JP3714877B2 - Image display device and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image display apparatus such as a display or a projection video projector that displays an image using a display device such as a CRT, LCD, or PDP, and a program.
[0002]
[Prior art]
Currently, with the advancement of digital television broadcasting technology, the specifications of video signals (video signals) sent from a video signal transmission device such as a broadcast VTR are the scanning frequency, video display period, and display position of the video signal to be displayed. There are a wide variety of video return periods.
[0003]
For this reason, a so-called multi-scan display has been used in which a single image display device can display an appropriate video corresponding to various video signals (video signals).
[0004]
Furthermore, in recent years, in addition to the CRT that has been the mainstream as a display device, the progress of new display devices such as LCD and PDP is remarkable, and image display apparatuses using these devices are also on the market.
[0005]
In particular, some image display apparatuses in the field that require color reproduction faithful to the video signal standard display the video signal after color space conversion according to the display device.
[0006]
Hereinafter, an example of a conventional image display device that performs color space conversion will be described with reference to the drawings.
[0007]
FIG. 7 shows a simplified block diagram of a conventional image display device that performs color space conversion.
[0008]
In FIG. 7, a conversion matrix circuit 10 that performs color space conversion of RGB video signals is connected to a display device 12 via a display interface 11. The display device 12 is, for example, a CRT or LCD.
[0009]
In the conventional image display apparatus configured as described above, RGB video signals are first color space converted by the conversion matrix circuit 10. The conversion matrix circuit 10 is a circuit that primarily converts an RGB video signal. FIG. 8 shows an internal block diagram of the conversion matrix circuit 10 as a configuration example for performing such primary conversion.
[0010]
The RGB video signal input to the conversion matrix circuit 10 is output as an output R′G′B ′ through a 3 × 3 matrix operation. In FIG. 8, the multiplication circuit portion applies a constant to each input RGB component, but the constant portion is omitted in the figure.
[0011]
The video signal R′G′B ′ output from the conversion matrix circuit 10 is processed into a signal suitable for driving the display device 12 by the display interface 11, reaches the display device 12, and the display device 12 displays an image. To do.
[0012]
Since R′G′B ′ is an output after matrix calculation as shown in FIG. 8, any signal may be a signal indicating a negative value, particularly near the primary color. In that case, even if the signal can be negative, the display light from the display device cannot be negative, so the negative signal is equivalent to a zero signal. For example, if the RGB video signal level is (0, 0, 200) converted to (11, -12, 206) as R'G'B 'by the conversion matrix circuit 10, the display light is ( 11, 0, 206).
[0013]
[Problems to be solved by the invention]
In such an image display device, if any of the signals R′G′B ′ becomes a signal indicating a negative value, the signal may be negative, but there is no negative display light. As a result, the signal level of other colors may be relatively high, resulting in an image in which the vicinity of the primary color is strongly developed. In the example given in the description of the prior art, since the RGB video signal level that is the source of the display light is changed from (0, 0, 200) to (11, 0, 206), the CIE 1931 XYZ color system is used. The stimulus value Y indicating the brightness as defined is increased by about 50%.
[0014]
That is, in the conventional image display device, there is a problem that when the video signal is color space converted, the displayed video may be a video in which the vicinity of the primary color is strongly developed.
[0020]
In view of the above-described problems, the present invention prevents an displayed color from being strongly developed in the vicinity of a primary color even when color space conversion is performed, and an image display device capable of displaying a video without a sense of incongruity, and The purpose is to provide a program.
[0023]
[Means for Solving the Problems]
In order to solve the above-described problem, a first aspect of the present invention (corresponding to claim 1) includes display means for displaying an image,
When a first color signal, which is a color signal representing a color, is input from among video signals representing a color based on the first color space, the display means displays the color of the first color signal. Color space conversion means for converting into a second color signal that is a signal representing a color based on a second color space that is a color space used for the purpose;
The second element value is corrected by modifying the value of the other element value according to the value of at least one element value among the plurality of element values representing the combination of the colors indicated by the converted second color signal. Color correction means for correcting the color signal,
The display means displays a video color of the video signal based on the corrected second color signal ;
The at least one element value is an R value, a G value, or a B value in an RGB space used by the display unit to display a color,
The other element value is an element value other than the at least one element value among the R value, the G value, and the B value,
Modifying the value of another element value according to the value of the at least one element value means that when the value of the at least one element value is less than 0, the value of the other element value is modified, If the value of one element value is greater than or equal to 0, the value of the other element value is not modified;
The color correction means corrects the value of the other element value as the absolute value of the difference between the value of the at least one element value and the predetermined value is larger when correcting the value of the other element value. An image display device characterized by increasing the amount .
