JP2015088847A - Image processing apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase of the time required for creating a color conversion profile, and to prevent precision of the obtained color conversion profile from being reduced.SOLUTION: High-speed base data DH obtained by using a high-speed colorimeter include colorimetric results of all patch images P forming an image for colorimetry. The high-speed base data DH in which luminance of the patch images becomes equal to or higher than a threshold value, become first high-speed base data DH1 and the high-speed base data DH in which the luminance of the patch images P becomes lower than the threshold value become second high-speed base data DH2. Low-speed base data DL obtained by using a low-speed colorimeter include colorimetric results of the patch images P in which the luminance of the patch images P becomes lower than the threshold value in the high-speed base data DH. Combination base data DC then include the first high-speed base data DH1 in which the luminance of the patch images P becomes equal to or higher than the threshold value in the high-speed base data DH, and the low-speed base data DL.

Description

  The present invention relates to an image processing apparatus and a program.

  As a prior art described in the publication, when performing color matching of a color monitor, depending on the type of measuring instrument (contact type, non-contact type, etc.) that measures the color of the image displayed on the color monitor, There is one that changes the target luminance (see Patent Document 1).

JP 2005-250265 A

  An object of the present invention is to suppress an increase in time required for creating a color conversion profile and to suppress a decrease in accuracy of the obtained color conversion profile.

According to the first aspect of the present invention, the first colorimetry is based on the result of comparing the characteristics of the first colorimeter that measures the color of the image displayed on the display screen of the display device with the characteristics of the second colorimeter. Determining means for determining the content of the first image to be measured by the measuring device and the content of the second image to be measured by the second color measuring device, and the first image displayed on the display screen by the display device The second color measurement obtained by measuring the first color measurement result obtained by measuring the color with the first color meter and the second image displayed on the display screen by the display device with the second color meter. The image processing apparatus includes a combining unit that combines the color results to generate a combined colorimetric result and a generating unit that generates a color conversion profile corresponding to the display device based on the combined colorimetric result.
The invention according to claim 2 is characterized in that the first color measuring device has a measurement speed faster than the second color measuring device, and the second color measuring device has higher measurement accuracy than the first color measuring device. The image processing apparatus according to claim 1.
According to a third aspect of the present invention, the determination means performs a colorimetric measurement using the first colorimeter on the colorimetric image including the first image and the second image displayed on the display screen by the display device. The image processing apparatus according to claim 1, wherein the content of the first image and the content of the second image are determined based on the above.
According to a fourth aspect of the present invention, the determination means performs a result of measuring the low gradation image and the high gradation image displayed on the display screen by the display device using the first colorimeter and the second colorimeter. The image processing apparatus according to claim 1, wherein the content of the first image and the content of the second image are determined based on the information.
According to a fifth aspect of the present invention, the determining means determines the content of the first image and the content of the second image based on input / output characteristics of the first colorimeter and the second colorimeter. The image processing apparatus according to claim 1 or 2, wherein the image processing apparatus is an image processing apparatus.
The invention according to claim 6 is based on the result of comparing the characteristics of the first colorimeter and the characteristics of the second colorimeter that measure the color of the image displayed on the display screen of the display device. A function for determining a content of a first image to be measured by one colorimeter and a content of a second image to be measured by the second colorimeter; and the first image displayed on the display screen by the display device The first colorimetric result obtained by measuring the color with the first colorimeter and the second image obtained by measuring the second image displayed on the display screen by the display device with the second colorimeter. A program for realizing a function of creating a combined color measurement result by combining two color measurement results and a function of creating a color conversion profile corresponding to the display device based on the combined color measurement result.

According to the first aspect of the present invention, as compared with the case where the present configuration is not provided, an increase in time required for creating the color conversion profile is suppressed, and a decrease in accuracy of the obtained color conversion profile is suppressed. be able to.
According to the second aspect of the present invention, as compared with the case where the present configuration is not provided, an increase in the time required for creating the color conversion profile is further suppressed, and the accuracy of the obtained color conversion profile is further reduced. Can be suppressed.
According to the third aspect of the present invention, color measurement can be easily performed as compared with the case where the present configuration is not provided.
According to the fourth aspect of the present invention, the number of images used for color measurement can be reduced as compared with the case where the present configuration is not provided.
According to the fifth aspect of the present invention, the number of images used for color measurement can be reduced as compared with the case where the present configuration is not provided.
According to the sixth aspect of the present invention, as compared with the case where the present configuration is not provided, an increase in time required for creating the color conversion profile is suppressed, and a decrease in accuracy of the obtained color conversion profile is suppressed. be able to.

It is the figure which showed an example of the structure of the image display system to which embodiment of this invention is applied. It is the figure which showed the hardware constitutions of the computer apparatus. 3 is a diagram illustrating measurement performance of a high-speed colorimeter and a low-speed colorimeter used in Embodiment 1. FIG. 6 is a diagram for explaining the relationship between the measurement accuracy of the high-speed colorimeter and the low-speed colorimeter used in Embodiment 1. FIG. 4 is a flowchart for explaining a procedure for creating a color conversion profile in the first embodiment. FIG. 6 is a diagram schematically showing a relationship among high-speed base data, low-speed base data, and composite base data in the first embodiment. 6 is a diagram illustrating measurement performance of a high-speed colorimeter and a low-speed colorimeter used in Embodiment 2. FIG. FIG. 10 is a diagram for explaining the relationship between the measurement accuracy of the high-speed colorimeter and the low-speed colorimeter used in the second embodiment. 10 is a flowchart for explaining a procedure for creating a color conversion profile in the second embodiment. It is the figure which showed typically the relationship between the high-speed base data in Embodiment 2, low-speed base data, and synthetic | combination base data. 10 is a flowchart for explaining a procedure for creating a color conversion profile in the third embodiment. FIG. 10 is a diagram schematically showing the relationship among high-speed base data, low-speed base data, and composite base data in the third embodiment. 14 is a flowchart for explaining a procedure for creating a color conversion profile in the fourth embodiment. (A)-(c) is a figure for demonstrating the relationship of the gradation characteristic of the high-speed colorimeter used in Embodiment 4, and a low-speed colorimeter. It is a figure for demonstrating the concept of the threshold value in Embodiment 4. FIG. It is the figure which showed typically the relationship between the high-speed base data in Embodiment 4, low-speed base data, and synthetic | combination base data. 14 is a flowchart for explaining a procedure for creating a color conversion profile in the fifth embodiment. FIG. 10 is a diagram for explaining a relationship between L ^* a ^* b ^* characteristics of the high-speed colorimeter and the low-speed colorimeter used in the fifth embodiment. It is the figure which showed typically the relationship between the high-speed base data in Embodiment 5, low-speed base data, and synthetic | combination base data.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Embodiment 1>
FIG. 1 is a diagram illustrating an example of a configuration of an image display system 10 to which the exemplary embodiment of the present invention is applied.
The image display system 10 displays on the display screen 31 a computer apparatus 20 as an example of an image processing apparatus that creates image data for display and the like, and an image based on the image data generated by the computer apparatus 20. A display device 30 and an input device 40 that receives an input to the computer device 20 and the like are provided.

