JP6209950B2 - Color reproduction characteristic creation device, color reproduction characteristic creation system, program, and color reproduction characteristic creation method - Google Patents

Description

  The present invention relates to a color reproduction characteristic creation device, a color reproduction characteristic creation system, a program, and a color reproduction characteristic creation method.

  Japanese Patent Laid-Open No. 2004-260688 has a step of inputting and reading color chart electronic image data into a computer of a monitor whose profile is unknown, a step of outputting and displaying the chart image on the monitor, and a profile of the chart image output and displayed on the monitor. Equipped with the other monitor, the stage to capture and record with the electronic camera, the stage to input and read the captured electronic image data to the computer of the other monitor, the stage to output and display the chart photographed image on the screen of the other monitor Color component value output and display processing using the color component value output display processing program, and a color value that associates the color component value with the color value based on the known color characteristic profile of the camera A system for creating a color characteristic profile for a monitor that creates a color characteristic profile for the first monitor of color component values is disclosed. That.

  Patent Document 2 discloses a profile creation device connected to a monitor, in which a first chart printed on a print medium and a second chart displayed on a monitor are simultaneously photographed by an electronic camera. An acquisition means for acquiring image data, an RGB value of each patch constituting the first chart portion in the image data, and an electronic value based on the RGB value and the colorimetric value of each patch constituting the first chart. First color characteristic profile creation means for creating a color characteristic profile of the camera, and RGB values of each patch constituting the second chart portion displayed on the monitor in the image data are acquired, and the RGB values and the electronic camera A second color characteristic profile creating unit that creates a color characteristic profile of a monitor based on the color characteristic profile is disclosed.

  In Patent Document 3, as a color matching method used for matching image output between devices, a common color chart (color chart) is output to a monitor and a printer. Each color chart is measured with a single digital still camera, and the color reproduction characteristics of each device (monitor and printer) obtained as a result of the color measurement are compared to match the color reproduction characteristics of both ( A color matching method for adjusting (output correction) the color reproduction characteristics of a monitor through an appropriate color conversion table (LUT) is disclosed.

JP 2003-6629 A JP 2008-22410 A JP 2007-251237 A

  It is desirable that the color reproduction characteristics are created based on the white reference image, thereby improving the accuracy of the color reproduction characteristics.

