JP2003187246A - Image display system, program, information storage medium and image processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display system by which lowering of chroma of an image can be suppressed when a color is transformed by performing matrix transformation according to a target color and to provide a program, an information storage medium and an image processing method. <P>SOLUTION: The image display system is provided with a color area operation part 160 for calculating a displayable color area based on a target profile in a target profile storage part 162, environmental information from a color optical sensor 60 and a projector profile in a projector profile storage part 164, a judgment part 130 for judging whether or not a reproduced color exists in the displayable color area, a matrix generation part 122 for generating a correction matrix and a matrix transformation part 124 for transforming image information by using the generated correction matrix, and a projector color conversion part 120 is constituted so as to perform the matrix transformation when the reproduced color is judged to exist in the displayable color area and so as not to perform the matrix transformation when the reproduced color is judged not to exist in the displayable color area. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display system, a program, an information storage medium and an image processing method.

[0002]

BACKGROUND ART AND PROBLEMS TO BE SOLVED BY THE INVENTION sRG
The image is displayed by matrix-converting the image information in RGB format etc. according to the target color so that the image color equivalent to the target color conforming to the image type such as B or the image display system such as NTSC can be realized. An image display system that does this has been proposed.

In order to realize the appearance of the color of the image that matches the target color, the image display system is affected by environmental light (illumination light, sunlight, etc.), and therefore the image display system considers the visual environment to display the image information. Need to be converted.

However, for example, when the influence of ambient light or the like is large, the reproducible color gamut is greatly narrowed by the matrix conversion in order to realize an equivalent image color appearance.

In such a case, the image display system can originally reproduce only a color gamut narrower than the reproducible color gamut.

Further, for example, in the case of converting image information using a three-dimensional look-up table, the hue, saturation and lightness for deriving a color point corresponding to a certain color point are arbitrarily set and the color gamut is set. Can be adjusted, so that it is possible to widen the saturation direction at the expense of hue and saturation.

However, when the image information is converted using the matrix, the color gamut is uniquely determined, and the color gamut cannot be adjusted as in the case of the three-dimensional lookup table. However, a situation may occur in which the saturation of the image is significantly reduced.

The present invention has been made in view of the above problems, and an object thereof is to suppress a decrease in the saturation of an image when performing color conversion by performing matrix conversion according to a target color. An object is to provide a possible image display system, program, information storage medium, and image processing method.

[0009]

In order to solve the above problems, an image display system according to the present invention is adapted to a target color based on environmental information by visual environment grasping means for grasping the visual environment in a display area of an image. The image information used to display the image so that the image can be reproduced,
An image display system for performing matrix conversion as necessary to display an image, wherein image display means for displaying the image based on the image information, the environment information, a target color profile indicating the target color, and A color gamut calculation unit that calculates a displayable color gamut after matrix conversion and a displayable color gamut within the device color gamut based on a device profile indicating a device color gamut reproducible by the image display unit, and the color. Whether the reproduced color reproduced by the image information after matrix conversion of the image information based on the calculation result of the gamut calculation means belongs to the displayable color gamut,
Determination means for determining whether the color belongs to the non-displayable color gamut, and when the determination color determines that the reproduced color belongs to the non-displayable color gamut, matrix conversion is performed on the image information. If the reproduced color is judged to belong to the displayable color gamut by the judgment means, the image information is subjected to matrix conversion and directed to the image display means. And a color conversion means for outputting.

Further, the program according to the present invention displays the image so that the image conforming to the target color can be reproduced based on the environmental information by the visual environment grasping means for grasping the visual environment in the display area of the image. Is a program for performing matrix conversion of image information for use as necessary, the environment information, a target color profile indicating the target color, and a device color gamut reproducible by image display means for displaying the image. Based on a device profile showing a color gamut calculation means for calculating a color gamut displayable after matrix conversion and a color gamut not displayable within the device color gamut, and based on a calculation result of the color gamut calculation means, After the image information is matrix-converted, the reproduced color reproduced by the image information belongs to the displayable color gamut or the displayable color gamut. Determination means for determining whether or not they belong, and when it is determined by the determination means that the reproduced color belongs to the non-displayable color gamut, the image information is directed to the image display means without performing matrix conversion. When outputting, and when the determining unit determines that the reproduced color belongs to the displayable color gamut, a computer is used as a color converting unit that performs matrix conversion on the image information and outputs the image information toward the image display unit. It is characterized by functioning.

