US 11,800,126 B2
Video encoding using a directional mode and a non-separable transform
Xin Zhao, Santa Clara, CA (US); Liang Zhao, Sunnyvale, 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 May 31, 2022, as Appl. No. 17/828,919.
Application 17/828,919 is a continuation of application No. 17/031,272, filed on Sep. 24, 2020, granted, now 11,375,220.
Claims priority of provisional application 62/941,359, filed on Nov. 27, 2019.
Prior Publication US 2022/0295086 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 11/02 (2006.01); H04N 19/44 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/60 (2014.01); H04N 19/13 (2014.01)
CPC H04N 19/44 (2014.11) [H04N 19/13 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/60 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method for video encoding, comprising:
generating, by processing circuitry of an encoder, coding information of a block to be encoded and included in a coded video bitstream, the coding information indicating intra prediction information for the block; and
in response to the block being coded with a directional mode,
determining the directional mode based on a nominal mode and an angular offset, the generated coding information indicating the nominal mode and the angular offset,
determining a non-separable transform for the block based on the nominal mode, wherein the non-separable transform is a non-separable secondary transform, and
encoding the block based on the determined directional mode and the determined non-separable transform, wherein the encoding includes applying the non-separable secondary transform only to a first N transform coefficients that are consecutively arranged along a scanning order used for entropy coding transform coefficients of the block, wherein N is a positive integer, and not applying the non-separable secondary transform to remaining transform coefficients of the block.