According to the first aspect of the present invention, the color reproduction characteristics of the first display device serving as a reference, the color measurement image used for creating the color reproduction characteristics, and the white reference image which is a reference white image, Is displayed on the first display device, the colorimetric image and the white reference image are captured by a photographing unit including a display unit capable of displaying the captured colorimetric image. The first color information used when displaying the image and the color measurement image are displayed on the second display device to be measured, and the white reference image is displayed on the second display device. The colorimetric image is displayed or displayed on a second display unit different from the second display device , the colorimetric image and the white reference image are captured by the imaging unit, and the captured colorimetric image is captured Second color information used when displaying the image on the display unit A color information acquisition unit that acquires the color reproduction characteristic of the first display device and a first color reproduction characteristic generation unit that generates a color reproduction characteristic of the photographing unit based on the first color information And a second color reproduction characteristic creating unit that creates the color reproduction characteristic of the second display device based on the color reproduction characteristic of the photographing unit and the second color information. This is a color reproduction characteristic creation device.
The invention according to claim 2, wherein the color information acquiring unit, thereby acquiring the second color information obtained by both photographing by said photographing means the color measurement image and the white reference image The color reproduction characteristic creating apparatus according to claim 1.
According to a third aspect of the present invention, a determination unit that determines whether a color value when the white reference image included in the second color information is captured is within a predetermined range, and the determination unit includes: when the color value is determined not to be within a predetermined range, the color reproduction according to claim 1 or 2, further comprising a color information correction unit for correcting the second color information It is a characteristic creation device.
According to a fourth aspect of the present invention, there is provided a photographing unit comprising a photographing unit for photographing an image, a display unit capable of displaying an image photographed by the photographing unit, and color reproduction based on the image photographed by the photographing unit. Color reproduction characteristic creating means for creating a characteristic, and the color reproduction characteristic creating means includes a color reproduction characteristic of the first display device serving as a reference, and a colorimetric image used to create the color reproduction characteristic. And a white reference image which is a white image serving as a reference are displayed on the first display device, the colorimetric image and the white reference image are photographed by the photographing means, and the photographed colorimetric image. Is displayed on the display unit, and the color measurement image is displayed on the second display device to be measured, and the white reference image is displayed on the second display device. Display together with or the second display Displays in the second display unit different from the location, used when the color measurement image and the white reference images captured by the imaging means, and displays the color measurement image captured by the display unit A color information acquisition unit that acquires the second color information, a color reproduction characteristic of the first display device, and a color reproduction characteristic of the photographing unit based on the color reproduction characteristic of the first display device and the first color information. A color reproduction characteristic creating unit, and a second color reproduction characteristic creating unit that creates the color reproduction characteristic of the second display device based on the color reproduction characteristic of the photographing unit and the second color information. It is a color reproduction characteristic creation system characterized by comprising.
Invention of claim 5, wherein the color information acquiring unit, thereby acquiring the second color information obtained by both photographing by said photographing means the color measurement image and the white reference image The color reproduction characteristic creating system according to claim 4 .
According to the sixth aspect of the present invention, the computer displays the color reproduction characteristics of the first display device serving as a reference, the colorimetric image used to create the color reproduction characteristics, and a white image serving as a reference white image. The reference image is displayed on the first display device, the colorimetric image and the white reference image are captured by an imaging unit including a display unit capable of displaying the image, and the captured colorimetric image is captured. Is displayed on the display unit, and the color measurement image is displayed on the second display device to be measured, and the white reference image is displayed on the second display device. Displayed on a second display unit different from the second display device , the colorimetric image and the white reference image are photographed by the photographing means, and the photographed measurement Used when displaying a color image on the display. A second color information to obtain, a function to create a color reproduction characteristic of the photographing means based on the color reproduction characteristic of the first display device and the first color information, and the photographing And a function for creating a color reproduction characteristic of the second display device based on the color reproduction characteristic of the means and the second color information.
According to the seventh aspect of the present invention, the reference color reproduction characteristic acquisition stage for acquiring the color reproduction characteristic of the first display device as a reference, and the color measurement image and the reference used for creating the color reproduction characteristic are used. A first display stage for displaying a white reference image, which is a white image, on the first display device; and the colorimetric image and the white reference image displayed on the first display device, A first photographing stage for photographing by a photographing means having a display unit capable of displaying a photographed image, and a first used for displaying the colorimetric image photographed in the first photographing stage on the display unit. A first color information acquisition step for acquiring the color information of the image capturing means, a color reproduction characteristic of the first display device, and a first color for generating the color reproduction characteristic of the photographing means based on the first color information The reproduction characteristic creation stage and the color measurement image to be measured Together with displaying on the display device, the white reference image or together displayed on the second display device, or the second and the second display device for displaying in the second display portion to another A display stage, a second photographing stage for photographing the colorimetric image and the white reference image by the photographing means, and the display for displaying the colorimetric image photographed in the second photographing stage. Based on the second color information acquisition stage for acquiring the second color information to be used for the imaging, the color reproduction characteristics of the photographing means and the second color information, the color reproduction characteristics of the second display device are created. And a second color reproduction characteristic creating step. The color reproduction characteristic creating method comprising:
The invention according to claim 8 further includes an image adjustment step of performing an adjustment to display the white reference image on the second display device before the second display step. 7 is a method for creating color reproduction characteristics described in item 7 .

According to the first aspect of the present invention, it is possible to provide a color reproduction characteristic creation device in which the accuracy of the color reproduction characteristic is further improved as compared with the case where this configuration is not provided. Compared to the case without this configuration, the color reproduction characteristics can be created using a simpler device, or the white reference image displayed on the second display unit is used. The white balance of the photographing means can be adjusted.
According to the third aspect of the present invention, the second color information is corrected even when the white balance of the photographing unit is not appropriate, and the color reproduction characteristics are more accurately compared with the case where the present configuration is not provided. Can be created.
According to the invention of claim 4 , it is possible to provide a color reproduction characteristic creating system in which the accuracy of the color reproduction characteristic is further improved as compared with the case where the present configuration is not provided. Compared to the case without this configuration, the color reproduction characteristics can be created using a simpler device, or the white reference image displayed on the second display unit is used. The white balance of the photographing means can be adjusted.
According to the invention of claim 5 , the white balance of the photographing means can be adjusted using the white reference image displayed on the second display unit.
According to the sixth aspect of the present invention, it is possible to realize a function of improving the accuracy of the color reproduction characteristics by a computer as compared with the case where the present configuration is not provided. Compared to the case without this configuration, the color reproduction characteristics can be created using a simpler device, or the white reference image displayed on the second display unit is used. The white balance of the photographing means can be adjusted.
According to the seventh aspect of the present invention, it is possible to provide a color reproduction characteristic creating method in which the accuracy of the color reproduction characteristic is further improved as compared with the case where this configuration is not provided. Compared to the case without this configuration, the color reproduction characteristics can be created using a simpler device, or the white reference image displayed on the second display unit is used. The white balance of the photographing means can be adjusted.
According to the eighth aspect of the present invention, the white balance of the photographing means can be adjusted more appropriately than in the case where the present configuration is not provided.

