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US 10,321,156 B2Granted
Method and apparatus for processing video data
AssigneeLG Electronics Inc.
InventorsJungsun Kim, Seungwook Park, Jaehyun Lim, Joonyoung Park, Younghee Choi, Jaewon Sung, Byeongmoon Jeon, Yongjoon Jeon
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Abstract
A method for signalling an intra chroma prediction mode and a method for implementing the signalled intra chroma prediction mode, the intra chroma prediction mode taking an intropolation of previously predicted luma samples from neighboring blocks of video data to attain an intra chroma prediction of a current chroma prediction unit.
Claims18
A method for decoding a bitstream for a video signal by a decoding apparatus, the method comprising:
- obtaining, by the decoding apparatus, prediction type information of a current block from the bitstream, the prediction type information specifying whether the current block is coded in inter mode or intra mode;
- determining, by the decoding apparatus, a luma intra prediction mode of the current block when the prediction type information indicates that the current block is intra-coded, wherein the luma intra prediction mode is an intra prediction mode for a luma sample of the current block;
- obtaining, by the decoding apparatus, intra chroma prediction mode information of the current block from the bitstream, the intra chroma prediction mode information specifying a chroma intra prediction mode of the current block, wherein the chroma intra prediction mode is an intra prediction mode for a chroma sample of the current block;
- determining, by the decoding apparatus, the chroma intra prediction mode of the current block according to a predefined table based on the determined luma intra prediction mode and the obtained intra chroma prediction mode information of the current block, wherein, when the intra chroma prediction mode information has a specific value, the chroma intra prediction mode of the current block is set equal to the luma intra prediction mode of the current block;
- and
- decoding, by the decoding apparatus, the chroma sample of the current block based on the determined chroma intra prediction mode.
3 more elements
An apparatus for decoding a bitstream for a video signal, the apparatus comprising:
- a decoding unit configured to obtain prediction type information of a current block from the bitstream, the prediction type information specifying whether the current block is coded in inter mode or intra mode, configured to determine a luma intra prediction mode of the current block when the prediction type information indicates that the current block is intra-coded, the luma intra prediction mode being an intra prediction mode for a luma sample of the current block, configured to obtain intra chroma prediction mode information of the current block from the bitstream, the intra chroma prediction mode information specifying a chroma intra prediction mode of the current block, wherein the chroma intra prediction mode is an intra prediction mode for a chroma sample of the current block, configured to determine the chroma intra prediction mode of the current block according to a predefined table based on the determined luma intra prediction mode and the obtained intra chroma prediction mode information of the current block, and configured to decode the chroma sample of the current block based on the determined chroma intra prediction mode,
- wherein, when the intra chroma prediction mode information has a specific value, the chroma intra prediction mode of the current block is set equal to the luma intra prediction mode of the current block.
Dependencies are inferred from the claim text.