination of the colorimetric images corresponding to the current colorimetric order is a combination that includes the same colorimetric image or not. It is determined whether it is a combination of colorimetric images. Here, the current color measurement order is n-th (n = 1, 2,...). For example, in the case of the colorimetric order 1 in FIG. 6A, since the combination of the colorimetric images is (A, B), it is determined that the combination is a different colorimetric image. In the case of the color measurement order 6, since the combination of the color measurement images is (J, J), it is determined that they are the same combination of the color measurement images.

  When it is determined in step S502 that the combination includes the same colorimetric image in an overlapping manner (YES), the process proceeds to S506 to S508. If it is determined in S502 that the color measurement images are different combinations (No), the process proceeds to S503 to S505.

  In step S503, the color measurement image generation unit 105 refers to the combination table, and acquires information on the combination of the color measurement images corresponding to the color measurement order n. Then, the colorimetric image generation unit 105 reads the pixel values of the colorimetric image included in the combination from the image table (FIG. 5), and displays the display position of each colorimetric image from the display position start table (FIG. 7). Get information. Here, information on two different colorimetric images is read. The colorimetric image displayed at the position where the measurement by the first colorimeter 200 is performed is the first colorimetric image, and the colorimetric image displayed at the position where the measurement by the second colorimeter 201 is performed is the first. This is called a two-color measurement image. The color measurement image generation unit 105 generates image data in which the first color measurement image and the second color measurement image are drawn at a specified position, and sends the image data to the image processing unit 102. Accordingly, two different color measurement images are displayed on the panel unit 104 in parallel.

  In step S504, the measurement of each colorimetric image is performed in parallel by the two colorimeters, the first colorimeter 200 and the second colorimeter 201. The colorimetric time setting unit 112 acquires information on the colorimetric times of the two colorimeters with reference to the colorimetric time corresponding to the colorimetric order n in the combination table (FIG. 6), and the information transmitting / receiving unit 110 To the PC 300. The PC 300 sets the color measurement time in the first color measurement device 200 and the second color measurement device 201 based on the received color measurement time information.

  In step S505, the colorimetry result calculation unit 113 calculates the average value of the measurement values of the first colorimeter 200, sets this as the colorimetry result of the first colorimetric image, and measures the second colorimeter 201. An average value is calculated and used as the color measurement result of the second color measurement image.

  In step S506, the color measurement image generation unit 105 refers to the combination table, and acquires information on the combination of the color measurement images corresponding to the color measurement order n. Then, the colorimetric image generation unit 105 reads the pixel values of the colorimetric image included in the combination from the image table (FIG. 5), and displays the display position of each colorimetric image from the display position start table (FIG. 7). Get information. Here, information of one colorimetric image is read. The color measurement image generation unit 105 generates image data such that the read color measurement image is displayed at a specified position, and sends the image data to the image processing unit 102. Thereby, the same colorimetric image is displayed on the panel unit 104 in parallel.

  In step S507, the same colorimetric image is measured in parallel by the two colorimeters, the first colorimeter 200 and the second colorimeter 201. The colorimetric time setting unit 112 acquires information on the colorimetric times of the two colorimeters with reference to the colorimetric time corresponding to the colorimetric order n in the combination table (FIG. 6), and the information transmitting / receiving unit 110 To the PC 300. The PC 300 sets the color measurement time in the first color measurement device 200 and the second color measurement device 201 based on the received color measurement time information.

  In step S508, the color measurement result calculation unit 113 calculates the average value by combining the measurement value of the first color measurement device 200 and the measurement value of the second color measurement device 201, and calculates the average value for the color measurement of the color measurement image. As a result.

  In step S509, the calibration control unit 114 corrects the image processing parameters of the image processing unit 102 and the color data correction unit 103 based on the color measurement result calculated in step S505 or step S508. Since a known calibration method can be used as the image processing parameter correction method based on the color measurement result of the color measurement image, a detailed description thereof will be omitted here. For example, based on the difference between the target value of luminance and the target value of chromaticity set for each color measurement image and the color measurement result, the image processing parameter is corrected in a direction to reduce the difference.