An information storage medium according to the present invention is a computer-readable information storage medium, and stores a program for causing a computer to function as the above means.

Further, the image processing method according to the present invention is based on the environment information indicating the visual environment in the display area of the image,
An image processing method for matrix-converting image information for displaying the image as needed so that an image conforming to a target color can be reproduced, and environmental information indicating a visual environment in a display area of the image. Based on the acquired environmental information, the acquired environment information, the target color profile indicating the target color, and the device profile indicating the device color gamut reproducible by the image display means for displaying the image A color gamut calculation step of calculating a possible color gamut and a color gamut that cannot be displayed in the device color gamut, and the image information after matrix conversion of the image information based on the calculation result in the color gamut calculation step. A determination step of determining whether the reproduced color reproduced by belongs to the displayable color gamut or the display-disabled color gamut;
When it is determined that the reproduced color belongs to the non-displayable color gamut in the determination step, the image information is output without performing matrix conversion, and the reproduced color can be displayed in the determination step. And a color conversion step of performing matrix conversion on the image information and outputting the image information when the image information is determined to belong to the color gamut.

According to the present invention, when it is determined that the reproduced color belongs to the undisplayable color gamut, the image information is output without being subjected to the matrix conversion, so that the color having the saturation that is not originally displayed is displayed. Since it is possible to reproduce, it is possible to suppress deterioration of the saturation of the image.

Here, the target color means, for example, an image display system (for example, NT) selected by the user.
SC, PAL, SECAM, etc.) and image type (for example, R
It is an ideal color based on GB, sRGB, etc.).

In the image display system, the program, and the information storage medium, the color conversion means displays the image information when it is output to the image display means without matrix conversion. Means for generating a correction matrix so that a color gamut that cannot be reproduced within the possible color gamut can be reproduced, and when the judgment color is judged by the judgment means to belong to the displayable color gamut, based on the correction matrix , And means for performing a matrix conversion on the image information.

Further, in the image processing method, in the color conversion step, a color gamut that cannot be reproduced within the displayable color gamut can be reproduced when the image information is output without being matrix-converted. A step of generating a correction matrix, and a step of performing matrix conversion on the image information based on the correction matrix when the reproduction color is determined to belong to the displayable color gamut in the determination step, May be included.

According to this, when the image information is output without being subjected to matrix conversion, the color gamut that cannot be reproduced within the displayable color gamut can be reproduced, so that the color reproduction range can be expanded, and more. Colors can be reproduced with rich saturation.

Further, in the image display system, the program, and the information storage medium, the color gamut calculation section is a matrix-converted luminance value of a predetermined reference color based on the correction matrix, and an initial state of the reference color. And a brightness correction value, and the color conversion means calculates
When the image information is output to the image display unit without being matrix-converted, the brightness value of the image information matches the brightness value after matrix conversion based on the correction matrix, based on the brightness correction value. As described above, the image information may be corrected.

Further, in the image processing method, the color gamut calculation step is performed on the basis of a luminance value of a predetermined reference color after matrix conversion based on the correction matrix and a luminance value of the reference color in an initial state. The color conversion step includes a step of calculating a correction value, and when the image information is output without performing the matrix conversion, the brightness value of the image information is based on the correction matrix based on the brightness correction value. A step of correcting the image information may be included so as to match the brightness value after matrix conversion.

According to this, it is possible to reduce the difference in the brightness value between the case where the matrix conversion is performed and the case where the matrix conversion is not performed, and it is possible to reproduce an image in which the brightness value does not feel strange.

The reference color may be white, for example.

Further, the image display system includes a projection display device having the color gamut calculation means, the color conversion means, the determination means, the image display means, and means for generating a calibration image. And the image display means projects and displays a predetermined calibration image on the display area,
The visual environment comprehension means may comprehend the visual environment in the display area in which the calibration image is displayed.

Further, the image processing method according to the present invention comprises the step of projecting and displaying a predetermined calibration image on the display area prior to the acquisition of the environmental information, and the display area on which the calibration image is displayed. And a step of ascertaining the visual environment in.

According to this, the visual environment can be more appropriately grasped by grasping the visual environment by using the calibration image. Therefore, the color appearance of the image can be reproduced more appropriately.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings, taking a case where the present invention is applied to an image display system using a liquid crystal projector as an example. The embodiments described below do not limit the content of the invention described in the claims. Further, not all of the configurations shown in the following embodiments are indispensable as means for solving the invention described in the claims.

