JP2018050142A - Index display device and index display program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intelligibly display a color difference of a display image compared with a case where a parameter expressing the color of display image is directly shown.SOLUTION: An index display device comprises: an acquisition part 51 that acquires a first measurement color value and a second measurement color value as a measurement color value of two image display devices including one image display device at different two periods of the lapse of time; a calculation part 52 that calculates a first index value that is a representation of white displayed in the two image display devices on the basis of the first and second measurement color values, and a second index value that is a representation of a color displayed in the two image display devices; and a display part 53 that displays a coordinate point formed by the first and second index values calculated on two image display devices onto a binary chart indicated by a first axis in which the first index value is set a variable number and a second axis in which the second index value is set the variable number.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an index display device and an index display program.

  2. Description of the Related Art Conventionally, so-called color management has been performed in which the color of an image displayed on a display for a personal computer (hereinafter abbreviated as “PC”) is calibrated. In this color management, in general, the input data of the display is changed variously to display images of various colors on the display, the images of the various colors are measured with a colorimeter, and the display is used. A color profile for converting input data so that an image of a desired color is displayed is created. Then, when checking the accuracy of the created color profile, each value is compared with the target value for the parameters that represent the color of the display image, such as “luminance” or “brightness”, “color temperature”, “color difference”, etc. And how much difference there is.

  Patent Document 1 proposes adjusting the color temperature of the monitor by adjusting the position of the pointer on the xy chromaticity diagram displayed on the color temperature adjusting device.

JP 2011-091690 A

  Here, after shipping a display in which color management is correctly performed, the color of the display image of the display changes over time, and it is determined whether or not color calibration (color management) needs to be performed again. Consider the scene.

  Color management performed before shipment is performed by a person on the manufacturer side who has specialized knowledge. On the other hand, whether or not the color of the display image has changed is determined by a general user. In order to determine whether the color of the display image has changed, the values of parameters such as “luminance” or “brightness”, “color temperature”, “color difference” described above are obtained by colorimetry and compared with the target value. However, for general users who may be lacking in specialized knowledge of color management, how much difference can be said to be small in color change over time, or whether color has changed greatly over time? There is a problem that it is difficult to judge.

  Here, the change with time of one display is taken up, but it is not a single display at two different points in time, but whether the colors of the display images of the two displays are sufficiently matched. When the monitor standard color space represented by sRGB Color Space (IEC 61966-2-1) is set on one display, the color actually displayed on the display is sufficiently A similar problem may occur even when determining whether or not the color matches the standard color.

  In addition, here, a display for a PC is taken up and described. However, the above problem is not limited to the one for a PC, but applies to all displays. Furthermore, the problem is not limited to a display, but is a problem that applies to image display devices in general, such as whether or not the color of an image projected by a projector and the image displayed on a local display match.

  The present invention has been made in view of the above circumstances, and provides an index display device and an index display program for easily displaying a difference in color of a display image in comparison with a case where a parameter expressing the color of a display image is directly presented. And

Claim 1
Acquisition of acquiring a first colorimetric value and a second colorimetric value, which are colorimetric values of two image display devices, including one image display device at two different points in time And
Based on the first color measurement value and the second color measurement value, the first index value representing white displayed on each of the two image display devices and the two image display devices. A calculation unit for calculating a second index value representing the color color displayed on each of them;
Calculations are made for each of the two image display devices on a two-dimensional chart represented by a first axis having the first index value as a variable and a second axis having the second index value as a variable. An index display device comprising: a display unit that displays coordinate points including the first index value and the second index value.

Claim 2
2. The index display device according to claim 1, wherein the display unit further displays an allowable error range of color reproduction of the two image display devices on the two-dimensional chart.

Claim 3
The first image display device when the calculation unit applies the white colorimetric value of the first image display device to both the first image display device and the second image display device; and The color difference with the second image display device is used as the first index value. For the first image display device, the colorimetric value of white of the first image display device is applied and the color difference is applied. For the second image display device, the color difference between the first image display device and the second image display device when the white colorimetric value of the second image display device is applied is determined as the second image display device. The index display device according to claim 1, wherein an index value of 2 is used.

Claim 4
The first image display device when the calculation unit applies the white colorimetric value of the first image display device to both the first image display device and the second image display device; and The color difference with the second image display device is used as the first index value. For the first image display device, the colorimetric value of white of the first image display device is applied and the color difference is applied. For the second image display device, the color difference of a specific color between the first image display device and the second image display device when the white colorimetric value of the second image display device is applied The index display device according to claim 1, wherein the index value is the second index value.

