Color reproducing system

• US 20030137610A1
• Filed: 02/24/2003
• Published: 07/24/2003
• Est. Priority Date: 02/25/1999
• Status: Abandoned Application

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Ohsawa, Kenro
• Application Number:
  US10/372,348
• Publication Number:
  US 20030137610A1
• Time in Patent Office: Days
• US Class Current: 348/744
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026
• CPC Class Codes: H04N 9/3182 Colour adjustment, e.g. white balance, shading or gamut white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607

Abstract

A color reproduction system includes a color conversion unit for displaying a color image on a multi-primary-color display. The color conversion unit includes a maximum brightness signal calculating unit for calculating signals corresponding to three color reproduction area corners as the corners of a plane that constitute a color reproduction area surface of the display. The three color reproduction area corners surround the vectors of input tristimulus values. The maximum brightness signal calculating unit calculates a weighting factor obtained when the input tristimulus values are expressed as a linear sum of the tristimulus values of the color reproduction area corner vectors. The color conversion unit includes a color image signal calculating unit for calculating a color image signal used to display the input tristimulus values, on the basis of the signals corresponding to the color reproduction area corners and the weighting factor.

Claims

1. A color reproduction system comprising:

color image display means;

color conversion means for converting input XYZ image data having XYZ values indicating pixels in a CIE color system, into data which is allowed to be input in the color image display means,

wherein the color image display means includes a screen and a plurality of color image projection means, the screen being divided into a plurality of areas which correspond to the plurality of color image projection means, respectively;

each of the plurality of color image projection means including four or more primary colors, and the plurality of color image projection means being designed to project respective images onto the screen such that the images constitute a single image.

2. A color reproduction system according to claim 1, wherein the color image projection means comprisess a combination of a plurality of color image projection units including different primary colors.

3. A color reproduction system according to claim 2, wherein each of the color image projection units includes a plurality of primary colors.

4. A color reproduction system according to claim 2, wherein the color image projection means comprises at least one color image projection unit including a plurality of sets of primary colors different from a primary color included in another color image projection unit to be combined with said at least one color image projection unit.

5. A color reproduction system according to claim 3, wherein each of the color image projection units includes a set of three primary colors.

6. A color reproduction system according to claim 5, wherein the color image projection means combines two of the color image projection units, to thereby achieve projection of a color image with six primary colors, one of said two of the color image projection units including a set of three primary colors different from a set of three primary colors of the other of said two of the color image projection units.

7. A color reproduction system according to claim 1, wherein the screen includes at least one of a flat surface, a spherical surface and a curved surface.

8. A color reproduction system according to any one of claims 1 to 7, which further comprises a geometric correction unit for producing X′

Y′

Z′

image data in which correction is executed with respect to at least one of a position and geometrical distortion of each of the color image projection means corresponding to the areas, on the basis of input XYZ image data having XYZ values indicating pixels in a CIE color system.

9. A color reproduction system according to any one of claims 2 to 6, which further comprises a geometric correction unit for producing X′

Y′

Z′

image data in which correction is executed with respect to at least one of a position and geometrical distortion of the color image projection units on the basis of input XYZ image data having XYZ values indicating pixels in a CIE color system.

10. A color reproduction system according to any one of claims 1 to 7, wherein the color conversion means converts the XYZ image data to the plurality of color image projection means corresponding to the areas, into signals to be input to the plurality of color image projection means, by using profile data obtained by measuring the plurality of color projection means, respectively.

11. A color reproduction system according to any one of claims 1 to 7, which further comprises a geometric correction unit for producing X′

Y′

Z image data in which correction is executed with respect to at least one of a position and geometrical distortion of each of the color image projection means corresponding to the areas, on the basis of input XYZ image data having XYZ values indicating pixels in a CIE color system, and wherein the color conversion means converts the X′

Y′

Z′

image data into signals to be input to the plurality of color image projection means, by using profile data obtained by measuring the plurality of color projection means, respectively.

12. A color reproduction system according to any one of claims 1 to 7, which further comprises a geometric correction unit for producing X′

Y′

Z′

image data in which correction is executed with respect to at least one of a position and geometrical distortion of each of the color image projection units on the basis of input XYZ image data having XYZ values indicating pixels in a CIE color system, and wherein the color conversion means converts the X′

Y′

Z′

image data into signals to be input to the plurality of color image projection means, by using profile data obtained by measuring the plurality of color projection means, respectively.

13. An image correcting method for a color reproduction system which comprises a screen divided into a plurality of areas, and a plurality of image projection means each including four or more primary colors and respectively corresponding to the plurality of areas, the color reproduction system being designed to project images from the plurality of color image projection means onto the screen such that the images constitute a single image, the image correcting method comprising:

inputting XYZ image data having XYZ values indicating pixels in a CIE color system;

producing X′

Y′

Z′

image data in which the input XYZ image data is corrected with respect to one of a position and geometrical distortion of each of the plurality of color image projection means; and

converting the X′

Y′

Z′

image data into signals to be input to the plurality of color image projection means, by using profile data obtained by measuring the plurality of color projection means, respectively.

14. An image correcting method for a color reproduction system which, comprises a screen divided into a plurality of areas, and a plurality of image projection units including different primary colors, and constituting a plurality of color image projection means each including four or more primary colors corresponding to the plurality of areas of the screen, the color reproduction system being designed to project images from the plurality of color image projection units onto the screen such that the images constitute a single image, the image corroding method comprising:

inputting XYZ image data having XYZ values indicating pixels in a CIE color system;

producing X′

Y′

Z′

image data in which the input XYZ image data is corrected with respect to one of a position and geometrical distortion of each of the color image projection units; and

converting the X′

Y′

Z′

image data into signals to be input to the plurality of color image projection means, by using profile data obtained by measuring the plurality of color projection means, respectively.