  In the image display system 10, the computer device 20 and the display device 30 are connected via, for example, a DVI (Digital Visual Interface), and the computer device 20 and the input device 40 are connected via, for example, a USB (Universal Serial Bus). ing. The computer device 20 and the display device 30 may be connected via HDMI (High-Definition Multimedia Interface: registered trademark) or DisplayPort instead of DVI.

  The computer device 20 as an example of a determination unit, a synthesis unit, and a creation unit is a so-called general-purpose personal computer. In the computer device 20, image data is created by operating various application software under the management of an OS (Operating System).

  Further, the display device 30 is configured by a device having a function of displaying an image by additive color mixing, such as a liquid crystal display for a PC, a liquid crystal television, or a projector. Therefore, the display method in the display device 30 is not limited to the liquid crystal method. Here, in the present embodiment, it is assumed that the display device 30 displays an image using three colors of red (R), green (G), and blue (B). In FIG. 1, the display screen 31 is provided in the display device 30. However, when a projector is used as the display device 30, for example, the display screen 31 is a screen or the like provided outside the display device 30.

  Furthermore, the input device 40 is composed of, for example, a keyboard device or a mouse device.

  In the image display system 10, for example, an image (display image) based on display image data created using the input device 40 and the computer device 20 is displayed on the display screen 31 of the display device 30. Here, when product design or the like is performed using application software that operates on the computer device 20, it is required to display an image in a correct color on the display screen 31 in the display device 30. Therefore, in this image display system 10, a colorimetric image based on the colorimetric image data created by the computer device 20 is displayed on the display screen 31 by the display device 30, and the colorimetric image displayed on the display screen 31 is displayed. Based on the result of reading the image, a profile creation operation for creating a color conversion profile for correcting the color to be displayed on the display screen 31 can be executed. Here, examples of the color conversion profile include an ICC (International Color Consortium) profile.

  In FIG. 1, a colorimeter 100 used in the profile creation operation and used for reading a colorimetric image displayed on the display screen 31 of the display device 30 is shown together with the image display system 10. In the present embodiment, as the colorimeter 100, the profile creation operation is performed while using the high-speed colorimeter 110 having a relatively high measurement speed and the low-speed colorimeter 120 having a relatively low measurement speed. Is supposed to run.

  Here, each of the high-speed colorimeter 110 and the low-speed colorimeter 120 includes a sensor (not shown) that reads an image with three colors of red (R), green (G), and blue (B). The color measurement image displayed on the display screen 31 can be measured in a so-called full color. Details of each of the high-speed colorimeter 110 and the low-speed colorimeter 120 will be described later.

FIG. 2 is a diagram illustrating a hardware configuration of the computer apparatus 20.
The computer device 20 is realized by a personal computer or the like as described above. As shown in the figure, the computer device 20 includes a CPU (Central Processing Unit) 21 that is arithmetic means, a main memory 22 and an HDD (Hard Disk Drive) 23 that are storage means. Here, the CPU 21 executes various programs such as an OS (Operating System) and application software. The main memory 22 is a storage area for storing various programs and data used for execution thereof, and the HDD 23 is a storage area for storing input data for various programs, output data from various programs, and the like. Further, the computer device 20 includes a communication interface (hereinafter referred to as “communication I / F”) 24 for performing communication with the outside including the input device 40 and the display device 30.

  FIG. 3 is a diagram illustrating the measurement performance of the high-speed colorimeter 110 and the low-speed colorimeter 120 used in the present embodiment. Here, two measurement performance and measurement accuracy are listed as measurement performance. In the profile creation operation of the present embodiment, a plurality of patch images each composed of images of different colors are used as the colorimetric images.

  The high-speed color measuring device 110 as an example of the first color measuring device requires less time to measure the color of each patch image than the low-speed color measuring device 120. As a result, the time required to measure all the plurality of patch images can be shortened. Therefore, when the high-speed colorimeter 110 and the low-speed colorimeter 120 are compared, the high-speed colorimeter 110 has a high measurement speed, and the low-speed colorimeter 120 has a low measurement speed.

  On the other hand, the low-speed color measuring device 120 as an example of the second color measuring device has higher measurement accuracy of the color measurement results obtained by measuring individual patch images than the high-speed color measuring device 110. More specifically, in the low speed colorimeter 120, the measurement accuracy is “high in all brightness” from low brightness to high brightness, whereas in the high speed colorimeter 110, the measurement accuracy is “low brightness”. Low ”.

  Here, the colorimeter 100 includes a so-called contact type arranged in contact with the display screen 31 and a non-contact type arranged in non-contact with the display screen 31. In general, the contact type is used for colorimetry of a liquid crystal display or the like, and the non-contact type is used for colorimetry of a projector (screen) or the like, or for colorimetry of a liquid crystal display or the like with external light illumination. It is done. Here, in the present embodiment, it is assumed that both the high-speed colorimeter 110 and the low-speed colorimeter 120 are configured in a non-contact manner. However, one of the high-speed colorimeter 110 and the low-speed colorimeter 120 may be a contact type and the other may be a non-contact type, and both the high-speed colorimeter 110 and the low-speed colorimeter 120 may be a contact type. It may be composed of.