Claim 5
The calculation unit, wherein white brightness is used as the first index value, and a function value including X and Z in the XYZ color system as variables is used as the second index value. The index display device according to 1 or 2.

Claim 6
The index display device according to claim 5, wherein the function value is a value of a function including X / Z or Z / X.

Claim 7
The calculation unit uses the lightness of each of the first image display device and the second image display device when the lightness of the first image display device is used as a reference as the first index value, and The first color display value of the first image display device is applied to the first image display device, and the white color measurement value of the second image display device is applied to the second image display device. 3. The index display device according to claim 1, wherein a color difference between the first image display device and the second image display device at the time is set as the second index value. .

Claim 8
An acquisition unit for acquiring a reference value to be set for one image display device and a colorimetric value of the image display device after the reference value is set;
Based on the reference value and the colorimetric value, a first index value representing white displayed on the image display device and a second index value representing color color displayed on the image display device. A calculation unit for calculating,
A first index calculated for the image display device on a two-dimensional chart represented by a first axis having the first index value as a variable and a second axis having the second index value as a variable. An index display device comprising: a display unit that displays a coordinate point composed of a value and a second index value.
Claim 9
The information processing apparatus is executed in an information processing apparatus that executes a program.
Acquisition of acquiring a first colorimetric value and a second colorimetric value, which are colorimetric values of two image display devices, including one image display device at two different points in time And
Based on the first color measurement value and the second color measurement value, the first index value representing white displayed on each of the two image display devices and the two image display devices. A calculation unit for calculating a second index value representing the color color displayed on each of them;
Calculations are made for each of the two image display devices on a two-dimensional chart represented by a first axis having the first index value as a variable and a second axis having the second index value as a variable. An index display program that operates as an index display device including a display unit that displays coordinate points including the first index value and the second index value.

  According to the index display device of claims 1 and 8 and the index display program of claim 9, the first index value representing white and the second index value representing color are calculated, and the image display apparatus Since the color state of the display image is displayed as a coordinate point on the two-dimensional chart, the difference in the color of the display image is displayed in an easy-to-understand manner compared to the case where the parameter expressing the color of the display image is directly presented.

  According to the indicator display device of the second aspect, it is possible to easily know the general allowable limit as compared with the case where the allowable error range is not displayed.

  Claims 3 to 7 are claims showing a specific method for calculating the first index value and the second index value, as compared with the case of directly presenting the parameter expressing the color of the display image. The difference in color of the display image is displayed in an easy-to-understand manner.

It is a schematic diagram of a colorimetric / index display system. It is a conceptual diagram of XYZ data. It is the figure which showed the flowchart of the parameter | index display program. It is a block diagram of an index display device. FIG. 5 is a diagram illustrating an example of a two-dimensional chart in which “color difference (relative)” is the vertical axis and “color difference (absolute)” is the horizontal axis. FIG. 5 is a diagram illustrating an example of a two-dimensional chart in which “color difference (relative)” is a vertical axis and “red color difference (absolute)” is a horizontal axis. It is the figure which showed an example in the two-dimensional chart which makes the brightness | luminance Yw the vertical axis | shaft and makes the color balance Xw / Zw the horizontal axis. It is the figure which showed the two-dimensional chart which made lightness (relative) the vertical axis and made "color difference (absolute)" the horizontal axis.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic diagram of a colorimetric / index display system.

  The color measurement / index display system 100 includes a monitor 10 for color measurement, a colorimeter 20, and a PC 30.

  Here, the display screen 11 of the monitor 10 is measured by the colorimeter 20 regularly or irregularly.

  When the color of the display screen 11 of the monitor 10 is measured, RGB data composed of data for three colors R (red), G (green), and B (blue) is converted into R, G, and B from a device (not shown). Each value is input to the monitor 10 and the PC 30 while being sequentially changed within a range of R, G, B = 0 to 255. Then, the display color of the display screen 11 of the monitor 10 is sequentially changed to a color corresponding to the RGB data input to the monitor 10. The colorimeter 20 measures the sequentially changing colors and outputs colorimetric data. The colorimeter 20 used here is, for example, a colorimeter that outputs colorimetric data based on the XYZ color system.

  There are colorimeters that output colorimetric data based on color systems other than the XYZ color system, such as the L * a * b * color system, but these color systems are unambiguous. In this example, it is assumed that a colorimeter that outputs colorimetric data compliant with the XYZ color system is used. Thereafter, the color measurement data output from the colorimeter 20 is referred to as XYZ data.

  The XYZ data sequentially output from the colorimeter 20 is input to the PC 30 in synchronization with the change in RGB data, and a pair of RGB data and XYZ data is stored in the PC 30.

