QUALCOMM Incorporated
LOW-FREQUENCY NON-SEPARABLE TRANSFORM (LFNST) WITH REDUCED ZERO-OUT IN VIDEO CODING

Abstract:

An example device for decoding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine that a transform block of video data has a size of 8 8 coefficients and that the transform block is transformed using a low-frequency non-separable transform (LFNST); decode at least nine non-zero transform coefficients of the transform block; inverse transform the transform block using an inverse LFNST to reproduce a residual block corresponding to the transform block; and reconstruct a block of the video data using the residual block.