US 12,262,046 B2
Inter-prediction-based image encoding/decoding method and apparatus, and recording medium storing bitstream
Hendry Hendry, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/801,497
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Feb. 25, 2021, PCT No. PCT/KR2021/002347
§ 371(c)(1), (2) Date Aug. 22, 2022,
PCT Pub. No. WO2021/172881, PCT Pub. Date Sep. 2, 2021.
Claims priority of provisional application 62/981,518, filed on Feb. 25, 2020.
Prior Publication US 2023/0082043 A1, Mar. 16, 2023
Int. Cl. H04N 19/52 (2014.01); H04N 19/105 (2014.01); H04N 19/109 (2014.01); H04N 19/174 (2014.01); H04N 19/176 (2014.01); H04N 19/577 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/52 (2014.11) [H04N 19/105 (2014.11); H04N 19/109 (2014.11); H04N 19/174 (2014.11); H04N 19/176 (2014.11); H04N 19/577 (2014.11); H04N 19/70 (2014.11)] 11 Claims
OG exemplary drawing
 
1. An image decoding method comprising:
determining an inter-prediction mode of a current block;
deriving motion information of the current block according to the determined inter-prediction mode; and
obtaining a prediction block of the current block, based on the derived motion information,
wherein the prediction block is obtained based on weighted prediction information for explicit weighted prediction of the current block,
wherein the weighted prediction information includes weight number information,
wherein the weight number information includes L0 weight number information specifying a number of weights signaled in an L0 direction and L1 weight number information specifying a number of weights signaled in an L1 direction,
wherein the L0 weight number information is adaptively signaled based on a first flag specifying a position at which the weighted prediction information could be present while the L1 weight number information is adaptively signaled based on the first flag and a second flag indicating whether the explicit weighted prediction is applied to a bi-predictive (B) slice,
wherein the first flag equal to 1 specifies that the weighted prediction information could be present in a picture header, and the first flag equal to 0 specifies that the weighted prediction information could be present in the slice header,
wherein the second flag equal to 1 specifies that the explicit weighted prediction is applied to the B slice, and the second flag equal to 0 specifies that the explicit weighted prediction is not applied to the B slice, and
wherein, based on the first flag and the second flag being equal to 1, the L1 weight number information is signaled from a bitstream.