  Here, it has been described that RGB data is output from a device (not shown) and input to the monitor 10 and the PC 30. However, the PC 30 serves as the RGB data output source and inputs the RGB data output from the PC 30 to the monitor 10. It is good.

  FIG. 2 is a conceptual diagram of XYZ data.

  The XYZ data 1 which is one of the XYZ data 1 and the XYZ data 2 shown in FIG. 2 is the initial data obtained from the monitor 10, and here, the XYZ data 1 is used as a reference, and thereafter It is examined how the color reproduced on the display screen 11 of the monitor 10 changes with time. The XYZ data 2 representatively shows data at a certain point in time after the monitor 10 is obtained.

  Here, in order to distinguish the XYZ data 1 and the XYZ data 2 from each other, the XYZ data 1 is indicated by a subscript “1”, and the XYZ data 2 is indicated by a subscript “2”. Show. In either XYZ data 1 or XYZ data 2, XYZ data corresponding to RGB data having a value other than “255” in any one of R, G, B is “data other than white”. XYZ data corresponding to RGB data in which all of R, G, and B have a value of “255” is “white data”. Therefore, here, the white XYZ data is shown with the suffix “w”.

  FIG. 3 is a diagram showing a flowchart of the index display program as one embodiment of the present invention.

  This index display program is executed in the PC 30 shown in FIG. The PC 30 operates as an index display device as an embodiment of the present invention by executing this index display program.

  This index display program includes an acquisition step S41, a calculation step S42, and a display step S43. The index display program will not be described here, but an index display device described later with reference to FIG. 4 will be described to serve as an explanation of the index display program.

  FIG. 4 is a block diagram of the index display device.

  When the index display program shown in FIG. 3 is executed in the PC 30 shown in FIG. 1, an index display device having the function shown in FIG. 4 is constructed in the PC 30.

  The index display device 50 shown in FIG. 4 includes an acquisition unit 51, a calculation unit 52, and a display unit 53.

  The acquisition unit 51 is a function realized by executing the index display program acquisition step S41 in the PC 30. As described with reference to FIGS. 1 and 2, the acquisition unit 51 acquires the XYZ data 1 and the XYZ data 2 of the monitor 10 at two different points in time.

  The calculation unit 52 is a function realized by executing the index display program calculation step S42 in the PC 30. Based on the acquired XYZ data 1 and XYZ data 2, the calculation unit 52 displays the first index value representing white at each of the two time points displayed on the monitor 10 and the color color at each of the two time points. A representative second index value is calculated.

  Further, the display unit 53 is a function realized by executing the display step S43 of the index display program in the PC 30. The display unit 53 is represented by a first axis having a first index value as a variable (vertical axis here) and a second axis having a second index value as a variable (here horizontal axis) 2. On the dimensional diagram, an image showing the coordinate point composed of the first index value and the second index value calculated for each of the two time points of the monitor 10 is generated and displayed on the display screen 31 of the PC 30. .

  Here, the display unit 53 further displays an allowable error range of color reproduction of the monitor 10 on the two-dimensional chart.

Hereinafter, specific examples of the index display device 50 will be described.
(First example)
In this first example, the calculation unit 52 (see FIG. 4) converts the white data (X1w / Y1w / Z1w) of the XYZ data 1 at the time of obtaining the monitor 10 into both the XYZ data 1 and the XYZ data 2 after the passage of time. The color difference between the XYZ data 1 and the XYZ data 2 when applied is “color difference (relative)” which is an example of a first index value representing white. In the first example, the white data (X1w / Y1w / Z1w) of the XYZ data 1 is applied to the XYZ data 1, and the white data (X2w / Y2w / of the XYZ data 2 is applied to the XYZ data 2). The color difference between the XYZ data 1 and the XYZ data 2 when Z2w) is applied is “color difference (absolute)” which is an example of a second index value representing a color color.

  Specifically, it is as follows.

  In the case of this first example, conversion from the XYZ color system to the L * a * b * color system is performed using the following two conversion formulas. One of them is a conversion formula that uses white data of XYZ data 1, that is, X1w / Y1w / Z1w, for both XYZ data 1 and XYZ data 2 (see FIG. 2).

であり、ＸＹＺデータ２に関しては、

である。 That is, for XYZ data 1,

For XYZ data 2,

It is.

  Another of the two conversion formulas is a conversion formula using white data of XYZ data 1 and XYZ data 2.

であり、ＸＹＺデータ２に関しては、上記式（２）とは異なり、

である。 That is, for XYZ data 1, as in the above equation (1),

For XYZ data 2, unlike the above formula (2),

It is.