(Description of Entire System) FIG. 1 is a schematic explanatory view of an image display system according to an example of the present embodiment.

A predetermined presentation image is projected from a projector 20 which is a kind of projection type display device provided almost in front of the screen 10 and which is a kind of image display system. The presenter 30 gives a presentation to a third person while pointing the desired position of the image in the image display area 12 which is the display area on the screen 10 with the spot light 70 projected from the laser pointer 50.

When such a presentation is given, the appearance of the image in the image display area 12 varies greatly depending on the ambient light 80.

Therefore, in the present embodiment, as shown in FIG. 1, a color light sensor 60 that functions as a visual environment grasping means for grasping the visual environment is provided, and the environment information from the color light sensor 60 is input to the projector 20. . Color light sensor 6
0 is specifically the image display area 1 in the screen 10.
The second environment information (more specifically, RGB or XYZ tristimulus values) is measured.

The projector 20 includes a color light sensor 60.
A conversion means is provided for generating a conversion matrix based on the environmental information and the target color profile indicating the target color and converting the image information used for image display using the conversion matrix.

However, for example, when the influence of the ambient light 80 is large, the color gamut adjusted to reproduce the same appearance is much narrower than the color gamut that the projector 20 can reproduce, and the color of the image is reduced. The frequency may be significantly reduced.

FIG. 2 is a schematic diagram showing a displayable color gamut and a displayable color gamut.

For example, as shown in FIG. 2, in the xy chromaticity diagram, the device color gamut reproducible by the projector 20 is a triangle R _D G _D B _D , and the projector subjected to matrix conversion based on environmental information. The color gamut that 20 can display is a triangle R _M1 G _M1 B _M1 . In this case, the shaded color gamut G _D G _M1 B _M1 B _D in FIG. 2 becomes a non-displayable color gamut. In the color triangle on the xy chromaticity diagram, the color saturation is lower in the center (for example, the white color W _{D in} the device color gamut, the white color W _M1 after the matrix conversion), and becomes higher toward the periphery.

That is, the area G _D G _M1 B which is the peripheral area
_{Since the M1 BD} has a color gamut that cannot be displayed, the saturation of the image is reduced.

In the present embodiment, in order to suppress the decrease in the saturation of the image, when the reproduced color belongs to the color gamut in which display is impossible, the color is reproduced as it is without performing the matrix conversion.

FIG. 3 shows the non-displayable color gamut shown in FIG.
It is a schematic diagram which shows the color gamut which cannot be displayed when reproduced without performing matrix conversion.

For example, the color gamut G_DG_M1B_M1B_DColors belonging to
Reproduce as it is, color gamut G_DG_M1B_M1B_DColor field not belonging to
Displayable color gamut R when matrix conversion is performed only_M1
G_{M 1}B_M1Gamut G that cannot be reproduced in the inside_M1C1C2B_M1But
Will occur.

This is because the colors belonging to the color gamut G _D G _M1 B _M1 B _D are originally subjected to the matrix conversion by the color gamut G _M1 C1C2B.
It is reproduced as a color belonging to _M1 and has a color gamut G _M1 C
The color belonging to 1C2B _M1 is reproduced as a color belonging to the color gamut C1C2R _M1 by matrix conversion, but since the color belonging to the color gamut G _D G _M1 B _M1 B _D is not matrix-converted, the color gamut G _M1 There is no color that can be reproduced as a color belonging to C1C2B _M1 , and the color gamut G _M1 C1
This is because C2B _M1 becomes blank.

FIG. 4 is a schematic diagram showing a color gamut reproduced without matrix conversion and a color gamut reproduced with matrix conversion.

Therefore, in the present embodiment, a new correction matrix is generated so that the blank color gamut G _M1 C1C2B _M1 can be reproduced, and when the matrix conversion is performed, the correction matrix is used. Conversion of.

Thus, the color gamut R _M2 G _M2 B _M2 is reproduced when the color conversion is performed using the correction matrix, and the color gamut G _D G _M1 B _M1 B _{D is} obtained when the correction matrix is not used. Can be reproduced. Therefore, the entire device color gamut can be reproduced, and even when the matrix conversion is performed in consideration of the appearance of the image in the visual environment, it is possible to suppress the decrease in the saturation of the image.

