Cross component end of block flag coding
AssigneeTencent America LLC
InventorsXin Zhao, Madhu Peringassery Krishnan, Shan Liu
Life of this patent
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Abstract
Methods, apparatus, and computer readable storage medium for encoding/decoding video data in a decoder. The method includes receiving a first End of Block (EOB) flag associated with a first color component of a data block from the video data; deriving a context for entropy encoding the first EOB flag based on a second EOB flag associated with a second color component of the data block of the video data; and performing entropy decoding of the first EOB flag based on the derived context.
Claims20
A method for decoding video data in a decoder, the method comprising:
- receiving a first End of Block (EOB) flag associated with a first color component of a data block from the video data, wherein the first color component is one of Cr, Cb, or luma component of the data block;
- determining a value for a second EOB flag associated with a second color component of the data block of the video data, wherein the second color component of the data block is another of the Cr, Cb, or luma color component of the data block that is co-located with the first color component of the data block such that they are in a same spatial position;
- deriving a context for entropy encoding the first EOB flag based on the determined value of the second EOB flag by:
- selecting a first predefined context for encoding the first EOB associated with the first color component when the second EOB is of a first value;
- and
- selecting a second predefined context different from the first predefined context for encoding the first EOB associated with the first color component when the second EOB is of a second value;
- and
- entropy decoding of the first EOB flag based on the derived context.
A method for decoding video data in a decoder, the method comprising:
- receiving a joint EOB flag associated with color components of a data block from the video data, wherein the joint EOB flag is indicative of an EOB flag value for each of the color components of the data block, wherein the joint EOB flag is signaled using one of:
- a single syntax with 8 different values indicating unique combinations of different EOB flag values for a luma color component, a Cr color component, and a Cb color component;
- or
- a single syntax with 4 different values indicating unique combinations of different EOB flag values for a Cr color component and a Cb color component;
- and
- processing the color components of the data block based on the joint EOB flag.
A method for decoding video data in a decoder, the method comprising:
- receiving a first flag associated with two chroma color components of a data block from the video data, the first flag indicating whether EOB flags each associated with one of the two chroma color components of the data block are equal;
- receiving a second flag indicating an EOB flag value of the one of the two chroma color components of the data block;
- and
- in response to the first flag indicating that the EOB flags each associated with one of the two chroma color components of the data block being equal, deriving EOB flag values for the each of the two chroma color components of the data block based on the second flag.
A method for decoding video data in a decoder, the method comprising:
- receiving a first flag associated with two chroma color components of a data block and a luma color component of the data block with the two chroma color components, the first flag indicating whether EOB flags each associated with one of the two chroma color components of the data block and the luma color component of the data block are equal;
- receiving a second flag indicating an EOB flag value of the luma color component of the data block;
- deriving an EOB flag value of the luma color component of the data block based on the second flag;
- and
- in response to the first flag indicating that the EOB flags each associated with one of the two chroma color components of the data block and the luma color component of the data block being equal, deriving EOB flag values for the each of the two chroma color components of the data block based on the second flag.
Dependencies are inferred from the claim text.