JP2004072760A5 - - Google Patents

Description

Projector and color adjustment method thereof

The present invention relates to a projector and a color adjustment method thereof , and more particularly to a projector and a color adjustment method suitable for a case where a screen or a wall on which an image is projected is discolored from white.

  An image projected from a projection image display device such as a liquid crystal projector is displayed on a screen or a wall, but the color of the screen or the wall is not necessarily white at the time of use, 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, a color adjustment method used in this type of projection image display device (projector) includes a combination of a projection image display device 10 and a screen 20 as shown in FIG. This is performed by observing the image 30 and 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 on the operation unit 11 by the user M. 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-mentioned 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-mentioned problem, the invention according to claim 1 relates to a method for adjusting a color of a projection image of a projector on a projection surface, wherein a standard image is provided on a first area of the projection surface. Placing a plate, projecting white light on the standard image plate, projecting an image on a second area of the projection surface, and changing the color of the image projected on the second area to Correcting the color so as to approach the color of the standard image.

According to a second aspect of the present invention, there is provided the color adjusting method according to the first aspect, wherein the standard image plate displays the standard image in a correct color when white light is projected.

The invention according to claim 3 relates to a method of adjusting a color of a projection image of a projector on a projection surface, wherein a step of placing a white plate on a first area of the projection surface, Projecting, projecting an image on a second area of the projection surface, and correcting the color of the image projected on the second area to approach the color of the standard image, It is characterized by including.

According to a fourth aspect of the present invention, there is provided the color adjusting method according to the third aspect, wherein the standard image projected on the white plate is displayed in a correct color.

The invention according to claim 5 relates to the color adjusting method according to claim 2 or 4, wherein the standard image includes red, green, and blue.

The invention according to claim 6 relates to the color adjusting method according to claim 2, 4 or 5, wherein the standard image includes white.

According to a seventh aspect of the present invention, there is provided the color adjusting method according to the second, fourth, fifth, or sixth aspect, wherein the standard image includes a specific color.

The invention according to claim 8 relates to the color adjustment method according to claim 6, wherein the color of the white portion of the image projected on the second area is close to the color of the white portion of the standard image. It is characterized by including the step of performing.

According to a ninth aspect of the present invention, there is provided the color adjusting method according to the second aspect, wherein the color balance of the image projected on the second area is equal to the color balance of the standard image. The method is characterized by including a step of adjusting the distance to approach.

According to a tenth aspect of the present invention, in the color adjusting method according to the seventh aspect, a step of adjusting the specific color portion of the image projected on the second area so as to approach the specific color portion of the standard image. It is characterized by including.

The invention according to claim 11 relates to a method for adjusting a color of a projection image of a projector on a projection surface, wherein a white plate is placed on a first area of the projection surface, and a standard image is projected on the white plate. Projecting an image on a second area of the projection surface, correcting the color of the standard image to approach the color of the image projected on the second area, Correcting the color of the image projected on the second area based on the corrected information of the color of the image.

According to a twelfth aspect of the present invention, there is provided the color adjusting method according to the eleventh aspect, wherein the standard image projected on the white plate is displayed in a correct color. I have.

According to a thirteenth aspect of the present invention, there is provided the color adjusting method according to the twelfth aspect, wherein the standard image includes red, green, and blue.

The invention according to claim 14 relates to the color adjusting method according to claim 12 or 13, wherein the standard image includes white.

According to a fifteenth aspect of the present invention, in the color adjusting method according to the twelfth aspect, the standard image includes a specific color.

According to a sixteenth aspect of the present invention, in the color adjusting method according to the sixth or fourteenth aspect, the color of the white portion of the standard image approaches the color of the white portion of the image projected on the second area. It is characterized by including the step of adjusting to.

According to a seventeenth aspect of the present invention, there is provided the color adjusting method according to the eleventh, twelfth, thirteenth, fourteenth, or fifteenth aspect, wherein the color balance of the standard image approaches the color balance projected on the second area. It is characterized by including a step of adjusting.

According to an eighteenth aspect of the present invention, there is provided the color adjusting method according to the fifteenth aspect, further comprising the step of adjusting the specific color portion of the standard image so as to approach the specific color portion projected on the second area. It is characterized by.