(Description of Functional Blocks) Next, functional blocks of the image processing unit of the projector 20 for realizing the above-described functions will be described.

FIG. 5 is a functional block diagram of the image processing section 100 in the projector 20 according to an example of this embodiment.

The projector 20 inputs to the A / D converter 110 the R1 signal, G1 signal, and B1 signal that compose the analog RGB signal sent from a PC or the like. CPU
Projector image processing unit 10 controlled by 200
0 performs color conversion on the R2 signal, G2 signal, and B2 signal, which are digital-format image information converted by the A / D conversion unit 110.

Then, the projector 20 uses the R3 signal and the G3 color-converted by the projector image processing unit 100.
The three signals and the B3 signal are input to the D / A conversion unit 180. Then, the L / V (light valve) driving unit 190, which is a part of the image display unit, drives the liquid crystal light valve based on the R4 signal, G4 signal, and B4 signal analog-converted by the D / A conversion unit 180. To project and display the image.

More specifically, the projector image processing section 100 includes a projector color conversion section 120 and a determination section 13.
0, a calibration signal generator 150, a color gamut calculator 160, a target profile storage 162, and a projector profile storage 164.

The calibration signal generator 150
Generates a calibration image signal. The calibration image signal is sent to the A / D converter 110.
Similarly to the signal output from the projector, the projector color conversion unit 1 converts the digital R2 signal, the G2 signal, and the B2 signal into a digital format.
It is input to 20.

In this way, since the calibration image signal is generated inside the projector 20, the calibration is performed by the projector 20 alone without inputting the calibration image signal to the projector 20 from an external input device such as a PC. You can

The projector color conversion unit 120 refers to the RGB digital signals (R2 signal, G2 signal, B2 signal) from the calibration signal generation unit 150 with reference to the projector profile managed by the projector profile storage unit 164. , R suitable for projector output
It is converted into a GB digital signal (R3 signal, G3 signal, B3 signal).

Further, the projector color conversion section 120 uses the digital signals (R2 signal, G2 signal, B signal) which are image information.
A matrix generation unit 122 that generates a correction matrix for converting two signals) and a matrix conversion unit 124 that converts image information using the generated correction matrix.

More specifically, the matrix generator 122 generates a correction matrix so that the color gamut calculated by the color gamut calculator 160 can be reproduced.

Further, the color gamut calculation section 160 makes the color of the image which is the target color and conforms to the visual environment based on the target profile, the environmental information from the color light sensor 60 and the projector profile. , Calculate the color gamut.

Further, the target profile storage unit 162 stores
The target profile is stored, and the projector profile storage unit 164 stores the projector profile.

Here, the target profile is input / output characteristic data of a target color to be a target. As the target color, for example, a color based on image characteristics such as image types such as RGB and sRGB, a color based on an image display system such as NTSC, or the like can be applied. The target color is
It may be fixed, or a selection image may be displayed using the projector 20 to allow the user to select.

The projector profile is input / output characteristic data corresponding to the model of the projector 20.

Further, the judging section 130 judges whether the reproduced color reproduced by the inputted image information belongs to the color gamut which the projector 20 can display or the color gamut which cannot be displayed. For this determination, for example, y = a shown in FIG. 3 obtained from the coordinates of the color gamut (for example, G _M1 B _M1 ).
Using a mathematical expression such as x + b (a and b are constants), if y with respect to x of the reproduced color is greater than or equal to the y value of the above mathematical expression, it belongs to a gamut that cannot be displayed, and if less than the y value of the above mathematical expression, it is displayed It can be determined that it belongs to a possible color gamut.

It should be noted that instead of a function such as y = ax + b, it is also possible to make the determination using, for example, a table showing the respective determination values for xy.

(Description of Flow of Image Processing) Next, a flow of image processing using these units will be described with reference to a flowchart.

FIG. 6 is a flowchart showing the procedure of image processing according to an example of this embodiment.

First, the projector 20 causes the calibration signal generator 150 to generate calibration signals (R2, G2, B2).

The calibration signal generator 150
The calibration signal is sent to the projector color conversion unit 1
Output to 20.

The projector color conversion unit 120 converts the calibration signal using the conversion matrix M0 in the default (initial state) to convert the digital RGB signal (R
3, G3, B3). That is, (R3, G
3, B3) = M0 (R2, G2, B2).

More specifically, the projector color conversion section 1
Reference numeral 20 converts the signals (R2, G2, B2) into XYZ format values so as to facilitate color conversion, and after color conversion, reconverts into RGB format values.