(A)-(d) is the figure explaining the color reproduction characteristic preparation method in 1st Embodiment. 6 is a flowchart illustrating a color reproduction characteristic creation method according to the first embodiment. It is the figure which showed the relationship of the color value handled by FIG. 1, FIG. It is the figure which showed the function structural example of the portable terminal in 1st Embodiment. (A)-(d) is the figure explaining the color reproduction characteristic preparation method in 2nd Embodiment. 10 is a flowchart illustrating a color reproduction characteristic creation method according to the second embodiment. It is the figure which showed the function structural example of the portable terminal in 2nd Embodiment.

<Description of overall configuration of image display system>
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
For example, when a designer designs various products, a mock-up of the product to be designed may be created and checked when the product is actually manufactured. However, the mock-up generally tends to be expensive to produce, and has a problem that requires a lot of labor and time to produce.

  Therefore, in recent years, there are many cases where a product is designed by CG (Computer Graphics) using a PC (Personal Computer) or the like. In this case, the designer performs design by outputting an image of the product to a display device such as a small-sized liquid crystal display connected to a PC or the like. However, when the product is of a large size, it is difficult to capture the image of the entire product with a small-sized liquid crystal display. For example, a separate display device such as a large-sized liquid crystal display or projector is used. May output.

  Thus, when designing a product using CG, a plurality of display devices are often used. However, even if similar image data is used when output by a display device, the color reproduction characteristics (profiles) of the respective display devices are different. For this reason, an image output due to this is usually not the same color expression. Further, this color reproduction characteristic is different if the manufacturer or model number of the display device is different. Furthermore, even with the same model number of the same manufacturer, the color reproduction characteristics may be different due to variations in manufacturing and aging. When the color representations of the display devices are different, the designer cannot accurately grasp the color of the product, which causes trouble in designing.

Therefore, for example, in order to match the color expressions of a plurality of display devices, it is necessary to know the color reproduction characteristics of each display device. In order to measure the color reproduction characteristics, it is necessary to display a colorimetric image on a display device and measure the colorimetric image.
However, a colorimeter, which is a device that performs colorimetry, is generally expensive. Further, in order to measure the color reproduction characteristics, it is necessary to measure a large number of colorimetric images, so that it takes a lot of time to measure the color reproduction characteristics of one display device.

  Therefore, in the present embodiment, the following color reproduction characteristic creation method is used to measure the color reproduction characteristic of the display device, thereby suppressing this problem.

[First Embodiment]
As a color reproduction characteristic creation method of the present embodiment, the first embodiment will be described first.

  FIGS. 1A to 1D are views for explaining a color reproduction characteristic creation method according to the first embodiment. FIG. 2 is a flowchart illustrating the color reproduction characteristic creation method according to the first embodiment. Further, FIG. 3 is a diagram showing the relationship between the color values handled in FIGS. 1 and 2.

  As shown in FIGS. 1A to 1D, the present embodiment is an example of a display device 11 that is an example of a reference first display device and an example of a second display device that is a measurement target. A display device 12, and a mobile terminal (color reproduction characteristic creation system) 21 that takes an image displayed on the display screen 111 of the display device 11 and a display screen 121 of the display device 12 and measures the color reproduction characteristics of the display device 12. use.

  The display devices 11 and 12 are configured with 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 devices 11 and 12 is not limited to the liquid crystal method. In the example shown in FIGS. 1A to 1D, display screens 111 and 121 are provided in the display devices 11 and 12. However, when a projector is used as the display devices 11 and 12, for example, the display screen 111 is used. , 121 are screens or the like provided outside the display devices 11 and 12.

  The portable terminal 21 is an apparatus that includes a photographing unit such as a camera and further includes a display unit that can display an image photographed by the photographing unit. Specifically, a smart phone, a tablet, etc. can be illustrated.

FIG. 4 is a diagram illustrating a functional configuration example of the mobile terminal 21 according to the first embodiment.
As shown in the figure, the portable terminal 21 includes a photographing unit 21a and a color reproduction characteristic creating unit (color reproduction characteristic creating device) 21b that creates a color reproduction characteristic based on an image photographed by the photographing unit 21a.
The photographing unit 21a includes a photographing unit 211 and a display unit 212. The color reproduction characteristic creation unit 21b includes a color information acquisition unit 213, a reference color reproduction characteristic storage unit 214, and a first color reproduction characteristic creation unit. 215 and a second color reproduction characteristic creation unit 216.

The photographing unit 211 is a camera or the like and has a function of photographing an image. The imaging unit 211 includes an optical system (not shown) that converges light from the display screens 111 and 121 and an image sensor (not shown) that detects light converged by the optical system.
The optical system is configured by combining a single lens or a plurality of lenses, and the image sensor is configured by arranging a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), or the like.

