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1. US20170366818 - Method of video coding for chroma components

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. A method of video decoding for chroma components using Intra prediction, the method comprising:
receiving a video bitstream for coded video data;
deriving, from the video bitstream, residual data associated with multiple chroma blocks corresponding to multiple chroma components in a current color block, wherein the multiple chroma blocks in the current color block comprise a first chroma block and one or more non-first chroma blocks;
determining chroma Intra prediction modes from the video bitstream for the multiple chroma blocks in the current color block, wherein the chroma Intra prediction modes include one or more cross-chroma linear model modes (LM_P modes), and each LM_P mode of the one or more LM_P modes generates, independent of luma data, chroma Intra prediction data for a chroma block;
when one LM_P mode of the one or more LM_P modes is selected for a current non-first chroma block of the multiple chroma blocks, generating the chroma Intra prediction data for the current non-first chroma block based on another chroma block in the current color block according to a linear model; and
applying chroma Intra prediction decoding to the residual data associated with the current non-first chroma block to reconstruct the current non-first chroma block using the chroma Intra prediction data.
2. The method of claim 1, wherein said one or more LM_P modes comprises Top+Left LM_P mode, Top-Only LM_P mode, and Left-Only LM_P mode.
3. The method of claim 1, wherein one or more syntax elements are signaled to indicate chroma Intra prediction modes selected from one or more chroma mode candidate lists for the multiple chroma blocks in the current color block, and wherein at least one chroma mode candidate list includes said one or more LM_P modes.
4. The method of claim 3, wherein said one or more LM_P modes are binarized with equal-length codewords in a same way as LM modes in the one or more chroma mode candidate lists for the multiple chroma blocks in the current color block, wherein said one or more chroma mode candidate lists include said one or more LM_P modes.
5. The method of claim 3, wherein when all of the multiple chroma blocks share a same chroma Intra prediction mode and an LM_P mode is selected for the multiple chroma blocks, the chroma Intra prediction data for the first chroma block is generated according to a non-LM_P mode.
6. The method of claim 5, wherein the chroma Intra prediction data for the first chroma block is generated according to Top+Left LM mode, and wherein the chroma Intra prediction data for the first chroma block is generated by using neighboring reconstructed luma data to derive linear model parameters and using the reconstructed luma data in the current color block as prediction reference.
7. The method of claim 1, wherein when one LM_P mode is selected for the current non-first chroma block, linear model parameters of the linear model are generated based on reconstructed chroma samples.
8. The method of claim 1, wherein when one LM_P mode is selected for the current non-first chroma block, one part of linear model parameters of the linear model is generated based on reconstructed chroma samples and another part of the linear model parameters of the linear model is signaled in the video bitstream.
9. A method of video coding for chroma components using Intra prediction, the method comprising:
receiving input data associated with multiple chroma blocks corresponding to multiple chroma components in a current color block, wherein the multiple chroma blocks in the current color block comprise a first chroma block and one or more non-first chroma blocks;
selecting chroma Intra prediction modes for the multiple chroma blocks, wherein the chroma Intra prediction modes include one or more cross-chroma linear model modes (LM_P modes) to generate chroma Intra prediction data for a non-first chroma block based on another chroma block in the current color block according to a linear model, wherein each LM_P mode of the one or more LM_P modes generates, independent of luma data, the chroma Intra prediction data; and
applying chroma Intra prediction to the multiple chroma blocks using the chroma Intra prediction modes selected.
10. The method of claim 1, wherein each LM_P mode of the one or more LM_P modes generates the chroma Intra prediction data for the chroma block without utilizing luma data as a prediction reference.