US 12,356,021 B2
Method and apparatus for entropy-encoding and entropy-decoding video signal
Jaeho Lee, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on May 24, 2023, as Appl. No. 18/201,473.
Application 18/201,473 is a continuation of application No. 17/357,032, filed on Jun. 24, 2021, granted, now 11,700,398.
Application 17/357,032 is a continuation of application No. 16/645,400, granted, now 11,082,721, issued on Aug. 3, 2021, previously published as PCT/KR2018/013489, filed on Nov. 7, 2018.
Claims priority of provisional application 62/646,891, filed on Mar. 22, 2018.
Claims priority of provisional application 62/555,053, filed on Sep. 7, 2017.
Prior Publication US 2023/0300384 A1, Sep. 21, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/91 (2014.01); H04N 19/139 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01); H04N 19/51 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/91 (2014.11) [H04N 19/139 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/51 (2014.11); H04N 19/70 (2014.11)] 9 Claims
OG exemplary drawing
 
1. An apparatus of decoding a video signal including a current block, the apparatus comprising:
a processor configured to
derive affine coding information of a left block and a top block of the current block, wherein the affine coding information includes an affine flag indicating whether an affine motion prediction has been performed,
determine a context index of the affine flag of the current block based on the affine coding information of the left block and the top block,
entropy-decode the affine flag of the current block based on the context index,
parse an affine parameter flag representing whether 4 parameters or 6 parameters are used for an affine motion model based on the affine flag of the current block,
obtain a motion vector predictor based on the 4 parameters or the 6 parameters being used for the affine motion model, and
perform a prediction for the current block based on the motion vector predictor,
wherein the context index of the affine flag of the current block is determined based on a sum of a value determined based on the affine flag of the left block and a value determined based on the affine flag of the top block.