  After such conversion, the color difference between the above formulas (1) and (2) and the color difference between the above formulas (3) and (4) are further calculated. Here, the color difference between the expressions (1) and (2) is referred to as “color difference (relative)”, and the color difference between the expressions (3) and (4) is referred to as “color difference (absolute)”. .

により算出され、「色差（絶対）」は、上記式（３）と式（４）とを用いて、式

により算出される。 That is, the “color difference (relative)” is calculated using the above formula (1) and formula (2).

The “color difference (absolute)” is calculated using the above equation (3) and equation (4).

Is calculated by

  However, X1 / Y1 / Z1 and X2 / Y2 / Z2 are variables that change as the RGB data changes. Therefore, although abbreviated as equations (5) and (6) here, an average color difference in the entire color gamut is calculated as “color difference (relative)” and “color difference (absolute)”. The same applies to the following.

After obtaining “color difference (relative)” and “color difference (absolute)” in this way, a two-dimensional chart with “color difference (relative)” on the vertical axis and “color difference (absolute)” on the horizontal axis. above,
Coordinate point = (color difference (relative), color difference (absolute))
Is displayed.

  FIG. 5 is a diagram illustrating an example of a two-dimensional chart in which “color difference (relative)” is the vertical axis and “color difference (absolute)” is the horizontal axis. Here, the two-dimensional chart shown in FIG. 5 is displayed on the display screen of the PC 30 (see FIG. 1).

Here, in the color measurement when the monitor 10 is obtained,
X1w / Y1w / Z1w = X2w / Y2w / Z2w
And for all data other than white,
X1 / Y1 / Z1 = X2 / Y2 / Z2
It is. For this reason, the coordinate point at the time of obtaining the monitor 10 is
Coordinate point = (color difference (relative), color difference (absolute)) = (0, 0)
It is. That is, the origin O of the two axes of the two-dimensional chart.

  The vertical axis of the two-dimensional chart shown in FIG. 5 uses white data (X1w / Y1w / Z1w) of XYZ data 1 in the conversion of both XYZ data 1 and XYZ data 2. Therefore, when “lightness” or “luminance” or “color temperature” changes, “color difference (relative)” changes sensitively from the origin O to the coordinate points A and B as shown in FIG. That is, this “color difference (relative)” is one of index values representing white.

  The horizontal axis of the two-dimensional chart shown in FIG. 5 represents the white data (X1w / Y1w / Z1w), (X2w /) of the XYZ data 1 and the XYZ data 2 in the conversion of the XYZ data 1 and the XYZ data 2, respectively. Y2w / Z2w) is used.

For white on the display screen, objectively,
(X1w / Y1w / Z1w) ≠ (X2w / Y2w / Z2w)
Even so, unless the two display screens are compared at the same time, the human eye will adapt and feel the same white. For this reason, for color colors such as blue and red, the relative color from white when viewed with the adapted eyes becomes a problem. Therefore, here, “color difference (absolute)” is used as one index value representing a color color. That is, when the color color such as blue or red changes, like the coordinate point C, “color difference (absolute)” changes sensitively.

  The coordinate point D represents that “brightness” or “luminance” or “color temperature” changes, and color colors such as blue and red also change.

  Further, a frame F is shown in the two-dimensional chart of FIG. This frame F indicates an allowable error range of color reproduction of the monitor 10 (see FIG. 1). That is, when the coordinate point obtained by the latest colorimetry is inside the frame F, it means that the monitor 10 maintains sufficient color reproducibility.

の色再現域全域の平均値を採用してもよい。あるいは、縦軸を、明度Ｌ＊とともに色温度を加味した変数の軸としてもよい。 Here, since “color difference (relative)” on the vertical axis is an index value representing white, instead of the above equation (5), the above equation (1) and equation (2) are used.

The average value of the entire color gamut may be adopted. Alternatively, the vertical axis may be a variable axis in consideration of the color temperature together with the lightness L *.

の色再現域全域の平均値を採用してもよい。
（第２例）
この第２例の場合、算出部５２（図４参照）において、モニタ１０の入手時のＸＹＺデータ１の白データ（Ｘ１ｗ／Ｙ１ｗ／Ｚ１ｗ）をそのＸＹＺデータ１と経時後のＸＹＺデータ２の双方に適用したときのＸＹＺデータ１とＸＹＺデータ２との間の色差が、第１の指標値の一例である「色差（相対）」とされる。この「色差（相対）」については、上述の第１例の場合と同様である。また、この第２例では、さらに、ＸＹＺデータ１についてはそのＸＹＺデータ１の白データ（Ｘ１ｗ／Ｙ１ｗ／Ｚ１ｗ）を適用するとともにＸＹＺデータ２についてはそのＸＹＺデータ２の白データ（Ｘ２ｗ／Ｙ２ｗ／Ｚ２ｗ）を適用したときのＸＹＺデータ１とＸＹＺデータ２との間の「特定の色の色差」が、第２の指標値の一例である「特定の色の色差（絶対）」とされる。 Similarly, since the “color difference (absolute)” on the horizontal axis is an index value representing a color color, the above formulas (3) and (4) are replaced with the above formula (6). make use of,

