	US 12,132,922 B2
	Method and apparatus for processing video signals using reduced transform
Seunghwan Kim, Seoul (KR); Mehdi Salehifar, Seoul (KR); Moonmo Koo, Seoul (KR); and Jaehyun Lim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Jun. 3, 2023, as Appl. No. 18/205,501.
Application 18/205,501 is a continuation of application No. 17/671,946, filed on Feb. 15, 2022, granted, now 11,711,533.
Application 17/671,946 is a continuation of application No. 16/429,956, filed on Jun. 3, 2019, granted, now 11,284,097.
Claims priority of provisional application 62/679,939, filed on Jun. 3, 2018.
Claims priority of provisional application 62/679,940, filed on Jun. 3, 2018.
Prior Publication US 2023/0396788 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/44 (2014.01); H04N 19/105 (2014.01); H04N 19/11 (2014.01); H04N 19/119 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01); H04N 19/625 (2014.01)

CPC H04N 19/44 (2014.11) [H04N 19/105 (2014.11); H04N 19/11 (2014.11); H04N 19/119 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/625 (2014.11)]

6 Claims

1. A decoding apparatus for image decoding configured for

determining transform kernels of a current block based on one transform kernel set of five transform kernel sets pre-defined in the decoding apparatus,

determining a size of a non-zero region for an inverse primary transform based on the transform kernels of the current block and a size of the current block, and

performing the inverse primary transform on the non-zero region based on the transform kernels of the current block,

wherein each of the five transform kernel sets is representative of a pair of a horizontal transform kernel and a vertical transform kernel,

wherein the five transform kernel sets include a first transform kernel set of (DCT2, DCT2), a second transform kernel set of (DST7, DST7), a third transform kernel set of (DCT8, DST7), a fourth transform kernel set of (DST7, DCT8), and a fifth transform kernel set of (DCT8, DCT8),

wherein based on the size of the current block being 32×32 and the one transform kernel set for the transform kernels of the current block being the first transform kernel set, the size of the non-zero region is determined as 32×32, and

wherein based on the size of the current block being 32×32 and the one transform kernel set for the transform kernels of the current block being one of the second to fifth transform kernel sets, the size of the non-zero region is determined as 16×16.