Then, the D / A converter 180 converts the digital RGB signal into analog RGB signals (R4, G4, B).
Convert to 4). Then, the L / V drive unit 190 drives the liquid crystal light valve based on the analog RGB signals (R4, G4, B4). Then, the projector 20
The calibration image is projected and displayed on the image display area 12 (step S2).

With the calibration image displayed in the image display area 12, the color light sensor 60 detects tristimulus values for grasping the visual environment and outputs them to the color gamut calculator 160 as environmental information (step S4). Accordingly, the color gamut calculation unit 160 can grasp the visual environment.

As described above, by grasping the visual environment by using the calibration image, the visual environment can be grasped more appropriately and the color appearance of the image can be reproduced more appropriately. Note that the calibration may be performed manually, or may be automatically performed at regular time intervals.

The color gamut calculation unit 160 has environment information, the target profile stored in the target profile storage unit 162,
Based on the projector profile stored in the projector profile storage unit 164, the displayable color gamut R _M1 G _M1 B _M1 and the non-displayable color gamut G _D G _M1 B shown in FIG.
_{M1 BD} is calculated and obtained (step S6).

More specifically, the color gamut calculation section 160 obtains the displayable color gamut R _M1 G _M1 B _M1 shown in FIG. 2 based on the environment information, the target profile, and the projector profile, and the displayable color gamut is obtained. Based on the information indicating R _M1 G _M1 B _M1
The matrix generation unit 122 generates the color conversion matrix M1. The matrix conversion unit 124 performs color conversion based on the matrix M1, whereby a color that matches the visual environment and the target color is reproduced. In this case, the displayable color gamut R _M1 G _M1 B _M1 is shown (X, Y, Z) = M1 (R
2, G2, B2).

Further, the color gamut calculation section 160 obtains the device color gamut R _D G _D B _D based on the projector profile. In this case, by using the matrix MD, the device color gamut R _D G _D B _D is (X, Y, Z) = MD (R
2, G2, B2).

Then, the judgment unit 130 generates the mathematical expression y = ax + b as the judgment information based on the coordinate values of G _M1 B _M1 in the xy chromaticity diagram (step S8).

Then, the matrix generation unit 122, based on the information from the color gamut calculation unit 160, the color gamut R _M2 shown in FIG.
A correction matrix M2 is generated so that G _M2 B _M2 can be reproduced (step S10).

Further, the color gamut calculation section 160 corrects the brightness based on the brightness value Y1 of the reference white when the matrix conversion is not performed and the brightness value Y2 of the reference white when the matrix conversion is performed using the correction matrix M2. Information Y = Y2 /
Y1 is generated (step S12).

Then, the storage section 120 inputs the image signal (R2, G2, B2) of the actual presentation image (step S14).

The determination section 130 determines whether or not the reproduced color is within the displayable color gamut based on the determination information (step S16). More specifically, the above (X,
Y, Z) = MD (R2, G2, B2), where x and y are x1 and y1, respectively, y1 obtained by comparing y2 obtained by the above equation y2 = ax1 + b Is y2 or more,
The input signals (R2, G2, B2) belong to the displayable color gamut, and if y1 is less than y2, it can be determined that they belong to the displayable color gamut. In general, x value = X /
(X + Y + Z) and y value = Y / (X + Y + Z).

If the determination unit 130 determines that the reproduced color is within the displayable color gamut, the matrix conversion unit 1
24 performs matrix conversion using the correction matrix M2 (step S18). That is, (R3, G3, B
3) = M2 (R2, G2, B2).

On the other hand, when the determination unit 130 determines that the reproduced color is not within the displayable color gamut, the projector color conversion unit 120 performs brightness correction without performing matrix conversion (step S20).

Specifically, the projector color conversion section 120
Performs an operation of (R3, G3, B3) = Y (R2, G2, B2). Accordingly, even when the matrix conversion is not performed, it is possible to reduce the discomfort with the luminance of the color reproduced when the matrix conversion is performed.

Then, the projector color conversion section 120
The digital RGB signals (R3, G3, B3) are output (step S22).

The projector 20 receives the converted digital RGB signals (R3, G3, B3) from the D / A conversion section 180.
Is used for D / A conversion, and an actual presentation image is displayed using the converted analog RGB signals (R4, G4, B4) (step S24).