[0033]
The second of the present invention (corresponding to claim 2), the first of the onset Ming images display device, display means for displaying an image,
When a first color signal, which is a color signal representing a color, is input from among video signals representing a color based on the first color space, the display means displays the color of the first color signal. Color space conversion means for converting into a second color signal that is a signal representing a color based on a second color space that is a color space used for the purpose;
The second element value is corrected by modifying the value of the other element value according to the value of at least one element value among the plurality of element values representing the combination of the colors indicated by the converted second color signal. a program for causing a computer to function as a color correction means to correct the color signals,
The display means displays a video color of the video signal based on the corrected second color signal;
The at least one element value is an R value, a G value, or a B value in an RGB space used by the display unit to display a color,
The other element value is an element value other than the at least one element value among the R value, the G value, and the B value,
Modifying the value of another element value according to the value of the at least one element value means that when the value of the at least one element value is less than 0, the value of the other element value is modified, If the value of one element value is greater than or equal to 0, the value of the other element value is not corrected, and the color correcting means corrects the value of the other element value when the at least one element value is corrected. The amount of correction of the value of the other element value increases as the absolute value of the difference between the value of the value and the predetermined value increases .
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1-2.
[0037]
In FIG. 1 to FIG. 2 , the same numbers are assigned to components that play the same role as the conventional example. In addition, video signals and the like do not distinguish between analog and digital, but this does not particularly limit the contents of the present invention, and the present invention is effective in either case.
[0038]
(Embodiment 1)
FIG. 1 shows a block diagram of an image display apparatus according to Embodiment 1 of the present invention.
[0039]
In FIG. 1, 10 is a conversion matrix circuit, 11 is a display interface, and 12 is a display device. Unlike the conventional example, what is described below is inserted between the conversion matrix circuit 10 and the display interface 11.
[0040]
That is, reference numeral 13 denotes a correction level generation unit to which the output G ′ of the conversion matrix circuit 10 is input. The correction level generation unit 13 outputs a level correction signal for correcting the level of the outputs R ′ and B ′ of the conversion matrix circuit 10 and puts it into an adder for each of R ′ and B ′. A signal G ^* changed according to the value is output and input to the display interface 11.
[0041]
Signals R ^* and B ^* after R ′ and B ′ have passed through the adder are also input to the display interface 11. The output of the display interface 11 is connected to the display device 12. The display device 12 is, for example, a CRT or LCD.
[0042]
The part shown as an adder in FIG. 1 also includes a subtraction function. Further, the role may be substituted by a multiplier.
[0043]
The display device 12 of the present embodiment is an example of the display means of the present invention, the conversion matrix circuit 10 of the present embodiment is an example of the color space conversion means of the present invention, and the correction level of the present embodiment. The generator 13 and the adder are examples of the color correction means of the present invention, and the R ′ value, the G ′ value, and the B ′ value of the present embodiment are examples of a plurality of element values of the present invention. Yes, the value of G ′ in the present embodiment is an example of the value of at least one element value of the present invention, and the values of R ′ and B ′ of the present embodiment are the values of other element values of the present invention. For example, RGB in the present embodiment is an example of the first color signal of the present invention, and R′G′B ′ in the present embodiment is an example of the second color signal of the present invention.
[0044]
The operation of the image display apparatus configured as described above will be described below.
[0045]
In FIG. 1, RGB image signals are first subjected to color space conversion by a conversion matrix circuit 10. Since the internal operation of the conversion matrix circuit 10 is the same as the conventional one, its description is omitted.
[0046]
Among the video signals R′G′B ′ output from the conversion matrix circuit 10, first, G ′ is a level (for example, a negative value) at which the signal level strongly develops other colors in the correction level generator 13. ) Is determined.
[0047]
When the level is such that other colors are strongly developed, a level correction signal for R ′ and B ′ is output, and a changed signal G ^* is output. R ′ and B ′ are corrected by adjusting the level according to the level correction signal, and input to the display interface 11 as R ^* and B ^* .