  The display unit 212 can display the image captured by the image capturing unit 211 and is configured by a liquid crystal display or the like as with the display screens 111 and 121. Further, when the mobile terminal 21 is a smartphone or a tablet, the display unit 212 may be a capacitance type or pressure sensitive touch panel. In this case, the display unit 212 also functions as an input device for inputting a position on the display unit 212 by bringing a human finger or the like into contact therewith.

  The color information acquisition unit 213 acquires various color information, which will be described in detail later. For example, the color information acquisition unit 213 displays the color reproduction characteristics of the display device 11 and the color measurement image on the display screen 111 of the display device 11, and is obtained when the color measurement image is captured by the imaging unit 211. The first color information, the color measurement image, and the like are displayed on the display screen 121 of the display device 12, and the second color information obtained when the color measurement image is captured by the photographing unit 211 is acquired. To do.

  The reference color reproduction characteristic storage unit 214 stores the color reproduction characteristics of the reference display device 11 as will be described in detail later. Hereinafter, the color reproduction characteristics of the display device 11 may be referred to as “reference color reproduction characteristics”.

  The first color reproduction characteristic creating unit 215 creates the color reproduction characteristic of the portable terminal 21 based on the reference color reproduction characteristic and the first color information, which will be described in detail later.

  Although described in detail later, the second color reproduction characteristic creating unit 216 creates the color reproduction characteristic of the display device 12 based on the color reproduction characteristic of the photographing unit 21a and the second color information.

Hereinafter, the color reproduction characteristic creation method according to the present embodiment will be described with reference to FIGS.
First, the color information acquisition unit 213 of the portable terminal 21 refers to the reference color reproduction characteristic storage unit 214 and acquires the reference color reproduction characteristic (reference color reproduction characteristic acquisition step: step 101).

  Next, as shown in FIG. 1A, a colorimetric image S used for creating color reproduction characteristics is displayed on the display screen 111 of the display device 11 (first display step: step 102).

The display device 11 receives this input image data from a display PC (Personal Computer) (not shown) that creates image information (input image data) of the colorimetric image (color patch) S. Based on this input image data, the colorimetric image S is displayed on the display screen 111.
The display device 11 has already been measured for color reproduction characteristics. In this case, the display device 11 serves as a reference device for measuring the color reproduction characteristics of other display devices. That is, when the display device 11 receives R (red), G (green), and B (blue) color signals (R ₀ , G ₀ , B ₀ ) as input image data, the display device 11 displays them on the display screen 111. The colorimetric values (L ^* ₁ , a ^* ₁ , b ^* ₁ ) to be measured are previously measured by a colorimeter or the like. In other words, the display device 11 knows the color reproduction characteristics that are the relationship between the input image data and the displayed color value.

The colorimetric image S is a rectangular image having different color characteristics such as hue and saturation. In FIG. 1A, nine colorimetric images S are displayed on the display screen 111, but not only this but also other colorimetric images S are displayed on the display screen 111 sequentially. To go.
In the area where the colorimetric image S on the display screen 111 is not displayed, a white reference image W, which is a white image serving as a reference, is displayed as a background. The white reference image W is, for example, a white image at a predetermined color temperature.

  Next, as shown in FIG. 1B, the color measurement image S and the white reference image W displayed on the display device 11 are photographed using the photographing means 21a of the portable terminal 21 (first photographing stage). : Step 103).

Then, the photographed colorimetric image S is displayed on the display unit 212 of the portable terminal 21 (step 104).
Further, the color information acquisition unit 213 of the portable terminal 21 acquires first color information used when displaying the colorimetric image S photographed in step 103 on the display unit 212 (first color information acquisition stage: Step 105). The first color information is R, G, and B color signals, and is represented here as (R ′, G ′, B ′). That is, the color information acquisition unit 213 acquires (R ′, G ′, B ′) color signals that are output to display the image of the colorimetric image S captured by the display unit 212.

Next, the first color reproduction characteristic creating unit 215 of the portable terminal 21 creates the color reproduction characteristic of the photographing unit 21a based on the reference color reproduction characteristic and the first color information (first color reproduction characteristic creating stage). : Step 106). The color reproduction characteristic created here is the relationship of the first color information obtained when photographing the color values (L ^* ₁ , a ^* ₁ , b ^* ₁ ) of the colorimetric image S. That is, the relationship between (R ′, G ′, B ′) and (L ^* ₁ , a ^* ₁ , b ^* ₁ ) is created as the color reproduction characteristics of the photographing means 21a.
At this time, the colorimetric image S having some color value is displayed on the display unit 212. Regarding the color values (shown as (L ^* ′, a ^* ′, b ^* ′) in FIG. 3), In this embodiment, since it is not used, it is not necessary to perform measurement or the like.

