JP2004072760A - Color adjustment method to be used for projection image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color adjustment method for adjusting colors of a projected image in the optimal manner when a screen whereon the image is projected are slurred from white. <P>SOLUTION: A display area of a screen 50 is divided into regions J and K. A standard image plate 60 is installed on the region J and white light is projected. A color adjusting image of the same pattern as a standard image drawn on the standard image plate 60 is projected onto the region K. In white adjusting processing, while paying attention to white portions of the color adjusting image and the standard image, the white portion of the color adjusting image is adjusted to be close to the white portion of the standard image. In color balancing processing, while paying attention to color balances of the entire color adjusting image and the entire standard image, the color balance of the color adjusting image is adjusted to be close to the color balance of the standard image. In specific color adjusting processing, while paying attention to portions in a specific color of the color adjusting image and the standard image, the specific color portion of the color adjusting image is adjusted to be close to the specific color portion of the standard image. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a color adjustment method used in a projection image display device, and particularly to a color adjustment method used in a projection image display device suitable for use when a screen or a wall on which an image is projected is discolored from white. About the method.

An image projected from a projection image display device such as a liquid crystal projector is displayed on a screen or a wall. However, the color of the screen or the wall is not necessarily the initial white when used, and is, for example, yellow or blue. It may be off. If an image is projected on such a screen or wall, the projected image will be displayed in a color that is significantly different from the actual color, and the projected image will not be seen by the user as the original color. It is necessary to perform color adjustment on the projected image.

Conventionally, as shown in FIG. 22, for example, as shown in FIG. 22, a color adjustment method used in this type of projection image display device is a combination of the projection image display device 10 and the screen 20 so that the user M can display the projection image 30 on the screen 20. Observation is performed by operating the projection image display device 10 based on the observation result.

FIG. 23 is a block diagram showing an electrical configuration of the projection image display device 10 in FIG.
As shown in FIG. 23, the projection image display device 10 includes an operation unit 11, a color correction processing unit 12, an output signal processing unit 13, and a video output unit 14. The operation unit 11 includes key switches and the like, and is operated based on the determination of the user M. The color correction processing unit 12 generates correction data d for correcting an externally supplied video signal in based on an operation performed by the user M on the operation unit 11. The output signal processing unit 13 generates a color-adjusted video signal P by adding the correction data d to the video signal in. The image output unit 14 is configured by, for example, a three-panel projection type liquid crystal display device, and separates white light generated from a light source into red (R), green (G), and blue (B) primary color lights, and outputs the primary colors. After modulating the light in accordance with the video signal P, the light is combined by additive color mixture and projected onto the screen 20.

In the color adjustment method used in the projection image display device 10, when the screen 20 has a color shift from white, the user M observes the color of the projection image 30 and operates the operation unit 11 based on the observation result. As a result, white balance adjustment, color temperature adjustment, color correction (adjustment of luminance, hue, or saturation), etc., are performed, and adjustment is made to improve the appearance.

At present, there is no appropriate prior art document information on the above conventional technology.

However, the color adjustment method used in the above-mentioned conventional projection image display device has the following problems.
That is, in the conventional color adjustment method, the user M observes the color of the projected image 30, and the adjustment is performed by the user M's subjective judgment based on the observation result. For this reason, the color adjustment is performed in a state where there is no accurate reference, and as a result, there is a problem that the user M cannot perform an accurate adjustment.

In order to solve the above problem, the invention according to claim 1 is used for a projection image display device that projects an image corresponding to a video signal on a screen or a wall, and the screen or the wall is discolored from white. An area dividing process of dividing all or a part of a display area of the screen or wall into two areas, and a display of the projection image. A standard image plate on which a standard image displayed in a correct color is drawn when white light is projected from the device is set on the area on one of the screen or the wall, and the standard image is displayed from the projected image display device. A white light projection process of projecting the white light onto a plate, and a color adjustment image having the same pattern as the standard image drawn on the standard image plate from the projection image display device to the screen or A color adjustment image projection process for projecting onto the other area of the wall, and a correction data creation process for creating correction data for correcting the video signal so that the color adjustment image approaches the standard image; A color adjustment process for adjusting a color of the color adjustment image displayed on the screen or the wall by adding correction data to the video signal is performed.

The invention according to claim 2 is used for a projection image display device that projects an image corresponding to a video signal on a screen or a wall, and is displayed on the screen or the wall when the screen or the wall is out of color from white. In a color adjustment method for adjusting the color of the image, an area dividing process of dividing all or a part of the display area of the screen or the wall into two areas, and a standard image is projected from the projection image display device. A standard white plate that is sometimes displayed in the correct color is placed on the screen or one of the areas of the wall, and a standard image projection process of projecting the standard image from the projection image display device to the standard white plate, A color adjustment image for projecting a color adjustment image having the same pattern as the standard image projected on the standard white plate from the projection image display device to the other area of the screen or wall. Projection processing, correction data creation processing for creating correction data for correcting the video signal so that the color adjustment image approaches the standard image, and adding the correction data to the video signal, the screen Alternatively, a color adjustment process for adjusting the color of the image displayed on the wall is performed.