FIG. 4 is a diagram for explaining the relationship between the measurement accuracy of the high-speed colorimeter 110 and the low-speed colorimeter 120 used in the present embodiment. In FIG. 4, the horizontal axis represents the color value (RGB value) of the image displayed on the display screen 31, and the vertical axis represents the image displayed on the display screen 31 by the high-speed colorimeter 110 or the low-speed colorimeter 120. The luminance (cd / m ² ) obtained in this way. In FIG. 4, the result of the high-speed colorimeter 110 is indicated by a broken line, and the result of the low-speed colorimeter 120 is indicated by a solid line.

In this example, the same result can be obtained by the high-speed colorimeter 110 and the low-speed colorimeter 120 for color values having a luminance of 5 (cd / m ² ) or more. On the other hand, for color values with a luminance of less than 5 (cd / m ² ), the error due to the high speed colorimeter 110 is larger than that of the low speed colorimeter 120. Thus, in the present embodiment, the low-speed colorimeter 120 can measure dark colors, whereas the high-speed colorimeter 110 has difficulty measuring dark colors. . Here, the color value when the luminance is 5 (cd / m ² ) is referred to as (R, G, B) = (R1, G1, B1).

  FIG. 5 is a flowchart for explaining a procedure for creating a color conversion profile in the present embodiment. Here, in the present embodiment, the high-speed colorimeter 110 is set on the display screen 31 of the display device 30 before the creation of the color conversion profile is started.

  First, the computer device 20 causes the display device 30 to sequentially display all patch images constituting the colorimetric image on the display screen 31. In addition, the high-speed colorimeter 110 sequentially measures all patch images displayed on the display screen 31 so that base data including the colorimetric results of the plurality of patch images (hereinafter referred to as high-speed base data). Is measured (step 110).

Next, the computer device 20 calculates the brightness of each patch image constituting the high-speed base data obtained in step 110, and the obtained brightness value is less than a threshold value (in this example, 5 (cd / m ² )). Is extracted (referred to as a low-intensity patch) (step 120). Note that the low-speed colorimeter 120 is set on the display screen 31 of the display device 30 after Step 110 is completed and before Step 130 described below is started.

  Subsequently, the computer device 20 sequentially displays the low-intensity patches extracted in step 120 on the display screen 31 using the display device 30. The low-speed colorimeter 120 measures the base data (hereinafter referred to as low-speed base data) including the color measurement results of the low-luminance patches by sequentially measuring the low-luminance patches displayed on the display screen 31. Perform (step 130).

  Then, the computer device 20 includes the first high-speed base data obtained by removing the second high-speed base data, which is the colorimetry result of the low-intensity patch, from the high-speed base data obtained in Step 110, and the low-speed base data obtained in Step 130. Composite base data is generated by combining the base data (step 140).

  Then, the computer device 20 creates a color conversion profile corresponding to the display device 30 based on the synthesis base data obtained in step 140 (step 150), and completes a series of processing.

  FIG. 6 is a diagram schematically showing the relationship among the high-speed base data DH, the low-speed base data DL, and the composite base data DC in the present embodiment. Here, the high speed base data DH shown in the upper part of the figure is step 110 shown in FIG. 5, the low speed base data DL shown in the middle part of FIG. 5 is step 130 shown in FIG. 5, and the synthesized base data DC shown in the lower part of the figure is the figure. In step 140 shown in FIG.

  First, the high-speed base data DH includes the color measurement results of all the patch images P constituting the color measurement image. Of the high-speed base data DH, the one with the brightness of the patch image P equal to or higher than the threshold is the first high-speed base data DH1, and the one with the brightness of the patch image P less than the threshold is the second high-speed base data DH2. Become. Here, in the present embodiment, a plurality of patch images P included in the first high-speed base data DH1 constitute the first image.

  The low-speed base data DL includes the colorimetric result of the patch image P (low-intensity patch) having the same content as the second high-speed base data DH2 in which the brightness of the patch image P is less than the threshold in the high-speed base data DH. Composed. Therefore, the low-speed base data DL does not include the color measurement result of the patch image P on the high luminance side. Here, in the present embodiment, a plurality of patch images P included in the low speed base data DL constitute the second image.

  The synthesized base data DC includes first high-speed base data DH1 in which the brightness of the patch image P is equal to or higher than a threshold value among the high-speed base data DH and low-speed base data DL. Therefore, the composite base data DC includes the color measurement results of all the patch images P constituting the color measurement image. Here, in the present embodiment, the first high-speed base data DH1 corresponds to the first color measurement result, the low-speed base data DL corresponds to the second color measurement result, and the composite base data DC corresponds to the composite color measurement result. It becomes.

  As described above, in the present embodiment, the display device 30 is configured using the high-speed colorimeter 110 having a relatively high measurement speed and the low-speed colorimeter 120 having a relatively high measurement accuracy. The displayed colorimetric image was measured. This makes it possible to improve measurement accuracy as compared to the case where color measurement is performed using only the high-speed colorimeter 110, for example, and the case where color measurement is performed using only the low-speed colorimeter 120, for example. In comparison, the time required for colorimetry can be reduced. As a result, it is possible to suppress a decrease in accuracy of the color conversion profile created based on the obtained synthesis base data.

  In the present embodiment, after the colorimetric image is first measured using the high-speed colorimeter 110, the patch image whose accuracy is likely to be lowered due to the luminance being too low among the colorimetric images. The re-measurement was performed using the low-speed colorimeter 120. As a result, it is possible to improve the accuracy of the obtained synthesis base data, and as a result, it is possible to improve the accuracy of the obtained color conversion profile.

<Embodiment 2>
The present embodiment is almost the same as the first embodiment, but the measurement accuracy of the high-speed colorimeter 110 is different from that of the first embodiment. As a result, the method for creating the composite base data DC is different from that of the first embodiment. Is different. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 7 is a diagram showing the measurement performance of the high-speed colorimeter 110 and the low-speed colorimeter 120 used in the present embodiment. Note that here, as in the first embodiment, two measurement performances, measurement speed and measurement accuracy, are listed.

In the present embodiment, the measurement speed of the high-speed colorimeter 110 is “high”, and the measurement speed of the low-speed colorimeter 120 is “low”.
On the other hand, in the present embodiment, the measurement accuracy of the low-speed colorimeter 120 is “high in all brightness”, whereas the high-speed colorimeter 110 has a measurement accuracy of “low in low brightness”. In addition, “low in high brightness”.

