US 12,389,039 B2
Video coding method on basis of secondary transform, 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 Mar. 20, 2024, as Appl. No. 18/611,214.
Application 18/611,214 is a continuation of application No. 18/099,131, filed on Jan. 19, 2023, granted, now 11,968,397.
Application 18/099,131 is a continuation of application No. 17/592,768, filed on Feb. 4, 2022, granted, now 11,582,486, issued on Feb. 14, 2023.
Application 17/592,768 is a continuation of application No. 17/350,790, filed on Jun. 17, 2021, granted, now 11,310,531, issued on Apr. 19, 2022.
Application 17/350,790 is a continuation of application No. PCT/KR2019/018071, filed on Dec. 19, 2019.
Claims priority of provisional application 62/782,294, filed on Dec. 19, 2018.
Prior Publication US 2024/0244262 A1, Jul. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/61 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/619 (2014.11) [H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11)] 3 Claims
OG exemplary drawing
 
1. A decoding apparatus for an image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
derive modified transform coefficients based on an inverse secondary transform using a transform kernel matrix for transform coefficients for a target block;
derive residual samples for the target block based on an inverse primary transform for the modified transform coefficients; and
generate a reconstructed picture based on the residual samples for the target block,
wherein the at least one processor is further configured to
derive the modified transform coefficients of a top-left 4×4 region, a top-right 4×4 region and a bottom-left 4×4 region of an 8×8 region by applying the transform kernel matrix to the transform coefficients of the top-left 4×4 region of the 8×8 region of the target block,
wherein the transform kernel matrix is a 48×16 matrix, and
wherein a matrix operation between the transform kernel matrix and the transform coefficients of the top-left 4×4 region is (48×16 matrix)*(16×1 transform coefficient vector).