ADAPTING THE SET OF POSSIBLE FREQUENCY TRANSFORMS BASED ON BLOCK SIZE AND INTRA MODE

摘要

In one example, a method of decoding video data, the method comprising: receiving information indicating that an intra-prediction mode for a block of video data is a DC intra-prediction mode; determining whether an edge is present in the block of video data;after determining that the edge is present in the block:determining an angle for the edge; and based on the information indicating that the intra-prediction mode is the DC intra-prediction mode and the determination that the edge is present in the block, inverse transforming the block using a directional inverse transform mapped from a directional intra-prediction mode having an angle that approximates the angle of the edge; and decoding the inverse transformed block.