US 12,452,458 B2
Method for processing video signal by using transform, 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 Mar. 12, 2024, as Appl. No. 18/602,103.
Application 18/602,103 is a continuation of application No. 17/420,196, granted, now 11,943,479, previously published as PCT/KR2020/000066, filed on Jan. 2, 2020.
Claims priority of provisional application 62/787,354, filed on Jan. 1, 2019.
Prior Publication US 2024/0357176 A1, Oct. 24, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/625 (2014.01); H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/625 (2014.11) [H04N 19/105 (2014.11); H04N 19/132 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/70 (2014.11)] 3 Claims
OG exemplary drawing
 
1. A method for decoding image information, the method comprising:
determining a horizontal transform type index for a horizontal transform kernel and a vertical transform type index for a vertical transform kernel of a transform block in the image information;
determining a transform region in which a significant transform coefficient exists in the transform block based on the horizontal transform type index, the vertical transform type index, and a width and a height of the transform block; and
applying, using a transformation matrix, inverse-transform to the transform region based on the horizontal transform type index and the vertical transform type index,
wherein the transformation matrix is derived as a transformation matrix, which has 32 columns and 16 rows, based on at least one of (i) the horizontal transform type index being greater than 0 and the width of the transform block being 32 or (ii) the vertical transform type index being greater than 0 and the height of the transform block being 32.