JP3776899B2 - Projector and its color adjustment method - Google Patents

Description

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

  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 wall is not necessarily the initial white color when used, for example, yellow or blue. It may be off. When 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 appear to the original color to the user. It is necessary to perform color adjustment on the projected image.

Conventionally, a color adjustment method used for this kind of projection image display device (projector) is a combination of the projection image display device 10 and the 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 apparatus 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 a key switch 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 the video signal in supplied from the outside based on the operation of the user M on the operation unit 11. The output signal processing unit 13 generates the color-adjusted video signal P by adding correction data d to the video signal in. The video output unit 14 is composed of, for example, a three-plate projection type liquid crystal display device, and splits white light generated from a light source into red (R), green (G), and blue (B) primary light, and the respective primary colors. After the light is modulated in accordance with the video signal P, the light is synthesized 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 is deviated 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), and the like are performed, and adjustment is performed to improve the appearance.

  At present, there is no appropriate prior art document information related to the above-described conventional technology.

However, the color adjustment method used in the conventional projection image display apparatus has the following problems.
That is, in the conventional color adjustment method, the user M observes the color of the projection image 30 and the adjustment is performed based on the subjective judgment of the user M 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 described in claim 1 relates to a method for adjusting a color on a projection surface of a projection image of a projector, and a standard image in which a standard image is written in a first area of the projection surface. A step of placing a plate, a step of projecting white light on the standard image plate, a step of projecting an image on a second region of the projection surface, and a color of the image projected on the second region And a step of correcting so as to approach the color of the standard image.

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

According to a third aspect of the present invention, there is provided a method for adjusting a color on a projection surface of a projection image of a projector, a step of placing a white plate in a first area of the projection surface, and a standard image on the white plate. Projecting, projecting an image on the second area of the projection surface, and correcting the color of the image projected on the second area so as to approach the color of the standard image. It is characterized by including.

A fourth aspect of the present invention relates to the color adjustment method according to the third aspect, wherein the white plate displays the standard image projected thereon in a correct color.

According to a fifth aspect of the present invention, in the color adjustment method according to the second or fourth aspect, the standard image includes red, green, or blue.

According to a sixth aspect of the present invention, in the color adjustment method according to the second, fourth, or fifth aspect, the standard image includes white.

A seventh aspect of the invention relates to the color adjustment method of 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 adjusted to approach the color of the white portion of the standard image. It is characterized by including the process to perform.

A ninth aspect of the invention relates to the color adjustment method according to the second, fourth, fifth, sixth or seventh aspect, wherein the color balance of the image projected on the second region is the color balance of the standard image. It is characterized by including the process of adjusting so that it may approach.

According to a tenth aspect of the present invention, in the color adjustment method according to the seventh aspect, the step of adjusting the specific color portion of the image projected on the second area 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 of adjusting a color on a projection surface of a projection image of a projector, a step of placing a white plate on a first area of the projection surface, and a standard image is projected onto the white plate. A step of projecting an image on a second area of the projection surface, a step of correcting the color of the standard image so as to approach the color of the image projected on the second area, and the standard image And a step of correcting the color of the image projected on the second region based on the information obtained by correcting the color of the image.

The invention described in claim 12 relates to the color adjustment method described in claim 11, wherein the white plate displays the standard image projected thereon in a correct color. Yes.

A thirteenth aspect of the present invention relates to the color adjustment method according to the twelfth aspect of the present invention, wherein the standard image includes red, green, or blue.

According to a fourteenth aspect of the present invention, in the color adjustment method according to the twelfth or thirteenth aspect, the standard image includes white.

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

A sixteenth aspect of the invention relates to the color adjustment method according to the sixth or fourteenth aspect, wherein the color of the white portion of the standard image approaches the color of the white portion of the image projected on the second region. It is characterized by including the process of adjusting to.

The invention described in claim 17 relates to the color adjustment method described in claim 11, 12, 13, 14, or 15, so that 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.

The invention according to claim 18 relates to the color adjustment method according to claim 15, and includes a step of adjusting the specific color portion of the standard image so as to approach the specific color portion projected on the second region. It is characterized by.

According to a nineteenth aspect of the present invention, there is provided a projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface . While projecting white light on a standard image plate placed in one area and projecting an adjustment image having a white portion in the second area, the information is input from the operation unit, Based on the correction information for bringing the color of the white portion of the adjustment image projected onto the area of the image closer to the color of the white portion of the standard image applied to the standard image plate of the first area, It is characterized in that color adjustment means for adjusting the color of the adjustment image projected on the second area is added .

