Texture compression

• US 7,796,823 B1
• Filed: 09/19/2006
• Issued: 09/14/2010
• Est. Priority Date: 09/22/2005
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Budagavi, Madhukar
• Primary Examiner(s): Do; Anh Hong
• Application Number:
  US11/532,989
• Time in Patent Office: 1,456 Days
• Field of Search: 382/173, 382/298, 382/240, 382/162, 382/236, 382/234, 382/232, 382/233, 375/E7.254, 375/240.01, 375/420.01, 345/582, 345/423, 345/428, 324/309, 348/E13.014, 600/109, 600/117
• US Class Current: 382/232
• CPC Class Codes: G06T 9/00 Image coding bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00

Abstract

3D graphics rendering includes texture compression including joint compression of related textures by using one texture to predict the other, object-based compression for non-rectangular textures, and multitexturing with vector quantization.

Claims

1. A method in a processor of texture compression, comprising the steps of:

(a) providing first and second texture images;

(b) finding a third image as the difference between said first and second images;

(c) jointly compressing in said processor said first image and said third image; and

(d) finding an error image as the difference between said image and a decompression of a DXTC-compressed image.

2. The method of claim 1, wherein said compressing is lossy.

3. A method of a processor for texture image compression, comprising the steps of:

(a) providing a texture image which includes a texture object of less than all the pixels of said image;

(b) finding a bit map which indicates pixels within said object and pixel outside of said object;

(c) compressing, in said processor, said texture image as said bit map plus said object; and

(d) finding an error image as the difference between said image and a decompression of a DXTC-compressed image.

4. A method in a processor of DXTC-compressed texture image compression, comprising the steps of:

(a) providing a DXTC-compressed texture image which includes a texture object of less than all the pixels of said image;

(b) finding a binary map which indicates DXTC 4×

4 pixel blocks containing pixels within said object; and

(c) jointly compressing, in said processor, said DXTC-compressed texture image as said binary map and a portion of said DXTC-compressed texture image corresponding to said DXTC 4×

4 pixel blocks of said object.

5. A method of a processor of texture image compression, comprising the steps of:

(a) providing a texture image;

(b) jointly DXTC-compressing said image in said processor;

(c) finding an error image as the difference between said image and a decompression of said DXTC-compressed image; and

(d) DXTC-compressing said error image.

6. The method of claim 5 wherein after said finding an error image, shifting and scaling said error image prior to said DXTC-compressing.