US 11,818,343 B2
Sample offset with predefined filters
Xin Zhao, San Jose, CA (US); Yixin Du, Los Altos, 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 Jan. 4, 2022, as Appl. No. 17/568,540.
Claims priority of provisional application 63/160,537, filed on Mar. 12, 2021.
Prior Publication US 2022/0295054 A1, Sep. 15, 2022
Int. Cl. H04N 19/117 (2014.01); H04N 19/82 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01); H04N 19/132 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/132 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11); H04N 19/82 (2014.11)] 19 Claims
OG exemplary drawing
 
1. A method for in-loop filtering of a current video, comprising:
extracting at least one loop filtering parameter from a coded video bitstream of the current video for a reconstructed sample of a first color component in a current picture reconstructed from the coded video bitstream, the at least one loop filtering parameter comprising a flag;
determining based on the flag a type of a target sample offset filter to be applied to the reconstructed sample of the first color component, the type of the target sample offset filter being either of a first type or a second type, wherein a first value of the flag indicates that the target sample offset filter is a predefined fixed sample offset filter comprising a sample offset lookup table (LUT) with entries pretrained offline prior to encoding the current video and pre-configured among encoders and decoders, and wherein a second value of the flag indicates that an adaptive sample offset filter comprising a sample offset LUT with entries adaptively derived by encoders during encoding processes based on data contained in the current video, respectively;
identifying the target sample offset filter based at least on the determined type of the target sample offset filter; and
filtering the reconstructed sample of the first color component based on the target sample offset filter and a plurality of reconstructed reference samples of a second color component to generate a filtered reconstructed sample of the first color component.