The average value of the entire color gamut may be adopted.
(Second example)
In the case of this second example, in the calculation unit 52 (see FIG. 4), the white data (X1w / Y1w / Z1w) of the XYZ data 1 at the time of obtaining the monitor 10 is converted into both the XYZ data 1 and the XYZ data 2 after the lapse of time. The color difference between the XYZ data 1 and the XYZ data 2 when applied to is “color difference (relative)” which is an example of the first index value. This “color difference (relative)” is the same as in the case of the first example. In the second example, the XYZ data 1 is applied with the white data (X1w / Y1w / Z1w) of the XYZ data 1 and the XYZ data 2 is white data (X2w / Y2w / “Color difference of specific color” between XYZ data 1 and XYZ data 2 when Z2w) is applied is “color difference (absolute) of specific color” which is an example of the second index value.

  Specifically, it is as follows. Here, “red color difference (absolute)” will be described as an example of “specific color difference (absolute)”. “Green color difference (absolute)” and “blue color difference (absolute)” are also calculated in the same manner as “red color difference (absolute)”.

  Also in the case of the second example, the conversion from the XYZ color system to the L * a * b * color system is performed using the following two conversion formulas as in the first example. One of them is the same conversion formula as that used in the first example described above. For both XYZ data 1 and XYZ data 2 (see FIG. 2), white data of XYZ data 1, that is, It is a conversion formula using X1w / Y1w / Z1w.

であり、ＸＹＺデータ２に関しては、

である。 That is, for XYZ data 1,

For XYZ data 2,

It is.

  Another of the two conversion formulas is a conversion formula using white data of XYZ data 1 and XYZ data 2. The point that each white data is used is the same as the first example described above, but here, as data other than white (X1 / Y1 / Z1) and (X2 / Y2 / Z2), data in the red region ( Only X1R / Y1R / Z1R), (X2R / Y2R / Z2R) are used. In the present embodiment, the red area data (X1R / Y1R / Z1R) and (X2R / Y2R / Z2R) are RGB data which is an input signal to the monitor 10, R = 0 to 255, G = B = 0. Is a set of XYZ data corresponding to.

であり、ＸＹＺデータ２に関しては、

である。 Here, regarding XYZ data 1,

For XYZ data 2,

It is.

  After such conversion, the color difference between the above formulas (7) and (8) and the color difference between the above formulas (9) and (10) are calculated. Here, the color difference between the formula (7) and the formula (8) is referred to as “color difference (relative)” as in the first example, and the color difference between the formula (9) and the formula (10). Is referred to as “red color difference (absolute)”.

により算出され、「赤の色差（絶対）」は、上記式（９）と式（１０）とを用いて、式

により算出される。 That is, the “color difference (relative)” is calculated using the above formula (7) and formula (8).

The “red color difference (absolute)” is calculated using the above equation (9) and equation (10).

Is calculated by

  However, X1 / Y1 / Z1 and X2 / Y2 / Z2 are variables that change as the RGB data changes. Therefore, here, “color difference (relative)” is abbreviated as shown in Expression (11), but as “color difference (relative)”, an average color difference in the entire color gamut is calculated. Similarly, the XYZ data (X1R / Y1R / Z1R) and (X2R / Y2R / Z2R) of the red region are XYZ data in the range corresponding to R = 0 to 255 and G = B = 0. As the “red color difference (absolute)” which is a set, an average color difference within the range is calculated. The same applies to the following.

Thus, after obtaining these “color difference (relative)” and “red color difference (absolute)”, the “color difference (relative)” is the vertical axis, and the “red color difference (absolute)” is the horizontal axis. On the 2D chart
Coordinate point = (color difference (relative), red color difference (absolute))
Is displayed.

  FIG. 6 is a diagram showing an example of a two-dimensional chart having “color difference (relative)” on the vertical axis and “red color difference (absolute)” on the horizontal axis. Here, the two-dimensional chart shown in FIG. 6 is displayed on the display screen of the PC 30 (see FIG. 1).

