US 11,991,385 B2
Image coding method and apparatus using motion vector
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 Apr. 7, 2023, as Appl. No. 18/132,225.
Application 18/132,225 is a continuation of application No. 17/846,499, filed on Jun. 22, 2022, granted, now 11,659,199.
Application 17/846,499 is a continuation of application No. 17/559,417, filed on Dec. 22, 2021, granted, now 11,451,821, issued on Sep. 20, 2022.
Application 17/559,417 is a continuation of application No. PCT/KR2020/008137, filed on Jun. 24, 2020.
Claims priority of provisional application 62/865,963, filed on Jun. 24, 2019.
Prior Publication US 2023/0283801 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/52 (2014.01); H04N 19/105 (2014.01); H04N 19/109 (2014.01); H04N 19/132 (2014.01); H04N 19/139 (2014.01); H04N 19/172 (2014.01); H04N 19/176 (2014.01); H04N 19/573 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/52 (2014.11) [H04N 19/105 (2014.11); H04N 19/109 (2014.11); H04N 19/132 (2014.11); H04N 19/139 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11); H04N 19/573 (2014.11); H04N 19/70 (2014.11)] 15 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
receiving image information including residual information and prediction related information including information on a motion vector difference (MVD) from a bitstream;
deriving an inter prediction mode for a current block in a current picture based on the prediction related information;
deriving motion information for the current block based on the inter prediction mode;
generating prediction samples based on the motion information;
generating residual samples based on the residual information; and
generating reconstructed samples of the current picture based on the prediction samples and the residual samples,
wherein the prediction related information includes inter prediction type information specifying whether bi-prediction is applied to the current block,
wherein the prediction related information further includes symmetric motion vector difference flag information specifying whether symmetric motion vector difference reference is applied, based on the inter prediction type information,
wherein based on the symmetric motion vector difference reference flag information, symmetric motion vector difference reference indices are derived from reference indices indicating short-term reference pictures,
wherein the symmetric motion vector difference reference indices are derived based on picture order count (POC) differences between each of the short-term reference pictures and the current picture,
wherein MVDL0 for L0 prediction is derived based on the information on the MVD, and
wherein MVDL1 for L1 prediction is derived based on the MVDL0.