The invention according to claim 20 relates to a projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface. While projecting white light onto the standard image plate placed in the area, the adjustment image is projected onto the second area , and information input from the operation unit is projected onto the second area. wherein the color balance adjustment image, based on the correction information for morning Konzuke the color balance of the first standard image wherein are Kakare the standard image plate area, is projected on the second region color adjusting means for adjusting the color of the adjustment image is characterized in that is is added.

A twenty- first aspect of the invention relates to a projector including an operation unit operated by a user and a video output unit for projecting an image on a projection surface. While projecting white light on a standard image plate placed in the area, the image for adjustment having a specific color portion is projected on the second area, and information inputted from the operation unit, the second image the color of the specific color portion of the adjustment image projected on the area, the correction information for morning Konzuke the color of the specific color portion of the standard image are Kakare the standard image plate of said first region Based on this, color adjusting means for adjusting the color of the adjustment image projected on the second area is added .

A twenty-second aspect of the invention relates to a projector including an operation unit operated by a user and a video output unit that projects an image onto a projection surface . While projecting a standard image having a white portion on a white plate placed in a region , while projecting an adjustment image having a white portion in a second region, information input from the operation unit, Based on the correction information for bringing the color of the white portion of the adjustment image projected onto the area of 2 closer to the color of the white portion of the standard image projected onto the white plate of the first area A color adjusting means for adjusting the color of the adjustment image projected on the second area is added .

The invention described in claim 23 relates to a projector having an operation unit operated by a user and a video output unit for projecting an image on the projection surface. While projecting the standard image on the white plate placed in the area, the adjustment image is projected on the second area , and the information is input from the operation unit, and is projected on the second area. the color balance adjustment image, on the basis of the correction information for morning Konzuke the color balance of the projected the standard image in the white plate in the first region is projected on the second region and the It is characterized in that color adjustment means for adjusting the color of the adjustment image is added .

According to a twenty-fourth aspect of the present invention, there is provided a projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface. While projecting a standard image having a specific color part on a white plate placed in the area, while projecting an adjustment image having a specific color part in the second area, information input from the operation unit, the color of the specific color portion of the adjustment image projected on the second region and morning Konzuke the color of the specific color portion of the projected the standard image in the white plate of said first region Therefore, color adjustment means for adjusting the color of the adjustment image projected on the second area is added based on the correction information for this purpose .

The invention described in claim 25 relates to a projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface . While projecting a standard image having a white portion on a white plate placed in a region, while projecting an adjustment image having a white portion in a second region, information input from the operation unit, Based on correction information for bringing the color of the white portion of the standard image projected onto the white plate in one region closer to the color of the white portion of the adjustment image projected onto the second region A color adjusting means for adjusting the color of the adjustment image projected on the second area is added .

According to a twenty-sixth aspect of the present invention, there is provided a projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface. while projecting the standard image in the white plate placed in the area, as well as projects the adjustment image in the second area is information inputted from the operation unit, the white plate of said first region the color balance of the projected the standard image, on the basis of the correction information for morning Konzuke the color balance of the adjustment image projected on the second region, is projected on the second region and the It is characterized in that color adjustment means for adjusting the color of the adjustment image is added .

A twenty-seventh aspect of the present invention relates to a projector including an operation unit operated by a user and a video output unit that projects an image on a projection surface. While projecting a standard image having a specific color part on a white plate placed in the area, while projecting an adjustment image having a specific color part in the second area, information input from the operation unit, the color of the specific color portion has been the standard image projected on the white plate of said first region and morning Konzuke the color of the specific color portion of the adjustment image projected on the second region Therefore, color adjustment means for adjusting the color of the adjustment image projected on the second area is added based on the correction information for this purpose .

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

  Also, color adjustment is performed so that the color of the standard image projected on the standard white plate matches 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. Based on the color, the second color space of the other area of the screen is calculated, and the color appearance correction is performed so that the color appearance matches between the stored first color space and the second color space. Since it is constructed and color appearance correction is performed on the video signal, color adjustment for 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 is out of color from white, and a color adjustment method thereof.