According to a third aspect of the present invention, in the color adjustment method according to the first or second aspect, in the correction data creation processing, each white portion of the color adjustment image and the standard image is focused on, and A white adjustment process for adjusting a white portion to be close to a white portion of the standard image, and focusing on the color balance of the entire color adjustment image and the entire standard image, adjusting the color balance of the color adjustment image to the color of the standard image. A color balance adjustment process for adjusting to approximate the balance, or a specific color portion of the color adjustment image approaching a specific color portion of the standard image by focusing on a specific color portion of the color adjustment image and the standard image. It is characterized in that at least one of the specific color adjustment processes for performing the adjustment is performed.

According to a fourth aspect of the present invention, there is provided the color adjustment method according to the first, second or third aspect, wherein the standard image is white, red, green, blue, or a specific color for use in the correction data creation processing. At least one is included.

The invention according to claim 5 is used for a projection image display device that projects an image corresponding to a video signal on a screen or a wall, and is displayed on the screen or the wall when the screen or the wall is out of color from white. According to a color adjustment method for performing color adjustment of the image, a standard white plate that is displayed in a correct color when a standard image is projected from the projection image display device is provided on a partial area of the screen or wall. And a standard image projection process of projecting the standard image from the projection image display device onto the standard white plate, and a color adjustment image having the same pattern as the standard image projected on the standard white plate. A color adjustment image projection process for projecting the display or the other area of the wall from the display device, and a mark projected on the standard white plate with the color of the color adjustment image projected on the screen or the wall. A color correction building process for building a color correction so as to approach the color of the image, is characterized by performing the color correction processing for performing the color correction to the video signal.

According to a sixth aspect of the present invention, in the color adjustment method according to the fifth aspect, in the color correction construction process, a first color space storage process of storing a first color space on the standard white plate in advance; A color adjustment process for adjusting the color of the standard image to match the color of the color adjustment image; and a color adjustment process for adjusting the color of the standard image after the color adjustment process. A second color space calculation process for calculating a second color space; and a color appearance correction for constructing a color appearance correction such that the color appearances of the first color space and the second color space match. It is characterized by performing construction processing and color appearance correction processing for applying the color appearance correction to the video signal.

The invention according to claim 7 relates to the color adjustment method according to claim 5 or 6, wherein the standard image and the image for color adjustment include at least one of white, red, green, blue, and black. It is characterized by having.

The invention according to claim 8 relates to the color adjustment method according to claim 6, wherein in the color adjustment processing, a GUI (Graphical User Interface) for adjusting lightness, hue, and saturation of the color of the standard image is provided. It is characterized in that it is used.

According to the configuration of the present invention, the standard image plate is installed in one area of the screen or the wall, and the color adjustment of the color adjustment image on the other area of the screen or the wall is performed based on the standard image of the standard image board. Therefore, even when the color of the screen or the wall is shifted from white, the color adjustment for the video signal can be performed by a simple process. Also, a standard white plate is installed in one area of the screen or wall, and the color adjustment of the color adjustment image on the other area of the screen or wall is performed with reference to the standard image on this standard white plate. Even when the color of the screen or the wall is shifted from white, the color adjustment for the video signal can be performed by a simple process.

Further, the color of the standard image projected on the standard white plate is adjusted so as to match the color of the color adjustment image projected on the screen or other area of the wall, and the standard image after this color adjustment is adjusted. A second color space in another area of the screen is calculated based on the color, and color appearance correction is performed so that the color appearance in the stored first color space matches the color appearance in the second color space. Since it is constructed so as to perform color appearance correction on a video signal, color adjustment on the video signal can be performed easily and with high accuracy. Further, since the GUI is used for color adjustment, the operation can be simplified.

(4) To provide a color adjustment method used in a projection image display device in which a user can easily perform color adjustment even when a color of a screen or a wall is shifted from white.

FIG. 1 is a diagram showing a projection image display device for implementing a color adjustment method according to a first embodiment of the present invention and its surrounding environment.
The color adjustment method of this example is performed by combining the projection image display device 40, the screen 50, and the standard image plate 60 as shown in FIG. The projection image display device 40 projects an image corresponding to a given video signal on the screen 50. In particular, in this embodiment, one of two areas, upper and lower or left and right, of the display area of the screen 50 is used. , And an image is projected on the other area.