Here, as described in the first example, in the color measurement at the time of obtaining the monitor 10,
X1w / Y1w / Z1w = X2w / Y2w / Z2w
And for all data other than white,
X1 / Y1 / Z1 = X2 / Y2 / Z2
It is. For this reason, the coordinate point at the time of obtaining the monitor 10 is
Coordinate point = (color difference (relative), red color difference (absolute)) = (0, 0)
It is. That is, the origin of the two axes of the two-dimensional chart.

  The white data (X1w / Y1w / Z1w) of the XYZ data 1 is used for the conversion of both the XYZ data 1 and the XYZ data 2 on the vertical axis of the two-dimensional chart shown in FIG. For this reason, when “brightness” or “luminance” or “color temperature” changes, “color difference (relative)” changes sensitively from the origin O to the coordinate points A and B. Therefore, this “color difference (relative)” is one of index values representing white. Further, the horizontal axis of the two-dimensional chart shown in FIG. 6 represents the white data (X1w / Y1w / Z1w), (X2w /) of the XYZ data 1 and the XYZ data 2 in the conversion of the XYZ data 1 and the XYZ data 2, respectively. Y2w / Z2w) is used. For the horizontal axis, only red XYZ data is used. For this reason, if red changes when viewed with an adapted eye for white, like the coordinate point C, “red color difference (absolute)” changes sensitively. Therefore, this “red color difference (absolute)” is one of the index values representing the color color. The coordinate point D represents that “lightness”, “luminance”, and “color temperature” change, and red also changes. Here, since the horizontal axis is “red color difference (absolute)”, the change in red appears more sensitively on the two-dimensional chart than in the first example.

  Further, a frame F is shown in the two-dimensional chart of FIG. This frame F indicates the allowable error range of color reproduction of the monitor 10 (see FIG. 1), as in the case of the first example described above. That is, when the coordinate point obtained by the latest colorimetry is inside the frame F, it means that the monitor 10 maintains sufficient color reproducibility. However, since only red is evaluated for the color color here, it is unclear from the two-dimensional chart shown in FIG. 6 whether sufficient color reproducibility is maintained for green and blue.

  When evaluating color reproducibility for green and blue, calculate “green color difference (absolute)” and “blue color difference (absolute)” in the same way as above, and create a two-dimensional chart similar to FIG. To do. This makes it possible to know whether or not sufficient color reproducibility is maintained for green and blue.

の色再現域全域の平均値を採用してもよい。あるいは、縦軸を、明度Ｌ＊とともに白の色温度を加味した変数の軸としてもよい。 Also, similarly to the above-described first example, the “color difference (relative)” on the vertical axis is obtained by using Equations (7) and (8) instead of Equation (11).

The average value of the entire color gamut may be adopted. Alternatively, the vertical axis may be a variable axis that takes into account the lightness L * and the white color temperature.

の赤の領域内の平均値を採用してもよい。 Similarly, the “red color difference (absolute)” on the horizontal axis is obtained by using the formulas (9) and (10) instead of the above formula (12).

The average value in the red region may be adopted.

Here, the XYZ data in which the XYZ data corresponding to the range of R = 0 to 255 and G = B = 0 is red is associated with the RGB data (see FIG. 1) that is input data to the monitor 10. Although (X1R / Y1R / Z1R) and (X2R / Y2R / Z2R) have been described, it is not determined whether the data is in the red region by directly associating it with the input data to the monitor 10. Alternatively, a red region may be defined in the color system, and data existing in the defined red region may be red data.
(Third example)
In the case of the first example and the second example described above, in some operations, conversion from XYZ data 1 to L * a * b * and conversion from XYZ data 2 to L * a * b * The white data (X1w / Y1w / Z1w) of XYZ data 1 is used for both. That is, in the case of the first example and the second example described above, the XYZ data 1 and the XYZ data 2 are not calculated independently of each other.

  On the other hand, in the case of the third example described below, the calculation unit 52 uses the XYZ data 1 and the XYZ data 2 independently to set the white brightness as the first index value and the XYZ color specification. A function value including X and Z as variables in the system is set as a second index value.

  In this third example, specifically, Yw representing the luminance in (Xw / Yw / Zw) which is XYZ data (white data) when R / G / B = 255/255/255 is white. Is adopted as the first index value representing the above. Then, the ratio Xw / Zw between Xw and Zw representing the color balance is adopted as the second index value representing the color color.

  FIG. 7 is a diagram showing an example of a two-dimensional chart having the luminance Yw as the vertical axis and the color balance Xw / Zw as the horizontal axis.

  The coordinate point O is an initial coordinate point calculated based on colorimetry at the time when the monitor 10 is obtained.

  On the other hand, the coordinate point A is shifted in the vertical axis direction from the coordinate point O. This means that the luminance Yw has changed.

