Patent ID: 11871010
Assignee: QUALCOMM INCORPORATED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 27:
28. A device for decoding video data, the device comprising:
means for determining a number of allowed non-zero coefficients for a block of video data based on a size of the block;
means for obtaining a set of dequantized coefficients for the block of video data, wherein the set of dequantized coefficients comprises a first subset of dequantized coefficients that includes non-zero dequantized coefficients and a second subset of dequantized coefficients that includes all zero coefficients;
means for determining an intra prediction mode for the block of video data;
means for determining, based on the intra prediction mode, a set of inverse LFNST candidates from a plurality of sets, wherein the plurality of sets includes 35 sets, wherein the means for determining the set of inverse LFNST candidates comprises means for determining an index indicative of the set of inverse LFNST candidates from the plurality of sets based on the inter prediction mode, and the means for determining the index comprising means for determining the index to be equal to:
for values of the intra prediction mode between 0 and 34, the value of the intra prediction mode; and
for values of the intra prediction mode between 35 and 66, 68 minus the value of the intra prediction mode;

means for selecting an inverse LFNST from the determined set of inverse LFNST candidates;
means for applying the inverse low-frequency non-separable transform (LFNST) to the first subset of dequantized coefficients to determine a first intermediate subset of coefficients; and
means for applying an inverse separable transform to the first intermediate subset of coefficients and at least a portion of the second subset of coefficients to determine a block of reconstructed residual values.