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.
Claims8
A method for decoding, by a decoding apparatus, a bitstream for a coded video signal comprising at least one block, the method comprising:
- determining, by the decoding apparatus, prediction type information of a current block, the prediction type information indicating whether the current block is intra-coded or inter-coded;
- 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, the luma intra prediction mode specifying an intra prediction mode for luma samples of the current block;
- obtaining, by the decoding apparatus, index information of the current block from the bitstream, the index information being used to specify an intra prediction mode for chroma samples of the current block;
- deriving, by the decoding apparatus, a chroma intra prediction mode according to a predefined mapping table based on the determined luma intra prediction mode and the obtained index information;
- and
- decoding, by the decoding apparatus, the chroma samples of the current block based on the derived chroma intra prediction mode,
- wherein, when the obtained index information has a predefined value, the chroma intra prediction mode is set equal to the luma intra prediction mode.
An apparatus for decoding a bitstream for a coded video signal comprising at least one block, the apparatus comprising:
- a receiving unit configured to receive the bitstream;
- and
- a decoding unit configured to:
- determine prediction type information of a current block, the prediction type information indicating whether the current block is intra-coded or inter-coded,
- 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 specifying an intra prediction mode for luma samples of the current block,
- obtain index information of the current block from the bitstream, the index information being used to specify an intra prediction mode for chroma samples of the current block,
- derive a chroma intra prediction mode according to a predefined mapping table based on the determined luma intra prediction mode and the obtained index information, and
- decode the chroma samples of the current block based on the derived chroma intra prediction mode,
- wherein, when the obtained index information has a predefined value, the chroma intra prediction mode is set equal to the luma intra prediction mode.
Dependencies are inferred from the claim text.