Method and apparatus of regression-based prediction refinement improvement in video coding systems

Abstract

A method and apparatus of video coding for prediction refinement using regression-based method to improve coding efficiency are disclosed, where the prediction refinement is derived based on input signals comprising one or more residual terms. According to one method, a set of residual terms associated with a set of neighbouring positions of the current block are determined. One or more weight parameters are obtained for a linear equation, wherein the one or more weight parameters are associated with a regression-based model. Prediction refinement for a target prediction sample is determined according to the linear equation comprising the obtained one or more weight parameters and the set of residual terms. The target prediction sample is refined using the prediction refinement to generate a refined prediction sample. The current block is encoded or decoded by using prediction comprising the refined prediction sample.

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