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US 11,962,771 B2Granted
Syntax constraints in parameter set signaling of subpictures
AssigneesBeijing Bytedance Network Technology Co., Ltd., Bytedance Inc.
InventorsKai Zhang, Zhipin Deng, Hongbin Liu, Li Zhang, Jizheng Xu
Life of this patent
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Abstract
An example method of video processing includes performing a conversion between a picture of a video and a bitstream representation of the video. The picture includes one or more sub-pictures, and the bitstream representation conforms to a format rule that specifies that a length of a syntax element is equal to Ceil(Log 2(SS)) bits. SS is greater than 0, and the syntax element indicating a horizontal or a vertical position of a top-left corner of a coding tree unit of a sub-picture of the picture.
Claims18
A method of processing video data, comprising:
- determining, for a conversion between a video comprising a picture which is divided into one or more subpictures and a bitstream of the video, a position of a subpicture of the one or more subpictures based on a first syntax element and a second syntax element included in the bitstream;
- and
- performing the conversion based on the determining,
- wherein the first syntax element indicates a horizontal position of a top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the first syntax element is derived to be Ceil(Log 2(S1)) bits,
- wherein the second syntax element indicates a vertical position of the top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the second syntax element is derived to be Ceil(Log 2(S2)) bits,
- wherein S1 and S2 are greater than 0, and CtbSizeY denotes a size of a coding tree block, and
- wherein S1 is equal to (S3+CtbSizeY−1)/CtbSizeY, and S2 is equal to (S4+CtbSizeY−1)/CtbSizeY, wherein S3 is a value of a syntax element included in a sequence parameter set and specifying a maximum width of a decoded picture referring to the sequence parameter set in units of luma samples, and wherein S4 is a value of a syntax element included in the sequence parameter set and specifying a maximum height of a decoded picture referring to the sequence parameter set in units of luma samples.
4 more elements
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 video comprising a picture which is divided into one or more subpictures and a bitstream of the video, a position of a subpicture of the one or more subpictures based on a first syntax element and a second syntax element included in the bitstream;
- and
- perform the conversion based on the determining,
- wherein the first syntax element indicates a horizontal position of a top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the first syntax element is derived to be Ceil(Log 2(S1)) bits,
- wherein the second syntax element indicates a vertical position of the top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the second syntax element is derived to be Ceil(Log 2(S2)) bits,
- wherein S1 and S2 are greater than 0, and CtbSizeY denotes a size of a coding tree block, and
- wherein S1 is equal to (S3+CtbSizeY−1)/CtbSizeY, and S2 is equal to (S4+CtbSizeY−1)/CtbSizeY, wherein S3 is a value of a syntax element included in a sequence parameter set and specifying a maximum width of a decoded picture referring to the sequence parameter set in units of luma samples, and wherein S4 is a value of a syntax element included in the sequence parameter set and specifying a maximum height of a decoded picture referring to the sequence parameter set in units of luma samples.
4 more elements
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- determine, for a conversion between a video comprising a picture which is divided into one or more subpictures and a bitstream of the video, a position of a subpicture of the one or more subpictures based on a first syntax element and a second syntax element included in the bitstream;
- and
- perform the conversion based on the determining,
- wherein the first syntax element indicates a horizontal position of a top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the first syntax element is derived to be Ceil(Log 2(S1)) bits,
- wherein the second syntax element indicates a vertical position of the top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the second syntax element is derived to be Ceil(Log 2(S2)) bits,
- wherein S1 and S2 are greater than 0, and CtbSizeY denotes a size of a coding tree block, and
- wherein S1 is equal to (S3+CtbSizeY−1)/CtbSizeY, and S2 is equal to (S4+CtbSizeY−1)/CtbSizeY, wherein S3 is a value of a syntax element included in a sequence parameter set and specifying a maximum width of a decoded picture referring to the sequence parameter set in units of luma samples, and wherein S4 is a value of a syntax element included in the sequence parameter set and specifying a maximum height of a decoded picture referring to the sequence parameter set in units of luma samples.
4 more elements
A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:
- determining, for a video comprising a picture which is divided into one or more subpictures, a position of a subpicture of the one or more subpictures based on a first syntax element and a second syntax element included in the bitstream;
- and
- generating the bitstream based on the determining,
- wherein the first syntax element indicates a horizontal position of a top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the first syntax element is derived to be Ceil(Log 2(S1)) bits,
- wherein the second syntax element indicates a vertical position of the top-left coding tree unit of the subpicture in unit of CtbSizeY and a length of the second syntax element is derived to be Ceil(Log 2(S2)) bits,
- wherein S1 and S2 are greater than 0, and CtbSizeY denotes a size of a coding tree block, and
- wherein S1 is equal to (S3+CtbSizeY−1)/CtbSizeY, and S2 is equal to (S4+CtbSizeY−1)/CtbSizeY, wherein S3 is a value of a syntax element included in a sequence parameter set and specifying a maximum width of a decoded picture referring to the sequence parameter set in units of luma samples, and wherein S4 is the value of a syntax element included in the sequence parameter set and specifying a maximum height of a decoded picture referring to the sequence parameter set in units of luma samples.
4 more elements
Dependencies are inferred from the claim text.