Method and apparatus for encoding intra prediction mode for each chroma component

A method performed by a video encoding device for encoding an intra-prediction mode of a current chroma block, the method comprising:

• determining first intra-prediction mode information for a first chroma channel of the current chroma block;
• and
• determining second intra-prediction mode information for a second chroma channel of the current chroma block,
• wherein the first intra-prediction mode information comprises at least one of a first cross-component prediction mode flag (CCP mode flag), a first cross-component prediction mode index (CCP mode index), or a first chroma intra-prediction mode indicator, and the second intra-prediction mode information comprises at least one of a second CCP mode flag, a second CCP mode index, and or a second chroma intra-prediction mode indicator, and wherein the method further comprises, when the first CCP mode flag and the second CCP mode flag are different, encoding either of the second CCP mode index indicating one of CCP mode candidates or the second chroma intra-prediction mode indicator indicating one of intra-prediction mode candidates.

A method for transmitting encoded video data comprising a bitstream, the method comprising:

• generating the bitstream for a current block in an image;
• and
• transmitting the bitstream;
• wherein generating the bitstream for the image comprises:
• determining first intra-prediction mode information for a first chroma channel of a current chroma block;
• and
• determining second intra-prediction mode information for a second chroma channel of the current chroma block,
• wherein the first intra-prediction mode information comprises at least one of a first cross-component prediction mode flag (CCP mode flag), a first cross-component prediction mode index (CCP mode index), or a first chroma intra-prediction mode indicator, and the second intra-prediction mode information comprises at least one of a second CCP mode flag, a second CCP mode index, or a second chroma intra-prediction mode indicator, and
• wherein the method further comprises, when the first CCP mode flag and the second CCP mode flag are different, encoding either of the second CCP mode index indicating one of CCP mode candidates or the second chroma intra-prediction mode indicator indicating one of intra-prediction mode candidates.