US 12,439,028 B2
Matrix intra prediction-based image coding apparatus and method
Jangwon Choi, Seoul (KR); Jin Heo, Seoul (KR); Sunmi Yoo, Seoul (KR); Jungah Choi, Seoul (KR); and Seunghwan Kim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Feb. 22, 2022, as Appl. No. 17/677,603.
Application 17/677,603 is a continuation of application No. PCT/KR2020/011235, filed on Aug. 24, 2020.
Claims priority of provisional application 62/890,585, filed on Aug. 22, 2019.
Prior Publication US 2022/0182639 A1, Jun. 9, 2022
Int. Cl. H04N 19/105 (2014.01); H04N 19/103 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/103 (2014.11); H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/70 (2014.11)] 7 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including prediction mode information from a bitstream;
obtaining matrix-based intra prediction (MIP) flag information indicating whether an MIP is applied to a current block based on the prediction mode information;
deriving an MIP mode for the current block based on the MIP flag information;
deriving an MIP matrix for the current block based on the MIP mode;
generating MIP samples for the current block based on the MIP matrix; and
deriving reconstructed samples for the current block based on the MIP samples,
wherein for the current block whose size is 64×4 in which a ratio of a width and a height of the current block is larger than four, the MIP flag information indicating whether the MIP is applied to the current block is obtained from the bitstream,
wherein the MIP matrix is derived further based on the width and the height of the current block,
wherein the MIP matrix is derived based on three matrix sets including a first matrix set, a second matrix set, and a third matrix set, and
wherein a number of matrixes of the first matrix set is different from a number of matrixes of the second matrix set, the number of matrixes of the first matrix set is different from a number of matrixes of the third matrix set, and the number of matrixes of the second matrix set is different from the number of matrixes of the third matrix set.