US 11,917,160 B2
DMVR-based inter-prediction method and device
Naeri Park, Seoul (KR); and Junghak Nam, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Jan. 18, 2022, as Appl. No. 17/577,671.
Application 17/577,671 is a continuation of application No. 17/391,500, filed on Aug. 2, 2021, granted, now 11,252,415.
Application 17/391,500 is a continuation of application No. PCT/KR2020/001788, filed on Feb. 7, 2020.
Claims priority of provisional application 62/805,950, filed on Feb. 14, 2019.
Prior Publication US 2022/0141468 A1, May 5, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/137 (2014.01); H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/137 (2014.11) [H04N 19/105 (2014.11); H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11)] 14 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining information on a prediction mode and residual information from a bitstream;
deriving a motion vector of a current block based on the information on the prediction mode;
deriving prediction samples for the current block based on the motion vector;
deriving residual samples for the current block based on the residual information; and
generating reconstructed samples for the current block based on the prediction samples and the residual samples,
wherein the deriving of the motion vector includes determining whether to apply a decoder-side motion vector refinement (DMVR) to the motion vector of the current block, based on a case where bi-prediction performed based on an L0 reference picture and an L1 reference picture is applied to the current block, a distance between a current picture and the L0 reference picture and a distance between the current picture and the L1 reference picture are equal, a value of merge mode with motion vector difference (MMVD) flag information related to whether or not MMVD is applied to the current block is equal to 0, and a value of bi-prediction weight index information of the current block is equal to 0,
wherein the deriving of the prediction samples includes determining whether to apply Bi-directional optical flow (BDOF) to the prediction samples, based on a case where the bi-prediction performed based on the L0 reference picture and the L1 reference picture is applied to the current block, a distance between the current picture and the L0 reference picture and a distance between the current picture and the L1 reference picture are equal, and a value of the bi-prediction weight index information of the current block is equal to 0.