Methods of coding colour pictures and apparatus for video coding

Abstract

A method and apparatus of video coding using refined prediction for cross-component prediction are disclosed. According to the method, a first chroma prediction is derived for a target chroma position in the current block based on one or more chroma prediction samples in the current block, wherein each of said one or more chroma prediction samples is derived by using one or more collocated luma samples according to a cross-component model. A prediction offset is derived for the target chroma position based on template samples at one or more positions in a template area of the current block. A refined chroma prediction is generated for the target chroma position by using the first chroma prediction and the prediction offset. A target chroma sample at the target chroma position is encoded or decoded using the refined chroma prediction.

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