US 12,284,346 B2
Systems and methods for partition dependent secondary transform
Xin Zhao, Palo Alto, CA (US); Madhu Peringassery Krishnan, Palo Alto, CA (US); and Shan Liu, Palo Alto, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on Mar. 3, 2023, as Appl. No. 18/117,218.
Claims priority of provisional application 63/318,262, filed on Mar. 9, 2022.
Prior Publication US 2023/0291900 A1, Sep. 14, 2023
Int. Cl. H04N 19/12 (2014.01); H04N 19/13 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/12 (2014.11) [H04N 19/13 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/61 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of processing a video stream performed at a computing system having memory and control circuitry, the method comprising:
receiving, from the video stream, a first control flag, wherein the first control flag indicates whether an inter-prediction mode is enabled for a video block of the video stream;
in accordance with a determination that the inter-prediction mode is enabled, determining whether multiple transform units are within the video block; and
in accordance with a determination that multiple transform units are within the video block:
determining a first transform unit of the multiple transform units to apply a first secondary transform based on a first relative location of the first transform unit within the video block;
applying the first secondary transform to the first transform unit; and
reconstructing the video block based at least on the first secondary transform.