The screen 50 is shifted in color from white at the beginning of use to yellow or blue due to aging, for example. The standard image plate 60 is installed in the area J of the screen 50, and a standard image displayed in a correct color when white light is projected from the projection image display device 40 through the standard white area W is drawn. The standard image includes, for example, at least one of white, red, green, blue, or a specific color (for example, flesh color, green of a plant, blue of the sky, and the like). In the area K of the screen 50, a color adjustment image having the same pattern as the standard image drawn on the standard image plate 60 is projected from the projection image display device 40 via the color adjustment image projection area C. The user observes the standard image on the area J and the color adjustment image on the area K of the screen 50, and operates the projection image display device 40 based on the observation result, so that the same color adjustment image becomes the same as the standard image. Adjust the color so that the colors are the same.

FIG. 2 is a block diagram showing an electrical configuration of the projection image display device 40 in FIG.
As shown in FIG. 2, the projection image display device 40 includes an internal image generation unit 41, an image switching unit 42, an operation unit 43, a color correction processing unit 44, a screen division processing unit 45, and a video output unit. 70. The internal image generation unit 41 holds a color adjustment image to be projected on the area K of the screen 50 as an internal image in advance, and in particular, in this embodiment, the same image as the standard image drawn on the standard image plate 60 is used. An image for adjusting the color of the picture is generated. The image switching unit 42 selects and switches a video signal in corresponding to an image held as an internal image in the internal image generating unit 41 or an image desired by the user based on a user operation. The operation unit 43 is configured by a key switch or the like, and is operated based on a user's determination.

The color correction processing unit 44 generates correction data d for correcting the image selected by the internal image generation unit 41 based on a user's operation on the operation unit 43. The screen division processing unit 45 generates a color-adjusted image by adding correction data d to the image selected by the image switching unit 42, and generates a video signal P. The video signal P divides the display area of the screen 50 into two left and right areas J and K, projects the same color adjustment image on the area K of the screen 50, and emits white light in the area J of the screen 50 (standard image). It is for projecting onto the plate 60). The video output unit 70 is formed of, for example, a three-panel projection type liquid crystal display device, and separates white light generated from a light source into red (R), green (G), and blue (B) primary color lights, and outputs the primary colors. After modulating the light in accordance with the video signal P output from the screen division processing unit 45, the light is combined with an additive color mixture and projected onto the screen 20.

FIG. 3 is a configuration diagram illustrating an example of the video output unit 70 in FIG.
As shown in FIG. 3, the video output unit 70 is a three-panel projection type liquid crystal projector, and includes a lamp 71, a reflector 72, an interference filter 73, dichroic mirrors 74 and 75, mirrors 76 and 77, 78, liquid crystal light valves 79, 7A, 7B, a dichroic prism 7C, and a projection lens 7D.

In the video output unit 70, the white light generated from the lamp 71 is split into red (R), green (G), and blue (B) primary color lights by dichroic mirrors 74 and 75, and each of the primary color lights is converted into a video signal P. Are modulated (transmitted or shielded by the liquid crystal light valves 79, 7A, 7B) in accordance with the above, are synthesized by the dichroic prism 7C, and are projected on the screen 50 from the projection lens 7D.

FIG. 4 shows an example of a standard image on the standard image plate 60 and an example of a color adjustment image on the area K of the screen 50, and FIG. 5 illustrates a color adjustment method used in the projection image display device 40 of FIG. It is a flowchart for the.
With reference to these figures, the processing content of the color adjustment method used in the projection image display device of this example will be described.
As shown in FIG. 4, the display area of the screen 50 is divided by the screen division processing unit 45 into two left and right areas J and K (step A1, area division processing). The standard image plate 60 is set on the area J of the screen 50, and white light is projected from the projection image display device 40 to the standard image plate 60 (step A2, white light projection processing). A color adjustment image having the same pattern as the standard image drawn on the standard image board 60 is projected from the projection image display device 40 onto the area K of the screen 50 (step A3, color adjustment image projection processing).

The operation unit 43 is operated based on the user's determination, and the correction data d for correcting the video signal in is subjected to the color correction processing so that the color adjustment image on the area K approaches the standard image on the standard image board 60. Created by the unit 44 (step A4, correction data creation processing). In the correction data creation processing (Step A4), at least one of white adjustment processing (Step A4a), color balance adjustment processing (Step A4b), and specific color adjustment processing (Step A4c) is performed.

In the white adjustment process (step A4a), the brightness of the white portion of the color adjustment image and the brightness of the white portion of the standard image are adjusted by focusing on the white portions of the color adjustment image and the standard image. In the color balance adjustment process (step A4b), the color balance of the same color adjustment image is adjusted so as to approach the color balance of the same standard image by focusing on the color balance of the entire color adjustment image and the entire standard image. In this case, at least one of luminance, hue, and saturation of red, green, and blue in the color adjustment image is adjusted. In the specific color adjustment process (step A4c), the specific color portion of the color adjustment image and the standard image (for example, a memory color such as flesh color or sky blue) is focused on and the specific color portion of the same color adjustment image It is adjusted so as to approach the specific color part. The correction data d is added to the video signal in, and the color of the color adjustment image displayed on the screen 50 is adjusted (step A5, color adjustment processing). After that, the division of the display area of the screen 50 is released, and an image corresponding to the color-adjusted video signal in is displayed on the screen 50.