FIG. 8 is a diagram for explaining the relationship between the measurement accuracy of the high-speed colorimeter 110 and the low-speed colorimeter 120 used in the present embodiment. In FIG. 8, the horizontal axis represents the color value (RGB value) of the image displayed on the display screen 31, and the vertical axis represents the image displayed on the display screen 31 by the high-speed colorimeter 110 or the low-speed colorimeter 120. The luminance (cd / m ² ) obtained in this way. In FIG. 8, the result obtained by the high-speed colorimeter 110 is indicated by a broken line, and the result obtained by the low-speed colorimeter 120 is indicated by a solid line.

In this example, the same results can be obtained by the high-speed colorimeter 110 and the low-speed colorimeter 120 for color values having a luminance of 5 (cd / m ² ) or more and less than 100 (cd / m ² ). it can. On the other hand, for a color value with a luminance of less than 5 (cd / m ² ) and a color value with a luminance of 100 (cd / m ² ) or more, the error due to the high-speed colorimeter 110 is the error of the low-speed colorimeter 120. It is larger than As described above, in the present embodiment, the low-speed colorimeter 120 can measure dark colors and light colors, whereas the high-speed colorimeter 110 measures dark colors and light colors. Has become difficult. Here, the color value when the luminance is 5 (cd / m ² ) is referred to as (R, G, B) = (R1, G1, B1), and the luminance is 100 (cd / m ² ). The color value at that time is called (R, G, B) = (R2, G2, B2).

  FIG. 9 is a flowchart for explaining a procedure for creating a color conversion profile in the present embodiment. Here, also in the present embodiment, the high-speed colorimeter 110 is set on the display screen 31 of the display device 30 before the creation of the color conversion profile is started.

  First, the computer device 20 causes the display device 30 to sequentially display all patch images constituting the colorimetric image on the display screen 31. The high-speed colorimeter 110 measures high-speed base data including the colorimetric results of the plurality of patch images by sequentially measuring all the patch images displayed on the display screen 31 (step 210). .

Next, the computer 20 calculates the brightness of each patch image constituting the high-speed base data obtained in step 210, and the obtained brightness value is a lower threshold value (in this example, 5 (cd / m ^2). )) A low-luminance patch that is less than (step 220), and a patch image (high-luminance patch) in which the obtained luminance value is equal to or greater than the upper threshold (100 (cd / m ² ) in this example). Is called (step 230). Note that the low-speed colorimeter 120 is set on the display screen 31 of the display device 30 after Step 210 is completed and before Step 240 described below is started.

  Subsequently, the computer device 20 sequentially displays the low-intensity patches extracted in step 220 on the display screen 31 using the display device 30. Further, the low-speed colorimeter 120 sequentially measures the low-luminance patches displayed on the display screen 31 so that low-speed base data including the color measurement results of the low-luminance patches (hereinafter referred to as first low-speed base data). Is measured (step 240).

  Next, the computer device 20 sequentially displays the high-intensity patches extracted in step 230 on the display screen 31 using the display device 30. The low-speed colorimeter 120 sequentially measures high-intensity patches displayed on the display screen 31 so that low-speed base data including color measurement results of the high-intensity patches (hereinafter referred to as second low-speed base data). Is measured (step 250).

  Then, the computer device 20 excludes the second high-speed base data that is the color measurement result of the low-intensity patch and the third high-speed base data that is the color measurement result of the high-intensity patch from the high-speed base data obtained in step 210. Then, synthesized base data is created by synthesizing the first high speed base data, the first low speed base data obtained in step 240, and the second low speed base data obtained in step 250 (step 260).

  Then, the computer device 20 creates a color conversion profile corresponding to the display device 30 based on the synthesis base data obtained in step 260 (step 270), and completes a series of processing.

  FIG. 10 is a diagram schematically showing the relationship among the high-speed base data DH, the low-speed base data DL, and the composite base data DC in the present embodiment. Here, the high-speed base data DH shown in the upper part of the figure is Step 210 shown in FIG. 9, and the low-speed base data DL shown in the middle part of FIG. 9 is the combined base data shown in Steps 240 and 250 shown in FIG. Each DC is obtained in step 260 shown in FIG.

  First, the high-speed base data DH includes the color measurement results of all the patch images P constituting the color measurement image. Of the high-speed base data DH, the one in which the brightness of the patch image P is equal to or higher than the lower threshold and lower than the upper threshold becomes the first high-speed base data DH1, and the brightness of the patch image P is lower than the lower threshold. The data becomes the second high-speed base data DH2, and the data where the brightness of the patch image P is equal to or higher than the upper threshold is the third high-speed base data DH3. Here, in the present embodiment, a plurality of patch images P included in the first high-speed base data DH1 constitute the first image.

  The low-speed base data DL includes first low-speed base data DL1 including a colorimetric result of a patch image P (low-intensity patch) having the same content as the second high-speed base data DH2 among the high-speed base data DH, Among the high-speed base data DH, the second high-speed base data DH3 includes the second low-speed base data DL2 configured to include the color measurement result of the patch image P (high luminance patch) having the same content as the third high-speed base data DH3. Therefore, the low-speed base data DL does not include the color measurement result of the patch image P on the medium luminance side. Here, in the present embodiment, a plurality of patch images P included in the low speed base data DL constitute the second image.

  The synthesized base data DC includes the first high-speed base data DH1 in which the brightness of the patch image P in the high-speed base data DH is equal to or higher than the lower threshold and lower than the upper threshold, and the low-speed base data DL (first low-speed base data DL). Base data DL1 and second low-speed base data DL2). Therefore, the composite base data DC includes the color measurement results of all the patch images P constituting the color measurement image. Here, in the present embodiment, the first high-speed base data DH1 is the first color measurement result, and the low-speed base data DL (the first low-speed base data DL1 and the second low-speed base data DL2) is the second color measurement result. The combined base data DC corresponds to the combined color measurement result.

