	US 12,231,687 B2
	Karhunen loeve transform for video coding
Karam Naser, Cesson-Sevigne (FR); Fabrice Le Leannec, Betton (FR); Franck Galpin, Cesson-Sevigne (FR); and Thierry Dumas, Cesson-Sevigne (FR)
Assigned to InterDigital CE Patent Holdings, SAS, Paris (FR)
Appl. No. 18/021,794
Filed by InterDigital CE Patent Holdings, SAS, Paris (FR)
PCT Filed Sep. 23, 2021, PCT No. PCT/EP2021/076155 § 371(c)(1), (2) Date Feb. 16, 2023, PCT Pub. No. WO2022/069331, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 20306120 (EP), filed on Sep. 29, 2020.
Prior Publication US 2024/0031606 A1, