US 12,143,575 B2
Intra prediction method and device
Hyun Suk Ko, Daejeon (KR); Jin Ho Lee, Daejeon (KR); Sung Chang Lim, Daejeon (KR); Jung Won Kang, Daejeon (KR); Ha Hyun Lee, Seoul (KR); Dong San Jun, Daejeon (KR); Seung Hyun Cho, Daejeon (KR); Hui Yong Kim, Daejeon (KR); and Jin Soo Choi, Daejeon (KR)
Assigned to LX Semicon Co., Ltd., (KR)
Filed by LX SEMICON CO., LTD, Daejeon (KR)
Filed on Aug. 13, 2021, as Appl. No. 17/401,578.
Application 17/401,578 is a continuation of application No. 16/099,639, granted, now 11,128,861, previously published as PCT/KR2017/006241, filed on Jun. 15, 2017.
Claims priority of application No. 10-2016-0078272 (KR), filed on Jun. 22, 2016; and application No. 10-2016-0099618 (KR), filed on Aug. 4, 2016.
Prior Publication US 2022/0030227 A1, Jan. 27, 2022
Int. Cl. H04N 19/61 (2014.01); H04L 12/16 (2006.01); H04N 19/105 (2014.01); H04N 19/11 (2014.01); H04N 19/122 (2014.01); H04N 19/124 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/184 (2014.01); H04N 19/593 (2014.01); H04N 19/625 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/11 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/184 (2014.11); H04N 19/593 (2014.11); H04N 19/96 (2014.11)] 8 Claims
OG exemplary drawing
 
1. An image decoding method performed by an image decoding apparatus, the method comprising:
obtaining, through a bitstream, image information comprising information on quantized transform coefficient levels;
deriving transform coefficients of a current block based on the information on quantized transform coefficient levels;
determining a transform set for a secondary inverse-transform based on an intra prediction mode of a current block;
determining a transform kernel for the secondary inverse-transform based on the transform set and a size of the current block;
deriving modified transform coefficients by performing the secondary inverse-transform based on the transform coefficients and the transform kernel for the secondary inverse-transform;
deriving a reconstructed residual signal by performing a primary inverse-transform based on the modified transform coefficients; and
reconstructing the current block based on the reconstructed residual signal,
wherein the secondary inverse-transform is a non-separable inverse-transform.