US 11,800,110 B2
Adaptive scanning with multiple transform selection
Cheung Auyeung, Sunnyvale, CA (US); Xiang Li, Saratoga, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to Tencent America LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on Apr. 18, 2022, as Appl. No. 17/723,256.
Claims priority of provisional application 63/177,280, filed on Apr. 20, 2021.
Prior Publication US 2022/0337840 A1, Oct. 20, 2022
Int. Cl. H04N 19/129 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/12 (2014.01); H04N 19/159 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/129 (2014.11) [H04N 19/12 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/70 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of video processing in a decoder, comprising:
decoding information of a coding block from a bitstream, the information indicating an intra prediction mode for the coding block;
determining whether a selectable secondary non-separable transform is not applied to the bitstream and a selectable separable primary transform is applied to the bitstream;
in response to determining that the selectable secondary non-separable transform is not applied to the bitstream and the selectable separable primary transform is applied to the bitstream, determining residuals of the coding block from the bitstream based on a selection of a scan pattern from a plurality of scan pattern candidates indicated by the information and a selection of the selectable separable primary transform from a plurality of separable primary transform candidates indicated by the information;
in response to determining that the selectable secondary non-separable transform is applied to the bitstream and the selectable separable primary transform is not applied to the bitstream, determining the residuals of the coding block from the bitstream based on a fixed scan pattern; and
reconstructing the coding block based on a combination of the residuals with an intra prediction of the coding block, the intra prediction being based on the intra prediction mode.