US 11,659,186 B2
Transform-based image coding method, and device for same
Moonmo Koo, Seoul (KR); Seunghwan Kim, Seoul (KR); and Jaehyun Lim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Jun. 30, 2022, as Appl. No. 17/854,540.
Application 17/854,540 is a continuation of application No. PCT/KR2021/000323, filed on Jan. 11, 2021.
Claims priority of provisional application 62/959,812, filed on Jan. 10, 2020.
Prior Publication US 2022/0345713 A1, Oct. 27, 2022
Int. Cl. H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/186 (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:
receiving flag information related to whether a scaling list is available when performing an LFNST, an LFNST index for a current block, and residual information;
determining whether the scaling list is applied to the current block based on the flag information, the LFNST index, and a tree type of the current block;
deriving transform coefficients for the current block from the residual information based on a determination result; and
deriving modified transform coefficients by applying the LFNST to the transform coefficients,
wherein based on the tree type of the current block is-being a single tree and the current block being a luma component, the scaling list is not applied, and
wherein based on the tree type of the current block being the single tree and the current block being a chroma component, the scaling list is applied.