Optimized color image encoding and decoding using color space parameter data

• US 20060291720A1
• Filed: 06/23/2005
• Published: 12/28/2006
• Est. Priority Date: 06/23/2005
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Malvar, Henrique S., Stokes, Michael D., Van Hoof, Hubert
• Granted Patent: US 7,706,607 B2
• Time in Patent Office: Days
• US Class Current: 382/166
• CPC Class Codes: H04N 1/64 Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor H04N19/00 takes precedence
• CPC Class Codes: H04N 19/126 Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/60 using transform coding

Abstract

Optimized color codecs and methods of compressing and decompressing color images using programmable color space parameters are provided. In accordance with one method of encoding a color image, input data comprising input image pixel data and color space parameters is provided. The input image pixel data is compressed based on the color space parameter data. The color space parameter data is then appended to the compressed image pixel data. In accordance with one method of decoding a compressed color image, compressed data is provided that comprises compressed image pixel data and color space parameters. The color space parameters are separated from the compressed image pixel data. The compressed image pixel data is then decompressed based on the color space parameters.

Claims

1. A method of encoding color image data comprising:

providing input data, wherein the input data comprises input image pixel data and color space parameter data;

compressing the input image pixel data based on at least a portion of the color space parameter data to create compressed image pixel data; and

appending at least a portion of the color space parameter data with the compressed image pixel data.

2. The method of claim 1, wherein the color space parameter data comprises data specifying at least one property of a first color space.

3. The method of claim 2, wherein the first color space is the color space of the input image pixel data.

4. The method of claim 2, wherein the color space parameter data further comprises data specifying at least one property of a second color space.

5. The method of claim 3, wherein the second color space comprises at least one of a compression optimized color space and a destination device optimized color space.

6. The method of claim 4, further comprising converting the input image pixel data from the first color space to the second color space using the color space parameter data, thereby creating converted image pixel data.

7. The method of claim 6, wherein compressing the input image pixel data comprises compressing the converted input image pixel data based on at least a portion of the data specifying at least one property of the second color space.

8. The method of claim 1, wherein the color space parameter data comprises at least one of a color coordinate space, a bit format, a tone reproduction curve, and a color space primary.

9. The method of claim 1, wherein the color image data comprises at least one of a static image and a video image.

10. One or more computer readable media have computer-usable instructions for performing the method of claim 1.

11. A method of decoding compressed image pixel data comprising:

providing compressed data, the compressed data comprising compressed image pixel data and color space parameter data;

separating the color space parameter data from the compressed image pixel data; and

decompressing the compressed image pixel data based on at least a portion of the color space parameter data to create decompressed image pixel data.

12. The method of claim 11, further comprising converting the color space of the decompressed image pixel data using at least a portion of the color space parameter data.

13. The method of claim 11, wherein the color space parameter data comprises at least one of data specifying at least one property of a first color space and data specifying at least one property of a second color space.

14. The method of claim 13, further comprising providing additional color space parameter data specifying at least one property of a third color space.

15. The method of claim 14, wherein the third color space is a destination device optimized color space.

16. The method of claim 15, further comprising converting the decompressed image pixel data to the third color space using at least a portion of the color space parameter data and at least a portion of the additional color space parameter data.

17. One or more computer readable media have computer-usable instructions for performing the method of claim 11.

18. An optimized color encoder for encoding color image data, the color optimized encoder comprising:

a receiving component for receiving input data comprising input image pixel data and color space parameter data;

an encoding component for compressing the input image pixel data based on at least a portion of the color space parameter data to create compressed image pixel data; and

a multiplexing component for appending at least a portion of the color space parameter data with the compressed image pixel data.

19. The optimized color encoder of claim 19, further comprising a mapping component for converting the input image pixel data from a first color space to a second color space to create converted input image pixel data.

20. The optimized color encoder of claim 20, wherein the encoding component compresses the converted input image pixel data.