[0048]
The display interface 11 receives the R ^* , G ^* , and B ^* signals and processes them into signals suitable for driving the display device 12. Then, the display device 12 inputs the processed signal and displays an image. As a result, the display light of R and B is suppressed from unnaturally strong color development.
[0049]
If G ′ is not at a level that strongly develops other colors, R′G′B ′ passes through the display interface 11 as R ^* , G ^* , B ^* without modification.
[0050]
As described above, the correction level generation unit that generates the correction value of the level of another color based on the level of at least one color signal among the RGB outputs of the conversion matrix unit, and the correction level generation unit are generated. By providing an increase / decrease unit for increasing / decreasing the color signal level based on the correction value, it is possible to prevent a certain color from being strongly developed near the primary color even when color space conversion is performed.
[0051]
Here, the configuration of the correction level generator 13 will be described with reference to FIG.
[0052]
FIG. 2 is a block diagram showing the internal configuration of the correction level generator 13 of FIG.
[0053]
In FIG. 2, 14 is a polarity discriminating unit, and an input is connected to the polarity discriminating unit 14 and a multiplication circuit. In FIG. 2, the multiplication circuit portion applies a constant, but the constant portion is omitted in the figure. Reference numerals 15 a to 15 c denote signal data switching circuits, which are switched between constants and signals by a switching signal from the polarity discrimination unit 14.
[0054]
The operation will be described below with reference to FIG. The output G ′ from the conversion matrix circuit 10 in FIG. 1 is input to the correction level generator 13. In the correction level generation unit 13, the polarity of the input signal G ′ is first determined by the polarity determination unit 14.
[0055]
Further, a signal having a value proportional to G ′ enters one of the inputs of the signal data switching circuits 15a and 15c. The other input of both the signal data switching circuits 15a and 15c is a constant such as zero.
[0056]
When the polarity of G ′ is determined to be positive, the signal data switching circuit 15 is switched to the constant side and 15b is switched to the signal side, and when it is determined to be negative, the signal data switching circuit 15 is switched to the opposite side.
[0057]
Accordingly, when the polarity of G ′ is determined to be positive, the output correction value is a constant such as zero, and G ′ is also output as it is, but when it is determined to be negative, the output G ^* is a constant such as zero. And a signal having a value proportional to G ′ is output as a correction value.
[0058]
That is, when G ′ is negative, the correction of other colors can be increased when the absolute value of G ′ is large, and the correction of other colors can be decreased when the absolute value is small.
[0059]
As described above, the correction level generation unit compares the input color signal level with a certain threshold (zero in the above example), and the value based on the input color signal level. A signal data switching unit that switches between another constant value and the input color signal and outputs the signal as a new color signal. By performing the switching operation, it is possible to output a signal with an appropriate correction value dynamically when the correction of the video signal level is necessary, and as a result, the correction of the color development in the vicinity of the primary color of the image display device is optimal. Can be done.
[0060]
In the above embodiment, an example is shown in which the correction level generation unit 13 is provided only in the subsequent stage of G ′. However, this does not particularly limit the contents of the present invention. Depending on the matrix elements, there may be a case where a modification level generation unit 13 is provided in the subsequent stage of R ′ or B ′, or a plurality thereof.
[0061]
The embodiment of the present invention has been described above. Hereinafter, related techniques of the present invention will be described as Embodiments 2 to 4.
(Embodiment 2)
The second embodiment which is a related technique of the present invention solves the following problems.
That is, a fixed value is used as a conversion constant that is a value of each element of the conversion matrix when the conversion matrix circuit 10 in the conventional image display apparatus performs primary conversion of RGB video signals.
Therefore, it is impossible to finely adjust the color tone of the intermediate color by controlling the intermediate color such as CMY (cyan, magenta, yellow).
That is, the conventional image display apparatus has a problem that the color tone of the intermediate color cannot be finely adjusted.
The second embodiment is intended to provide an image display device and a program capable of finely adjusting the color tone of intermediate colors in consideration of the above-described problems.
FIG. 3 shows the internal configuration of the conversion matrix circuit of the image display device according to the second embodiment which is a related technique of the present invention. The parts indicated by x and + in the figure are the multiplication circuit and the addition (subtraction), respectively. Part of the circuit. As a configuration of the entire image display device, the conventional example of FIG. 8 and the first invention shown in FIG. 1 can be cited as examples.
