Method for Sub-PU Motion Information Inheritance in 3D Video Coding

• US 20160366441A1
• Filed: 01/27/2015
• Published: 12/15/2016
• Est. Priority Date: 01/27/2014
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Inventors: AN, Jicheng, ZHANG, Kai, LIN, Jian-Liang
• Granted Patent: US 10,257,539 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 19/139 Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/436 using parallelised computational arrangements
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/597 specially adapted for multi-view video sequence encoding

Abstract

A method and apparatus for coding a depth block in three-dimensional video coding are disclosed. Embodiments of the present invention divide a depth block into depth sub-blocks and determine default motion parameters. For each depth sub-block, the motion parameters of a co-located texture block covering the center sample of the depth sub-block are determined. If the motion parameters are available, the motion parameters are assigned as inherited motion parameters for the depth sub-block. If the motion parameters are unavailable, the default motion parameters are assigned as inherited motion parameters for the depth sub-block. The depth sub-block is then encoded or decoded using the inherited motion parameters or a motion candidate selected from a motion candidate set including the inherited motion parameters. The depth block may correspond to a depth prediction unit (PU) and the depth sub-block corresponds to a depth sub-PU.

Claims

1. A method for coding a depth block in three-dimensional video coding, the method comprising:

receiving input data associated with a current depth block of a depth map;

dividing the current depth block into multiple depth sub-blocks;

determining default motion parameters;

for a current depth sub-block;

determining first motion parameters associated with a first co-located texture block covering a center sample of the current depth sub-block;

if the first motion parameters are available, assigning the first motion parameters as inherited motion parameters for the current depth sub-block;

if the first motion parameters are unavailable, assigning the default motion parameters as the inherited motion parameters for the current depth sub-block; and

applying coding or decoding to the current depth sub-block using the inherited motion parameters or a motion candidate selected from a motion candidate set including the inherited motion parameters.

2. The method of claim 1, wherein the current depth block corresponds to a depth prediction unit (PU) and the current depth sub-block corresponds to a depth sub-PU.

3. The method of claim 1, wherein said determining the default motion parameters corresponds to identifying the default motion parameters based on second motion parameters associated with a co-located texture block covering a selected depth sub-block of the multiple depth sub-blocks.

4. The method of claim 3, wherein the selected depth sub-block of the multiple depth sub-blocks corresponds to a center depth sub-block of the multiple depth sub-blocks located in a lower-right quadrant of the current depth block and adjacent to a center point of the current depth block.

5. The method of claim 3, wherein if both the default motion parameters and the first motion parameters are unavailable, the inherited motion parameters for the current depth sub-block are set to unavailable.

6. The method of claim 3, wherein the selected depth sub-block of the multiple depth sub-blocks corresponds to a center depth sub-block of the multiple depth sub-blocks located in a lower-left, upper-right or upper-left quadrant of the current depth block and adjacent to a center point of the current depth block.

7. The method of claim 1, wherein said applying coding or decoding to the current depth sub-block comprises pruning the motion candidate set including the inherited motion parameters.

8. The method of claim 7, wherein said pruning the motion candidate set is disabled when a current depth sub-block size is smaller than a threshold size.

9. The method of claim 1, wherein the center sample of the current depth sub-block corresponds to a depth sample in a lower-right quadrant of the current depth sub-block and adjacent to a center point of the current depth sub-block.

10. An apparatus for coding a depth block in a three-dimensional video coding system, the apparatus comprising one or more electronic circuits configured to:

receive input data associated with a current depth block of a depth map;

divide the current depth block into multiple depth sub-blocks;

determine default motion parameters;

for a current depth sub-block;

determine first motion parameters associated with a first co-located texture block covering a center sample of the current depth sub-block;

if the first motion parameters are available, assign the first motion parameters as inherited motion parameters for the current depth sub-block;

if the first motion parameters are unavailable, assign the default motion parameters as the inherited motion parameters for the current depth sub-block; and

apply coding or decoding to the current depth sub-block using the inherited motion parameters or a motion candidate selected from a motion candidate set including the inherited motion parameters.

11. The apparatus of claim 10, wherein the current depth block corresponds to a depth prediction unit (PU) and the current depth sub-block corresponds to a depth sub-PU.

12. The apparatus of claim 10, wherein said determining the default motion parameters corresponds to identifying the default motion parameters based on second motion parameters associated with a co-located texture block covering a selected depth sub-block of the multiple depth sub-blocks.

13. The apparatus of claim 12, wherein the selected depth sub-block of the multiple depth sub-blocks corresponds to a center depth sub-block of the multiple depth sub-blocks located in a lower-right quadrant of the current depth block and adjacent to a center point of the current depth block.

14. The apparatus of claim 12, wherein if both the default motion parameters and the first motion parameters are unavailable, the inherited motion parameters for the current depth sub-block are set to unavailable.

15. The apparatus of claim 12, wherein the selected depth sub-block of the multiple depth sub-blocks corresponds to a center depth sub-block of the multiple depth sub-blocks located in a lower-left, upper-right or upper-left quadrant of the current depth block and adjacent to a center point of the current depth block.

16. The apparatus of claim 10, wherein the motion candidate set is pruned.

17. The apparatus of claim 16, wherein pruning of the motion candidate set is disabled when a current depth sub-block size is smaller than a threshold size.

18. The apparatus of claim 10, wherein the center sample of the current depth sub-block corresponds to a depth sample in a lower-right quadrant of the current depth sub-block and adjacent to a center point of the current depth sub-block.