Next, as shown in FIG. 1C, the white reference image W is displayed on the entire display unit 212 of the portable terminal 21 (step 107).
Then, as shown in FIG. 1C, a white image is displayed on the entire surface of the display screen 121 of the display device 12 to be measured, and the white reference image W is displayed by adjusting the image on the display screen 121. (Image adjustment stage: Step 108). This adjustment may be performed using a colorimeter. However, as described in detail later, it is not necessary to strictly adjust the white balance of the photographing means 21a.

  Next, as shown in FIG. 1D, the colorimetric image S is displayed on the display screen 121 of the display device 12 (second display stage: step 109). The displayed colorimetric image S is the same as that displayed on the display screen 111 of the display device 11 in step 102. In the present embodiment, as in the case of step 102, in the area where the colorimetric image S on the display screen 121 is not displayed, a white reference image W that is a reference white image is displayed as a background.

  And as shown in FIG.1 (d), the imaging | photography means 21a of the portable terminal 21 is used, and the image S for colorimetry and the white reference image W which are displayed on the display apparatus 12 are image | photographed (2nd imaging | photography stage: step). 110). That is, both the colorimetric image S and the white reference image W are photographed by the photographing means 21a.

Then, the image of the colorimetric image S is displayed on the display unit 212 of the portable terminal 21 (step 111).
Furthermore, the color information acquisition unit 213 of the portable terminal 21 acquires second color information used when the captured colorimetric image S is displayed on the display unit 212 (second color information acquisition step: step 112). . The second color information is R, G, and B color signals, and is expressed here as (R ″, G ″, B ″). That is, the color information acquisition unit 213 takes a picture with the display unit 212. A color signal (R ″, G ″, B ″) output to display the image of the colorimetric image S is acquired.
At this time, the colorimetric image S having a certain color value is displayed on the display unit 212. Regarding this color value (shown as (L ^* ", a ^* ", b ^* ") in FIG. 3). In this embodiment, since it is not used, it is not necessary to perform measurement or the like.

Next, the second color reproduction characteristic creating unit 216 of the portable terminal 21 obtains the color value of the colorimetric image S displayed on the display device 12 from the color reproduction characteristic of the photographing unit 21a and the second color information (step) 113). That is, in step 106, the relationship between (R ′, G ′, B ′) and (L ^* ₁ , a ^* ₁ , b ^* ₁ ) is created as the color reproduction characteristics of the photographing means 21a. By applying this relationship as it is, the second color information (R ″, G ″, B ″) and the color value of the colorimetric image S displayed on the display device 12 (here, (L ^* ₂ , a ^* ₂ , b ^* ₂ ))).

Then, the second color reproduction characteristic creating unit 216 creates the color reproduction characteristic of the display device 12 (second color reproduction characteristic creating stage: step 114). The input image data used when displaying the colorimetric image S on the display device 12 is (R ₀ , G ₀ , B ₀ ) as in the case of the display device 11. Then, when (R ₀ , G ₀ , B ₀ ) is received, the colorimetric values (L ^* ₂ , a ^* ₂ , b ^* ₂ ) displayed on the display screen 121 are obtained in step 113. Therefore, the color reproduction characteristic of the display device 12 which is the relationship between (R ₀ , G ₀ , B ₀ ) and (L ^* ₂ , a ^* ₂ , b ^* ₂ ) is obtained. As described above, in Step 113 to Step 114, the color reproduction characteristic of the display device 12 can be created based on the color reproduction characteristic of the photographing unit 21a and the second color information.

  According to the first embodiment described above, the color reproduction characteristics of the display device 12 can be created using an inexpensive portable terminal 21 such as a smartphone without using an expensive colorimeter. . In addition, since the color reproduction characteristics can be created simply by displaying a plurality of colorimetric images S on the display device 12 and photographing them, the color reproduction characteristics can be created more easily and in less time.

  Further, when the colorimetric image S is captured by the portable terminal 21, the white reference image W that is the same white image is captured together. As a result, the color reproduction characteristics of the display device 12 can be created with higher accuracy even in the portable terminal 21 having the photographing unit 21a in which the white balance automatic adjustment function cannot be turned off. That is, when the white balance automatic adjustment function cannot be turned off, the automatic adjustment function works in accordance with the object to be photographed, and the input / output characteristics of the photographing means 21a change. For this reason, it is difficult to accurately create the color reproduction characteristics of the display device 12 with the color reproduction characteristics of the photographing unit 21a created in advance. However, in this embodiment, when the colorimetric image S is captured, the white reference image W is captured together. Therefore, even if the automatic adjustment function is activated, the white balance is adjusted based on the white reference image W. Therefore, the above-described problem is unlikely to occur, and the color reproduction characteristics of the display device 12 can be created with high accuracy. Furthermore, the white reference image W is self-luminous, unlike a color chart such as a printed matter, and thus is not easily affected by illumination conditions during photographing. Therefore, there is no need to adjust the lighting conditions. Further, the photographing object is only the color measurement image S or the like displayed on the display device 11 or the display device 12, and it is not necessary to prepare a color chart that is a printed matter. Therefore, the measurement can be performed more easily.