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

  The screen 50 is shifted in color from white at the initial use to yellow or blue due to, for example, aging. The standard image board 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. This standard image includes, for example, at least one of white, red, green, blue, or a specific color (for example, skin color, plant green, sky blue, etc.). A color adjustment image having the same pattern as that of the standard image drawn on the standard image board 60 is projected onto the area K of the screen 50 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 of the screen 50 and the color adjustment image on the area K, 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 same hue is achieved.

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 in advance a color adjustment image to be projected onto the area K of the screen 50 as an internal image. In particular, in this embodiment, the internal image generation unit 41 is the same as the standard image drawn on the standard image board 60. A picture color adjustment image is generated. The image switching unit 42 selects and switches the video signal in corresponding to the image held as the internal image in the internal image generation unit 41 or the user's favorite image based on the user's 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 operation on the operation unit 43. The screen division processing unit 45 adds the correction data d to the image selected by the image switching unit 42 to generate a color-adjusted image and generate the video signal P. The video signal P divides the display area of the screen 50 into two areas J and K on the left and right sides, projects the same color adjustment image onto the area K of the screen 50, and emits white light to the area J (standard image) of the screen 50. For projection onto the plate 60). The video output unit 70 is composed of, for example, a three-plate projection type liquid crystal display device, and splits white light generated from the light source into red (R), green (G), and blue (B) primary color lights, and the respective primary colors. The light is modulated in accordance with the video signal P output from the screen division processing unit 45, and then combined with additive color mixture and projected onto the screen 20.

FIG. 3 is a block diagram showing an example of the video output unit 70 in FIG.
As shown in FIG. 3, the video output unit 70 is a three-plate projection type liquid crystal projector, and includes a lamp 71, a reflector 72, an interference filter 73, dichroic mirrors 74 and 75, and mirrors 76 and 77, 78, liquid crystal light valves 79, 7A and 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 light by the dichroic mirrors 74 and 75, and each primary color light is converted into the video signal P. Are modulated (transmitted or shielded by the liquid crystal light valves 79, 7A and 7B), synthesized by the dichroic prism 7C, and projected onto the screen 50 from the projection lens 7D.

FIG. 4 is a diagram showing an example of a standard image on the standard image board 60 and a color adjustment image on the area K of the screen 50, and FIG. 5 explains a color adjustment method used in the projection image display device 40 of FIG. It is a flowchart for.
The processing contents of the color adjustment method used in the projection image display apparatus of this example will be described with reference to these drawings.
As shown in FIG. 4, the display area of the screen 50 is divided into two left and right areas J and K by the screen division processing unit 45 (step A1, area division processing). The standard image board 60 is installed on the area J of the screen 50, and white light is projected from the projection image display device 40 onto the standard image board 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).

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

  In the white adjustment process (step A4a), attention is paid to the white portions of the color adjustment image and the standard image, and the brightness of the white portion of the same color adjustment image is adjusted to approach the brightness of the white portion of the standard image. In the color balance adjustment process (step A4b), the color balance of the color adjustment image is adjusted so as to approach the color balance of the standard image by paying attention to the color balance of the whole color adjustment image and the whole standard image. In this case, at least one of the luminance, hue, and saturation of red, green, and blue in the color adjustment image is adjusted. In the specific color adjustment process (step A4c), focusing on the color adjustment image and the specific color (for example, the memory color such as skin color and sky blue) of the standard image, the specific color portion of the same color adjustment image It is adjusted 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). Thereafter, the division of the display area of the screen 50 is canceled, 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 with reference to the standard image of the standard image board 60. Since the color adjustment is performed, even when the screen 50 is deviated from white color, the user can operate the operation unit 43 to perform the color adjustment for the video signal in by a simple process.

FIG. 6 is a diagram showing a projection image display apparatus for implementing a color adjustment method according to a second embodiment of the present invention and its surrounding environment, and is common to the elements in FIG. 1 showing the first embodiment. These elements are denoted by common reference numerals.
In the color adjustment method of this example, as shown in FIG. 6, a standard white plate 80 instead of the projection image display device 40 </ b> A, the screen 50, and the standard image plate 60 having a configuration different from that of the projection image display device 40 in FIG. 1. Is done by combining. The projected image display device 40A projects an image corresponding to a given video signal onto the screen 50, and projects separate images on the upper and lower or left and right areas of the display area of the screen 50, respectively.

