Granted Patent B2

US 12,739,368 · App. 18/171,049 · Granted Sep 15, 2026

Inventors: Hongbin Liu (Beijing, CN); Li Zhang (San Diego, CA); Kai Zhang (San Diego, CA); Hsiao Chiang Chuang (San Diego, CA); Zhipin Deng (Beijing, CN)

Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.; BYTEDANCE INC.

H04N19/117H04N19/132H04N19/176H04N19/70H04N19/82

Abstract

Claims (45)

1 . A method of processing video data, comprising:

determining, for a conversion between a first video region of a video and a bitstream of the video, a first syntax element corresponding to the first video region is present in the bitstream, wherein the first syntax element indicates an index of a first adaptation parameter set referred to by the first video region; and

performing the conversion based on the determining,

wherein in response to the determining, a value of a second syntax element included in the first adaptation parameter set is 1, and wherein the second syntax element indicates whether to include a luma filter set in the first adaptation parameter set,

wherein for a sample of the first video region, a filter index is derived based on multiple sample differences in different directions, and a specific luma filter is selected, based on the filter index, from the luma filter set in the first adaption parameter set and fixed luma filters which are not included in the luma filter set,

wherein a maximum value of the filter index is indicated by N, and a number of luma filters in the luma filter set is smaller than or equal to N+1, and

wherein when the number of luma filters in the luma filter set is smaller than N+1, at least two luma filters with different filter indices have a same filter coefficient.

2 . The method of claim 1 , wherein the first video region is a video picture, and the first syntax element is present in a picture header syntax element set.

3 . The method of claim 1 , wherein the first video region is a video slice, and the first syntax element is present in a slice header syntax element set.

4 . The method of claim 1 , wherein the first video region includes multiple video coding tree blocks, and the video coding tree block is split into multiple M*M video block, where M is equal to 2 or 4, and

wherein a same filter index is applied for samples in a same M*M video block.

5 . The method of claim 4 , wherein the multiple sample differences in different directions are derived for every M*M video region based on 1:2 subsampling rate.

6 . The method of claim 1 , wherein the first adaptation parameter set includes an adaptive loop filtering adaptation parameter set.

7 . The method of claim 1 , wherein the conversion includes encoding a current video block into the bitstream.

8 . The method of claim 1 , wherein the conversion includes decoding a current video block from the bitstream.

9 . An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

determine, for a conversion between a first video region of a video and a bitstream of the video, a first syntax element corresponding to the first video region is present in the bitstream, wherein the first syntax element indicates an index of a first adaptation parameter set referred to by the first video region; and

perform the conversion based on the determining;

wherein in response to the determining, a value of a second syntax element included in the first adaptation parameter set is 1, and wherein the second syntax element indicates whether to include a luma filter set in the first adaptation parameter set,

wherein for a sample of the first video region, a filter index is derived based on multiple sample differences in different directions, and a specific luma filter is selected, based on the filter index, from the luma filter set in the first adaption parameter set and fixed filters which are not included in the luma filter set,

wherein a maximum value of the filter index is indicated by N, and a number of luma filters in the luma filter set is smaller than or equal to N+1, and

wherein when the number of luma filters in the luma filter set is smaller than N+1, at least two luma filters with different filter indices have a same filter coefficient.

10 . The apparatus of claim 9 , wherein the first video region is a video picture, and the first syntax element is present in a picture header syntax element set.

11 . The apparatus of claim 9 , wherein the first video region is a video slice, and the first syntax element is present in a slice header syntax element set.

12 . The apparatus of claim 9 , wherein the first video region includes multiple video coding tree blocks, and the video coding tree block is split into multiple M*M video block, where M is equal to 2 or 4, and

wherein a same filter index is applied for samples in a same M*M video block.

13 . The apparatus of claim 9 , wherein the first adaptation parameter set includes an adaptive loop filtering adaptation parameter set.

14 . A non-transitory computer-readable storage medium storing instructions that cause a processor to:

determine, for a conversion between a first video region of a video and a bitstream of the video, a first syntax element corresponding to the first video region is present in the bitstream, wherein the first syntax element indicates an index of a first adaptation parameter set referred to by the first video region; and

perform the conversion based on the determining;

wherein in response to the determining, a value of a second syntax element included in the first adaptation parameter set is 1, and wherein the second syntax element indicates whether to include a luma filter set in the first adaptation parameter set,

wherein for a sample of the first video region, a filter index is derived based on multiple sample differences in different directions, and a specific luma filter is selected, based on the filter index, from the luma filter set in the first adaption parameter set and fixed filters which are not included in the luma filter set,

wherein a maximum value of the filter index is indicated by N, and a number of luma filters in the luma filter set is smaller than or equal to N+1, and

wherein when the number of luma filters in the luma filter set is smaller than N+1, at least two luma filters with different filter indices have a same filter coefficient.

15 . A method for storing a bitstream of a video comprising:

determining, for a first video region of the video, a first syntax element corresponding to the first video region is present in the bitstream, wherein the first syntax element indicates an index of a first adaptation parameter set referred to by the first video region;

generating the bitstream based on the determining; and

storing the bitstream in a non-transitory computer-readable recording medium,

wherein in response to the determining, a value of a second syntax element included in the first adaptation parameter set is 1, and wherein the second syntax element indicates whether to include a luma filter set in the first adaptation parameter set,

wherein for a sample of the first video region, a filter index is derived based on multiple sample differences in different directions, and a specific luma filter is selected, based on the filter index, from the luma filter set in the first adaption parameter set and fixed filters which are not included in the luma filter set,

wherein a maximum value of the filter index is indicated by N, and a number of luma filters in the luma filter set is smaller than or equal to N+1, and

wherein when the number of luma filters in the luma filter set is smaller than N+1, at least two luma filters with different filter indices have a same filter coefficient.

16 . The medium of claim 14 , wherein first video region is a video picture, and the first syntax element is present in a picture header syntax element set;

wherein the first video region is a video slice, and the first syntax element is present in a slice header syntax element set; and

wherein the first adaptation parameter set includes an adaptive loop filtering adaptation parameter set.

Assignments (2)

Priority Claims (1)

Continuity (3)

References Cited (92)