  As described above, in the present embodiment, the display device 30 is configured using the high-speed colorimeter 110 having a relatively high measurement speed and the low-speed colorimeter 120 having a relatively high measurement accuracy. The displayed colorimetric image was measured. This makes it possible to improve measurement accuracy as compared to the case where color measurement is performed using only the high-speed colorimeter 110, for example, and the case where color measurement is performed using only the low-speed colorimeter 120, for example. In comparison, the time required for colorimetry can be reduced. As a result, it is possible to suppress a decrease in accuracy of the color conversion profile created based on the obtained synthesis base data.

  In the present embodiment, after the colorimetric image is first measured using the high-speed colorimeter 110, the accuracy is likely to decrease due to the luminance being too low or too high in the colorimetric image. For the patch image, remeasurement was performed using the low-speed colorimeter 120. As a result, it is possible to improve the accuracy of the obtained synthesis base data, and as a result, it is possible to improve the accuracy of the obtained color conversion profile.

<Embodiment 3>
In the first embodiment, first, the high-speed colorimeter 110 is used to measure all the patch images constituting the colorimetric image, and the low-speed colorimeter 120 uses the obtained high-speed base data. A patch image (low-intensity patch) to be measured (re-measured) has been determined. On the other hand, in the present embodiment, a patch image that performs color measurement using the high-speed colorimeter 110 and a patch image that performs color measurement using the low-speed colorimeter 120 are sorted in the colorimetric image. Thus, the color measurement by the high-speed colorimeter 110 and the color measurement by the low-speed colorimeter 120 are performed. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the present embodiment, it is assumed that the high-speed colorimeter 110 and the low-speed colorimeter 120 have the measurement performance shown in FIGS.

  FIG. 11 is a flowchart for explaining a procedure for creating a color conversion profile in the present embodiment. Here, also in the present embodiment, the high-speed colorimeter 110 is set on the display screen 31 of the display device 30 before the creation of the color conversion profile is started.

  First, the computer device 20 uses a W (white) image (highest gradation image) in which the gradation value of each RGB color is the highest gradation value (R, G, B = 255, 255, 255), and the gradation of each RGB color. A Bk (black) image (lowest gradation image) whose tone value is the lowest gradation value (R, G, B = 0, 0, 0) is sequentially displayed on the display screen 31 using the display device 30. The high-speed colorimeter 110 sequentially measures the W image and Bk image displayed on the display screen 31 (step 310).

  Next, the computer device 20 estimates display characteristics by the display device 30 from the colorimetric results of the W image and the Bk image obtained in step 310, and among the plurality of patch images constituting the colorimetric image, the computer device 20 A patch image (low luminance patch) that is likely to have luminance is predicted (step 320). In step 320, for example, assuming that the gradation characteristic of the display device is γ = 2.2 which is close to the gradation characteristic such as sRGB, the luminance value prediction of the color of the intermediate gradation image is performed.

  Subsequently, the computer device 20 uses the display device 30 to display the remaining patch images obtained by removing the low-intensity patches from the plurality of patch images constituting the colorimetric image based on the prediction result obtained in step 320. 31 are sequentially displayed. The high-speed colorimeter 110 measures the high-speed base data including the colorimetric results of the patch images excluding the low-intensity patches by sequentially measuring the patch images displayed on the display screen 31 (step 330). . Note that the low-speed colorimeter 120 is set on the display screen 31 of the display device 30 after Step 330 is completed and before Step 340 described below is started.

  Next, the computer device 20 causes the display device 30 to sequentially display the low-intensity patches based on the prediction result obtained in step 320. The low-speed colorimeter 120 measures low-speed base data including the colorimetric results of the low-luminance patches by sequentially measuring the low-luminance patches sequentially displayed on the display screen 31 (step 340).

  Then, the computer apparatus 20 creates synthesized base data obtained by synthesizing the high speed base data obtained in step 330 and the low speed base data obtained in step 340 (step 350).

  Then, the computer device 20 creates a color conversion profile corresponding to the display device 30 based on the composite base data obtained in step 350 (step 360), and completes a series of processing.

  FIG. 12 is a diagram schematically showing the relationship among the high-speed base data DH, the low-speed base data DL, and the composite base data DC in the present embodiment. Here, the high-speed base data DH shown in the upper part of the figure is step 330 shown in FIG. 11, the low-speed base data DL shown in the middle part of FIG. 11 is step 340 shown in FIG. In step 350 shown in FIG.

  First, the high-speed base data DH includes color measurement results for all patch images P constituting the color measurement image except for those predicted as low-intensity patches. Therefore, the high-speed base data DH does not include the color measurement result of the low-luminance side patch image P. Here, in the present embodiment, a plurality of patch images P included in the high-speed base data DH constitute the first image.

  In addition, the low-speed base data DL includes the color measurement results for those predicted as low-intensity patches among all the patch images P constituting the color measurement image. Therefore, the low-speed base data DL does not include the color measurement result of the patch image P on the high luminance side. Here, in the present embodiment, a plurality of patch images P included in the low speed base data DL constitute the second image.

  The synthesized base data DC includes high-speed base data DH and low-speed base data DL. Therefore, the composite base data DC includes the color measurement results of all the patch images P constituting the color measurement image. Here, in the present embodiment, the high-speed base data DH corresponds to the first color measurement result, the low-speed base data DL corresponds to the second color measurement result, and the composite base data DC corresponds to the composite color measurement result. .

  As described above, in the present embodiment, the display device 30 is configured using the high-speed colorimeter 110 having a relatively high measurement speed and the low-speed colorimeter 120 having a relatively high measurement accuracy. The displayed colorimetric image was measured. This makes it possible to improve measurement accuracy as compared to the case where color measurement is performed using only the high-speed colorimeter 110, for example, and the case where color measurement is performed using only the low-speed colorimeter 120, for example. In comparison, the time required for colorimetry can be reduced. As a result, it is possible to suppress a decrease in accuracy of the color conversion profile created based on the obtained synthesis base data.

  In this embodiment, first, the highest gradation image as an example of the high gradation image and the lowest gradation image as an example of the low gradation image are displayed on the display screen 31 by the display device 30. Based on the result of colorimetry of the highest gradation image and the lowest gradation image by the high-speed colorimeter 110, a patch image P that is likely to be low in luminance is predicted from a plurality of patch images P constituting the colorimetric image. I made it. Then, using this prediction result, a patch image that is measured by the high-speed colorimeter 110 and a patch image that is measured by the low-speed colorimeter 120 are separated. As a result, it is not necessary to measure the same patch image P with the high-speed colorimeter 110 and the low-speed colorimeter 120, and the time required for colorimetry of the colorimetric image can be reduced.