  The standard white plate 80 displays the standard image in the correct color when the standard image is projected from the projection image display device 40A through the standard image projection area R. This standard image includes, for example, at least one of white, red, green, blue, or a specific color (for example, skin color, plant green, sky blue, etc.). A color adjustment image having the same pattern as that of the standard image projected on the standard white plate 80 is projected onto the area K of the screen 50 from the projection image display device 40A through the color adjustment image projection area C. The user observes the standard image on the area J of the screen 50 and the color adjustment image on the area K, and operates the projection image display device 40A 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 same hue is achieved.

FIG. 7 is a block diagram showing an electrical configuration of the projection image display device 40A in FIG. 6. Elements common to those in FIG. 2 showing the first embodiment are given common reference numerals. .
In the projection image display device 40A, as shown in FIG. 7, an internal image generation unit 41A and a screen division processing unit 45A having different configurations are provided in place of the internal image generation unit 41 and the screen division processing unit 45 in FIG. It has been. The internal image generation unit 41A holds a standard image for projection on the standard white plate 80 as an internal image in advance, and holds a color adjustment image for projection onto the area K of the screen 50 as an internal image in advance. . The screen division processing unit 45A adds the correction data d to the image selected by the image switching unit 42, thereby generating a color-adjusted image and generating the video signal P. The video signal P divides the display area of the screen 50 into two left and right areas J and K, and projects the same color adjustment image onto the area K of the screen 50 and also projects the standard image onto the area J of the screen 50. Is for.

FIG. 8 shows an example of a standard image on the standard white plate 80 and an image for color adjustment on the area K of the screen 50, and FIG. 9 explains a color adjustment method used in the projection image display device 40A of FIG. It is a flowchart for.
The processing contents of the color adjustment method used in the projection image display apparatus of this example will be described with reference to these drawings.
As shown in FIG. 8, the display area of the screen 50 is divided into two left and right areas J and K by the screen division processing unit 45 (step B1, area division processing). The standard white plate 80 is installed 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). The 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).

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

  In the white adjustment process (step B4a), attention is paid to the white portions of the color adjustment image and the standard image, and the brightness of the white portion of the same color adjustment image is adjusted to approach the brightness of the white portion of the standard image. In the color balance adjustment process (step B4b), attention is paid to the color balance of the entire color adjustment image and the entire standard image, and the color balance of the same color adjustment image is adjusted to approach the color balance of the standard image. In this case, at least one of the luminance, hue, and saturation of red, green, and blue in the color adjustment image is adjusted. In the specific color adjustment process (step B4c), focusing on the color adjustment image and the specific color (for example, the memory color such as skin color and sky blue) of the standard image, the specific color portion of the same color adjustment image It is adjusted 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). Thereafter, the division of the display area of the screen 50 is canceled, 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 area J of the screen 50, and the color adjustment image on the area K of the screen 50 with the standard image on the standard white plate 80 as a reference. Therefore, even if the screen 50 is deviated from white color, the user can operate the operation unit 43 to perform color adjustment on the video signal in by simple processing.

10 to 15 are diagrams for explaining a color adjustment 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 into two left and right areas J and K by the screen division processing unit 45 (step B1, area division processing). A standard white screen 50A is installed 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).

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

  In the white adjustment process (step B4a), as shown in FIG. 10, paying attention to each white part of the color adjustment image and the standard image, the brightness of the white part of the same color adjustment image is changed to the brightness of the white part of the standard image. Adjusted to approach. In the color balance adjustment process (step B4b), as shown in FIGS. 11, 12, 13, or 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. Adjustments are made to approach the color balance of the standard image. In this case, at least one of the 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 color adjustment image and the standard image are specified by paying attention to specific color portions (for example, memory colors such as skin color and sky blue) of 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 canceled, 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 the electrical configuration of a projection image display apparatus 40B for carrying out the color adjustment method according to the fourth embodiment of the present invention, and the elements in FIG. 7 showing the second embodiment. Common elements are denoted by common 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 color correction with a new function added in place of the color correction processing unit 44 in FIG. 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 44A performs color adjustment so that the color of the standard image projected on the standard white plate 80 in FIG. 6 matches the color of the color adjustment image projected on the area K of the screen 50. Based on the color of the standard image after the color adjustment, the second color space of the region K of the screen 50 is calculated, and the first color space stored in the storage unit 46 and the second color space are used as the colors. The color appearance correction is constructed so that the image appearances coincide with each other, and the color appearance correction is performed on the video signal in. The color adjustment image 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 for explaining a color adjustment method used in the projection image display device 40B, and FIGS. 18 and 19 are diagrams showing examples of screens 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 R, G, B color information on the projection surface is calculated from the projected W (white) color information. By estimating, the color characteristic of the projection image display apparatus 40B represented by the following equation (1) is determined.

