US 12,003,731 B2
Adaptive determination of multiple transform candidates for video coding
Bappaditya Ray, San Diego, CA (US); Vadim Seregin, San Diego, CA (US); and Marta Karczewicz, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 19, 2022, as Appl. No. 17/933,318.
Claims priority of provisional application 63/255,216, filed on Oct. 13, 2021.
Claims priority of provisional application 63/249,708, filed on Sep. 29, 2021.
Prior Publication US 2023/0099505 A1, Mar. 30, 2023
Int. Cl. H04N 19/136 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/60 (2014.01)
CPC H04N 19/136 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/60 (2014.11)] 29 Claims
OG exemplary drawing
 
1. A method of decoding video data, the method comprising:
determining a set of multiple transform selection (MTS) candidates for a current block of video data,
wherein determining the set comprises selecting the set, based on a number of non-zero coefficients of a transform block, between
a first set consisting of a single MTS candidate,
a second set of MTS candidates having at least four MTS candidates, and
a third set of MTS candidates having more MTS candidates than the second set, the MTS candidates of the second and third set being MTS candidates other than a DCT2 candidate;
determining one of the MTS candidates of the determined set of MTS candidates for the current block;
inverse transforming the transform block for the current block using the determined one of the MTS candidates to produce a residual block; and
decoding the current block using the residual block.