Granted Patent B2

US 12,464,142 · App. 18/469,230 · Granted Nov 4, 2025

Inventors: Weijia Zhu (San Diego, CA); Li Zhang (San Diego, CA); Jizheng Xu (San Diego, CA)

Assignee: Bytedance Inc.

H04N19/186H04N19/119H04N19/159H04N19/176H04N19/593H04N19/96

Abstract

Claims (61)

1 . A method of processing video data, comprising:

determining, for a conversion between a block of a video and a bitstream of the video, a maximum number of entries of a palette of the block to be used in a prediction mode, based on a partitioning structure of the block; and

performing the conversion based on the determining,

wherein, in the prediction mode, reconstructed samples are represented by a set of representative color values, and the set of representative color values comprises at least one of 1) palette predictors, 2) escape samples, or 3) palette information included in the bitstream,

wherein the maximum number of entries of the palette for blocks with a single tree partitioning structure is different than that for blocks with a dual tree partitioning structure,

wherein when the block satisfies conditions including a first condition based on the slice type that the block has a first slice type, a second condition based on the color component that the block is a luma block, and a third condition based on the partitioning structure that the block has a dual tree partitioning structure, the maximum number of entries of the palette for the block is greater than that for a chroma block corresponding to the block.

2 . The method of claim 1 , wherein the one or more conditions comprises that the block has a first color format, and a chroma block corresponding to the block has a first size.

3 . The method of claim 2 , wherein the first color format is 4:2:0.

4 . The method of claim 2 , wherein the one or more conditions further comprises that the block is obtained from a first split type.

5 . The method of claim 1 , wherein when the block is a luma block satisfying the one or more conditions, the prediction mode is disallowed for the chroma block.

6 . The method of claim 1 , wherein, the maximum number of entries of the palette is further determined based on coded information of the block.

7 . The method of claim 1 , wherein, the maximum number of entries of the palette is further determined based on a dimension of the block.

8 . The method of claim 1 , wherein in the dual tree partitioning structure, a coding tree unit is split with a luma partition scheme and a chroma partition scheme, and wherein the luma partition scheme has same recursive partition tree types with the chroma partition scheme until reaching a size threshold.

9 . The method of claim 1 , wherein the first slice type is not a I slice.

10 . The method of claim 1 , wherein the conversion includes encoding the block into the bitstream.

11 . The method of claim 1 , wherein the conversion includes decoding the block from the bitstream.

12 . 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 block of a video and a bitstream of the video, a maximum number of entries of a palette of the block to be used in a prediction mode, based on a partitioning structure of the block; and

perform the conversion based on the determining,

wherein, in the prediction mode, reconstructed samples are represented by a set of representative color values, and the set of representative color values comprises at least one of 1) palette predictors, 2) escape samples, or 3) palette information included in the bitstream,

wherein the maximum number of entries of the palette for blocks with a single tree partitioning structure is different than that for blocks with a dual tree partitioning structure,

wherein when the block satisfies conditions including a first condition based on the slice type that the block has a first slice type, a second condition based on the color component that the block is a luma block, and a third condition based on the partitioning structure that the block has a dual tree partitioning structure, the maximum number of entries of the palette for the block is greater than that for a chroma block corresponding to the block.

13 . The apparatus of claim 12 , wherein the one or more conditions comprises that the block has a first color format, and a chroma block corresponding to the block has a first size,

wherein the first color format is 4:2:0,

wherein when the block is a luma block satisfying the one or more conditions, the prediction mode is disallowed for the chroma block,

wherein in the dual tree partitioning structure, a coding tree unit is split with a luma partition scheme and a chroma partition scheme, and wherein the luma partition scheme has same recursive partition tree types with the chroma partition scheme until reaching a size threshold,

wherein the first slice type is not a I slice, and

wherein the one or more conditions further comprises that the block is obtained from a first split type.

14 . The apparatus of claim 12 , wherein, the maximum number of entries of the palette is further determined based on coded information of the block,

wherein, the maximum number of entries of the palette is further determined based on a dimension of the block.

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

determine, for a conversion between a block of a video and a bitstream of the video, a maximum number of entries of a palette of the block to be used in a prediction mode, based on a partitioning structure of the block; and

perform the conversion based on the determining,

wherein, in the prediction mode, reconstructed samples are represented by a set of representative color values, and the set of representative color values comprises at least one of 1) palette predictors, 2) escape samples, or 3) palette information included in the bitstream,

wherein the maximum number of entries of the palette for blocks with a single tree partitioning structure is different than that for blocks with a dual tree partitioning structure,

wherein when the block satisfies conditions including a first condition based on the slice type that the block has a first slice type, a second condition based on the color component that the block is a luma block, and a third condition based on the partitioning structure that the block has a dual tree partitioning structure, the maximum number of entries of the palette for the block is greater than that for a chroma block corresponding to the block.

16 . The non-transitory computer-readable storage medium of claim 15 ,

wherein the one or more conditions comprises that the block has a first color format, and a chroma block corresponding to the block has a first size,

wherein the first color format is 4:2:0,

wherein when the block is a luma block satisfying the one or more conditions, the prediction mode is disallowed for the chroma block,

wherein, the maximum number of entries of the palette is further determined based on coded information of the block,

wherein, the maximum number of entries of the palette is further determined based on a dimension of the block,

wherein in the dual tree partitioning structure, a coding tree unit is split with a luma partition scheme and a chroma partition scheme, and wherein the luma partition scheme has same recursive partition tree types with the chroma partition scheme until reaching a size threshold,

wherein the first slice type is not a I slice, and

wherein the one or more conditions further comprises that the block is obtained from a first split type.

17 . A method for storing a bitstream of a video, comprising:

determining, for a block of a video, a maximum number of entries of a palette of the block to be used in a prediction mode, based on a partitioning structure of the block;

generating the bitstream based on the determining; and

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

wherein, in the prediction mode, reconstructed samples are represented by a set of representative color values, and the set of representative color values comprises at least one of 1) palette predictors, 2) escape samples, or 3) palette information included in the bitstream,

wherein the maximum number of entries of the palette for blocks with a single tree partitioning structure is different than that for blocks with a dual tree partitioning structure,

wherein when the block satisfies conditions including a first condition based on the slice type that the block has a first slice type, a second condition based on the color component that the block is a luma block, and a third condition based on the partitioning structure that the block has a dual tree partitioning structure, the maximum number of entries of the palette for the block is greater than that for a chroma block corresponding to the block.

18 . The method of claim 17 ,

wherein the one or more conditions comprises that the block has a first color format, and a chroma block corresponding to the block has a first size,

wherein the first color format is 4:2:0,

wherein when the block is a luma block satisfying the one or more conditions, the prediction mode is disallowed for the chroma block,

wherein, the maximum number of entries of the palette is further determined based on coded information of the block,

wherein, the maximum number of entries of the palette is further determined based on a dimension of the block,

wherein in the dual tree partitioning structure, a coding tree unit is split with a luma partition scheme and a chroma partition scheme, and wherein the luma partition scheme has same recursive partition tree types with the chroma partition scheme until reaching a size threshold,

wherein the first slice type is not a I slice, and

wherein the one or more conditions further comprises that the block is obtained from a first split type.

Assignments (1)

Priority Claims (1)

Continuity (3)

References Cited (237)