As described above, according to the present embodiment, when it is determined that the reproduced color belongs to the undisplayable color gamut, the image information is output without being subjected to matrix conversion, so that the original Since it is possible to reproduce a color having a saturation that is not displayed, it is possible to suppress a decrease in the saturation of the image.

Further, according to the present embodiment, when the image information is output without matrix conversion, the color gamut that cannot be reproduced within the displayable color gamut can be reproduced, so that the color reproduction range is widened. Therefore, the image can be reproduced with richer saturation.

Further, according to the present embodiment, even when the image signal is output without performing the matrix conversion, the matrix conversion is performed by correcting the brightness value based on the matrix-converted brightness value. It is possible to reduce the difference in the brightness value between the case and the case where it is not performed, and it is possible to reproduce an image in which the brightness value does not feel strange.

Further, in the present embodiment, the color light sensor 6 is used.
By grasping the visual environment using 0, an image is projected and displayed in consideration of the visual environment.

As a result, the image can be displayed in conformity with the visual environment at the time of displaying the image, and the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, almost the same color can be reproduced in a short time at a plurality of different places.

Further, in the present embodiment, the image information can be converted at a higher speed by converting the image information using the conversion matrix instead of the LUT, and the storage area occupancy is small. Complete.

(Explanation of Hardware) As the hardware used for each of the above-mentioned units, for example, the following can be applied.

For example, the A / D converter 110 is, for example, an A / D converter, and the D / A converter 180 is, for example, a D / A converter.
As the projector color conversion unit 120 such as a liquid crystal light valve drive driver, for example, an image processing circuit or ASIC, as the determination unit 130 or the color gamut calculation unit 160, for example, a CPU or the like, a target profile storage unit 162.
The projector profile storage unit 164 can be realized by using, for example, a RAM or the like. Note that each of these units may be realized by hardware such as a circuit, or may be realized by software such as a driver.

Further, as shown in FIG. 5, the functions of each of these units may be read by a computer in the projector 20 from the information storage medium 300 to cause the computer to function as each unit described above. Examples of the information storage medium 300 include a CD-ROM and a DVD-RO.
M, ROM, RAM, HDD or the like can be applied, and the program reading method may be a contact method or a non-contact method.

Further, it is also possible to make the computer realize each of the above-mentioned functions by downloading a program for realizing each of the above-mentioned functions from a host device or the like via a transmission path.

Further, the color light sensor 60 can be realized by using a monocular or trinocular brightness sensor.

Although the preferred embodiments to which the present invention is applied have been described above, the application of the present invention is not limited to the above-described embodiments.

(Modification) For example, the case where the reproducible color gamut is narrowed may be more complicated than that shown in FIG.

FIG. 7 is another schematic diagram showing the color gamut reproduced without matrix conversion and the color gamut reproduced with matrix conversion. FIG. 8 is another schematic diagram showing a color gamut reproduced without matrix conversion and a color gamut reproduced with matrix conversion.

For example, as shown in FIG. 7, when only one side of the color gamut to be reproduced by performing the matrix conversion is in contact with each side of the device color gamut, or as shown in FIG. In some cases, each side of the color gamut to be touched is not in contact with each side of the device color gamut.

Even in these cases, the present invention can be applied by using a plurality of linear expressions based on the coordinates as the judgment information.

Further, in the case as shown in FIGS. 7 and 8, the color gamuts of all the shaded portions may be reproduced, or only the color gamuts of some of the shaded portions may be emphasized with an emphasis on color appearance. It may be possible to reproduce.

Further, in the above-described embodiment, the device color gamut and the color gamut obtained by performing the matrix conversion once are used. However, the device color gamut and the color gamut obtained by performing the matrix conversion a plurality of times are used. May be.

Further, as the visual environment grasping means, in addition to the color light sensor 60, it is also possible to apply an image pickup means such as a CCD camera or a CMOS camera.

Although the screen 10 described above is of the reflective type, it may be of the transmissive type.

Further, the above-mentioned conversion matrix is a single matrix, but a plurality of matrices may be combined for color conversion. For example, color conversion may be performed by combining an inverse conversion matrix according to the output device and an environment correction matrix reflecting environment information.

