Color image reproduction

• US 20070216776A1
• Filed: 03/14/2006
• Published: 09/20/2007
• Est. Priority Date: 03/14/2006
• Status: Abandoned Application

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Woolfe, Geoffrey
• Application Number:
  US11/374,839
• Publication Number:
  US 20070216776A1
• Time in Patent Office: Days
• US Class Current: 348/222.100
• CPC Class Codes: H04N 1/6086 by scene illuminant, i.e. conditions at the time of picture capture, e.g. flash, optical filter used, evening, cloud, daylight, artificial lighting, white point measurement, colour temperature
• CPC Class Codes: H04N 2201/3256 colour related metadata, e.g. colour, ICC profiles for use made of colour related metadata see the appropriate place, e.g. H04N1/60, H04N1/60 and subgroups
• CPC Class Codes: H04N 2201/3259 relating to the image, page or document, e.g. intended colours
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal

Abstract

A method for absolute color image reproduction comprises an image capture device, wherein the image capture device captures scene image data and associated scene viewing environment data. The scene viewing environment data are transformed into color appearance model profile (CAMP) viewing parameters. The scene image data and the CAMP viewing parameters are input into a color management system. The color management system utilizes the scene image data and the CAMP viewing parameters to output from an image output device a color reproduced image.

Claims

1. A method, comprising:

capturing, via an image capture device having an image sensor, a scene image in an image file;

identifying, via the image sensor, scene viewing environment data, wherein the scene viewing environment data are associated with the image file; and

calculating color appearance model profile parameters from the scene viewing environment data;

inputting the image file and the color appearance model profile parameters to a color management system; and

outputting a color reproduced image.

2. The method of claim 1, wherein the image capture device is a camera.

3. The method of claim 2, wherein the scene viewing environment data are determined using values of image capture device settings comprising aperture, exposure time, ISO film speed, exposure compensation. and white balance adjustment setting.

4. The method of claim 1, wherein the scene viewing environment data comprise metadata tagged to the image file.

5. The method of claim 1, wherein the scene image comprises a plurality of pixel values, and the scene viewing environment data are encoded in the plurality of pixel values.

6. The method of claim 1, wherein the color appearance model profile parameters comprise adaptive white point.

7. The method of claim 1, wherein the color appearance model profile parameters comprise absolute illuminance.

8. The method of claim 1, wherein the color appearance model profile parameters comprise illuminant chromaticity.

9. The method of claim 1, wherein the image capture device comprises a video camera.

10. The method of claim 1, wherein the image capture device comprises a xerographic device.

11. The method of claim 1, wherein the color management system utilizes a color appearance space.

12. The method of claim 11, wherein the color appearance space comprises CIECAM02.

13. A method for reproducing a color image, comprising:

capturing, via a digital camera having an image sensor, a scene image in an image file;

identifying, via the image sensor, scene viewing environment data, wherein the scene viewing environment data comprise metadata tagged to the image file;

calculating, via the digital camera, color appearance model profile parameters from the scene viewing environment data;

inputting the image file and the color appearance model profile parameters to a color management system; and

outputting a color reproduced image.

14. The method of claim 13, wherein the scene viewing environment data are determined using values of the digital camera settings comprising:

aperture, exposure time, ISO film speed, exposure compensation. and white balance adjustment setting.

15. The method of claim 13, wherein the color appearance model profile parameters comprise adaptive white point.

16. The method of claim 13, wherein the color appearance model profile parameters comprise absolute illuminance.

17. The method of claim 13, wherein the color appearance model profile parameters comprise illuminant chromaticity.

18. The method of claim 13, wherein the color management system comprises a color appearance space.

19. The method of claim 18, wherein the color appearance space comprises CIECAM02.

20. A method for reproducing an absolute color image, comprising:

capturing, via a digital camera having an image sensor, a scene image in an image file;

identifying, via the image sensor, scene viewing environment data, wherein the scene viewing environment data comprise metadata tagged to the image file, wherein the metadata are determined using values of the digital camera settings comprising;

aperture, exposure time, ISO film speed, exposure compensation, and white balance adjustment;

calculating, via the digital camera, color appearance model profile parameters from the scene viewing environment data, wherein the color appearance model profile parameters comprise;

adaptive white point, absolute illuminance, and illuminant chromaticity;

inputting the image file and the color appearance model profile parameters to a color management system; and

outputting a color reproduced image.