The invention according to claim 19 relates to a projector for projecting an image on a projection surface, comprising: an operation unit operated by a user; and a video output unit for projecting an image on the projection surface, wherein the image to be projected is stored in a first area. Divided into an area and a second area, projecting white light on the first area, projecting an image on the second area, and setting the second area based on information input to the operation unit. Is characterized in that the color of the image projected on the area is corrected.

The invention according to claim 20 relates to the projector according to claim 19, wherein the image projected on the second area has a white portion, and the image projected on the second area has a white color. When information is input to the operation unit so that the color of the white part approaches the color of the white part of the standard image plate on which the standard image placed in the first area is placed, the second area The color of the image projected on the image is corrected.

According to a twenty-first aspect of the present invention, there is provided the projector according to the nineteenth aspect, wherein a color balance of the image projected on the second region is a standard image of a standard image placed on the first region. The color of the image projected on the second area is corrected when information is input to the operation unit so as to approach a color balance.

The invention according to claim 22 relates to the projector according to claim 19, wherein the image projected on the second area has a specific color portion, and the image projected on the second area is When information is input to the operation unit such that the color of the specific color portion approaches the color of the specific color portion of the standard image plate on which the standard image placed in the first area is placed, The color of the image projected on the second area is corrected.

The invention according to claim 23 relates to a projector for projecting an image on a projection surface, comprising: an operation unit operated by a user; and a video output unit for projecting an image on the projection surface, wherein the image to be projected is stored in a first area. Divided into a second area and a second area, a standard image is projected on the first area, an image is projected on the second area, and the second image is projected on the basis of information input to the operation unit. Is characterized in that the color of the image projected on the area is corrected.

The invention according to claim 24 is directed to the projector according to claim 23, wherein the standard image projected on the first area has a white portion, and the image projected on the second area is a white portion. And the color of the white portion of the image projected on the second region approaches the color of the white portion of the standard image projected on a white plate placed on the first region. As described above, when information is input to the operation unit, the color of the image projected on the second area is corrected.

The invention according to claim 25 is directed to the projector according to claim 23, wherein the color balance of the image projected on the second area is projected on a white plate placed on the first area. When information is input to the operation unit, the color of the image projected on the second area is corrected so as to approach the color balance of the standard image.

According to a twenty-sixth aspect of the present invention, in the projector according to the twenty-third aspect, the standard image projected on the first area has a specific color portion, and the image projected on the second area is The specific color of the standard image projected on a white plate placed in the first region, wherein the specific color portion of the image projected on the second region has a specific color portion. When information is input to the operation unit so as to approach the color of the portion, the color of the image projected on the second area is corrected.

The invention according to claim 27 relates to a projector for projecting an image on a projection surface, comprising: an operation unit operated by a user; and a video output unit for projecting an image on the projection surface. Dividing into a first area and a second area, projecting a standard image on the first area, projecting an image on the second area, and setting the standard image based on information input to the operation unit. The image can be corrected, and the color of the image projected on the second area is corrected based on information obtained by correcting the standard image.

The invention according to claim 28 relates to the projector according to claim 27, wherein the standard image projected on the first area has a white portion, and the image projected on the second area has a white portion. And the color of the white portion of the standard image projected on the white plate placed in the first region approaches the color of the white portion of the image projected on the second region As described above, when information is input to the operation unit, the color of the image projected on the second area is corrected.

According to a twenty-seventh aspect of the present invention, in the projector according to the twenty-seventh aspect, the color balance of the standard image projected on the white plate placed in the first area is projected on the second area. The apparatus is characterized in that the color of the image projected on the second area is corrected when information is input to the operation unit so as to approach the color balance of the image.

The invention according to claim 30 relates to the projector according to claim 27, wherein the standard image projected on the first area has a specific color portion, and the image projected on the second area is identified. The specific color portion of the image, wherein the specific color portion of the standard image projected on the white plate placed in the first region has a color portion and the color of the specific color portion projected on the second region; The color of the image projected on the second area is corrected when information is input to the operation unit so as to approach the color of the image.

  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.

  Provided is a projector that allows a user to easily perform color adjustment even when a screen or a wall has a color shift from white, and a color adjustment method thereof.

FIG. 1 is a diagram showing a projection image display device (projector) 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, 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 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 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 and the white portion of the standard image are adjusted so as to approach the brightness of the white portion of the standard image by focusing on the white portions 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 substantially 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.