  In this embodiment, in step 310, the W image and the Bk image are displayed on the display screen 31 and the colorimetry is performed by the high-speed colorimeter 110. In addition to this, the gradation of each RGB color is displayed. A gray (gray) image (halftone image) whose value is located between the highest gradation value and the lowest gradation value may be displayed and measured. In this case, the accuracy in estimating the display characteristics of the display device 30 can be further increased.

<Embodiment 4>
In the third embodiment, first, the color measurement of the W image and the Bk image is performed, and based on the color measurement results of the W image and the Bk image, the patch image and the low speed colorimetry that are measured by the high speed colorimeter 110 And the patch image to be colorimetrically measured by the device 120. On the other hand, in this embodiment, the high-speed colorimeter 110 and the low-speed colorimeter 120 obtain the gradation characteristics of each RGB color, and based on the obtained gradation characteristics of each RGB color, the high-speed colorimeter 110. In this example, the patch image for colorimetry and the patch image for colorimetry by the low-speed colorimeter 120 are sorted. In the present embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 13 is a flowchart for explaining a procedure for creating a color conversion profile in the present embodiment.

  First, the computer device 20 acquires the gradation characteristics (input / output characteristics) of each of the RGB colors of the high-speed colorimeter 110 and the low-speed colorimeter 120 (step 410). Note that the gradation characteristics of the high-speed colorimeter 110 and the gradation characteristics of the low-speed colorimeter 120 may be obtained as measured values or, for example, as specification values.

  Next, the computer 20 sets a threshold value for each color of RGB based on the gradation characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 acquired in step 410 (step 420). The high-speed colorimeter 110 is set on the display screen 31 of the display device 30 until the next step 430 is started.

  Subsequently, based on the threshold values for each color of RGB set in step 420, the computer apparatus 20 is a patch image in which at least one of the RGB color values among the plurality of patch images constituting the colorimetric image is equal to or greater than the threshold value. Is displayed on the display screen 31 using the display device 30. The high-speed colorimeter 110 measures the high-speed base data including the colorimetric results of these patch images by sequentially measuring the patch images displayed on the display screen 31 (step 430). Note that the low-speed colorimeter 120 is set on the display screen 31 of the display device 30 after Step 430 is completed and before Step 440 described below is started.

  Next, the computer device 20 displays a patch image in which the gradation values of each of the RGB colors are less than the threshold value among the plurality of patch images constituting the colorimetric image based on the threshold values of the RGB colors set in step 420. 30 is displayed on the display screen 31. Further, the low speed colorimeter 120 sequentially measures the patch images displayed on the display screen 31 and measures low speed base data including the colorimetric results of these patch images (step 440).

  Then, the computer apparatus 20 creates composite base data obtained by combining the high-speed base data obtained in step 430 and the low-speed base data obtained in step 440 (step 450).

  Then, the computer device 20 creates a color conversion profile corresponding to the display device 30 based on the composite base data obtained in step 450 (step 460), and completes a series of processing.

  FIG. 14 is a diagram for explaining the relationship between the gradation characteristics of each of the RGB colors of the high-speed colorimeter 110 and the low-speed colorimeter 120 acquired in step 410 shown in FIG. 14A shows the relationship between the red (R) input gradation value Rin and the output gradation value Rout, and FIG. 14B shows the green (G) input gradation value Gin and the output gradation. FIG. 14C shows the relationship between the value Gout and the relationship between the input gradation value Bin and the output gradation value Bout of blue (B). In each of FIGS. 14A to 14C, the gradation characteristic of the high-speed colorimeter 110 is indicated by a broken line, and the gradation characteristic of the low-speed colorimeter 120 is indicated by a solid line.

  For example, as shown in FIG. 14A, in the region where the red input tone value Rin is equal to or greater than the red threshold value Rt, the high-speed colorimeter 110 and the low-speed colorimeter 120 use the same red output level. An adjustment value Rout result can be obtained. On the other hand, in the region where the red input tone value Rin is less than the red threshold value Rt, the error of the red output tone value Rout by the high speed colorimeter 110 becomes larger than that of the low speed colorimeter 120. Yes.

  For example, as shown in FIG. 14B, in the region where the green input tone value Gin is equal to or greater than the green threshold Gt, the high-speed colorimeter 110 and the low-speed colorimeter 120 use the same green color. An output gradation value Gout can be obtained. On the other hand, in the region where the green input tone value Gin is less than the green threshold Gt, the error of the green output tone value Gout by the high speed colorimeter 110 is larger than that of the low speed colorimeter 120. Yes.

  Further, for example, as shown in FIG. 14C, in the region where the blue input gradation value Bin is equal to or greater than the blue threshold Bt, the high-speed colorimeter 110 and the low-speed colorimeter 120 use the same blue color. An output gradation value Bout can be obtained. On the other hand, in the region where the blue input tone value Bin is less than the blue threshold Bt, the error of the blue output tone value Bout by the high speed colorimeter 110 becomes larger than that of the low speed colorimeter 120. Yes.

  Here, in this embodiment, as shown in FIGS. 14A to 14C, the gradation value of the red threshold value Rt, the gradation value of the green threshold value Gt, and the gradation value of the blue threshold value Bt are as follows. , May not be the same value. That is, the high-speed colorimeter 110 and the low-speed colorimeter 120 have different gradation characteristics depending on RGB colors.

  FIG. 15 is a diagram for explaining the concept of threshold values (red threshold value Rt, green threshold value Gt, and blue threshold value Bt) in the present embodiment. FIG. 15 shows a three-dimensional orthogonal coordinate system with the red input tone value Rin, the green input tone value Gin, and the blue input tone value Bin as axes.