[0062]
3, an input RGB video signal is output as an output R "G" B "through a 3 × 3 matrix operation, and the multiplication circuit portion in FIG. However, the constant part is omitted in the figure.
[0063]
Adjustment units 16a to 16f for finely adjusting a constant to be applied are connected to the multiplication circuit portion. The multipliers from which R to R ″, G to G ″, and B to B ″ are derived are connected to adjusting units 16a to 16c, and G and B to G ″, B ″ and R and B to R ″. , B ″, R, and G are connected to the multiplication circuit from which a part of R ″ and G ″ is derived, and adjustment units 16d to 16f are connected to each other so that the constants applied by the multiplication circuit portions can be finely adjusted.
[0064]
Although not shown, fine adjustment values can be input to the adjustment units 16a to 16e, and the operator can arbitrarily change the fine adjustment values.
[0065]
The matrix of the present embodiment is an example of the conversion matrix of the present invention, the conversion matrix circuit of the present embodiment is an example of the color space conversion means of the present invention, and the adjusting units 16a to 16e of the present embodiment. These are examples of the transformation matrix adjusting means of the present invention.
[0066]
The operation of the conversion matrix circuit of the image display device configured as described above will be described below.
[0067]
The input RGB video signal is output as an output R "G" B "through a 3 × 3 matrix operation, and by moving the fine adjustment values of the adjustment units 16a to 16e, not only RGB but also CMY The intermediate color (cyan, magenta, yellow) is also finely adjusted.
[0068]
As described above, an image display device capable of finely adjusting the intermediate color in the conversion matrix circuit by including the adjustment unit that can change the values of at least two elements other than the elements on the main diagonal of the matrix elements. Get.
[0069]
Here, the configuration of the adjustment unit 16 will be described with reference to FIG.
[0070]
FIG. 4 is a diagram showing an internal configuration of one of the adjustment units 16d to 16f in FIG. The fine adjustment data input in FIG. 4 is divided into fine adjustment data a that is output as it is, and fine adjustment data b that is output after being inverted in sign by the sign inversion unit 20 configured in the adjustment unit.
[0071]
Therefore, when the value of one of the two matrix elements related to the intermediate color is increased, the other value can be decreased in the adjustment unit configured as shown in FIG. Therefore, when R "G" B "is in the vicinity of the primary color, the intermediate color can be adjusted with little influence.
[0072]
As described above, the adjustment unit 16 includes an adjustment value input unit, at least two or more adjustment value output units, and a sign inversion unit for inverting the sign of the input adjustment value signal. Since at least one of the output sections is an output through the sign inversion section, the intermediate colors can be finely adjusted substantially independently.
[0073]
(Embodiment 3)
The third embodiment which is a related technique of the present invention solves the following problems.
In other words, when a signal that conforms to video signal standards with different standard values for the three primary colors is input, or when the color temperature to be displayed is changed, the conversion matrix constants are not appropriate, and accurate color space conversion is possible. Disappear.
That is, the conventional image display device has a problem that accurate color space conversion cannot be performed when video signals having different standard values of the three primary colors are input or when the color temperature to be displayed is changed.
In the third embodiment, in consideration of the above problems, an image display device capable of performing accurate color space conversion even when video signals having different standard values of the three primary colors are input or when the color temperature to be displayed is changed. And the purpose of providing a program.
FIG. 5 shows a block diagram of an image display apparatus according to Embodiment 3 which is a related technique of the present invention.
[0074]
In FIG. 5, a conversion matrix circuit 10 that performs color space conversion of RGB video signals is connected to a display device 12 via a display interface 11. The display device 12 is, for example, a CRT or LCD.
[0075]
The coefficient table unit 25 having the conversion coefficients (matrix element values of the matrix operation) of the conversion matrix circuit 10 as a plurality of numerical tables, and the coefficient selection for selecting the plurality of numerical tables of the coefficient table unit 25 based on various information The unit 26 is installed.
[0076]
The coefficient selection unit 26 according to the present embodiment is an example of the transformation matrix selection unit of the present invention.
[0077]
The operation of the image display apparatus configured as described above will be described below.
[0078]
In FIG. 5, the RGB video signal is first subjected to color space conversion by the conversion matrix circuit 10.
[0079]
The conversion coefficient used in the calculation in the conversion matrix circuit 10 is a numerical table selected from the coefficient table unit 25 by the coefficient selection unit 26 based on information such as the video system and white balance input to the image display device. It is done.