ただし、
Ｏ；投射画像表示装置４０Ｂの色特性を表す変換行列であり、三刺激値Ｘ，Ｙ
，ＺからＲ，Ｇ，Ｂへ変換する。
ｌ，ｍ，ｎ；ブラックオフセット（ブラックシフト）などを補正するための補正項（ブ
ラックオフセット；プロジェクタで黒を投射したとき、表示画面は完全な
黒にはならず、色ずれが生じるが、この色ずれを補正するものである） 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 black offset (black shift)
Rack offset; When projecting black with a projector, the display screen is completely
The color shift occurs without being black, but this color shift is corrected.)

ただし、
Ｍ；ＲＧＢ→ＸＹＺ変換行列
α，β，γ；ブラックオフセットを考慮するための補正項 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

  The color adjustment process uses a GUI (Graphical User Interface) for adjusting the brightness, hue, and saturation of the color of the standard image. 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 white (W) tristimulus values 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).

ａ₀＝ｂｘ/ −（ｗｘ/ ・ａ₁＋ｗｙ/ ・ａ₂） ・・・（５）
ただし、
Ｓ₁；Ｗ（白）の色度ｗｘの分散
Ｓ₂；Ｗ（白）の色度ｗｙの分散
Ｓ₁₂；Ｗ（白）の色度ｗｘとｗｙとの共分散
ｂｘ/ ；Ｂ（青）の色度ｂｘの平均値
ｗｘ/ ；Ｗ（白）の色度ｗｘの平均値
ｗｙ/ ；Ｗ（白）の色度ｗｙの平均値
係数ｂ_iについても，同様に計算される。同様にして、Ｒ（赤）及びＧ（緑）の色度についても、Ｗ（白）の色度ｗｘ，ｗｙから推定される。 For example, a prediction equation 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 : dispersion of chromaticity wx of W (white)
S ₂ : dispersion of chromaticity wy of W (white)
S ₁₂ : Covariance of chromaticity wx and wy of W (white)
bx /; average value of chromaticity bx of B (blue)
wx /; average value of chromaticity wx of W (white)
wy /; W for the average value coefficients b _i of the chromaticity wy (white), is calculated in the same manner. 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 video output unit 70 in FIG. 2 may be a single-panel projection liquid crystal projector, a DLP (Digital Light Processing) projector, or the like, in addition to a 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 correction data creation processing (steps A4 and B4) performs the same processing. 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.

FIG. 1 is a diagram illustrating a projection image display device (projector) for implementing a color adjustment method according to a first embodiment of the present invention and a peripheral 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 (30)