  In the case of this embodiment, it is not necessary to shoot the display device 11 and the display device 12 side by side. That is, the display device 11 and the display device 12 may be in different places. That is, when the display device 11 and the display device 12 are in different places, the mobile terminal 21 is placed in the place of the display device 12 in order to create the color reproduction characteristics of the display device 12 after creating the color reproduction characteristics of the photographing means 21a. Take it to. Therefore, there is no problem even when the display device 12 is a device that is difficult to move or when it is in a remote place.

[Second Embodiment]
As a color reproduction characteristic creation method of the present embodiment, a second embodiment will be described first.

  FIGS. 5A to 5D are views for explaining a color reproduction characteristic creation method according to the second embodiment. FIG. 6 is a flowchart for explaining a color reproduction characteristic creation method according to the second embodiment. The relationship between the color values handled in FIGS. 5 and 6 is the same as that shown in FIG.

  As illustrated in FIGS. 5A to 5D, in this embodiment, a mobile terminal 22 is used in addition to the display device 11, the display device 12, and the mobile terminal 21.

  The mobile terminal 22 is an example of a device including a second display unit, and is a device having a display unit 222 that is an example of a second display unit that can display an image. Unlike the portable terminal 21, the portable terminal 22 does not need to have a photographing unit such as a camera. Specifically, a smart phone, a tablet, etc. can be illustrated.

FIG. 7 is a diagram illustrating a functional configuration example of the mobile terminal 21 according to the second embodiment.
As shown in the figure, the mobile terminal 21 of the present embodiment includes a photographing means 21a and a color reproduction characteristic creating means (color reproduction characteristic creating apparatus) 21b, similar to the mobile terminal 21 shown in FIG.
The configuration of the imaging unit 21 a is the same as that in the case of FIG. 4, and includes an imaging unit 211 and a display unit 212.
On the other hand, the color reproduction characteristic creating unit 21b includes the color information acquisition unit 213, the reference color reproduction characteristic storage unit 214, the first color reproduction characteristic creation unit 215, and the second color reproduction characteristic creation unit 216 shown in FIG. In addition, a determination unit 217 and a color information correction unit 218 are further provided.

  As will be described in detail later, the determination unit 217 determines whether the color value when the white reference image W included in the second color information is captured is within a predetermined range.

  Although described in detail later, the color information correction unit 218 corrects the second color information when the determination unit 217 determines that the color value is not within a predetermined range.

Hereinafter, the color reproduction characteristic creation method according to the present embodiment will be described with reference to FIGS. 3 and 5 to 7.
Here, the processing in steps 201 to 206 in FIG. 6 is the same as the processing in steps 101 to 106 in FIG. 5A to 5B are the same as FIGS. 1A to 1B. Therefore, in the description of FIG. 2, FIG. 1A is changed to FIG. FIG. 1B can be read as FIG. 5B.
Therefore, the description will be made from step 207.

Here, as shown in FIG. 5C, the white reference image W is displayed on the entire surface of the display screen 111 of the display device 11 (step 207).
And as shown in FIG.5 (c), a white image is displayed on the display part 222 whole surface of the portable terminal 22, and the image of the display part 222 is adjusted so that the white reference | standard image W can be displayed (step 208). ).

  Next, as shown in FIG. 5D, the colorimetric image S is displayed on the display screen 121 of the display device 12 (second display step: step 209). The colorimetric image S displayed at this time is the same as that displayed on the display screen 111 of the display device 11 in step 202, but the background of the colorimetric image S on the display screen 121 is not displayed. It is not necessary to display the white reference image W. Here, a black image B is displayed as a background.

  However, instead, in the present embodiment, the mobile terminal 22 that displays the white reference image W on the display unit 222 is arranged side by side with the display device 12 (step 210).

  Then, as shown in FIG. 5D, the photographing unit 21a of the portable terminal 21 is used to photograph the colorimetric image S displayed on the display device 12 (second photographing stage: step 211). At this time, the white reference image W of the portable terminal 22 arranged side by side with the display device 12 in step 210 is also taken. That is, in the present embodiment, the white reference image W is displayed on the display unit 222 different from the display device 12, and the colorimetric image S and the white reference image W are both photographed by the photographing means 21a. As a result, the white balance of the photographing means 21a is made appropriate.

