US 12,439,073 B2
Transform coefficient zero-out
Xin Zhao, San Jose, 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 Jun. 27, 2023, as Appl. No. 18/342,320.
Application 18/342,320 is a continuation of application No. 17/447,157, filed on Sep. 8, 2021, granted, now 11,750,831.
Application 17/447,157 is a continuation of application No. 16/787,628, filed on Feb. 11, 2020, granted, now 11,190,794, issued on Nov. 30, 2021.
Claims priority of provisional application 62/804,666, filed on Feb. 12, 2019.
Prior Publication US 2023/0336763 A1, Oct. 19, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/48 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/91 (2014.01)
CPC H04N 19/48 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/91 (2014.11)] 15 Claims
OG exemplary drawing
 
1. A method for video decoding in a decoder, the method comprising:
decoding coded information of a transform block (TB) from a coded video bitstream;
when the coded information indicates that a first region of the TB includes a first sub-region and a second sub-region with transform coefficients calculated by a secondary transform, determining whether the secondary transform is performed on the first region, wherein the transform coefficients of the second sub-region are set to 0; and
when the secondary transform is determined to be performed on the first region that includes the second sub-region with the transform coefficients set to 0, determining that transform coefficients of a second region in the TB are 0, wherein the second region is outside the first region.