JP3601060B2 - Colorimetric data processing device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a colorimetric data processing device that displays an image of a colorimetric result obtained by measuring an object color.
[0002]
[Prior art]
In general, perceived colors whose properties differ due to differences in the color light energy distribution of light, and psychophysical colors defined as the characteristics of visible radiation whose properties differ due to differences in the color light energy distribution of light. are categorized.
[0003]
As the color system for displaying the psychophysical color, there are known an RGB color system and an XYZ color system of CIE (Commission Internationale de l'Eclairage: International Commission on Illumination) for displaying tristimulus values. . Further, the color system for displaying the perceived color includes a CIE L ^* a ^* b ^* color system based on a uniform perceived color space and a Munsell surface display system based on a perceptually uniform color scale. Color systems are widely known.
[0004]
Further, a color difference representing a perceptual difference between two perceived colors by a numerical value is quantitatively represented by a geometric distance between two points in a color space of the color system, and is represented by a color difference display in JIS Z8730, for example. As defined as a method, for example, the color difference ΔE ^* _ab in the L ^* a ^* b ^* color system is
ΔE ^* _ab = {(ΔL ^* ) ² + (Δa ^* ) ² (Δb ^* ) ² } ^1/2
Is calculated by Here, ΔL ^* , Δa ^* , and Δb ^* are differences between the lightness index L ^* and the chromaticity indices a ^* , b ^* of two object colors in the L ^* a ^* b ^* color system. The values of L ^* , a ^* , and b ^* are specified in JIS Z 8722 (method of measuring object color by 2 degree visual field XYZ system) or JIS Z 8727 (method of measuring object color by 10 degree visual field XYZ system). From the stimulus values X, Y, and Z,
_{^{L * = 116 (Y / Y}} n) 1/3 -16
a ^* = 500 ^{_{[(X / X n) 1/3 -}} (Y / Y n) 1/3 ]
b ^* = 200 ^{_{[(Y / Y n) 1/3 -}} (Z / Z n) 1/3 ]
Is calculated by Incidentally, the X, Y, Z are tristimulus values in the XYZ system, _also, X _n, Y n, is _{Z n} tristimulus values in the XYZ system of perfect diffuse reflection surface.
[0005]
[Problems to be solved by the invention]
By the way, in a colorimeter such as a photoelectric colorimeter for measuring an object color, a measured color value and a color difference (a spatial distance in a color space) are represented only by numerical values. For example, a color difference may be shifted to green or red. If the difference is the same, it will be the same value if it is the same, so it is difficult to know which direction in the color space it is deviating, and it is extremely difficult for a skilled person to image the actual color from the colorimetric values. there were.
[0006]
Further, when defining colors, the allowable range of the color difference differs for various purposes, and it is necessary to check and confirm the allowable range each time, and the operation is very complicated.
[0007]
In view of the above circumstances, an object of the present invention is to make it possible to easily recognize an object color measured by a colorimeter.
[0009]
Another object of the present invention is to provide a colorimetric data processing device that can easily determine whether or not colorimetric color data is within a color difference allowable range.
[0017]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a colorimetric data processing apparatus according to the present invention includes a data processing unit to which colorimetric color data is supplied, an operation unit that provides control data to the data processing unit, And an image display unit that displays a processing result by the unit.The data processing unit receives a designation operation of a display color space by an operation of the operation unit, and converts the color data as a graph on the designated display color space. Data processing for displaying on the image display unit together with the color difference allowable range is performed, and a determination process is performed as to whether or not the color data is within the color difference allowable range. It is characterized in that data processing for calculating the closest approximation value within the range and displaying the calculated value on the image display unit is performed.
[0018]
Also, the colorimetric data processing device according to the present invention displays a data processing unit to which the colorimetric data obtained by colorimetry is supplied, an operation unit for providing control data to the data processing unit, and a processing result by the data processing unit. An image display unit, wherein the data processing unit receives an operation of designating an allowable color difference range by operating the operation unit, and displays the color data together with the specified color difference allowable range as a graph in a color space on the image display unit. In addition to performing data processing for displaying the color data, a determination process is performed to determine whether or not the color data is within the color difference allowable range. For color data that is not within the color difference allowable range, the most approximate value within the color difference allowable range is calculated. It is characterized in that data processing for calculating and displaying on the image display unit is performed.
[0026]
[Action]
In the colorimetric data processing device according to the present invention, the data processing unit accepts a designation operation of the display color space, and displays the color data as a graph on the designated display color space together with the color difference allowable range on the image display unit. A determination process is performed to determine whether or not the color data is within the color difference allowable range. For color data that is not within the color difference allowable range, the closest approximation value within the color difference allowable range is calculated and displayed on the image display unit. Let it.
[0027]
Further, in the colorimetric data processing device according to the present invention, the data processing unit accepts the operation of specifying the color difference allowable range, and displays the color data together with the specified color difference allowable range on the image display unit as a graph in a color space. At the same time, a determination process is performed to determine whether the color data is within the color difference allowable range, and for color data that is not within the color difference allowable range, the closest approximation value within the color difference allowable range is calculated, and To be displayed.
