INTRA BLOCK COPY CODING WITH TEMPORAL BLOCK VECTOR PREDICTION

• US 20170289566A1
• Filed: 09/18/2015
• Published: 10/05/2017
• Est. Priority Date: 09/26/2014
• Status: Abandoned Application

• Current Assignee: VID SCALE Inc. (InterDigital, Inc.)
• Original Assignee: VID SCALE Inc. (InterDigital, Inc.)
• Inventors: He, Yuwen, Ye, Yan, Xiu, Xiaoyu
• Application Number:
  US15/514,495
• Publication Number:
  US 20170289566A1
• Time in Patent Office: Days
• CPC Class Codes: H04N 19/11 among a plurality of spatial predictive coding modes
• CPC Class Codes: H04N 19/147 according to rate distortion criteria rate-distortion as a criterion for motion estimation H04N19/567
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

Embodiments disclosed herein operate to improve prior video coding techniques by incorporating an IntraBC flag explicitly at the prediction unit level in merge mode. This flag allows separate selection of block vector (BV) candidates and motion vector (MV) candidates. Specifically, explicit signaling of an IntraBC flag provides information on whether a specific prediction unit will use a BV or an MV. If the IntraBC flag is set, the candidate list is constructed using only spatial and temporal neighboring BVs. If the IntraBC flag is not set, the candidate list is constructed using only spatial and temporal neighboring MVs. An index is then coded which points into the list of candidate BVs or MVs. Further embodiments disclosed herein describe the use of BV-MV bi-prediction in a unified IntraBC and inter framework.

Claims

1. A video coding method comprising:

identifying a candidate block vector for prediction of a first video block, wherein the first video block is in a current picture, and wherein the candidate block vector is a first block vector used for prediction of a second video block in a temporal reference picture; and

coding the first video block with intra block copy coding using the candidate block vector as a predictor of the first video block.

2. The method of claim 1, wherein coding the first video block includes generating a bitstream coding the current picture as a plurality of blocks of pixels, and wherein the bitstream includes an index identifying the first block vector.

3. The method of claim 1, wherein coding the first video block includes receiving a bitstream coding the current picture as a plurality of blocks of pixels, and wherein the bitstream includes an index identifying the first block vector.

4. The method of claim 1, further comprising generating a merge candidate list, wherein the merge candidate list includes the first block vector, and wherein coding the first video block includes providing an index identifying the first block vector in the merge candidate list.

5. The method of claim 4, wherein the merge candidate list further includes at least one default block vector.

6. The method of claim 1, further comprising:

generating a merge candidate list, wherein the merge candidate list includes a set of motion vector merge candidates and a set of block vector merge candidates;

wherein coding the first video block includes;

providing the first video block with a flag identifying that the predictor is in the set of block vector merge candidates; and

providing the first video block with an index identifying the first block vector within the set of block vector merge candidates.

7. The method of claim 1, wherein coding the first video block comprises:

receiving a flag identifying that the predictor is a block vector;

generating a merge candidate list, wherein the merge candidate list includes a set of block vector merge candidates; and

receiving an index identifying the first block vector within the set of block vector merge candidates.

8. A video coding method comprising:

forming a list of motion vector merge candidates and a list of block vector merge candidates for a prediction unit;

selecting one of the merge candidates as a predictor;

providing the prediction unit with a flag identifying whether the predictor is in the list of motion vector merge candidates or in the list of block vector merge candidates; and

providing the prediction unit with an index identifying the predictor from within the identified list of merge candidates.

9. The method of claim 8, wherein at least one of the block vector merge candidates is generated using temporal block vector prediction.

10. A video coding method comprising:

forming a list of merge candidates for a prediction unit, wherein each merge candidate is a predictive vector, and wherein at least one of the predictive vectors is a first block vector from a temporal reference picture;

selecting one of the merge candidates as a predictor; and

providing the prediction unit with an index identifying the predictor from within the identified set of merge candidates.

11. The method of claim 10, further comprising adding a predictive vector to the list of merge candidates only after determining that the predictive vector is valid and unique.

12. The method of claim 10, wherein the list of merge candidates further includes at least one derived block vector.

13. The method of claim 10, wherein the selected predictor is the first block vector.

14. The method of claim 10, wherein the first block vector is a block vector associated with a collocated prediction unit.

15. The method of claim 14, wherein the collocated prediction unit is in a collocated reference picture specified in a slice header.

16. A video coding method comprising:

identifying a set of merge candidates for a prediction unit, wherein the identification of the set of merge candidates includes adding at least one candidate with a default block vector;

selecting one of the candidates as a predictor; and

providing the prediction unit with an index identifying the merge candidate from within the identified set of merge candidates.

17. The method of claim 16, wherein the default block vector is selected from a list of default block vectors.

18. The method of claim 16, wherein the set of merge candidates additionally includes at least one zero motion vector.

19. The method of claim 18, wherein the at least one default block vector and the at least one zero motion vector are arranged in an interleaved manner in the set of merge candidates.

20. The method of claim 18 wherein the default block vector is selected from a list of default block vectors consisting of

(−

PUx−

PUw,

     0), (−

PUx−

2*PUw,

     0), (−

PUy−

PUh,

     0), (−

PUy−

2*PUh,

     0), and (−

PUx−

PUw, −

PUy−

PUh),

where PUw and PUh are width and height of the prediction unit, respectively, and wherein PUx and PUy are the block position of PU relative to the top left position of the coding unit.