As described above, in the first embodiment, the standard image board 60 is installed in the area J of the screen 50, and the color adjustment image on the area K of the screen 50 is set based on the standard image of the standard image board 60. Since the color adjustment is performed, even when the color of the screen 50 is deviated from white, the user operates the operation unit 43 to perform the color adjustment on the video signal in by a simple process.

FIG. 6 is a diagram showing a projection image display device and its surrounding environment for implementing a color adjustment method according to a second embodiment of the present invention, which is common to the elements in FIG. 1 showing the first embodiment. Are given the same reference numerals.
In the color adjustment method of this example, as shown in FIG. 6, a standard white plate 80 is used instead of the projected image display device 40A, the screen 50, and the standard image plate 60 having different configurations from the projected image display device 40 in FIG. Is done by being combined. The projected image display device 40A projects an image corresponding to a given video signal on the screen 50, and also projects separate images on the upper and lower or left and right regions of the display region of the screen 50, respectively.

The standard white plate 80 displays the standard image in a correct color when the standard image is projected from the projection image display device 40A via the standard image projection area R. The standard image includes, for example, at least one of white, red, green, blue, or a specific color (for example, flesh color, green of a plant, blue of the sky, and the like). In the area K of the screen 50, a color adjustment image having the same pattern as the standard image projected on the standard white plate 80 is projected from the projection image display device 40A via the color adjustment image projection area C. The user observes the standard image on the region J and the color adjustment image on the region K of the screen 50, and operates the projection image display device 40A based on the observation result, so that the same color adjustment image Adjust the color so that the colors are the same.

FIG. 7 is a block diagram showing an electrical configuration of the projection image display device 40A in FIG. 6, and components common to the components in FIG. 2 showing the first embodiment are denoted by the same reference numerals. .
In the projection image display device 40A, as shown in FIG. 7, instead of the internal image generation unit 41 and the screen division processing unit 45 in FIG. 2, an internal image generation unit 41A and a screen division processing unit 45A having different configurations are provided. Have been. The internal image generation unit 41A holds a standard image to be projected on the standard white plate 80 as an internal image in advance, and holds a color adjustment image to be projected on the area K of the screen 50 as an internal image in advance. . The screen division processing unit 45 </ b> A generates a color-adjusted image by adding correction data d to the image selected by the image switching unit 42, and generates a video signal P. The video signal P divides the display area of the screen 50 into two left and right areas J and K, projects the same color adjustment image on the area K of the screen 50, and projects a standard image on the area J of the screen 50. It is for.

8 shows an example of a standard image on the standard white plate 80 and an example of a color adjustment image on the area K of the screen 50, and FIG. 9 illustrates a color adjustment method used in the projection image display device 40A of FIG. It is a flowchart for the.
With reference to these figures, the processing content of the color adjustment method used in the projection image display device of this example will be described.
As shown in FIG. 8, the display area of the screen 50 is divided by the screen division processing unit 45 into two left and right areas J and K (step B1, area division processing). The standard white plate 80 is set on the area J of the screen 50, and a standard image is projected from the projection image display device 40 onto the standard white plate 80 (step B2, standard image projection processing). A color adjustment image having the same pattern as the standard image projected on the standard white plate 80 is projected from the projection image display device 40A onto the area K of the screen 50 (step B3, color adjustment image projection processing).

The operation unit 43 is operated based on the user's determination, and the correction data d for correcting the video signal in is subjected to the color correction processing so that the color adjustment image on the area K approaches the standard image on the standard white plate 80. It is created by the unit 44 (step B4, correction data creation processing). In the correction data creation processing (Step B4), at least one of white adjustment processing (Step B4a), color balance adjustment processing (Step B4b), and specific color adjustment processing (Step B4c) is performed.

In the white adjustment process (step B4a), the brightness of the white portion of the color adjustment image is adjusted so as to approach the brightness of the white portion of the standard image by focusing on each white portion of the color adjustment image and the standard image. In the color balance adjustment process (step B4b), the color balance of the same color adjustment image is adjusted so as to approach the color balance of the same standard image by focusing on the color balance of the entire color adjustment image and the entire standard image. In this case, at least one of luminance, hue, and saturation of red, green, and blue in the color adjustment image is adjusted. In the specific color adjustment processing (step B4c), a specific color portion of the color adjustment image and the standard image (for example, a memory color such as skin color or sky blue) is focused on and the specific color portion of the same color adjustment image is compared with the standard image. It is adjusted so as to approach the specific color part. The correction data d is added to the video signal in, and the color of the color adjustment image displayed on the screen 50 is adjusted (step B5, color adjustment processing). After that, the division of the display area of the screen 50 is released, and an image corresponding to the color-adjusted video signal in is displayed on the screen 50.