However,
O: a conversion matrix representing the color characteristics of the projection image display device 40B, and the tristimulus values X, Y
, Z to R, G, B.
l, m, n: correction terms for correcting black offset (black shift)
Rack offset; when black is projected by the projector, the display screen is complete
(It is not black and color misregistration occurs, but this color misregistration 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 projection image display device 40B side, as shown in FIG. 17, from the projection image display device 40, an image of W (white) or W (White) and Bk (black) images are projected onto the projection surface (region K of the standard white plate 80 and 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. The tristimulus values X, Y, Z of W (white) or W (white) / Bk (black) are generated (color adjustment processing, step C2). In this case, the following equation (2) is used. Based on the color of the standard image after the color adjustment process, the second color space of the area K of the screen 50 is calculated (second color space calculation process). The storage unit 46 stores in advance the first color space on the standard white plate 80 (first color space storage process).

However,
M: RGB → XYZ conversion matrix
α, β, γ: Correction terms to consider black offset

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

  Here, the white (W) tristimulus value is, for example, “XW2, YW2, ZW2”. It is determined whether or not the generated white information (that is, white tristimulus values) “XW2, YW2, ZW2” on the projection image display device 40B side is within a predetermined range (step C3). This predetermined range corresponds to the range in which color correction is possible because color correction is impossible when the saturation of the wall color is strong. If the tristimulus values “XW2, YW2, ZW2” are within the predetermined range (YES in step C3), the chromaticity (wx, wy) of W (white) (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, the prediction equation for estimating the chromaticity (bx, by) of B (blue) uses 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. The coefficient a _i (i; 1, 2) is a variance / covariance matrix of W (white) chromaticity wx and wy, and B (blue) chromaticity bx and W (white) chromaticity wx. Using the variance S _1y and the covariance S _2y of the chromaticity bx of B (blue) and the chromaticity wy of W (white), the following equation (5) is used. The dispersion / covariance matrix of the chromaticity wx and wy of the W (white) prepares projection surfaces of a plurality of colors in advance, and the projection image display device 40B has W (white) and chromaticity wx and wy. It is obtained by measuring the chromaticity on the projection surface when a B (blue) image is projected 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)
The average coefficient b _i of the chromaticity wy of Wy /; W (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 way, the transformation matrix O in Equation (1) is easily calculated, and the color space on the projection image display device 40B side shown in Equation (1). An XYZ → RGB conversion formula is generated at 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) is increased. Then, using the XYZ → RGB conversion formula of Formula (1), color appearance correction is made to match the color appearance in the first color space and the second color space (color appearance). Correction construction process, 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 faithful and highly accurate color reproduction is realized in consideration of the environment in which the projection image display device 40B is installed. In step C3, when the tristimulus values X, Y, and Z are outside the predetermined range, 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 this color adjustment, and the first color space stored in the storage unit 46 and the second color space are Since the color appearance correction is constructed so that the color appearances coincide with each other and the color appearance correction is performed on the video signal in, the color adjustment for the video signal in is performed easily and with high accuracy. Further, since the color adjustment GUI 81 and the color palette 91 are used for color adjustment, the operation is simplified.

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, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention.
For example, in FIGS. 4 and 8, for example, 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. Further, 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 in any order, and any one or two processes may be performed. You can go.

  2 may be a single-plate projection liquid crystal projector, a DLP (Digital Light Processing) projector, or the like, in addition to the three-plate projection liquid crystal projector. DLP is a projection-type image display method developed by Texas Instruments, USA. For example, the direction of each mirror of a device in which millions of 13 μm square mirrors (DMD, digital micromirror device) are spread. By controlling the above, the light of the light source is reflected and an image is projected onto the screen.

  In the first to third embodiments, a plurality of types of images corrected with color correction parameters (at least one of the luminance, hue, and saturation of red, green, and blue) are prepared in advance. You may adjust so that the color of a right and left image may match by selecting an image. In the third embodiment, the standard white screen 50A is installed on the region J of the wall 90. However, instead of the screen 50A, the standard image board 60 in FIG. A color adjustment method similar to that of the embodiment may be performed. Further, in the correction data creation process (step A4) in FIG. 5 and the correction data creation process (step B4) in FIG. 9, each scroll bar for color adjustment corresponding to each color is displayed on the screen. The brightness, hue, or saturation may be adjusted using the scroll bar. In these correction data creation processes (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 for color adjustment. May be.

