Method and apparatus of inheriting shared cross-component linear model with history table in video coding system

Abstract

A method and apparatus for video coding using inherited cross-component models with history table design. According to the method, a prediction candidate list comprising one or more inherited cross-component prediction candidates from a cross-component model history table is determined, the inherited cross-component prediction candidates are inserted into the prediction candidate list according to a pre-defined order or the table is reset at particular position. A target model parameter set associated with a target inherited prediction model is determined based on an inherited model parameter set associated with the target inherited prediction model selected from the prediction candidate list. The second-colour block is encoded or decoded using prediction data comprising cross-colour prediction generated by applying the target inherited prediction model with the target model parameter set to reconstructed first-colour block. In another method, multiple cross-component model history tables are used.