As described above, in the second embodiment, the standard white plate 80 is installed in the region J of the screen 50, and the color adjustment image on the region K of the screen 50 is set based on the standard image on the standard white plate 80. Therefore, even when the color of the screen 50 is deviated from white, the user operates the operation unit 43 to perform the color adjustment for the video signal in by a simple process.

FIGS. 10 to 15 are diagrams for explaining a color adjusting method according to a third embodiment of the present invention.
The color adjustment method of this example will be described with reference to these drawings and FIGS. 7 and 9 showing the second embodiment.
In the color adjustment method of this example, as shown in FIG. 10, the display area of the wall 90 is divided by the screen division processing unit 45 into two left and right areas J and K (step B1, area division processing). A standard white screen 50A is set on the area J of the wall 90, and a standard image is projected from the projection image display device 40 onto the screen 50A (step B2, standard image projection processing). A color adjustment image having the same pattern as the standard image projected on the screen 50A is projected from the projection image display device 40A onto the region K of the wall 90 (step B3, color adjustment image projection processing).

The operation unit 43 is operated based on the user's determination, and the correction data d for correcting the video signal in is corrected by the color correction processing unit 44 so that the color adjustment image on the area K approaches the standard image on the screen 50A. (Step B4, correction data creation processing). In the correction data creation processing (Step B4), at least one of white adjustment processing (Step B4a), color balance adjustment processing (Step B4b), and specific color adjustment processing (Step B4c) is performed.

In the white adjustment process (step B4a), as shown in FIG. 10, focusing on each white portion of the color adjustment image and the standard image, the brightness of the white portion of the same color adjustment image is reduced to the brightness of the white portion of the standard image. Adjusted to get closer. In the color balance adjustment processing (step B4b), as shown in FIG. 11, FIG. 12, FIG. 13, or FIG. 14, the color balance of the same color adjustment image is adjusted by paying attention to the color balance of the entire color adjustment image and the entire standard image. The adjustment is made so as to approach the color balance of the standard image. In this case, at least one of luminance, hue, and saturation of red, green, and blue in the color adjustment image is adjusted. In the specific color adjustment processing (step B4c), as shown in FIG. 15, the same color adjustment image is specified by focusing on a specific color (for example, a memory color such as skin color or sky blue) of the color adjustment image and the standard image. The color portion is adjusted so as to approach the specific color portion of the standard image. The correction data d is added to the video signal in, and the color of the color adjustment image displayed on the wall 90 is adjusted (step B5, color adjustment processing). Thereafter, the division of the display area of the wall 90 is released, and an image corresponding to the color-adjusted video signal in is displayed on the wall 90.

As described above, the third embodiment has almost the same advantages as the second embodiment.

FIG. 16 is a block diagram showing an electrical configuration of a projection image display device 40B for implementing a color adjustment method according to a fourth embodiment of the present invention. Elements in FIG. 7 showing the second embodiment. The common elements are denoted by the same reference numerals.
The projection image display device 40B of this example is provided in place of the projection image display device 40A in FIG. 6, and replaces the color correction processing unit 44 in FIG. 7 with color correction added with a new function. A processing unit 44A is provided, and a storage unit 46 is added. The storage unit 46 is configured by a RAM (Randam Access Memory), for example, and stores the first color space on the standard white plate 80 in advance. The color correction processing unit 44 </ b> A adjusts the color of the standard image projected on the standard white plate 80 in FIG. 6 so as to match the color of the color adjustment image projected on the area K of the screen 50. The second color space of the area K of the screen 50 is calculated based on the color of the standard image after the color adjustment, and the color is calculated between the first color space stored in the storage unit 46 and the second color space. The color appearance correction is constructed so that the appearances of the images match each other, and the color appearance correction is performed on the video signal in. The image for color adjustment includes at least one of white, red, green, blue, and black.

FIG. 17 is a flowchart illustrating a color adjustment method used in the projection image display device 40B, and FIGS. 18 and 19 are diagrams illustrating an example of a screen for performing color adjustment of a standard image.
The color adjustment method of this example will be described with reference to these drawings and FIG.
In the color adjustment method of this example, only W (white) is projected from the projection image display device 40B to the screen 50, and the R, G, B color information on the projection surface is obtained from the projected W (white) color information. By the estimation, the color characteristics of the projection image display device 40B represented by the following equation (1) are determined.
However,
O: a transformation matrix representing the color characteristics of the projection image display device 40B, and tristimulus values X, Y
, Z to R, G, B.
l, m, n: a correction term for correcting a black offset (black shift) (black offset; when black is projected by a projector, the display screen does not become completely black and a color shift occurs. This color shift is corrected)