Then, the image of the colorimetric image S is displayed on the display unit 212 of the portable terminal 21 (step 212).
Further, the color information acquisition unit 213 of the portable terminal 21 acquires second color information used when the captured colorimetric image S is displayed on the display unit 212 (second color information acquisition step: step 213). . That is, the processing of step 212 to step 213 is the same as the processing of step 111 to step 112, respectively.

  Next, in the present embodiment, the determination unit 217 determines whether the color value when the white reference image W displayed on the display unit 222 of the mobile terminal 22 is captured is within a predetermined range ( Step 214). This color value is included in the second color information and can be acquired as a part of the second color information, and becomes a color signal of (R ″, G ″, B ″).

When the color value is within a predetermined range (Yes in step 214), the processing after step 216 is performed.
On the other hand, when the determination unit 217 determines that the color value is not within the predetermined range (No in step 214), the second color information is corrected (step 215). That is, when the numerical values of the color values (R ″, G ″, B ″) when the white reference image W is photographed are not within a predetermined range, the values are set so that the numerical values are supposed to be originally taken. The entire color information of 2 is corrected.

Thereafter, the processing from step 216 to step 217 is the same as the processing from step 113 to step 114, respectively.
The color reproduction characteristics of the display device 12 can be created by the procedure as described above.

  According to the second embodiment described above, the image adjustment stage described in step 108 of the first embodiment is not required. In addition to the effects of the first embodiment described above, it can be confirmed whether the white balance of the photographing means 21a is appropriate. In other words, if the white balance set by the automatic adjustment function is appropriate, the color value when the white reference image W displayed on the display unit 222 of the mobile terminal 22 is captured by the photographing unit 21a is a predetermined range. Inside. On the other hand, when the white balance is not properly set, it is out of this range. Therefore, when the white balance is not properly set, the color reproduction characteristics can be created more accurately by correcting the second color information.

  In the example described in detail above, the photographing unit 21a and the color reproduction characteristic creating unit 21b are provided in the portable terminal 21, but they may be separate devices. In this case, the photographing unit 21a is, for example, a digital camera, and the color reproduction characteristic creating unit 21b can be, for example, a PC that obtains color information from a digital camera and creates color reproduction characteristics. In addition, the above-described smartphone, tablet, or the like may be used instead of a digital camera, and color information acquired by these devices may be sent to a PC to create color reproduction characteristics. In this case, a smartphone, a tablet, etc. bear only the function of the photographing means 21a.

  In the example described in detail above, the determination unit 217 and the color information correction unit 218 are used in the second embodiment, but may be applied to the first embodiment.

  The processing performed by the color reproduction characteristic creating unit 21b in the present embodiment described above is realized by cooperation between software and hardware resources. That is, a CPU (not shown) inside the control computer provided in the color reproduction characteristic creating unit 21b executes a program that realizes each function of the color reproduction characteristic creating unit 21b, and realizes each of these functions.

  Therefore, the processing performed by the color reproduction characteristic creating unit 21b is performed on the computer with the color reproduction characteristic of the display device 11 serving as a reference, the colorimetric image S used for creating the color reproduction characteristic, and the reference white image. A certain white reference image W is displayed on the display device 11, photographed by the photographing means 21a including the display unit 212 capable of displaying the image obtained by photographing the color measurement image S and the white reference image W, and the photographed color measurement image. First color information used when the image S is displayed on the display unit 212 and the colorimetric image S are displayed on the display device 12 to be measured, and the colorimetric image S and the white reference image W are captured. The function of acquiring the second color information used when the photographed color measurement image S is displayed on the display unit 212, the color reproduction characteristics of the display device 11, and the first color information. On the basis of the photographing means 21a And the ability to create a color reproduction characteristic on the basis of the color reproduction characteristic and the second color information of the imaging unit 21a, can be considered as a program for realizing a function of creating a color reproduction characteristic of the display device 12.

  The program for realizing the present embodiment can be provided not only by communication means but also by storing it in a recording medium such as a CD-ROM.

  Although the present embodiment has been described above, the technical scope of the present invention is not limited to the scope described in the above embodiment. It is clear from the description of the scope of the claims that various modifications or improvements added to the above embodiment are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 11, 12 ... Display apparatus, 21, 22 ... Portable terminal, 21a ... Imaging | photography means, 21b ... Color reproduction characteristic preparation means, 211 ... Imaging | photography part, 212 ... Display part, 213 ... Color information acquisition part, 214 ... Reference | standard color reproduction characteristic Storage unit, 215 ... first color reproduction characteristic creation unit, 216 ... second color reproduction characteristic creation unit, 217 ... determination unit, 218 ... color information correction unit

Claims (8)

