Video coding using intra sub-partition coding mode

Patent metadata

Field	Value
Publication number	US-12464152-B2
Application number	US-202418438402-A
Country	US
Kind code	B2
Filing date	Feb 10, 2024
Priority date	Feb 5, 2019
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A method of video coding comprises independently generating a respective intra prediction for each of a plurality of corresponding sub-partitions. Each respective intra prediction is generated using a plurality of reference samples from a current coding block. Illustratively, no reconstructed sample from a first sub-partition of the plurality of corresponding sub-partitions is used to generate a respective intra prediction for any other sub-partition of the plurality of corresponding sub-partitions, and each of the plurality of corresponding sub-partitions has a width less than or equal to 2.

First claim

We claim:

1 . A method of video decoding, comprising:
obtaining a bitstream comprising encoded coding blocks, performing an intra prediction for a plurality of sub-partitions of a coding block in a Intra Sub-Partition (ISP) mode in response to determining that the plurality of sub-partitions meet first conditions for the intra prediction, wherein performing the intra prediction for the plurality of sub-partitions of the coding block comprises: merging at least two sub-partitions of the plurality of sub-partitions into one prediction region for the intra prediction, and generating predicted samples for the one prediction region in the intra prediction based on a plurality of reference samples of the coding block adjacent to the one prediction region, wherein the first conditions comprise that the plurality of sub-partitions are a plurality of vertical sub-partitions and each of the sub-partitions has a width less than or equal to 2.

2 . The method of claim 1 , wherein no reconstructed sample from one sub-partition of the at least two sub-partitions is used to perform the intra prediction for any other sub-partition of the at least two sub-partitions.

3 . The method of claim 1 further comprising:
generating a set of predicted samples for the plurality of vertical sub-partitions using a vertical prediction mode with a mode index larger than 50.

4 . The method of claim 1 further comprising performing the intra prediction for samples in the one prediction region independently and in parallel.

5 . The method of claim 1 , wherein the plurality of sub-partitions includes a last sub-partition, and the method further comprises signaling a coefficients block flag (CBF) value for the last sub-partition.

6 . The method of claim 5 , wherein the plurality of sub-partitions includes a last sub-partition, and the method further comprises inferring a coefficients block flag (CBF) value for the last sub-partition at a decoder.

7 . The method of claim 6 , wherein the coefficients block flag (CBF) value is inferred as one or zero.

8 . The method of claim 1 , wherein multiple prediction samples for the intra prediction are generated in parallel for the plurality of sub-partitions.

9 . An apparatus of video decoding, comprising:
one or more processors; a non-transitory computer-readable memory storing instructions executable by the one or more processors, wherein the one or more processors are configured to: obtain a bitstream comprising encoded coding blocks, perform an intra prediction for a plurality of sub-partitions of a coding block in a Intra Sub-Partition (ISP) mode in response to determining that the plurality of sub-partitions meet first conditions for the intra prediction, wherein performing the intra prediction for the plurality of sub-partitions of the coding block comprises: merging at least two sub-partitions of the plurality of sub-partitions into one prediction region for the intra prediction, and generating predicted samples for the one prediction region in the intra prediction based on a plurality of reference samples of the coding block adjacent to the one prediction region, wherein the first conditions comprise that the plurality of sub-partitions are a plurality of vertical sub-partitions and each of the sub-partitions has a width less than or equal to 2.

10 . The apparatus of claim 9 , wherein no reconstructed sample from one sub-partition of the at least two sub-partitions is used to perform the intra prediction for any other sub-partition of the at least two sub-partitions.

11 . The apparatus of claim 9 , wherein, the one or more processors are further configured to:
generate a set of predicted samples for the plurality of vertical sub-partitions using a vertical prediction mode with a mode index larger than 50.

12 . The apparatus of claim 9 , wherein, the one or more processors are further configured to: perform the intra prediction for the plurality of vertical sub-partitions independently and in parallel.

13 . The apparatus of claim 9 , wherein the plurality of sub-partitions includes a last sub-partition, and the method further comprises signaling a coefficients block flag (CBF) value for the last sub-partition.

14 . The apparatus of claim 13 , wherein the plurality of sub-partitions includes a last sub-partition, and the method further comprises inferring a coefficients block flag (CBF) value for the last sub-partition at a decoder.

15 . The apparatus of claim 14 , wherein the coefficients block flag (CBF) value is inferred as one or zero.

16 . A non-transitory computer readable storage medium storing a bitstream to be decoded by a decoding method comprising:
obtaining a bitstream comprising encoded coding blocks, performing an intra prediction for a plurality of sub-partitions of a coding block in a Intra Sub-Partition (ISP) mode in response to determining that the plurality of sub-partitions meet first conditions for the intra prediction, wherein performing the intra prediction for the plurality of sub-partitions of the coding block comprises: merging at least two sub-partitions of the plurality of sub-partitions into one prediction region for the intra prediction, and generating predicted samples for the one prediction region in the intra prediction based on a plurality of reference samples of the coding block adjacent to the one prediction region, wherein the first conditions comprise that the plurality of sub-partitions are a plurality of vertical sub-partitions and each of the sub-partitions has a width less than or equal to 2.

17 . The non-transitory computer readable storage medium of claim 16 , wherein no reconstructed sample from one sub-partition of the at least two sub-partitions is used to perform the intra prediction for any other sub-partition of the at least two sub-partitions.

18 . The non-transitory computer readable storage medium of claim 16 , wherein the decoding method further comprises:
generating a set of predicted samples for the plurality of vertical sub-partitions using a vertical prediction mode with a mode index larger than 50.

19 . The non-transitory computer readable storage medium of claim 16 , wherein the decoding method further comprises:
performing the intra prediction for samples in the one prediction region independently and in parallel.

20 . The non-transitory computer readable storage medium of claim 16 , wherein the decoding method further comprises: signaling a coefficients block flag (CBF) value for a last sub-partition in the plurality of sub-partitions.

Assignees

• Beijing Dajia Internet Information Tech Co Ltd

Inventors

• Chen Yi-Wen
• Xiu Xiaoyu
• Wang Xianglin
• Ma Tsung-Chuan

Classifications

• H04N19/593 Primary

  involving spatial prediction techniques · CPC title

• H04N19/186

  the unit being a colour or a chrominance component · CPC title

• H04N19/176

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

• H04N19/46

  Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) · CPC title

• H04N19/159

  Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction · CPC title