That is, in order to obtain the color characteristics of the projection image display device 40B and the white information on the side of the projection image display device 40B, as shown in FIG. The (white) and Bk (black) images are projected onto the projection surface (the standard white plate 80 and the area K of the screen 50) (standard image projection processing and color adjustment image projection processing, step C1). The reflected light from the projection surface is manually adjusted by the operation unit 43 so that the color of the standard image (standard white plate 80) matches the color of the color adjustment image (region K), and the color correction processing unit 44A Generates tristimulus values X, Y, and Z of W (white) or W (white) / Bk (black) (color adjustment processing, step C2). In this case, the following equation (2) is used. The second color space of the area K of the screen 50 is calculated based on the color of the standard image after the color adjustment processing (second color space calculation processing). The first color space on the standard white plate 80 is stored in the storage unit 46 in advance (first color space storage processing).
However,
M: RGB → XYZ conversion matrix α, β, γ; correction term for considering black offset

(4) In the color adjustment processing, a GUI (Graphical User Interface) for adjusting the lightness, hue, and saturation of the color of the standard image is used. For example, as shown in FIG. 18, the hue and saturation in the reference image are adjusted using the hue / saturation adjustment scroll bar 82 in the color adjustment GUI 81, and the brightness adjustment GUI scroll bar 83 is used. Adjust the brightness of the color in the reference image. Further, the color adjustment is performed by using the red, green, blue, and white palettes and selecting a color in which the colors of the standard image and the color adjustment image are the same from the palette. For example, as shown in FIG. 19, a color is selected from a color palette 91 (for example, a palette whose basic color is red and whose hue, saturation, and brightness are changed little by little), and the color of the selected palette is displayed in a selected color. The color is adjusted by displaying it on the unit 92 and comparing it with the color of a wall color display unit 93 (for example, an image in which red is projected on a wall).

Here, the tristimulus values of white (W) are, for example, “XW2, YW2, ZW2”. It is determined whether the generated white information (ie, white tristimulus values) “XW2, YW2, ZW2” on the side of the projection image display device 40B is within a predetermined range (step C3). This predetermined range corresponds to the range in which the color correction is possible because the color correction becomes impossible when the saturation of the color of the wall is high. If the tristimulus values “XW2, YW2, ZW2” are within the above-mentioned predetermined range (YES in step C3), the chromaticity (wx, wy) of W (white) (the chromaticity coordinates in the xy chromaticity diagram) is calculated as R The chromaticities of (red), G (green), and B (blue) are estimated (step C4).

For example, the prediction formula for estimating the chromaticity (bx, by) of B (blue) is obtained by using multiple regression estimation. Bx = a ₁ wx + a ₂ wy + a ₀ (3)
by = b ₁ wx + b ₂ wy + b ₀ (4)
It is expressed as The coefficient a _i (i; 1, 2) is a variance / covariance matrix of the chromaticity wx and wy of W (white), and the covariance of the chromaticity bx of B (blue) and the chromaticity wx of W (white). It is calculated by the following equation (5) using the variance S _1y and the covariance S _2y of the chromaticity bx of B (blue) and the chromaticity wy of W (white). Note that the variance / covariance matrix of the chromaticity wx and wy of the W (white) is prepared in advance for projection planes of a plurality of colors, and for these projection planes, W (white) and W (white) of the projection image display device 40B are used. It is obtained by measuring the chromaticity on the projection surface when projecting the B (blue) image using a spectrophotometer or the like.
a ₀ = bx / − (wx / · a ₁ + wy / · a ₂ ) (5)
However,
S ₁ ; variance of chromaticity wx of W (white) S ₂ ; variance of chromaticity wy of W (white) S ₁₂ ; covariance of chromaticity wx and wy of W (white) bx /; B (blue) chromaticity bx average value wx /; W average wy / chromaticity wx (white); for mean coefficient b _i chromaticity wy of W (white) is also calculated similarly. Similarly, the chromaticities of R (red) and G (green) are estimated from the chromaticities wx and wy of W (white).

If the chromaticities of R, G, B, and W are obtained in this manner, the transformation matrix O in Expression (1) is easily calculated, and the color space on the side of the projection image display device 40B shown in Expression (1) is obtained. Is generated (step C5). Further, by using the tristimulus values X, Y, and Z of W (white) and Bk (black), the accuracy of the term of the black shift (l, n, m) in Expression (1) can be improved. Then, the color appearance correction for matching the color appearance between the first color space and the second color space is constructed using the XYZ → RGB conversion expression of Expression (1) (color appearance Correction construction processing, step C6). Then, color appearance correction is performed on the video signal (color appearance correction processing). Since the XYZ → RGB conversion formula is determined by actual measurement, more accurate and accurate color reproduction is realized in consideration of the environment in which the projection image display device 40B is installed. When the tristimulus values X, Y, and Z are out of the predetermined range in step C3, the user is notified (step C7).