The present invention can also be applied to a case where a presentation or the like is performed by displaying an image on a display means other than the projection type image display device such as the projector described above.
Examples of such display means include a liquid crystal projector and a CRT (Cathode Ray Tub).
e), PDP (Plasma Display Pan)
el), FED (Field Emission Di)
spray), EL (Electro Lumines)
C.), a display device such as a direct-view type liquid crystal display device, a DMD (Digital Micromirror), etc.
For example, a projector using Device) is applicable.
DMD is a trademark of Texas Instruments Incorporated in the United States. The projector is not limited to the front projection type, but may be the rear projection type.

In addition to the presentation, the present invention is also applied to the case of displaying images in meetings, medical care, design / fashion fields, sales activities, commercials, education, and general images such as movies, TVs, videos and games. Is valid.

The function of the projector image processing unit 100 of the projector 20 described above may be realized by a single image display device (for example, the projector 20), or may be distributed by a plurality of processing devices (for example, the projector 20). 20 and a PC) may be realized.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an image display system according to an example of the present embodiment.

FIG. 2 is a schematic diagram showing a displayable color gamut and a displayable color gamut.

FIG. 3 is a schematic diagram showing an undisplayable color gamut when the undisplayable color gamut shown in FIG. 2 is reproduced without performing matrix conversion.

FIG. 4 is a schematic diagram showing a color gamut reproduced without matrix conversion and a color gamut reproduced with matrix conversion.

FIG. 5 is a functional block diagram of an image processing unit in the projector according to the example of the present embodiment.

FIG. 6 is a flowchart showing a procedure of image processing according to an example of the present embodiment.

FIG. 7 is another schematic diagram showing a color gamut reproduced without performing matrix conversion and a color gamut reproduced by performing matrix conversion.

FIG. 8 is another schematic diagram showing a color gamut reproduced without performing matrix conversion and a color gamut reproduced by performing matrix conversion.

[Explanation of symbols]

20 projector 50 laser pointer 60 color light sensor 80 Ambient light 120 Projector color converter 122 matrix generator 124 Matrix converter 130 Judgment unit 150 Calibration signal generator 160 color gamut calculator 162 Target Profile Storage Unit 164 Projector profile storage unit 300 information storage medium

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 9/64 H04N 1/40 D 9/67 1/46 Z F term (reference) 5B057 AA20 BA02 CA01 CA08 CA12 CA16 CB01 CB08 CB12 CB16 CE11 CE17 CH07 DA16 DA17 DB02 DB06 DB09 DC25 DC36 5C066 AA03 AA13 CA05 CA08 FA01 GA01 GA11 GA21 GA32 GA33 KD01 KD06 KE01 KE04 KE09 KE17 LK17PQPQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQHQQQQQQQQQQQQQQQQQQQQQQQQQQHQQQQQQQQQQQQQQQQQQQQHQHQOK> LB04 MA04 MA11 MA17 NA03 NA06 PA05 5C082 AA21 BA34 BD02 CA12 CA81 CB01 CB03 DA51 DA87 MM10

Claims (12)

