Methods and apparatus of unified intra merge mode with inheriting decoder side intra mode derivation in video coding systems

Abstract

A method and apparatus for deriving intra prediction for chroma blocks are disclosed. In particular, the present invention discloses methods of deriving intra prediction for chroma blocks by inheriting chroma intra prediction information from one or more candidates. According to this method, input data associated with a current block comprising a luma block and a chroma block is received, wherein the input data comprise pixel data to be encoded at an encoder side or data associated with the current block to be decoded at a decoder side. One or more candidates are determined for the chroma block in a chroma intra prediction mode. Chroma intra prediction information is inherited from said one or more candidates for the chroma block. Target chroma intra prediction is generated based on prediction information comprising the chroma intra prediction information inherited. The chroma block is encoded or decoded using the target chroma intra prediction.

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