  In step S510, the calibration control unit 114 determines whether all colorimetry registered in the combination table has been completed. For example, in the case of the combination table in FIG. 6A, if the current color measurement order n = 6, it is determined that all the color measurements have been completed, and if n <6, all the color measurements are still completed. It is determined that it is not. If it is determined in S510 that all colorimetry has been completed (YES), the process proceeds to step S512, and the calibration process is terminated. At this time, the calibration control unit 114 instructs the graphics generation unit 106 or instructs the PC 300 via the information transmission / reception unit 110 to display a warning or banner for notifying the panel unit 104 of the end of calibration. May be. If it is determined in S510 that all colorimetry has not been completed (No), the calibration control unit 114 proceeds to the process of step S511, increments the colorimetry order by 1, and returns to the process of step S502. .

  According to the calibration process of the present embodiment described above, the time required for calibration can be shortened while suppressing a decrease in calibration accuracy.

  In this embodiment, the example in which the image display device includes a function unit that controls the calibration process has been described. However, an external device such as a PC may include a function unit that controls the calibration process. In this case, for example, the configuration of the image display apparatus includes the image input unit 101, the image processing unit 102, the color data correction unit 103, the panel unit 104, and the information transmission / reception unit 110 in FIG. The PC 300 includes functional units corresponding to the color measurement combination determination unit 111, the color measurement time setting unit 112, the color measurement result calculation unit 113, the calibration control unit 114, the color measurement image generation unit 105, and the graphics generation unit 106. Is provided. The PC 300 is a calibration device to which a plurality of colorimeters separate from the image display device are connected. The PC 300 holds the number of colorimeter connections, an image table, a combination table, and a display position start table, and generates an image signal such that a plurality of color measurement images are displayed at measurement positions by the colorimeter according to the color measurement order. And output to the image display device 100. At the same time, the PC 300 controls the colorimeter to execute color measurement, specify a color measurement time, etc., receives the measurement value from the colorimeter, and calculates the color measurement result. Then, the PC 300 generates data for correcting the parameters (LUT and the like) in the image processing unit 102 and the color data correction unit 103 of the image display device 100 based on the difference between the color measurement result and the calibration target value. Then, the information is transmitted to the information transmitting / receiving unit 110. Calibration is performed by the image display apparatus 100 correcting parameters in the image processing unit 102 and the color data correction unit 103 based on data received from the information transmission / reception unit 110.

In the present embodiment, an example of performing parallel color measurement using a plurality of colorimeters separate from the image display device has been described, but the colorimeter may be provided in the image display device, or the image display A colorimeter that is separate from the apparatus and a colorimeter that is provided in the image display device may be used in combination. For example, in an image display device including one colorimeter, parallel colorimetry is performed in the same manner as in the present embodiment by using the two colorimeters, that is, the colorimeter and a separate colorimeter. If this is done, the processing time can be shortened while suppressing a decrease in calibration accuracy as in the present embodiment.

  In this embodiment, an example of performing parallel color measurement using two colorimeters has been described. However, the number of colorimeters is not limited to the example of the present embodiment as long as the number of colorimeters is two or more.

100: Image display device, 105: Color measurement image generation unit, 109: ROM, 111: Color measurement combination determination unit, 112: Color measurement time setting unit, 113: Color measurement result calculation unit, 114: Calibration control unit, 200: First colorimeter 201: Second colorimeter 300: PC

Claims (6)