As described above, in the fourth embodiment, color adjustment is performed so that the color of the standard image projected on the standard white plate 80 matches the color of the color adjustment image projected on the area K of the screen 50. The second color space of the area K of the screen 50 is calculated based on the color of the standard image after the color adjustment, and the first color space and the second color space stored in the storage unit 46 are calculated. Thus, the color appearance correction is constructed so that the color appearances match, and the color appearance correction is performed on the video signal in, so that the color adjustment for the video signal in is performed easily and with high accuracy. In addition, since the color adjustment GUI 81 and the color palette 91 are used for color adjustment, the operation is simplified.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment. Included in the invention.
For example, in FIGS. 4 and 8, the display area of the screen 50 may be divided into two upper and lower areas, and the positions of the standard image and the color adjustment image may be reversed. The position and size of these two regions may be arbitrary as long as the standard image and the color adjustment image can be compared. For example, as shown in FIG. 20 or FIG. 21, a part of the display area may be used. Further, the white adjustment process (step A4a), the color balance adjustment process (step A4b), and the specific color adjustment process (step A4c) in FIG. 5 may be performed in any order, and any one or two processes may be performed. You may go.

The image output unit 70 in FIG. 2 may be, for example, a single-panel projection liquid crystal projector or a DLP (Digital Light Processing) projector in addition to the three-panel projection liquid crystal projector. DLP is a projection type video display method developed by Texas Instruments of the United States. , And reflects the light of the light source to project an image on a screen.

In the first to third embodiments, a plurality of types of images corrected by color correction parameters (at least one of luminance, hue, and saturation of red, green, and blue) are prepared in advance, and an appropriate image is prepared. By selecting an image, the colors of the left and right images may be adjusted to match. In addition, in the third embodiment, the standard white screen 50A is installed on the area J of the wall 90. However, instead of the screen 50A, the standard image plate 60 in FIG. A color adjustment method similar to the embodiment may be performed. In the correction data creation processing (step A4) in FIG. 5 and the correction data creation processing (step B4) in FIG. 9, each scroll bar for color adjustment corresponding to each color is displayed on the screen. May be used to adjust the luminance, hue, or saturation. In the correction data creation processing (steps A4 and B4), a color palette for color adjustment corresponding to each color is displayed on the screen, and an appropriate color is selected from these color palettes to perform color adjustment. May be.

Further, in the first to third embodiments, a plurality of types of colors of the screen 50 are assumed, and a plurality of correction data corresponding to each of these colors are created in advance, and the same is used in the correction data creation process (steps A4 and B4). A color closest to the current color of the screen 50 may be selected from each color, and correction data corresponding to the selected color may be used. In this color selection, for example, luminance, hue, or saturation is selected using a scroll bar displayed on the screen, or a color palette is displayed on the screen, and an appropriate color is selected from these color palettes. There is a method such as selecting.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a projection image display device for implementing a color adjustment method according to a first embodiment of the present invention and a surrounding environment thereof. FIG. 2 is a block diagram illustrating an electrical configuration of a projection image display device 40 in FIG. 1. FIG. 3 is a configuration diagram illustrating an example of a video output unit 70 in FIG. 2. FIG. 5 is a diagram illustrating an example of a standard image on a standard image plate and an image for color adjustment on an area K of a screen 50; 3 is a flowchart illustrating a color adjustment method used in the projection image display device 40 of FIG. FIG. 7 is a diagram illustrating a projection image display device for implementing a color adjustment method according to a second embodiment of the present invention and a surrounding environment thereof. FIG. 7 is a block diagram illustrating an electrical configuration of a projection image display device 40 </ b> A in FIG. 6. FIG. 4 is a diagram illustrating an example of a standard image on a standard white plate and an image for color adjustment on an area K of a screen 50. 8 is a flowchart for explaining a color adjustment method used in the projection image display device 40A of FIG. FIG. 11 is a diagram illustrating a color adjustment method according to a third embodiment of the present invention. FIG. 11 is a diagram illustrating a color adjustment method according to a third embodiment of the present invention. FIG. 11 is a diagram illustrating a color adjustment method according to a third embodiment of the present invention. FIG. 11 is a diagram illustrating a color adjustment method according to a third embodiment of the present invention. FIG. 11 is a diagram illustrating a color adjustment method according to a third embodiment of the present invention. FIG. 11 is a diagram illustrating a color adjustment method according to a third embodiment of the present invention. FIG. 14 is a block diagram illustrating an electrical configuration of a projection image display device 40B for implementing a color adjustment method according to a fourth embodiment of the present invention. It is a flowchart explaining the color adjustment method used for the projection image display apparatus 40B. FIG. 7 is a diagram illustrating an example of a screen for performing color adjustment of a standard image. FIG. 7 is a diagram illustrating an example of a screen for performing color adjustment of a standard image. It is a figure showing a modification of two fields. It is a figure showing a modification of two fields. FIG. 9 is a diagram illustrating a projection image display device for implementing a conventional color adjustment method and its surrounding environment. 23 is a block diagram illustrating an electrical configuration of the projection image display device 10 in FIG.