A method for adjusting a color of a projected image of a projector on a projection surface,
Placing a standard image plate on which a standard image is placed in a first area of the projection surface;
Projecting white light on the standard image plate;
Projecting an image on a second area of the projection surface;
Correcting the color of the image projected on the second area to approach the color of the standard image;
A color adjustment method comprising: 2. The color adjusting method according to claim 1, wherein the standard image plate displays the standard image in a correct color when white light is projected. A method for adjusting a color of a projected image of a projector on a projection surface,
Placing a white plate on a first area of the projection surface;
Projecting a standard image on the white plate;
Projecting an image on a second area of the projection surface;
Correcting the color of the image projected on the second area to approach the color of the standard image;
A color adjustment method comprising: The color adjusting method according to claim 3, wherein the standard image projected on the white plate is displayed in a correct color. The color adjustment method according to claim 2, wherein the standard image includes red, green, and blue. 6. The color adjustment method according to claim 2, wherein the standard image includes white. 7. The color adjusting method according to claim 2, wherein the standard image includes a specific color. 7. The color adjusting method according to claim 6, further comprising a step of adjusting a color of a white portion of the image projected on the second area to be close to a color of a white portion of the standard image. 8. The method according to claim 1, further comprising: adjusting a color balance of the image projected on the second area so as to approach a color balance of the standard image. How to adjust the colors described. 8. The color adjustment method according to claim 7, further comprising the step of adjusting the specific color portion of the image projected on the second area so as to approach the specific color portion of the standard image. A method for adjusting a color of a projected image of a projector on a projection surface,
Placing a white plate on a first area of the projection surface;
Projecting a standard image on the white plate;
Projecting an image on a second area of the projection surface;
Correcting the color of the standard image to approach the color of the image projected on the second area;
Correcting the color of the image projected on the second area based on information obtained by correcting the color of the standard image;
A color adjustment method comprising: The color adjusting method according to claim 11, wherein the standard image projected on the white plate is displayed in a correct color. 13. The color adjustment method according to claim 12, wherein the standard image includes red, green, and blue. 14. The color adjustment method according to claim 12, wherein the standard image includes white. 15. The color adjustment method according to claim 12, wherein the standard image includes a specific color. 15. The color adjusting method according to claim 6, further comprising a step of adjusting a color of a white portion of the standard image so as to approach a color of a white portion of the image projected on the second area. . 16. The color adjusting method according to claim 11, further comprising the step of adjusting the color balance of the standard image so as to approach the color balance projected on the second area. 16. The color adjustment method according to claim 15, further comprising a step of adjusting the specific color portion of the standard image so as to approach the specific color portion projected on the second area. A projector that projects an image on a projection surface,
An operation unit operated by a user,
A video output unit that projects an image on the projection surface,
Dividing an image to be projected into a first area and a second area,
Projecting white light onto the first area;
Projecting an image on the second area,
A projector configured to correct a color of the image projected on the second area based on information input to the operation unit. The image projected on the second area has a white portion, and
The operation unit is configured such that the color of the white portion of the image projected on the second region approaches the color of the white portion of the standard image plate on which the standard image placed on the first region is applied. 20. The projector according to claim 19, wherein a color of the image projected on the second area is corrected when information is input. When information is input to the operation unit so that the color balance of the image projected on the second area approaches the color balance of a standard image placed on a standard image board placed in the first area. 20. The projector according to claim 19, wherein a color of the image projected on the second area is corrected. The image projected on the second area has a specific color portion, and
The operation is performed such that the color of the specific color portion of the image projected on the second region approaches the color of the specific color portion of the standard image plate on which the standard image placed on the first region is applied. 20. The projector according to claim 19, wherein a color of the image projected on the second area is corrected when information is input to the unit. A projector that projects an image on a projection surface,
An operation unit operated by a user,
A video output unit that projects an image on the projection surface,
Dividing an image to be projected into a first area and a second area,
Projecting a standard image on the first area,
Projecting an image on the second area,
A projector configured to correct a color of the image projected on the second area based on information input to the operation unit. The standard image projected on the first area has a white portion;
The image projected on the second area has a white portion, and
The operation unit so that a color of the white portion of the image projected on the second region approaches a color of the white portion of the standard image projected on a white plate placed on the first region. 24. The projector according to claim 23, wherein the color of the image projected on the second area is corrected when information is input to the projector. Information is input to the operation unit such that the color balance of the image projected on the second area approaches the color balance of the standard image projected on the white plate placed on the first area. 24. The projector according to claim 23, wherein a color of the image projected on the second area is corrected at the time. The standard image projected on the first area has a specific color portion,
The image projected on the second area has a specific color portion, and
As the color of the specific color portion of the image projected on the second region approaches the color of the specific color portion of the standard image projected on the white plate placed in the first region, 24. The projector according to claim 23, wherein a color of the image projected on the second area is corrected when information is input to the operation unit. A projector that projects an image on a projection surface,
An operation unit operated by a user,
A video output unit that projects an image on the projection surface,
Dividing an image to be projected into a first area and a second area,
Projecting a standard image on the first area,
Projecting an image on the second area,
The standard image can be corrected based on the information input to the operation unit, and the color of the image projected on the second area is corrected based on the corrected information of the standard image. Projector. The standard image projected on the first area has a white portion;
The image projected on the second area has a white portion, and
The operation unit so that the color of the white part of the standard image projected on the white plate placed in the first area approaches the color of the white part of the image projected on the second area. 28. The projector according to claim 27, wherein when information is input to the projector, the color of the image projected on the second area is corrected. Information is input to the operation unit such that the color balance of the standard image projected on the white plate placed in the first area approaches the color balance of the image projected on the second area. 28. The projector according to claim 27, wherein a color of the image projected on the second area is corrected at the time. The standard image projected on the first area has a specific color portion,
The image projected on the second area has a specific color portion, and
As the color of the specific color portion of the standard image projected on the white plate placed in the first region approaches the color of the specific color portion of the image projected on the second region, 28. The projector according to claim 27, wherein a color of the image projected on the second area is corrected when information is input to the operation unit.