  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 processing is performed in the correction data creation processing (steps A4 and B4). A color closest to the current color on 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, brightness, 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.

It is a figure which shows the projection image display apparatus (projector) for implementing the color adjustment method which is 1st Example of this invention, and its surrounding environment. It is a block diagram which shows the electric constitution of the projection image display apparatus 40 in FIG. It is a block diagram which shows an example of the video output part 70 in FIG. 3 is a diagram illustrating an example of a standard image on a standard image plate 60 and a color adjustment image on an area K of a screen 50. FIG. It is a flowchart for demonstrating the color adjustment method used for the projection image display apparatus 40 of FIG. It is a figure which shows the projection image display apparatus for implementing the color adjustment method which is 2nd Example of this invention, and its surrounding environment. FIG. 7 is a block diagram showing an electrical configuration of a projected image display device 40A in FIG. 4 is a diagram illustrating an example of a standard image on a standard white plate 80 and a color adjustment image on an area K of a screen 50. FIG. It is a flowchart for demonstrating the color adjustment method used for the projection image display apparatus 40A of FIG. It is a figure explaining the color adjustment method which is the 3rd Example of this invention. It is a figure explaining the color adjustment method which is the 3rd Example of this invention. It is a figure explaining the color adjustment method which is the 3rd Example of this invention. It is a figure explaining the color adjustment method which is the 3rd Example of this invention. It is a figure explaining the color adjustment method which is the 3rd Example of this invention. It is a figure explaining the color adjustment method which is the 3rd Example of this invention. It is a block diagram which shows the electric constitution of the projection image display apparatus 40B for enforcing the color adjustment method which is the 4th Example of this invention. It is a flowchart explaining the color adjustment method used for the projection image display apparatus 40B. It is a figure which shows the example of the screen for performing the color adjustment of a standard image. It is a figure which shows the example of the screen for performing the color adjustment of a standard image. It is a figure which shows the modification of two area | regions. It is a figure which shows the modification of two area | regions. It is a figure which shows the projection image display apparatus for implementing the conventional color adjustment method, and its surrounding environment. It is a block diagram which shows the electrical structure of the projection image display apparatus 10 in FIG.

Explanation of symbols

40, 40A, 40B Projected 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 board 70 Video Output unit 80 Standard white plate 81 Color adjustment GUI
82 Scroll Bar for Hue / Saturation Adjustment 83 Scroll Bar for Lightness Adjustment GUI 90 Wall 91 Color Palette 92 Selected Color Display Unit 93 Wall Color Display Unit

Claims (27)