[0035]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0036]
A colorimetric data processing device according to the present invention is configured, for example, as shown in FIG. The colorimetric data processing device is provided with a color value processing device 2 to which color data obtained by measuring an object color by a colorimeter 1 is supplied, and the color value processing device 2 performs predetermined processing on the color data. An image display device 3 to which the image data obtained by the application is supplied is provided. The color value processing device 2 includes a keyboard 4 and a mouse 5 as input operation means for inputting control data and the like, and an external storage device 6 that stores various data such as a color space and a color difference allowable range. It is connected.
[0037]
The colorimeter 1 measures the color of an object to be measured (sample) such as an industrial product including a color material or a color printed matter on which a synthesized image synthesized by an image processing device (not shown) is printed, and the measurement result is obtained. The obtained color data of each sample is supplied to the color value processing device 2.
[0038]
The color value processing device 2 includes, for example, as shown in FIG. 2, an input / output interface 11, a CPU 12, an input buffer memory 13, a ROM 14, an output buffer memory 15 and the like connected via a bus. The ROM 14 stores a control program for processing to be executed by the CPU 12, for example, a control program according to the processing procedure shown in FIG.
[0039]
Then, in the color value processing device 2, the color data obtained by measuring the object color by the colorimeter 1 is written to the input buffer memory 13 via the input / output interface 11. The CPU 12 performs a processing operation on the color data written in the input buffer memory 13 in accordance with the processing procedure shown in FIG.
[0040]
First, in step 1, for the color data written in the input buffer memory 13, an operation of selecting color data to be processed by operating the keyboard 4 or the mouse 5 is accepted.
[0041]
In step 2, an operation of designating a display space such as an RGB space, an XYZ space, an L ^* a ^* b ^* space, or a Munsell space by operating the keyboard 4 or the mouse 5 is performed on the color data selected in the above step 1. In response, the specified display space is set.
[0042]
Further, in the color value processing apparatus 2 of this embodiment, the processing on the change characteristic of the measured object color under an arbitrary light source is performed in steps 3 to 5.
[0043]
That is, in step 3, the selection operation of the light source data by the operation of the keyboard 4 and the mouse 5 is received, and the light source environment is set based on the selected light source data.
[0044]
In step 4, the change characteristic of the object color measured by the light source change is displayed according to the light source data selected in step 3 above.
[0045]
Further, in step 5, an operation for designating a display space of a change characteristic of an object color measured by a change in a light source by operating the keyboard 4 or the mouse 5 is received, and the designated display space is set.
[0046]
In step 6, a selection operation of two-dimensional display or three-dimensional display by operating the keyboard 4 or the mouse 5 is received in the display space specified in step 2 or step 5, and the specified two-dimensional display is received. The display or three-dimensional display is set.
[0047]
In step 7, the selection operation of the color display or the color difference display by the operation of the keyboard 4 or the mouse 5 is received. When the selection input of the color difference display is received, the process proceeds to step 8 , and the selection input of the color display is received. In this case, the process proceeds to step 14 described later.
[0048]
In step 8, the color data selected in step 1 is calculated and displayed in the display space designated in step 2 such as an RGB space as shown in FIG. Displays the color difference with respect to the reference color in space. That is, by displaying a sample point (color measured as the color data) A having coordinates of color values in the RGB space together with a reference point O indicating a reference color to be compared, the sample point A and the reference point are displayed. The color difference is represented as the distance from O. If the light source data is selected in step 3, the color value display and the color difference display are performed together with the change characteristic of the object color measured by the change of the light source according to the light source data.
[0049]
As described above, by displaying the color difference as a graph as the distance between the sample point A and the reference point O in the selected color space, the visibility of the change characteristic of the object color measured by the change in the color difference and the light source is improved. be able to.
[0050]
Further, in step 9, the operation of specifying the color difference allowable range by operating the keyboard 4 or the mouse 5 is received, and the designated color difference allowable range is set.
[0051]
In step 10, the color difference allowable range set in step 9 is displayed on the RGB space in which the color difference is displayed in step 8 as shown by the shaded area in FIG. Thus, by displaying the color difference allowable range on the color space in which the color difference is displayed, it is possible to visually determine whether or not the sample point is within the color difference allowable range.
[0052]
In step 11, it is determined whether or not the sample point falls within the color difference allowable range displayed on the RGB space in step 10 above. The determination result is "NO", that is, the sample point is in the color difference allowable range. If not, the process proceeds to step 12, and if the result of the determination is "YES", that is, if the sample point is within the color difference allowable range, the process proceeds to step 13.
[0053]
In step 12, a color value (closest value) closest to the sample point within the color difference allowable range displayed on the RGB space in step 10 is calculated. Then, the most approximate value is displayed, and as shown in FIG. 5, the most approximate point having the above-mentioned most approximate value as coordinates is displayed on the RGB space, and then the process proceeds to step S14.