Explanation of reference numerals

40, 40A, 40B Projection image display device 41, 41A Internal image generation unit 42 Image switching unit 43 Operation unit 44, 44A Color correction processing unit 45, 45A Screen division processing unit 46 Storage unit 50, 50A screen 60 Standard image plate 70 Video Output unit 80 Standard white plate 81 Color adjustment GUI
82 Scroll bar for hue / saturation adjustment 83 Scroll bar for brightness adjustment GUI 90 Wall 91 Color palette 92 Selected color display section 93 Wall color display section

Claims (8)

Used in a projection image display device that projects an image corresponding to a video signal on a screen or wall, and performs color adjustment of the image displayed on the screen or wall when the screen or wall is out of color from white. A color adjustment method,
An area dividing process of dividing all or a part of the display area of the screen or the wall into two areas;
A standard image plate on which a standard image displayed in a correct color is drawn when white light is projected from the projection image display device is installed on the area of one of the screen or the wall, and the projection image display device is provided. From the white image projection processing of projecting the white light to the standard image plate,
A color adjustment image projection process of projecting the same color adjustment image of the same pattern as the standard image drawn on the standard image plate from the projection image display device to the other area of the screen or wall,
Correction data creation processing for creating correction data for correcting the video signal so that the color adjustment image approaches the standard image,
A color adjustment method for adjusting the color of the color adjustment image displayed on the screen or the wall by adding the correction data to the video signal. Used in a projection image display device that projects an image corresponding to a video signal on a screen or wall, and performs color adjustment of the image displayed on the screen or wall when the screen or wall is out of color from white. A color adjustment method,
An area dividing process of dividing all or a part of the display area of the screen or the wall into two areas;
A standard white plate that is displayed in the correct color when a standard image is projected from the projection image display device is installed on the screen or one of the areas of the wall, and the standard white plate is projected from the projection image display device to the standard white plate. A standard image projection process for projecting a standard image,
A color adjustment image projection process for projecting the same color adjustment image as the standard image projected on the standard white plate from the projection image display device to the other area of the screen or wall,
Correction data creation processing for creating correction data for correcting the video signal so that the color adjustment image approaches the standard image,
A color adjusting process for adjusting a color of an image displayed on the screen or the wall by adding the correction data to the video signal. In the correction data creation process,
A white adjustment process for adjusting the white portion of the color adjustment image so as to approach the white portion of the standard image by focusing on each white portion of the color adjustment image and the standard image; the entire color adjustment image and the standard image A color balance adjustment process that adjusts the color balance of the color adjustment image so as to approach the color balance of the standard image by focusing on the entire color balance, or a specific color portion of the color adjustment image and the standard image. 3. The method according to claim 1, wherein at least one of specific color adjustment processes for adjusting a specific color portion of the color adjustment image so as to approach a specific color portion of the standard image is performed. Color adjustment method. The standard image is
4. The color adjustment method according to claim 1, wherein at least one of white, red, green, blue, and a specific color for use in the correction data creation processing is included. Used in a projection image display device that projects an image corresponding to a video signal on a screen or wall, and performs color adjustment of the image displayed on the screen or wall when the screen or wall is out of color from white. A color adjustment method,
A standard white plate that is displayed in a correct color when a standard image is projected from the projection image display device is installed on a partial area of the screen or a wall, and the standard white plate is projected from the projection image display device to the standard white plate. A standard image projection process for projecting a standard image,
A color adjustment image projection process of projecting the color adjustment image of the same pattern as the standard image projected on the standard white plate from the projection image display device to the screen or other area of the wall,
A color correction construction process for constructing color correction so that the color of the color adjustment image projected on the screen or the wall approaches the color of the standard image projected on the standard white plate,
Performing a color correction process for performing the color correction on the video signal. In the color correction construction process,
A first color space storage process for storing a first color space on the standard white plate in advance;
Color adjustment processing for adjusting the color of the standard image to match the color of the color adjustment image,
A second color space calculation process of calculating a second color space of the other area of the screen or the wall based on the color of the standard image after the color adjustment process;
A color appearance correction construction process for constructing a color appearance correction so that the color appearances in the first color space and the second color space match;
6. The color adjustment method according to claim 5, further comprising performing a color appearance correction process for applying the color appearance correction to the video signal. The standard image and the image for color adjustment,
7. The color adjustment method according to claim 5, wherein at least one of white, red, green, blue, and black is included. In the color adjustment processing,
7. The color adjustment method according to claim 6, wherein a GUI (Graphical User Interface) for adjusting lightness, hue, and saturation of the color of the standard image is used.

Images