A method for adjusting a color on a projection surface of a projection image of a projector,
Placing a standard image plate with a standard image on the first area of the projection surface;
Projecting white light onto the standard image plate;
Projecting an image on the second area of the projection surface;
Correcting the color of the image projected on the second region so as to approach the color of the standard image;
A color adjustment method comprising:   2. The color adjustment method according to claim 1, wherein the standard image is displayed in a correct color when white light is projected on the standard image plate. A method for adjusting a color on a projection surface of a projection image of a projector,
Placing a white plate in the first region of the projection surface;
Projecting a standard image on the white plate;
Projecting an image on the second area of the projection surface;
Correcting the color of the image projected on the second region so as to approach the color of the standard image;
A color adjustment method comprising:   4. The color adjustment method according to claim 3, wherein the white plate displays the standard image projected thereon in a correct color. The color adjustment method according to claim 2, wherein the standard image includes red, green, or blue.   6. The color adjustment method according to claim 2, 4 or 5, wherein the standard image includes white.   The color adjustment method according to claim 2, wherein the standard image includes a specific color.   The color adjustment 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 so as to approach a color of a white portion of the standard image.   The method of adjusting the color balance of the said image projected on the said 2nd area | region so that it may approach the color balance of the said standard image is included, The process of Claim 1, 2, 3, 4, 5, 6 or 7 characterized by the above-mentioned. The color adjustment method described.   The color adjustment method according to claim 7, further comprising 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. A method for adjusting a color on a projection surface of a projection image of a projector,
Placing a white plate in the first region of the projection surface;
Projecting a standard image on the white plate;
Projecting an image on the second area of the projection surface;
Correcting the color of the standard image so as to approach the color of the image projected on the second region;
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:   12. The color adjustment method according to claim 11, wherein the white plate displays the standard image projected thereon in a correct color. The color adjustment method according to claim 12, wherein the standard image includes red, green, or blue.   14. The color adjustment method according to claim 12, wherein the standard image includes white.   The color adjustment method according to claim 12, wherein the standard image includes a specific color.   The color adjustment method according to claim 6, further comprising a step of adjusting the color of the white portion of the standard image so as to approach the color of the white portion of the image projected on the second region. .   16. The color adjustment method according to claim 11, further comprising a step of adjusting the color balance of the standard image so as to approach the color balance projected on the second region.   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 region. A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting white light on the standard image plate placed in the first area of the projection surface while projecting an adjustment image having a white portion in the second area ,
Information input from the operation unit, the color of the white portion of the image for adjustment projected on the second area is a standard image applied to the standard image plate of the first area. A projector comprising color adjustment means for adjusting a color of the adjustment image projected on the second area based on correction information for bringing the white portion closer to the color . A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting white light to the standard image plate placed in the first area of the projection surface, while projecting the adjustment image to the second area,
Information input from the operation unit, wherein the color balance of the adjustment image projected on the second region is changed to the color balance of the standard image applied to the standard image plate in the first region. based on the correction information for morning with near, the projector color adjustment means for adjusting the color of the adjustment image projected on the second region is characterized by comprising added. A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting white light on the standard image plate placed in the first area of the projection surface, while projecting an adjustment image having a specific color portion in the second area,
An information input from the operation unit, a standard image of the color of the specific color portion of the adjustment image projected on the second region, are Kakare the standard image plate of said first region based of the correction information for morning Konzuke the color of a particular color portion, characterized in that the color adjustment means for adjusting the color of the adjustment image projected on the second region is formed by adding projector. A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
Among the projection surface, while projecting the standard image having a white portion white plate placed in the first region, as well as projects the adjustment image having a white portion in the second region,
The information input from the operation unit, the color of the white portion of the adjustment image projected on the second area, the color of the standard image projected on the white plate of the first area A projector comprising color adjustment means for adjusting a color of the adjustment image projected on the second area based on correction information for bringing the white portion closer to the color . A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting the standard image on the white plate placed in the first area of the projection surface, while projecting the adjustment image on the second area,
An information input from the operation unit, the color balance of the adjustment image projected on the second region, the color balance of the projected the standard image in the white plate of said first region based on the correction information for morning with near, the projector color adjustment means for adjusting the color of the adjustment image projected on the second region is characterized by comprising added. A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting a standard image having a specific color part on the white plate placed in the first area of the projection surface, while projecting an adjustment image having the specific color part in the second area,
An information input from the operation unit, the color of the specific color portion of the adjustment image projected on the second region, the first region and the white plate has been the standard image projected on the on the basis of the correction information for morning Konzuke the color of a particular color portion of the feature that the color adjusting means for adjusting the color of the adjustment image projected on the second region is formed by adding Projector. A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
Among the projection surface, while projecting the standard image having a white portion white plate placed in the first region, as well as projects the adjustment image having a white portion in the second region,
The information input from the operation unit, the color of the white portion of the standard image projected on the white plate of the first area, the color of the adjustment image projected on the second area A projector comprising color adjustment means for adjusting a color of the adjustment image projected on the second area based on correction information for bringing the white portion closer to the color . A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting the standard image on the white plate placed in the first area of the projection surface, while projecting the adjustment image on the second area,
Information input from the operation unit, wherein the color balance of the standard image projected on the white plate in the first area is changed to the color balance of the adjustment image projected on the second area. based on the correction information for morning with near, the projector color adjustment means for adjusting the color of the adjustment image projected on the second region is characterized by comprising added. A projector having an operation unit operated by a user and a video output unit for projecting an image on a projection surface,
When adjusting color
While projecting a standard image having a specific color part on the white plate placed in the first area of the projection surface, while projecting an adjustment image having the specific color part in the second area,
An information input from the operation unit, the color of the specific color portion has been the standard image projected on the white plate of said first region, said adjustment image projected on the second region on the basis of the correction information for morning Konzuke the color of a particular color portion of the feature that the color adjusting means for adjusting the color of the adjustment image projected on the second region is formed by adding Projector.

Images