System, method, and apparatus for AC coefficient prediction

• US 20060227876A1
• Filed: 03/29/2005
• Published: 10/12/2006
• Est. Priority Date: 03/29/2005
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Pai, Ramadas L., Tongle, Anand, Sherigar, Bhaskar
• Application Number:
  US11/092,932
• Publication Number:
  US 20060227876A1
• Time in Patent Office: Days
• US Class Current: 375/240.180
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 takes precedence
• CPC Class Codes: H04N 19/48 using compressed domain processing techniques other than decoding, e.g. modification of transform coefficients, variable length coding [VLC] data or run-length data motion estimation in a transform domain H04N19/547; processing of decoded motion vectors H04N19/513
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

Presented herein are system(s), method(s), and apparatus for AC coefficient prediction. In one embodiment, there is presented a method for predicting AC coefficients for a macroblock. The method comprises determining whether a particular block is predicted from a top neighboring block or a left neighboring block; retrieving from a buffer, data from the top neighboring block or left neighboring block from which the particular block is predicted; and writing data from the particular block to the buffer.

Claims

1. A method for predicting AC coefficients for a macroblock, said method comprising:

determining whether a particular block is predicted from a top neighboring block or a left neighboring block;

retrieving from a buffer, data from the top neighboring block or left neighboring block from which the particular block is predicted; and

writing data from the particular block to the buffer.

2. The method of claim 1, wherein determining whether the particular block is predicted from the top neighboring block or the left neighboring block further comprises:

determining an absolute difference between a DC coefficient associated with the top neighboring block and a DC coefficient associated with a top left neighboring block; and

determining an absolute difference between a DC coefficient associated with the left neighboring block and a DC coefficient associated with a top left neighboring block.

3. The method of claim 1, wherein writing the data from the particular block further comprises overwriting the data from the top neighboring block or left neighboring block from which the particular block is predicted.

4. The method of claim 1, wherein writing the data from the particular block further comprises overwriting the data from the top neighboring block and the left neighboring block.

5. The method of claim 1, wherein retrieving from a buffer further comprises:

determining a particular buffer from a plurality of buffers, the particular buffer storing the data from the top neighboring block or left neighboring block from which the particular block is predicted.

6. The method of claim 1, further comprising:

writing data from the top neighboring block to one of a plurality of buffers, said plurality of buffers comprising the buffer.

7. A system for predicting AC coefficients for a macroblock, said system comprising:

a first circuit for determining whether a particular block is predicted from a top neighboring block or a left neighboring block;

a top neighbor buffer for storing data from a top neighboring block;

a left neighbor buffer for storing data from a left neighboring block;

a second circuit for predicting AC coefficients for the particular block; and

wherein the top neighbor buffer and the left neighbor buffer store data from the AC coefficients of the particular block.

8. The system of claim 7, wherein determining whether the particular block is predicted from the top neighboring block or the left neighboring block further comprises:

determining an absolute difference between a DC coefficient associated with the top neighboring block and a DC coefficient associated with a top left neighboring block; and

determining an absolute difference between a DC coefficient associated with the left neighboring block and a DC coefficient associated with a top left neighboring block.

9. The system of claim 7, wherein storing the data from the particular block further comprises overwriting the data from the top neighboring block and the left neighboring block.

10. A circuit for predicting AC coefficients for a macroblock, said circuit comprising:

a first circuit operable to determine whether a particular block is predicted from a top neighboring block or a left neighboring block;

a top neighbor buffer connected to the circuit and operable to store data from a top neighboring block;

a left neighbor buffer connected to the circuit and operable to store data from a left neighboring block;

a second circuit connected to the first circuit and operable to predict AC coefficients for the particular block; and

wherein the top neighbor buffer and the left neighbor buffer are operable to store data from the AC coefficients of the particular block.

11. The circuit of claim 10, wherein determining whether the particular block is predicted from the top neighboring block or the left neighboring block further comprises:

determining an absolute difference between a DC coefficient associated with the top neighboring block and a DC coefficient associated with a top left neighboring block; and

determining an absolute difference between a DC coefficient associated with the left neighboring block and a DC coefficient associated with a top left neighboring block.

12. The circuit of claim 10, wherein storing the data from the particular block further comprises overwriting the data from the top neighboring block and the left neighboring block.