  Further, the coordinate point B is displaced in the horizontal axis direction from the coordinate point O. This means that although the luminance Yw has not changed, the color balance has been lost.

  Further, the coordinate point C is shifted in both the vertical axis direction and the horizontal axis direction compared to the coordinate point O. This means that the luminance Yw changes and the color balance is broken.

  In the two-dimensional chart of FIG. 7, a frame F is shown as in the two-dimensional charts (see FIGS. 5 and 6) in the first and second examples described above. This frame F indicates an allowable error range of color reproduction of the monitor 10 (see FIG. 1). That is, when the coordinate point obtained by the latest colorimetry is inside the frame F, it indicates that the monitor 10 has sufficient color reproducibility. On the other hand, when the coordinate point C deviates from the frame F, it is recommended to perform color calibration (color management) again.

を採用してもよい。あるいは、

と色温度との双方を変数とする関数により算出される値を、白を代表する第１の指標値（ここでは縦軸）としてもよい。 Here, the luminance Yw is the vertical axis, but instead of the luminance Yw,

May be adopted. Or

A value calculated by a function having both the color temperature and the color temperature as variables may be a first index value (in this case, the vertical axis) representing white.

  Here, the horizontal axis is the color balance Xw / Zw, but the reverse ratio Zw / Xw may be the horizontal axis, and Xw / Zw or Zw / Xw other than Xw / Zw or Zw / Xw may be The function value included as a variable may be on the horizontal axis. Alternatively, the horizontal axis may be a function value that includes Xw and Zw as variables.

(4th example)
In the fourth example, the “lightness (relative)” in the initial state and the state after lapse of time when the lightness in the initial state of the monitor 10 is used as a reference in the calculation unit 52 (see FIG. 4) Is a first index value representative of In the fourth example, the “color difference (absolute)” in the first example is the second index value represented by the color color.

That is, here, as the first index value,

である。

It is.

  Further, as the second index value, the equations (3), (4), and (6) in the first example described above are used to calculate “color difference (absolute)”.

  FIG. 8 is a diagram showing a two-dimensional chart with “lightness (relative)” on the vertical axis and “color difference (absolute)” on the horizontal axis.

  The coordinate point O is an initial coordinate point calculated by measuring the color when the monitor 10 is obtained.

  The coordinate point A is at a position lower than the coordinate point O in the vertical axis direction. This means that “brightness (relative)”, that is, the brightness of white has decreased.

  Further, the coordinate point B is displaced in the horizontal axis direction from the coordinate point O. This means that the brightness of white has not changed, but the color balance is lost.

  Furthermore, the coordinate point C is shifted in both the vertical axis direction and the horizontal axis direction compared to the coordinate point O. This means that the brightness of white has changed and the color balance has been lost.

  Further, in the two-dimensional chart of FIG. 8, a frame F is shown in the same manner as the two-dimensional chart (see FIGS. 5 to 7) in the first to third examples. This frame F indicates an allowable error range of color reproduction of the monitor 10 (see FIG. 1). That is, when the coordinate point obtained by the latest colorimetry is inside the frame F, it indicates that the monitor 10 has sufficient color reproducibility. On the other hand, when the coordinate point C deviates from the frame F, it is recommended to perform color calibration (color management) again.

と色温度との双方を変数とする関数により算出される値を、白を代表する第１の指標値（縦軸）としてもよい。 Here, “brightness (relative)” is the vertical axis, but instead of “brightness (relative)”, the luminance is used as the first index value (vertical axis) representing white as in the third example. Yw may be adopted. Or

A value calculated by a function having both the color temperature and the color temperature as variables may be a first index value (vertical axis) representing white.

  Also for the horizontal axis, instead of “color difference (absolute)”, the “color difference (absolute) of a specific color” described in the second example may be adopted.

  As described above, in each of the above examples, the color reproducibility of the monitor 10 is displayed as a two-dimensional chart with the first index value representing white as the vertical axis and the second index value representing color as the horizontal axis. doing. For this reason, according to each of the above-described examples, it is more convenient for the general user to display the color representing the color of the display image, such as “luminance” or “brightness”, “color temperature”, and “color difference”. The change is easily displayed. In each of the above examples, a frame F indicating a range where good color reproducibility is maintained is shown on the two-dimensional chart. For this reason, in the above-described examples, the display is easier to understand for general users.

  Here, the change over time of the display screen 11 of one monitor 10 has been described, but the present invention can be applied to the case where the colors of the display screens 11 of a plurality of monitors 10 are compared with each other. Can be applied.

