Methods And Apparatuses For Generating Compressed Data Representing A Visual Frame

• US 20070263009A1
• Filed: 07/18/2006
• Published: 11/15/2007
• Est. Priority Date: 05/15/2006
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Webex LLC (Cisco Systems, Inc.)
• Inventors: Li, Xiang, Huang, He, Gu, Jiannong
• Granted Patent: US 7,801,356 B2
• Time in Patent Office: Days
• US Class Current: 345/601
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 19/94 Vector quantisation

Abstract

The methods and apparatuses detect a color of each of a plurality of pixels within a frame; group a portion of the plurality of pixels having a common color into a block; and generate a color list including the common color based on a threshold value corresponding to the block.

Claims

1. A method comprising:

detecting a color of each of a plurality of pixels within a frame;

grouping a portion of the plurality of pixels having a common color into a block; and

generating a color list including the common color based on a threshold value corresponding to the block.

2. The claim according to claim 1 further comprising generating a color table wherein the color table includes a number of pixels representing the portion of the plurality of pixels that comprise the block.

3. The claim according to claim 1 further comprising generating a color table wherein the color table includes a number of blocks having the common color.

4. The claim according to claim 1 wherein the threshold value is based on a size of the block.

5. The claim according to claim 1 wherein the threshold value is based on a number of blocks containing pixels with the common color.

6. The claim according to claim 1 wherein the threshold value is based on a number of pixels within the frame having the common color.

7. The claim according to claim 1 wherein the block includes adjacent pixels having the common color.

8. The claim according to claim 1 wherein the block includes pixels having the common color within a predetermined area.

9. The claim according to claim 1 further comprising forming a color variation value for the frame wherein the common color includes variations of color within a range based on the color variation value.

10. The claim according to claim 9 further comprising adjusting the range through the color variation value based on the color of each of the plurality of pixels within the frame.

11. The claim according to claim 10 wherein the range is widened thus allowing a wider range of colors to be considered the same color when the color of each of the plurality of pixels within the frame is more varied.

12. The claim according to claim 10 wherein the range is narrowed thus allowing a narrower range of colors to be considered the same color when the color of each of the plurality of pixels within the frame is more uniform.

13. A system comprising:

means for detecting a color of each of a plurality of pixels within a frame;

means for grouping a portion of the plurality of pixels having a common color into a block; and

means for generating a color list including the common color based on a threshold value corresponding to the block.

14. The system according to claim 13 where the means for generating the color list is based on a size of the block.

15. The system according to claim 13 where the means for generating the color list is based on a number of pixels within the block.

16. A system, comprising:

a pixel color module configured to detect each color of a plurality of pixels within a frame; and

a color manager module configured to track a number of the plurality of pixels having a common color and further configured to identify the common color within a color list.

17. The system according to claim 16 further comprising a storage module configured to store the color list.

18. The system according to claim 16 further comprising an interface module configured to receive the plurality of pixels.

19. The system according to claim 16 wherein the color manager module is further configured to determine a variation threshold to describe parameters of the common color.

20. The system according to claim 16 wherein the color manager module is further configured to track each color within the plurality of pixels within a color table.