[0080]
The video signal R′G′B ′ output from the conversion matrix circuit 10 is processed into a signal suitable for driving the display device 12 by the display interface 11, reaches the display device 12, and the display device 12 displays an image. To do.
[0081]
Here, the display image is selected on the basis of information such as the video system and white balance input to the image display device, and color space conversion is performed with an optimal conversion coefficient.
[0082]
As described above, the information includes the coefficient table unit including a plurality of coefficient tables and the coefficient selection unit that generates information for selecting the coefficient table based on internal or external information, and the conversion matrix unit generates information generated by the coefficient selection unit. Since the matrix calculation is performed with reference to the coefficient table of the coefficient table unit selected by the above, it is possible to always display an image that has been subjected to optimal color space conversion.
[0083]
(Embodiment 4)
The fourth embodiment which is a related technique of the present invention solves the following problems.
In other words, when a signal that conforms to video signal standards with different standard values for the three primary colors is input, or when the color temperature to be displayed is changed, the conversion matrix constants are not appropriate, and accurate color space conversion is possible. Disappear.
In the fourth embodiment, in consideration of the above problems, an image display device capable of performing accurate color space conversion even when video signals having different standard values of the three primary colors are input or when the color temperature to be displayed is changed. And the purpose of providing a program.
FIG. 6 shows a block diagram of an image display apparatus according to Embodiment 4 of the present invention. In FIG. 6, a conversion matrix circuit 10 that performs color space conversion of RGB video signals is provided via a monochrome display unit 21 and a display interface 11. It is connected to the display device 12. The display device 12 is, for example, a CRT or LCD. In addition, a coefficient table unit 25 having the conversion coefficients of the conversion matrix circuit 10 (values of matrix elements for matrix calculation) as a plurality of numerical tables is provided.
[0084]
The photometric device 22 is installed at a position where the display light of the display device 12 can be received. The output data of the photometric device 22 is input to the coefficient calculation unit 24, and the output of the coefficient calculation unit 24 is connected to the coefficient table unit 25. . The coefficient calculation unit 24, the single color display unit 21, and the coefficient calculation control unit 23 are configured to be controlled.
[0085]
The monochromatic display unit 21 of the present embodiment is an example of the monochromatic display means of the present invention, the photometric device 22 of the present embodiment is an example of the photometric means of the present invention, and the coefficient calculation control of the present embodiment. The unit 23 and the coefficient calculation unit 24 are examples of the transformation matrix calculation means of the present invention.
[0086]
The operation of the image display apparatus configured as described above will be described below.
[0087]
In FIG. 6, the RGB video signal is first color space converted by the conversion matrix circuit 10.
[0088]
The conversion coefficient used in the calculation in the conversion matrix circuit 10 is a numerical table selected from the coefficient table unit 25 by the coefficient selection unit 26 based on information such as the video system and white balance input to the image display device. It is done.
[0089]
The video signal R′G′B ′ output from the conversion matrix circuit 10 and passed through the monochromatic display unit 21 is processed into a signal suitable for driving the display device 12 by the display interface 11 and reaches the display device 12 to reach the display device. 12 displays an image.
[0090]
Here, when the coefficient calculation control unit 23 controls the single color display unit 21 so that only one of RGB colors is allowed to pass, the display device emits only R, for example, and the photometric device 22 receives R light and receives the light. The chromaticity information is transmitted to the coefficient calculation unit 24.
[0091]
Further, when the control of G and B and monochromatic light emission is switched, the coefficient calculation unit 23 collects chromaticity information for each of RGB. The coefficient calculation unit 23 creates a coefficient table suitable for the display device 12 based on the collected RGB chromaticity information and the data of the white balance and video system that is previously held, and the coefficient table of the coefficient table unit 25 is newly created. Can be created or updated.
[0092]
As described above, the monochrome display unit that switches the signals of each RGB color to a signal that displays only a single color, the photometric device that measures the light output from the display device, and the coefficient of the coefficient table from the output of the photometric device A matrix that can perform color space conversion optimal for the characteristics of the display device by including a coefficient calculation unit that calculates the coefficient, and a coefficient calculation control unit that controls the single color display unit and the coefficient calculation unit. Calculation coefficients can be obtained.