  In the present embodiment, a patch image in which the red input tone value Rin is greater than or equal to the red threshold value Rt, a patch image in which the green input tone value Gin is greater than or equal to the green threshold value Gt, or the blue input tone value Bin is For patch images that are equal to or greater than the blue threshold Bt, high-speed base data is measured using the high-speed colorimeter 110. On the other hand, a patch image in which the red input tone value Rin is less than the red threshold value Rt, the green input tone value Gin is less than the green threshold value Gt, and the blue input tone value Bin is less than the blue threshold value Bt (see FIG. 15, the low-speed base data is measured using the low-speed colorimeter 120 for the patch image located within the area surrounded by the origin 0, the red threshold value Rt, the green threshold value Gt, and the blue threshold value Bt. become.

  FIG. 16 is a diagram schematically showing the relationship among the high-speed base data DH, the low-speed base data DL, and the composite base data DC in the present embodiment. Here, the high-speed base data DH shown in the upper part of the figure is step 430 shown in FIG. 13, the low-speed base data DL shown in the middle part of the figure is step 440 shown in FIG. 13, and the combined base data DC shown in the lower part of the figure is the figure. These are obtained at step 450 shown in FIG.

  First, the high-speed base data DH includes colorimetric results for all patch images P constituting the colorimetric image other than those whose input tone values of RGB colors are less than the respective threshold values. . Here, in the present embodiment, a plurality of patch images P included in the high-speed base data DH constitute the first image.

  The low-speed base data DL is configured to include the colorimetric results for all the patch images P constituting the colorimetric image whose RGB input color values are less than the respective threshold values. Here, in the present embodiment, a plurality of patch images P included in the low speed base data DL constitute the second image.

  The synthesized base data DC includes high-speed base data DH and low-speed base data DL. Therefore, the composite base data DC includes the color measurement results of all the patch images P constituting the color measurement image. Here, in the present embodiment, the high-speed base data DH corresponds to the first color measurement result, the low-speed base data DL corresponds to the second color measurement result, and the composite base data DC corresponds to the composite color measurement result. .

  As described above, in the present embodiment, the display device 30 is configured using the high-speed colorimeter 110 having a relatively high measurement speed and the low-speed colorimeter 120 having a relatively high measurement accuracy. The displayed colorimetric image was measured. This makes it possible to improve measurement accuracy as compared to the case where color measurement is performed using only the high-speed colorimeter 110, for example, and the case where color measurement is performed using only the low-speed colorimeter 120, for example. In comparison, the time required for colorimetry can be reduced. As a result, it is possible to suppress a decrease in accuracy of the color conversion profile created based on the obtained synthesis base data.

  In this embodiment, first, the gradation characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 are acquired, and a colorimetric image is constructed based on the obtained gradation characteristics. From the plurality of patch images P, the patch image P whose error is likely to be small even in the high-speed colorimeter 110 is measured by the high-speed colorimeter 110, and the patch whose error is likely to be large in the high-speed colorimeter 110. For the image P, the low-speed colorimeter 120 performs colorimetry. As a result, it is possible to improve the accuracy of the obtained synthesis base data, and as a result, it is possible to improve the accuracy of the obtained color conversion profile.

<Embodiment 5>
In the fourth embodiment, the RGB color characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 are acquired, and the high-speed colorimeter 110 performs colorimetry based on the obtained RGB color characteristics. The patch image to be performed and the patch image to be measured by the low speed colorimeter 120 are distributed. In contrast, in the present embodiment, the L ^* a ^* b ^* characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 are acquired, and the high-speed colorimetry is performed based on the obtained L ^* a ^* b ^* characteristics. The patch image that performs colorimetry with the instrument 110 and the patch image that performs colorimetry with the low-speed colorimeter 120 are sorted. In addition, in this Embodiment, about the thing similar to Embodiment 4, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted. In the present embodiment, it is assumed that the high-speed colorimeter 110 and the low-speed colorimeter 120 have the measurement method and measurement performance shown in FIGS.

  FIG. 17 is a flowchart for explaining a procedure for creating a color conversion profile in the present embodiment.

First, the computer apparatus 20 acquires the L ^* a ^* b ^* characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 (step 510). Note that the gradation characteristics of the high-speed colorimeter 110 and the L ^* a ^* b ^* characteristics of the low-speed colorimeter 120 may be obtained as measured values or, for example, as spec values. Absent.

Next, the computer device 20 sets a threshold value for the a ^* value based on the L ^* a ^* b ^* characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 acquired in step 510 (step 520). Here, the threshold value in the a ^* value is determined based on a difference in characteristics between the high speed colorimeter 110 and the low speed colorimeter 120. The high-speed colorimeter 110 is set on the display screen 31 of the display device 30 until the next step 530 is started.

  Subsequently, based on the threshold set in step 520, the computer device 20 displays a part of the patch images of the plurality of patch images constituting the colorimetric image on the display screen 31 using the display device 30. . The high-speed colorimeter 110 measures the high-speed base data including the colorimetric results of these patch images by sequentially measuring the patch images displayed on the display screen 31 (step 530). Note that the low-speed colorimeter 120 is set on the display screen 31 of the display device 30 after Step 530 is completed and before Step 540 described below is started.

  Next, the computer device 20 displays the remaining patch images of the plurality of patch images constituting the colorimetric image on the display screen 31 using the display device 30 based on the threshold value set in step 520. The low-speed colorimeter 120 measures low-speed base data including the colorimetric results of these patch images by sequentially measuring the patch images displayed on the display screen 31 (step 540).

  Then, the computer apparatus 20 creates composite base data obtained by synthesizing the high speed base data obtained in step 530 and the low speed base data obtained in step 540 (step 550).

  Then, the computer device 20 creates a color conversion profile corresponding to the display device 30 based on the synthesis base data obtained in step 550 (step 560), and completes a series of processing.

FIG. 18 is a diagram for explaining the relationship between the L ^* a ^* b ^* characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 acquired in step 510 shown in FIG. In FIG. 18, the horizontal axis is the a ^* value, and the vertical axis is the b ^* value. In FIG. 18, the result obtained by the high-speed colorimeter 110 is indicated by a broken line, and the result obtained by the low-speed colorimeter 120 is indicated by a solid line.

In this example, similar results can be obtained with the high-speed colorimeter 110 and the low-speed colorimeter 120 in a range where the a ^* value is greater than or equal to α and less than β and within a range where γ is greater than and less than δ. On the other hand, in the range where the a ^* value is less than α and the range where β is greater than β and less than γ, the error due to the high speed colorimeter 110 is larger than that of the low speed colorimeter 120. In the following description, these α, β, γ, and δ are referred to as a first threshold value α, a second threshold value β, a third threshold value γ, and a fourth threshold value δ.