Luminance or chromaticity of the colorimetric image displayed in each area by displaying a plurality of colorimetric images in a plurality of different areas in the screen of the image display device and using a plurality of colorimeters installed in each area. Colorimetric control means for performing at least one of the measurements in parallel;
Calibration means for calibrating the image display device based on measurement values output from the colorimeter for a plurality of predetermined types of colorimetric images;
With
The colorimetric control means causes the colorimeter to perform a plurality of measurements within a predetermined period for one type of colorimetric image,
The calibration means acquires the color measurement results of each color measurement image based on the measurement values for each color measurement image, and performs calibration based on the color measurement results of a plurality of types of color measurement images. Do,
A calibration device for an image display device,
For each type of colorimetric image, it comprises storage means for storing measurement time information indicating the length of the period during which the colorimeter performs measurement,
The colorimetric control means displays the same type of colorimetric image in all of the plurality of areas for the colorimetric image having a luminance value lower than the threshold among the plurality of types of colorimetric images, Same-type parallel image that allows multiple colorimeters to output the measured values for the colorimetric image in parallel within the length of the measurement time corresponding to the colorimetric image divided by the number of colorimeters Perform colorimetric control,
The calibration unit obtains a color measurement result based on a measurement value obtained by all the colorimeters for a color measurement image to be subjected to the same-type image parallel color measurement control. apparatus.   The colorimetric control unit is configured to select a colorimetric image having a pixel value difference equal to or greater than a threshold value even when compared with any other type of colorimetric image among the plurality of types of colorimetric images. The image display device calibration apparatus according to claim 1, which is a target of image parallel colorimetry control.   The colorimetric control means includes, for each of the plurality of types of colorimetric images, a colorimetric image that is equal to or less than the number of colorimeters for each colorimetric image that is not the target of the same-type image parallel colorimetric control. Groups are grouped according to groups in which the difference between pixel values of colorimetric images belonging to the same group is smaller than a threshold value, and different types of colorimetric images belonging to the same group are displayed in each of the plurality of regions. The calibration apparatus for an image display device according to claim 1, wherein different color image parallel colorimetric control is performed to cause a plurality of colorimeters to output measurement values for different types of colorimetric images in parallel.   The colorimetry control means measures the longest measurement time among the measurement times corresponding to each of the colorimetric images belonging to the measurement target group in each of the plurality of colorimeters in the heterogeneous image parallel colorimetry control. The calibration device for an image display device according to claim 3, wherein the calibration device is set as a length of a period for performing the operation. Luminance or chromaticity of the colorimetric image displayed in each area by displaying a plurality of colorimetric images in a plurality of different areas in the screen of the image display device and using a plurality of colorimeters installed in each area. A colorimetry control step for performing at least one of the measurements in parallel;
A calibration process for calibrating the image display device based on measurement values output from the colorimeter for a plurality of predetermined types of colorimetric images;
Have
The colorimetry control step causes the colorimeter to perform a plurality of measurements within a predetermined period for one type of colorimetric image,
The calibration step acquires the color measurement results of each color measurement image based on a plurality of measurement values for each color measurement image, and performs calibration based on the color measurement results of a plurality of types of color measurement images. Do,
A control method for a calibration device of an image display device,
A step of reading from the storage means information on the measurement time indicating the length of the period for which the colorimetry is stored for each type of colorimetric image;
The colorimetry control step displays the same type of colorimetric image in all of the plurality of areas for the colorimetric image having a luminance value lower than the threshold among the plurality of types of colorimetric images, Same-type parallel image that allows multiple colorimeters to output the measured values for the colorimetric image in parallel within the length of the measurement time corresponding to the colorimetric image divided by the number of colorimeters Perform colorimetric control,
In the calibration step, for a colorimetric image to be subjected to the same kind of image parallel colorimetric control, a colorimetric result is obtained based on measurement values obtained by all colorimeters. Control method of the device. Display means for displaying an image based on an input image signal;
Image processing means for performing image processing on the input image signal and outputting to the display means;
A plurality of colorimetric images are displayed in a plurality of different areas in the screen of the display means, and the luminance or chromaticity of the colorimetric images displayed in each area by a plurality of colorimeters installed for each area. Colorimetric control means for performing at least one of the measurements in parallel;
Calibration means for calibrating the image processing means based on measurement values output from the colorimeter for a predetermined plurality of types of colorimetric images;
With
The colorimetric control means causes the colorimeter to perform a plurality of measurements within a predetermined period for one type of colorimetric image,
The calibration means acquires the color measurement results of each color measurement image based on the measurement values for each color measurement image, and performs calibration based on the color measurement results of a plurality of types of color measurement images. Do,
An image display device,
For each type of colorimetric image, it comprises storage means for storing measurement time information indicating the length of the period during which the colorimeter performs measurement,
The colorimetric control means displays the same type of colorimetric image in all of the plurality of areas for the colorimetric image having a luminance value lower than the threshold among the plurality of types of colorimetric images, Same-type parallel image that allows multiple colorimeters to output the measured values for the colorimetric image in parallel within the length of the measurement time corresponding to the colorimetric image divided by the number of colorimeters Perform colorimetric control,
An image display apparatus characterized in that the calibration means acquires a color measurement result based on measurement values obtained by all colorimeters for a color measurement image to be subjected to the same kind of image parallel color measurement control.

Images