[0093]
As described above, according to the present embodiment, there is a remarkable effect that even when color space conversion is performed, it is possible to prevent a certain color from being strongly developed in the vicinity of the primary color and to display a video without a sense of incongruity. . Furthermore, even if the color space conversion conditions change, it is possible to easily fine tune the conversion matrix, or the conversion matrix conversion constants can be switched to perform appropriate color space conversion, and the conversion constants can be optimized. The remarkable effect that it can be obtained is obtained.
[0094]
The present invention is a program for causing a computer to execute the functions of all or part of the above-described image display measures of the present invention (or an apparatus, an element, a circuit, a unit, etc.). It is a program that works and works.
[0095]
Further, the present invention includes a computer-readable recording medium that records the program of the present invention.
[0096]
Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.
[0097]
Further, one usage form of the program of the present invention may be an aspect in which the program is transmitted through a transmission medium, read by a computer, and operated in cooperation with the computer.
[0098]
The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet, light, radio waves, sound waves, and the like.
[0099]
As described above, the configuration of the present invention may be realized as software or hardware.
[0100]
【The invention's effect】
As is apparent from the above description, the present invention prevents the displayed color from being strongly developed near the primary color even when color space conversion is performed, and can display an image without a sense of incongruity. A display device and a program can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram of an image display device according to a first embodiment of the present invention. FIG. 2 is a block diagram of a correction level generation unit according to the first embodiment of the present invention. FIG. 4 is a block diagram of an image display device according to Embodiment 3 of the present invention. FIG. 4 is a block diagram of an image display device according to Embodiment 3 of the present invention. Fig. 7 is a block diagram of an example of a conventional image display device. Fig. 8 is a block diagram of a conversion matrix portion of a conventional image display device.
DESCRIPTION OF SYMBOLS 10 Conversion matrix circuit 11 Display interface 12 Display device 13 Correction level generation part 14 Polarity discrimination | determination part 15 Signal data switching circuit 16 Adjustment part 20 Sign inversion part 21 Monochromatic display part 22 Photometry apparatus 23 Coefficient calculation control part 24 Coefficient calculation part 25 Coefficient table Part 26 Coefficient selection part

Claims (2)

Display means for displaying video;
When a first color signal, which is a color signal representing a color, is input from among video signals representing a color based on the first color space, the display means displays the color of the first color signal. Color space conversion means for converting to a second color signal that is a signal representing a color based on a second color space that is a color space used for the purpose;
The second element value is corrected by modifying the value of the other element value according to the value of at least one element value among the plurality of element values representing the combination of the colors indicated by the converted second color signal. Color correction means for correcting the color signal,
The display means displays a video color of the video signal based on the corrected second color signal ;
The at least one element value is an R value, a G value, or a B value in an RGB space used by the display unit to display a color,
The other element value is an element value other than the at least one element value among the R value, the G value, and the B value,
Modifying the value of another element value according to the value of the at least one element value means that when the value of the at least one element value is less than 0, the value of the other element value is modified, If the value of one element value is greater than or equal to 0, the value of the other element value is not modified;
The color correction means corrects the value of the other element value as the absolute value of the difference between the value of the at least one element value and the predetermined value is larger when correcting the value of the other element value An image display device characterized by increasing the amount . The image display device according to claim 1, display means for displaying video,
When a first color signal, which is a color signal representing a color, is input from among video signals representing a color based on the first color space, the display means displays the color of the first color signal. Color space conversion means for converting to a second color signal that is a signal representing a color based on a second color space that is a color space used for the purpose;
The second element value is corrected by modifying the value of the other element value according to the value of at least one element value among the plurality of element values representing the combination of the colors indicated by the converted second color signal. a program for causing a computer to function as a color correction means to correct the color signals,
The display means displays a video color of the video signal based on the corrected second color signal;
The at least one element value is an R value, a G value, or a B value in an RGB space used by the display unit to display a color,
The other element value is an element value other than the at least one element value among the R value, the G value, and the B value,
Modifying the value of another element value according to the value of the at least one element value means that when the value of the at least one element value is less than 0, the value of the other element value is modified, If the value of one element value is greater than or equal to 0, the value of the other element value is not corrected, and the color correcting means corrects the value of the other element value when the at least one element value is corrected. A program for increasing the amount of correction of the value of the other element value as the absolute value of the difference between the value of the value and the predetermined value increases.

Images