(Fifth example)
In the case of the first to fourth examples described above, the calculation unit 52 (see FIG. 4) uses the measurement data of the XYZ data 1 when the monitor 10 is obtained and the XYZ data 2 after the lapse of time.
On the other hand, in the case of the fifth example described below, XYZ data 3 defined by a monitor standard color space represented by sRGB Color Space (IEC 61966-2-1) is used.
In the fifth example, white data (XYZ data 3 (reference value) white data (reference value) defined by a monitor standard color space represented by sRGB Color Space (IEC 61966-2-1) is calculated in the calculation unit 52 (see FIG. 4). X3w / Y3w / Z3w) is applied to both the XYZ data 3 and the XYZ data 1 at the time of obtaining the monitor 10 or the XYZ data 2 after the lapse of time, and the XYZ data 1 or the XYZ data 2 The color difference between them is “color difference (relative)” which is an example of a first index value representing white. The XYZ data 3 is applied with the white data (X3w / Y3w / Z3w) of the XYZ data 3, the XYZ data 1 is the XYZ data 1, the XYZ data 2 is the white data (X1w / The color difference between XYZ data 3 and XYZ data 1 or XYZ data 2 when Y1w / Z1w or X2w / Y2w / Z2w) is applied is an example of a second index value representing a color color. (Absolute) ".

10 monitor 11 display screen 20 chromaticity meter 30 personal computer (PC)
31 Display Screen 50 Index Display Device 51 Acquisition Unit 52 Calculation Unit 53 Display Unit 100 Colorimetric / Index Display System

Claims (9)

Acquisition of acquiring a first colorimetric value and a second colorimetric value, which are colorimetric values of two image display devices, including one image display device at two different points in time And
Based on the first color measurement value and the second color measurement value, the first index value representing white displayed on each of the two image display devices and the two image display devices. A calculation unit for calculating a second index value representing the color color displayed on each of them;
Calculations are made for each of the two image display devices on a two-dimensional chart represented by a first axis having the first index value as a variable and a second axis having the second index value as a variable. An indicator display device comprising: a display unit that displays coordinate points including the first index value and the second index value.   The index display device according to claim 1, wherein the display unit further displays an allowable error range of color reproduction of the two image display devices on the two-dimensional chart.   The first image display device when the calculation unit applies the white colorimetric value of the first image display device to both the first image display device and the second image display device; and The color difference with the second image display device is used as the first index value. For the first image display device, the colorimetric value of white of the first image display device is applied and the color difference is applied. For the second image display device, the color difference between the first image display device and the second image display device when the white colorimetric value of the second image display device is applied is determined as the second image display device. The index display device according to claim 1, wherein an index value of 2 is used.   The first image display device when the calculation unit applies the white colorimetric value of the first image display device to both the first image display device and the second image display device; and The color difference with the second image display device is used as the first index value. For the first image display device, the colorimetric value of white of the first image display device is applied and the color difference is applied. For the second image display device, the color difference of a specific color between the first image display device and the second image display device when the white colorimetric value of the second image display device is applied The index display device according to claim 1, wherein the index value is the second index value.   The calculation unit, wherein white brightness is used as the first index value, and a function value including X and Z in the XYZ color system as variables is used as the second index value. 3. The index display device according to 1 or 2.   The index display device according to claim 5, wherein the function value is a value of a function including X / Z or Z / X.   The calculation unit uses the lightness of each of the first image display device and the second image display device when the lightness of the first image display device is used as a reference as the first index value, and The first color display value of the first image display device is applied to the first image display device, and the white color measurement value of the second image display device is applied to the second image display device. The index display device according to claim 1, wherein a color difference between the first image display device and the second image display device at the time is set as the second index value. An acquisition unit for acquiring a reference value to be set for one image display device and a colorimetric value of the image display device after the reference value is set;
Based on the reference value and the colorimetric value, a first index value representing white displayed on the image display device and a second index value representing color color displayed on the image display device. A calculation unit for calculating,
A first index calculated for the image display device on a two-dimensional chart represented by a first axis having the first index value as a variable and a second axis having the second index value as a variable. An indicator display device comprising: a display unit that displays a coordinate point composed of a value and a second indicator value. The information processing apparatus is executed in an information processing apparatus that executes a program.
Acquisition of acquiring a first colorimetric value and a second colorimetric value, which are colorimetric values of two image display devices, including one image display device at two different points in time And
Based on the first color measurement value and the second color measurement value, the first index value representing white displayed on each of the two image display devices and the two image display devices. A calculation unit for calculating a second index value representing the color color displayed on each of them;
Calculations are made for each of the two image display devices on a two-dimensional chart represented by a first axis having the first index value as a variable and a second axis having the second index value as a variable. An index display program that operates as an index display device including a display unit that displays coordinate points including the first index value and the second index value.

Images