[0054]
In step 13, an operation for specifying whether or not the reference color is changed by operating the keyboard 4 or the mouse 5 is received. When an operation for changing the reference color is received, the reference color is changed. When the operation without changing the reference color is received, the process proceeds to the next step.
[0055]
In step 14, when the selection input of the color display is received in step 7, the color data selected in step 1 is displayed as a pseudo display color as an image. In step 14, when the operation without changing the reference color is received in step 13, the pseudo display color of the sample point A determined to be in the color difference allowable range in step 10 is changed. The image is displayed together with the pseudo display color of the reference point O. Further, if it is determined in the step 11 that the sample point is not within the color difference allowable range, the pseudo display color of the closest point to the sample point A calculated in the step 12 is changed to the pseudo display color of the reference point O. The image is displayed together with the color.
[0056]
In this way, by displaying an image of the pseudo display color of the sample point A or the closest point B to the sample point A together with the pseudo display color of the reference point O as shown in FIG. 6, it is possible to visually confirm the color difference. it can.
[0057]
【The invention's effect】
As described above, in the colorimetric data processing device according to the present invention, a desired display color space is specified by the operation unit, and the color data is displayed on the image display unit together with the color difference allowable range as a graph on the display color space. The user can easily determine whether the color data is within a color difference allowable range on a desired display color space based on the display content of the image display unit, and Can be immediately determined. Moreover, in this colorimetric data processing device, the data processing unit can quantitatively determine whether or not the measured color data is within the color difference allowable range. Since the closest approximation value within the color difference allowable range is calculated and displayed on the image display unit, the user can change the characteristic of the object color measured by the change of the light source based on the display content of the image display unit. While taking into account, it is possible to easily recognize the color within the color difference allowable range closest to the color of the sample indicated by the color data.
[0058]
Further, in the colorimetric data processing device according to the present invention, a desired color difference allowable range is designated by the operation unit, and the color data together with the color difference allowable range can be displayed as a graph in a color space on the image display unit. The user can easily determine whether or not the color data is within a desired color difference allowable range based on the display content of the image display unit, and also immediately determines the direction of color shift. Will be able to do it. Moreover, in this colorimetric data processing device, the data processing unit can quantitatively determine whether or not the measured color data is within the color difference allowable range. Since the closest approximation value within the color difference allowable range is calculated and displayed on the image display unit, the user can change the characteristic of the object color measured by the change of the light source based on the display content of the image display unit. While taking into account, it is possible to easily recognize the color within the color difference allowable range closest to the color of the sample indicated by the color data.
[0060]
Furthermore, in the colorimetric data processing device according to the present invention, by displaying the color data together with the reference color as a pseudo display color on the image display unit, the user can generate a pseudo color based on the display content of the image display unit. Although it is a display color, the color of the sample can be easily compared with the reference color.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a colorimetric data processing device according to the present invention.
FIG. 2 is a block diagram showing a configuration of a color value processing device in the colorimetric data processing device.
FIG. 3 is a flowchart showing a procedure for processing color data in the colorimetric data processing device.
FIG. 4 is a diagram showing an example of display contents of an image display device in the colorimetric data processing device.
FIG. 5 is a diagram showing another example of the display content of the image display device in the colorimetric data processing device.
FIG. 6 is a diagram showing still another example of the display content of the image display device in the colorimetric data processing device.
[Explanation of symbols]
1 ... Colorimeter 2 ... Color value processing device 3 ... Image display device 4 ... Keyboard 5 ... ... Mouse 6 ... External storage device

Claims (4)

A data processing unit to which the measured color data is supplied;
An operation unit for providing control data to the data processing unit;
An image display unit that displays a processing result by the data processing unit,
The data processing unit receives a designation operation of a display color space by an operation of the operation unit, and performs a data process of displaying the color data on the image display unit together with a color difference allowable range as a graph on the designated display color space. Performing a judgment process as to whether or not the color data is within the color difference allowable range, and calculating the closest approximation value within the color difference allowable range for the color data that is not within the color difference allowable range. A colorimetric data processing device for performing data processing to be displayed on a section. 2. The colorimetric data processing device according to claim 1, wherein the data processing unit performs data processing for displaying the color data together with a reference color as a pseudo display color on the image display unit. A data processing unit to which the measured color data is supplied;
An operation unit for providing control data to the data processing unit;
An image display unit that displays a processing result by the data processing unit,
The data processing unit receives a designation operation of a color difference allowable range by an operation of the operation unit, and performs a data process of displaying the color data together with the designated color difference allowable range on the image display unit as a graph in a color space. At the same time, a determination process is performed to determine whether or not the color data is within the color difference allowable range. For color data that is not within the color difference allowable range, a closest approximation value within the color difference allowable range is calculated, and the image display unit is operated. A colorimetric data processing device for performing data processing for displaying on a colorimetric data. 4. The colorimetric data processing device according to claim 3, wherein the data processing unit performs data processing for displaying the color data together with a reference color as a pseudo display color on the image display unit.

Images