US 11,943,456 B2
Transform-based image coding method and apparatus therefor
Moonmo Koo, Seoul (KR); Jaehyun Lim, Seoul (KR); and Seunghwan Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Jul. 11, 2022, as Appl. No. 17/861,785.
Application 17/861,785 is a continuation of application No. 17/581,154, filed on Jan. 21, 2022, granted, now 11,457,227.
Application 17/581,154 is a continuation of application No. PCT/KR2020/013039, filed on Sep. 25, 2020.
Claims priority of provisional application 62/906,696, filed on Sep. 26, 2019.
Claims priority of provisional application 62/906,066, filed on Sep. 25, 2019.
Prior Publication US 2022/0368926 A1, Nov. 17, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/18 (2014.01); H04N 19/124 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/60 (2014.01); H04N 19/70 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/18 (2014.11) [H04N 19/124 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/60 (2014.11); H04N 19/70 (2014.11); H04N 19/96 (2014.11)] 11 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
receiving residual information from a bitstream;
deriving prediction samples for a current block;
deriving transform coefficients for the current block based on the residual information;
deriving residual samples by applying at least one of LFNST and MTS to the transform coefficients; and
generating a reconstructed picture based on the prediction samples and the residual samples,
wherein the LFNST is performed based on an LFNST kernel related to an LFNST index;
wherein the MTS is performed based on an MTS kernel related to an MTS index;
wherein the LFNST index is parsed before the MTS index, and
wherein the MTS index is signaled based on a value of the LFNST index.