US 12,425,574 B2
Local illumination compensation for bi-prediction
Xin Zhao, San Jose, CA (US); Guichun Li, San Jose, CA (US); Lien-Fei Chen, Hsinchu (TW); 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 Oct. 18, 2023, as Appl. No. 18/381,538.
Claims priority of provisional application 63/417,930, filed on Oct. 20, 2022.
Prior Publication US 2024/0137488 A1, Apr. 25, 2024
Prior Publication US 2024/0236300 A9, Jul. 11, 2024
Int. Cl. H04N 7/12 (2006.01); G06T 5/20 (2006.01); G06T 5/90 (2024.01); H04N 19/105 (2014.01); H04N 19/167 (2014.01); H04N 19/172 (2014.01); H04N 19/176 (2014.01); H04N 19/573 (2014.01)
CPC H04N 19/105 (2014.11) [G06T 5/20 (2013.01); G06T 5/90 (2024.01); H04N 19/167 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11); H04N 19/573 (2014.11); G06T 2207/10016 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of video decoding, comprising:
receiving coded information of a current block in a current picture from a coded video bitstream, the coded information being indicative of applying a local illumination compensation (LIC) on the current block according to at least a first reference block in a first reference picture;
determining, for a sample in the current block, at least a first reference sample in the first reference block, the first reference sample being co-located to the sample in the current block;
calculating a weighted sum of a plurality of terms and an offset for the LIC according to a plurality of parameter values for a plurality of parameters used in the LIC, the plurality of parameter values comprising at least a first weighting value for a first weighting that is applied to a non-linear term of the first reference sample of a kth power, wherein k comprises a power index value that is equal to 2; and
reconstructing the sample in the current block according to the weighted sum.