  FIG. 19 is a diagram schematically showing the relationship among the high-speed base data DH, the low-speed base data DL, and the synthesized base data DC in the present embodiment. Here, the high-speed base data DH shown in the upper part of the figure is step 530 shown in FIG. 17, the low-speed base data shown in the middle part of FIG. 17 is step 540 shown in FIG. 17, and the synthesized base data DC shown in the lower part of the figure is FIG. Respectively obtained in step 550 shown in FIG.

First, the high-speed base data DH has an a ^* value that is greater than or equal to the first threshold value α and less than the second threshold value β and greater than or equal to the third threshold value γ and less than or equal to the fourth threshold value δ among all the patch images P constituting the colorimetric image. It is comprised including the colorimetry result about what becomes. Of the high-speed base data DH, data obtained based on a range in which the a ^* value is greater than or equal to the first threshold value α and less than the second threshold value β is the first high-speed base data DH1, and the a ^* value is the third threshold value. What is obtained based on a range that is not less than γ and not more than the fourth threshold value δ is the second high-speed base data DH2. Here, in the present embodiment, a plurality of patch images P included in the high-speed base data DH constitute the first image.

Further, the low-speed base data DL is one in which the a ^* value is 0 or more and less than the first threshold value α and the second threshold value β or more and less than the third threshold value γ among all the patch images P constituting the colorimetric image. Containing the colorimetric results for. Of the low-speed base data DL, data obtained based on a range where the a ^* value is 0 or more and less than the first threshold value α becomes the first low-speed base data DL1, and the a ^* value is the second threshold value β or more and What is obtained based on the range that is less than the third threshold γ is the second low-speed base data DL2. Here, in the present embodiment, a plurality of patch images P included in the low speed base data DL constitute the second image.

  The synthesized base data DC includes high-speed base data DH (first high-speed base data DH1 and second high-speed base data DH2) and low-speed base data DL (first low-speed base data DL1 and second low-speed base data DL2). Consists of including. Therefore, the composite base data DC includes the color measurement results of all the patch images P constituting the color measurement image. Here, in the present embodiment, the high-speed base data DH corresponds to the first color measurement result, the low-speed base data DL corresponds to the second color measurement result, and the composite base data DC corresponds to the composite color measurement result. .

  As described above, in the present embodiment, the display device 30 is configured using the high-speed colorimeter 110 having a relatively high measurement speed and the low-speed colorimeter 120 having a relatively high measurement accuracy. The displayed colorimetric image was measured. This makes it possible to improve measurement accuracy as compared to the case where color measurement is performed using only the high-speed colorimeter 110, for example, and the case where color measurement is performed using only the low-speed colorimeter 120, for example. In comparison, the time required for colorimetry can be reduced. As a result, it is possible to suppress a decrease in accuracy of the color conversion profile created based on the obtained synthesis base data.

In this embodiment, first, the L ^* a ^* b ^* characteristics of the high-speed colorimeter 110 and the low-speed colorimeter 120 are acquired, and based on the obtained L ^* a ^* b ^* , From the plurality of patch images P constituting the colorimetric image, the high-speed colorimeter 110 performs colorimetry on the patch image P whose error is likely to be small even in the high-speed colorimeter 110. The patch image P, which is likely to have a large error, is measured by the low-speed colorimeter 120. As a result, it is possible to improve the accuracy of the obtained synthesis base data, and as a result, it is possible to improve the accuracy of the obtained color conversion profile.

DESCRIPTION OF SYMBOLS 10 ... Image display system, 20 ... Computer apparatus, 30 ... Display apparatus, 31 ... Display screen, 40 ... Input device, 100 ... Colorimeter, 110 ... High-speed colorimeter, 120 ... Low-speed colorimeter, DH ... High-speed base Data, DH1 ... first high speed base data, DH2 ... second high speed base data, DH3 ... third high speed base data, DL ... low speed base data, first low speed base data, DL2 ... second low speed base data, DC ... composite base data

Claims (6)

A first image to be measured by the first colorimeter based on a result of comparing the characteristics of the first colorimeter that measures the color of the image displayed on the display screen of the display device with the characteristics of the second colorimeter. Determining means for determining the content of the second image and the content of the second image to be measured by the second colorimeter;
The first color measurement result obtained by measuring the first image displayed on the display screen by the display device with the first colorimeter, and the second image displayed on the display screen by the display device. Combining means for combining the second color measurement result obtained by measuring the color with the second color measuring device to create a combined color measurement result;
An image processing apparatus comprising: a creating unit that creates a color conversion profile corresponding to the display device based on the combined color measurement result.   The image according to claim 1, wherein the first colorimeter has a measurement speed faster than the second colorimeter, and the second colorimeter has higher measurement accuracy than the first colorimeter. Processing equipment.   The determining means is configured to determine the first image based on a result of colorimetry performed on the colorimetric image including the first image and the second image displayed on the display screen by the display device. The image processing apparatus according to claim 1, wherein the content of the second image and the content of the second image are determined.   The determining means is configured to determine the first image based on a result obtained by measuring the low gradation image and the high gradation image displayed on the display screen by the display device using the first colorimeter and the second colorimeter. The image processing apparatus according to claim 1, wherein the content of the image and the content of the second image are determined.   2. The determination unit according to claim 1, wherein the content of the first image and the content of the second image are determined based on input / output characteristics of the first and second colorimeters. Or the image processing apparatus of 2. On the computer,
A first image to be measured by the first colorimeter based on a result of comparing the characteristics of the first colorimeter that measures the color of the image displayed on the display screen of the display device with the characteristics of the second colorimeter. A function for determining the content of the second image and the content of the second image to be measured by the second colorimeter;
The first color measurement result obtained by measuring the first image displayed on the display screen by the display device with the first colorimeter, and the second image displayed on the display screen by the display device. A function of synthesizing a second color measurement result obtained by color measurement with the second color measuring device to create a combined color measurement result;
A program for realizing a function of creating a color conversion profile corresponding to the display device based on the combined color measurement result.

Images