Linear-model prediction with non-square prediction units in video coding

摘要

A video coder reconstructs a set of chroma reference samples and reconstructs luma samples of a non-square prediction unit. Additionally, the video coder sub-samples the set of luma reference samples such that a total number of the luma reference samples that neighbor a longer side of the non-square prediction block is the same as a total number of the luma reference samples that neighbor a shorter side of the non-square prediction block. The video coder determines a Linear Model (LM) parameter based on formula