US 12,137,216 B2
Method and apparatus for processing image signal
Moonmo Koo, Seoul (KR); Mehdi Salehifar, 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 Nov. 27, 2023, as Appl. No. 18/519,996.
Application 18/519,996 is a continuation of application No. 18/084,127, filed on Dec. 19, 2022, granted, now 11,870,982.
Application 18/084,127 is a continuation of application No. 17/476,696, filed on Sep. 16, 2021, granted, now 11,563,937, issued on Nov. 16, 2021.
Application 17/476,696 is a continuation of application No. 17/168,571, filed on Feb. 5, 2021, granted, now 11,153,560, issued on Oct. 19, 2021.
Application 17/168,571 is a continuation of application No. PCT/KR2019/010231, filed on Aug. 12, 2019.
Claims priority of provisional application 62/717,890, filed on Aug. 12, 2018.
Prior Publication US 2024/0098258 A1, Mar. 21, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/11 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/11 (2014.11) [H04N 19/176 (2014.11); H04N 19/61 (2014.11)] 7 Claims
OG exemplary drawing
 
1. An apparatus for decoding an image signal, comprising:
a memory;
at least one processor connected to the memory, the at least one processor configured to:
determine a modified intra prediction mode of a current block from an intra prediction mode, based on a ratio between a width and height of the current block and the intra prediction mode,
determine an inverse non-separable transform set based on the modified intra prediction mode, and
apply an inverse non-separable transform matrix selected from the inverse non-separable transform set to a top-left region of the current block determined based on the width and height of the current block,
wherein the at least one processor is further configured to determine an index of the inverse non-separable transform set related to the modified intra prediction mode,
wherein based on that the modified intra prediction mode is greater than or equal to 0 and less than or equal to 1, the index is determined as a first index value,
wherein based on that the modified intra prediction mode is greater than or equal to 2 and less than or equal to 12, the index is determined as a second index value,
wherein based on that the modified intra prediction mode is greater than or equal to 13 and less than or equal to 23, the index is determined as a third index value,
wherein based on that the modified intra prediction mode is greater than or equal to 24 and less than or equal to 44, the index is determined as a fourth index value,
wherein based on that the modified intra prediction mode is greater than or equal to 45 and less than or equal to 55, the index is determined as the third index value,
wherein based on that the modified intra prediction mode is greater than or equal to 56, the index is determined as the second index value, and
wherein based on that the modified intra prediction mode is less than 0, the index is determined as the second index value.