Colour picture processing method and colour video processing apparatus

Abstract

A method and apparatus for ALF with taps generated from cross-component models are disclosed. According to one method, high-level syntax element sets indicating available block sizes and cross-component models associated with ALF-CCCM are determined. One or more indexes for the current block or CTB to indicate a selected block size and a selected cross-component model from the high-level syntax element sets are determined. An ALF-CCCM process is applied to the current block using the selected block size and cross-component model to generate an ALF-CCCM correction term. The ALF-CCCM correction term is provided to refine a prediction of the chroma component of the current block. According to another method, shared syntax information comprising at least a shared block size or a shared cross-component model common to a CC-ALF and at least one of a chroma ALF and a ALF-CCCM is used.

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