The first display device displays the color reproduction characteristics of the reference first display device, the colorimetric image used to create the color reproduction characteristics, and the white reference image, which is a reference white image. The image is used for displaying the colorimetric image and the white reference image captured by a photographing unit having a display unit that can display the captured colorimetric image on the display unit. 1 color information and the color measurement image are displayed on the second display device to be measured, and the white reference image is displayed together on the second display device, or the second color image is displayed. When displaying on the second display unit different from the display device, photographing the colorimetric image and the white reference image by the photographing unit, and displaying the photographed colorimetric image on the display unit Second color information to be used, and color information acquisition to obtain And parts,
A first color reproduction characteristic creating unit that creates a color reproduction characteristic of the photographing unit based on the color reproduction characteristic of the first display device and the first color information;
A second color reproduction characteristic creating unit that creates a color reproduction characteristic of the second display device based on the color reproduction characteristic of the photographing unit and the second color information;
A color reproduction characteristic creating apparatus comprising: The color information acquiring unit, a color according to claim 1, characterized in that to obtain the second color information both obtained by photographing by the color measurement image and the white reference image the photographing means Reproduction characteristic creation device. A determination unit that determines whether a color value when the white reference image included in the second color information is captured is within a predetermined range;
A color information correction unit that corrects the second color information when the determination unit determines that the color value is not within a predetermined range;
Color reproduction quality creating apparatus according to claim 1 or 2, further comprising a. An imaging unit comprising: an imaging unit that captures an image; and a display unit that can display an image captured by the imaging unit;
Color reproduction characteristic creating means for creating color reproduction characteristics based on an image photographed by the photographing means;
With
The color reproduction characteristic creating means includes
The first display device displays the color reproduction characteristics of the reference first display device, the colorimetric image used to create the color reproduction characteristics, and the white reference image, which is a reference white image. First color information used for displaying the colorimetric image and the white reference image by the photographing unit, and displaying the photographed colorimetric image on the display unit, and the colorimetric image An image is displayed on the second display device to be measured, and the white reference image is displayed together on the second display device, or a second display different from the second display device. displays in part, the color measurement image and the white reference images captured by the imaging means, second color information using the color measurement images taken at the time to be displayed on the display unit, the A color information acquisition unit to acquire;
A first color reproduction characteristic creating unit that creates a color reproduction characteristic of the photographing unit based on the color reproduction characteristic of the first display device and the first color information;
A second color reproduction characteristic creating unit that creates a color reproduction characteristic of the second display device based on the color reproduction characteristic of the photographing unit and the second color information;
A color reproduction characteristic creation system characterized by comprising: The color information acquiring unit, a color according to claim 4, wherein obtaining said second color information both obtained by photographing by the color measurement image and the white reference image the photographing means Reproduction characteristics creation system. On the computer,
The first display device displays the color reproduction characteristics of the reference first display device, the colorimetric image used to create the color reproduction characteristics, and the white reference image, which is a reference white image. The image is used for displaying the colorimetric image and the white reference image captured by a photographing unit having a display unit that can display the captured colorimetric image on the display unit. 1 color information and the color measurement image are displayed on the second display device to be measured, and the white reference image is displayed together on the second display device, or the second color image is displayed. When displaying on the second display unit different from the display device, photographing the colorimetric image and the white reference image by the photographing unit, and displaying the photographed colorimetric image on the display unit A function of acquiring second color information to be used;
A function of creating color reproduction characteristics of the photographing means based on the color reproduction characteristics of the first display device and the first color information;
A function of creating the color reproduction characteristics of the second display device based on the color reproduction characteristics of the photographing means and the second color information;
A program that realizes A reference color reproduction characteristic acquisition stage for acquiring a color reproduction characteristic of the first display device as a reference;
A first display stage for displaying on the first display device a color measurement image used for creating the color reproduction characteristics and a white reference image which is a white image serving as a reference;
A first photographing step of photographing the colorimetric image and the white reference image displayed on the first display device by a photographing unit including a display unit capable of displaying the photographed image;
A first color information acquisition step of acquiring first color information used when displaying the colorimetric image captured in the first imaging step on the display unit;
A first color reproduction characteristic creating stage for creating a color reproduction characteristic of the photographing means based on the color reproduction characteristic of the first display device and the first color information;
The color measurement image is displayed on the second display device to be measured, and the white reference image is displayed together on the second display device, or different from the second display device. A second display stage for displaying on the second display unit ;
A second photographing stage for photographing the colorimetric image and the white reference image by the photographing means;
A second color information acquisition step of acquiring second color information used when displaying the colorimetric image captured in the second imaging step on the display unit;
A second color reproduction characteristic creating stage for creating a color reproduction characteristic of the second display device based on the color reproduction characteristic of the photographing means and the second color information;
A method for creating color reproduction characteristics, comprising: The color reproduction characteristic creating method according to claim 7 , further comprising an image adjustment step of performing an adjustment to display the white reference image on the second display device before the second display step. .

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