Method and apparatus of spatial motion vector prediction derivation for direct and skip modes in three-dimensional video coding

Patent metadata

Field	Value
Publication number	US-9967586-B2
Application number	US-201314655951-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Jan 7, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A method and apparatus for spatial motion vector prediction (MVP) candidate derivation for Direct mode and Skip mode in three-dimensional video coding are disclosed. The motion vector of each neighboring block is associated with a corresponding reference picture index pointing to a corresponding reference picture. For both the Direct mode and the Skip mode, the motion vector of each neighboring block is selected as the spatial MVP candidate for each neighboring block only if the corresponding reference picture index is the same as a selected target reference picture index. In one embodiment, the target reference picture index is set to 0. In another embodiment, the target reference picture index corresponds to a majority of the corresponding reference picture indexes associated with the neighboring blocks in Direct mode or Skip mode.

First claim

The invention claimed is:

1. A method for spatial motion vector prediction (MVP) candidate derivation for Direct mode and Skip mode in three-dimensional video coding, the method comprising:
receiving input data associated with a current block in a dependent view;
identifying neighboring blocks of the current block, wherein a motion vector of each neighboring block is associated with a corresponding reference picture index pointing to a corresponding reference picture;
identifying a target reference picture index;
for both the Direct mode and the Skip mode, selecting the motion vector of said each neighboring block as a spatial MVP candidate for said each neighboring block only if the corresponding reference picture index is the same as the target reference picture index;
determining a final spatial MVP based on the spatial MVP candidates selected for the neighboring blocks; and
applying video encoding or decoding to the input data using the final spatial MVP.

2. The method of claim 1 , further comprises selecting a default vector as the spatial MVP candidate for said each neighboring block if the corresponding reference picture index is not the same as the target reference picture index.

3. The method of claim 2 , wherein the default vector is derived from at least a portion of motion information of a corresponding block in a reference view corresponding to the current block, a disparity vector converted from depth samples of a depth block associated with the current block, or a zero motion vector.

4. The method of claim 1 , wherein the target reference picture index is 0.

5. The method of claim 1 , wherein the target reference picture index corresponds to a majority of the corresponding reference picture indexes associated with the neighboring blocks in the Direct mode, the Skip mode or both.

6. The method of claim 1 , wherein a median, minimum, maximum, mean, majority or linear combination of the spatial MVP candidates selected for the neighboring blocks is used as the final spatial MVP.

7. The method of claim 1 , wherein the final spatial MVP is derived based on a first available MVP candidate from the spatial MVP candidates according to a pre-defined search order.

8. The method of claim 1 , wherein the neighboring blocks comprise a left block, an upper block and an upper-right block of the current block.

9. An apparatus for spatial motion vector prediction (MVP) candidate derivation for Direct mode and Skip mode in three-dimensional video coding, the apparatus comprising
one or more electronic circuits, wherein said one or more electronic circuits are configured to:
receive input data associated with a current block in a dependent view;
identify neighboring blocks of the current block, wherein a motion vector of each neighboring block is associated with a corresponding reference picture index pointing to a corresponding reference picture;
identify a target reference picture index;
for both the Direct mode and the Skip mode, select the motion vector of said each neighboring block as a spatial MVP candidate for said each neighboring block only if the corresponding reference picture index is the same as the target reference picture index;
determine a final spatial MVP based on the spatial MVP candidates selected for the neighboring blocks; and
apply video encoding or decoding to the input data using the final spatial MVP.

10. The apparatus of claim 9 , wherein said one or more electronic circuits are further configured to select the default vector as a spatial MVP candidate for said each neighboring block if the corresponding reference picture index is not the same as the target reference picture index.

11. The apparatus of claim 9 , wherein the default vector is derived from at least a portion of motion information of a corresponding block in a reference view corresponding to the current block, a disparity vector converted from depth samples of a depth block associated with the current block, and a zero motion vector.

12. The apparatus of claim 9 , wherein the target reference picture index is 0.

13. The apparatus of claim 9 , wherein the target reference picture index corresponds to a majority of the corresponding reference picture indexes associated with the neighboring blocks in the Direct mode or the Skip mode.

14. The apparatus of claim 9 , wherein a median, minimum, maximum, mean, majority, or linear combination of the spatial MVP candidates selected for the neighboring blocks is used as the final spatial MVP.

15. The apparatus of claim 9 , wherein the final spatial MVP is derived based on a first available MVP candidate from the spatial MVP candidates according to a pre-defined search order.

Assignees

• Mediatek Inc

Inventors

• Lin Jian-Liang
• Chen Yi-Wen

Classifications

• H04N19/597

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

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/103

  Selection of coding mode or of prediction mode · CPC title

• H04N19/105

  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 title

• H04N19/11

  among a plurality of spatial predictive coding modes · CPC title