Method and apparatus of depth prediction mode selection

Patent metadata

Field	Value
Publication number	US-9641853-B2
Application number	US-201414253465-A
Country	US
Kind code	B2
Filing date	Apr 15, 2014
Priority date	Apr 15, 2013
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

There is disclosed a method, apparatus and computer program product for prediction mode selection for coding a block of a depth map. An ordered list of coding modes is obtained, wherein the ordered list of coding modes comprises a plurality of coding modes. And whether a depth modeling mode and/or a region boundary chain mode is to be added into the ordered list of coding modes in accordance with a decision condition is determined.

First claim

What is claimed is:

1. A method for coding a block of a depth map for a video data, comprising:
obtaining a first list comprising a plurality of coding modes;
obtaining a block variance of a block of a depth map for a video data;
determining if a first coding mode in the first list is not a flat mode and the block variance is greater than a certain threshold value, wherein upon determining that the first coding mode in the first list is not a flat mode and the block variance is greater than a certain threshold value a depth modeling mode is added to the first list;
coding, by a video encoder, the block of the depth map using a depth modeling mode from the first list; and
outputting the block of the depth map.

2. The method of claim 1 , further comprising:
updating the first list with adding a region boundary chain mode (RBCM) to obtain a second list upon determining that the block variance is greater than the certain threshold value; and coding the block of the depth map for the video data with a coding mode from the second list.

3. The method of claim 1 , further comprising:
updating the first list with adding a region boundary chain mode (RBCM) to obtain a second list when the block variance is not 0; and coding the block of the depth map for the video data with a coding mode from the second list.

4. The method of claim 1 , further comprising:
updating the first list with adding a region boundary chain mode (RBCM) to obtain a second list when the block variance is not 1; and coding the block of the depth map for the video data with a coding mode from the second list.

5. The method of claim 1 , further comprising:
updating the first list with adding the depth modeling mode when the block variance is not 0.

6. The method of claim 1 , further comprising:
updating the first list with adding the depth modeling mode when the block variance is not 1.

7. The method of claim 1 , wherein the flat mode is at least one of a planar mode and a DC mode.

8. The method of claim 1 , wherein the list is a depth intra coding mode list.

9. The method of claim 1 , wherein the certain threshold value is predefined in accordance with a quantization parameter.

10. An apparatus for coding a block of a depth map for a video data, comprising:
a non-transitory memory storage comprising instructions; and
one or more processors in communication with the storage, and the one or more processors configure the instructions to:
obtain a block variance of a block of a depth map for a video data;
determine if a first coding mode in the first list is not a flat mode and the block variance is greater than a certain threshold value, wherein upon determining that the first coding mode in the first list is not a flat mode and the block variance is greater than a certain threshold value a depth modeling mode is added to the first list;
code, by a video encoder, the block of the depth map using a depth modeling mode from the first list; and
output the block of the depth map.

11. The apparatus of claim 10 , the one or more processors further configure the instructions to:
update the first list with adding a region boundary chain mode (RBCM) to obtain a second list upon determining the block variance is greater than the certain threshold value; and
code the block of the depth map for the video data with a coding mode from the second list.

12. The apparatus of claim 10 , the one or more processors further configure the instructions to:
update the first list with adding a region boundary chain mode (RBCM) to obtain a second list upon determining the block variance is not 0; and code the block of the depth map for the video data with a coding mode from the second list.

13. The apparatus of claim 10 , the one or more processors further configure the instructions to:
update the first list with adding a region boundary chain mode (RBCM) to obtain a second list when the block variance is not 1; and code the block of the depth map for the video data with a coding mode from the second list.

14. The apparatus of claim 10 , the one or more processors further configure the instructions to:
update the first list with adding the depth modeling mode when the block variance is not 0.

15. The apparatus of claim 10 , the one or more processors further configure the instructions to:
update the first list with adding the depth modeling mode when the block variance is not 1.

16. The apparatus of claim 10 , wherein the flat mode is at least one of a planar mode and a DC mode.

17. The apparatus of claim 10 , wherein the list is a depth intra coding mode list.

18. The apparatus of claim 10 , wherein the certain threshold value is predefined in accordance with a quantization parameter.

Assignees

• Futurewei Technologies Inc
• Univ Santa Clara

Inventors

• Zheng Jianhua
• Gu Zhouye
• Ling Nam
• Zhang Chen-Xiong

Classifications

• H04N19/597

  specially adapted for multi-view video sequence encoding · CPC title

• H04N19/103

  Selection of coding mode or of prediction mode · CPC title

• H04N19/19 Primary

  using optimisation based on Lagrange multipliers · CPC title

• H04N19/14

  Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence) · CPC title

• H04N19/149

  by estimating the code amount by means of a model, e.g. mathematical model or statistical model · CPC title