Method of Video Coding for Chroma Components

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 first chroma block and said one or more non-first chroma blocks, wherein the first chroma block and at least one non-first chroma block use separate chroma Intra prediction modes;
• and
• applying Intra prediction to the first chroma block and said one or more non-first chroma blocks using the chroma Intra prediction modes selected.

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, wherein the chroma Intra prediction modes include one or more cross-chroma linear model modes (LM_P modes);
• when one LM_P mode is selected for a current non-first chroma block, generating 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.

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;
• and
• applying chroma Intra prediction to the multiple chroma blocks using the chroma Intra prediction modes selected.