US 11,722,658 B2
Method and apparatus for video coding
Guichun Li, Milpitas, CA (US); Xiang Li, Saratoga, CA (US); Bin Zhu, San Jose, 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. 25, 2021, as Appl. No. 17/358,797.
Prior Publication US 2022/0417496 A1, Dec. 29, 2022
Int. Cl. H04N 19/105 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01); H04N 19/159 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/70 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of video decoding in a decoder, comprising:
decoding prediction information of a current block in a current picture that is a part of a coded video bitstream, the prediction information comprising one reference picture index used in low delay inter bi-prediction for the current block, the one reference picture index corresponding to a first reference picture list;
determining, based on the one reference picture index, a first reference picture in the first reference picture list and inferring, based on the one reference picture index, a second reference picture in a second reference picture list for the current block, the current block being coded using the low delay inter bi-prediction, the first reference picture list being identical to the second reference picture list, and the first reference picture being identical to the second reference picture;
in response to a determination that (i) the current block is coded in one of a plurality of merge modes and (ii) the prediction information includes a constraint flag that indicates a same reference picture for a plurality of blocks including the current block, pruning a merge candidate list of the current block to remove all bi-prediction candidates having different reference index values between the first reference picture list and the second reference picture list; and
reconstructing the current block based on the first reference picture and the second reference picture.