[Claims] 1. The image information used for displaying the image so that the image conforming to the target color can be reproduced based on the environmental information by the visual environment grasping means for grasping the visual environment in the display area of the image. An image display system for displaying an image by performing matrix conversion as necessary, based on the image information, an image display unit for displaying the image, the environment information, and a target color profile indicating the target color, Color gamut calculation means for calculating a displayable color gamut after matrix conversion and a displayable color gamut within the device color gamut based on a device profile indicating a device color gamut reproducible by the image display means; After the image information is matrix-converted based on the calculation result of the color gamut calculation means, the reproduced color reproduced by the image information is the displayable color gamut. Determination unit that determines whether the reproduced color belongs to the undisplayable color gamut, and the determination unit determines whether the reproduction color belongs to the undisplayable color gamut. If the reproduced color is determined to belong to the displayable color gamut by outputting to the image display unit without performing the matrix conversion, the image information is subjected to the matrix conversion to perform the image conversion. An image display system comprising: a color conversion unit for outputting to a display unit. 2. The color gamut according to claim 1, wherein when the color conversion unit outputs the image information to the image display unit without performing a matrix conversion, the color gamut is not reproduced within the displayable color gamut. And a means for generating a correction matrix so that the reproduced color belongs to the displayable color gamut, and matrix conversion is performed on the image information based on the correction matrix. An image display system comprising: 3. The brightness correction unit according to claim 2, wherein the color gamut calculation unit performs brightness correction based on a brightness value of a predetermined reference color after matrix conversion based on the correction matrix and a brightness value of the reference color in an initial state. When a value is calculated and the color conversion unit outputs the image information to the image display unit without performing matrix conversion,
An image display system, characterized in that, based on the brightness correction value, the image information is corrected so that the brightness value of the image information matches the brightness value after matrix conversion based on the correction matrix. 4. The color gamut calculation means, the color conversion means, the determination means, the image display means, and means for generating an image for calibration, according to any one of claims 1 to 3. It is formed as a projection display device, the image display means projects and displays a predetermined calibration image in the display area, and the visual environment grasping means includes the visual environment in the display area in which the calibration image is displayed. An image display system characterized by grasping. 5. The image information for displaying the image is required so that the image suitable for the target color can be reproduced based on the environmental information by the visual environment grasping means for grasping the visual environment in the display area of the image. Is a program for matrix conversion according to, based on the environment information, a target color profile indicating the target color, and a device profile indicating a device color gamut reproducible by an image display unit that displays the image. A color gamut calculation means for calculating a displayable color gamut after matrix conversion and a displayable color gamut within the device color gamut, and after performing matrix conversion on the image information based on the calculation result of the color gamut calculation means. Determining means for determining whether the reproduced color reproduced by the image information belongs to the displayable color gamut or the displayable color gamut. If the determination means determines that the reproduced color belongs to the non-displayable color gamut, the image information is output to the image display means without matrix conversion, and the reproduction is performed by the determination means. A program for causing a computer to function as color conversion means for performing matrix conversion on the image information and outputting the result to the image display means when it is determined that a color belongs to the displayable color gamut. 6. The color gamut according to claim 5, wherein, when the color conversion unit outputs the image information to the image display unit without performing a matrix conversion, the color gamut is not reproduced within the displayable color gamut. And a means for generating a correction matrix so that the reproduced color belongs to the displayable color gamut, and matrix conversion is performed on the image information based on the correction matrix. And a means for performing a program. 7. The brightness correction unit according to claim 6, wherein the color gamut calculation unit performs brightness correction based on a brightness value of a predetermined reference color after matrix conversion based on the correction matrix and a brightness value of the reference color in an initial state. When a value is calculated and the color conversion unit outputs the image information to the image display unit without performing matrix conversion,
A program for correcting the image information so that the brightness value of the image information matches the brightness value after matrix conversion based on the correction matrix based on the brightness correction value. 8. An information storage medium readable by a computer, wherein the program according to any one of claims 5 to 7 is stored. 9. The image information for displaying the image is matrix-converted as necessary so that the image matching the target color can be reproduced based on the environmental information indicating the visual environment in the display area of the image. An image processing method, comprising: acquiring environmental information indicating a visual environment in a display area of the image; acquired environmental information, a target color profile indicating the target color, and an image display for displaying the image. A gamut calculation step of calculating a displayable color gamut after matrix conversion and a displayable color gamut within the device color gamut based on a device profile showing a device color gamut reproducible by the means, and the color gamut calculation After the image information is matrix-converted based on the calculation result in the step, whether the reproduced color reproduced by the image information belongs to the displayable color gamut, or A determination step of determining whether or not it belongs to a non-displayable color gamut, and if it is determined in the determination step that the reproduced color belongs to the non-displayable color gamut, no matrix conversion is performed on the image information. And a color conversion step of performing matrix conversion on the image information and outputting when the reproduction color is determined to belong to the displayable color gamut in the determination step. Image processing method. 10. The color conversion step according to claim 9, wherein when the image information is output without being subjected to matrix conversion, a color gamut that cannot be reproduced within the displayable color gamut can be reproduced. A step of generating a correction matrix; and a step of performing matrix conversion on the image information based on the correction matrix when the reproduction color is determined to belong to the displayable color gamut in the determination step. An image processing method comprising: 11. The brightness correction according to claim 10, wherein the color gamut calculation step is based on a brightness value of a predetermined reference color after matrix conversion based on the correction matrix and a brightness value of the reference color in an initial state. A step of calculating a value, wherein the color conversion step outputs a matrix value based on the brightness correction value based on the brightness correction value when the image information is output without matrix conversion. An image processing method comprising the step of correcting the image information so as to match the converted luminance value. 12. The method according to claim 9, wherein a step of projecting and displaying a predetermined calibration image on the display area prior to the acquisition of the environmental information, and the display target on which the calibration image is displayed. An image processing method comprising: a step of grasping a visual environment in a region.