US 12,137,213 B2
Inter prediction-based image coding method and device
Naeri Park, Seoul (KR); Junghak Nam, Seoul (KR); and Hyeongmoon Jang, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Aug. 7, 2023, as Appl. No. 18/231,129.
Application 18/231,129 is a continuation of application No. 17/891,679, filed on Aug. 19, 2022, granted, now 11,902,511.
Application 17/891,679 is a continuation of application No. 17/550,812, filed on Dec. 14, 2021, granted, now 11,457,208, issued on Sep. 27, 2022.
Application 17/550,812 is a continuation of application No. PCT/KR2020/007717, filed on Jun. 15, 2020.
Claims priority of provisional application 62/861,983, filed on Jun. 14, 2019.
Prior Publication US 2023/0388486 A1, Nov. 30, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/00 (2014.01); H04N 19/105 (2014.01); H04N 19/137 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/137 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11)] 4 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including prediction related information from a bitstream;
deriving an inter prediction mode for a current block based on the prediction related information;
deriving reference picture lists for the current block;
deriving picture order count (POC) differences between each of reference pictures included in the reference picture lists and current picture;
deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) based on the POC differences; and
generating predicted samples based on the motion information,
wherein the reference picture indices for the SMVD are derived based on short-term reference pictures included in the reference picture lists,
wherein the POC differences include a first POC difference for reference picture list 0 (L0) and a second POC difference for reference picture list 1 (L1),
wherein the first POC difference for the L0 is a POC difference between a first short-term reference picture included in the L0 and the current picture, and the second POC difference for the L1 is a POC difference between a second short-term reference picture included in the L1 and the current picture, and
wherein a reference picture index of the L0 for the SMVD is derived based on the first POC difference, and a reference picture index of the L1 for the SMVD is derived based on the second POC difference.