Method and apparatus for video encoding and decoding based on an improved decision-making process for local illuminance compensation templates

Abstract

The present disclosure relates to a video compression technology and in particular an improvement of the local illumination compensation (LIC) technology included in the predictive coding technology, which contributes to improving the compression performance in a video encoder and a decoder.According to an exemplary embodiment of the present disclosure, a method for decoding an encoded video bitstream comprises: extracting local illumination compensation (LIC) information for a current block from the bitstream and obtaining LIC information from the extracted information; determining at least one linear model based on the LIC information; generating prediction samples for the current block using an LIC method with the linear model; and reconstructing the current block using the prediction samples, wherein the linear model is defined by at least one first-order function or one second-order function.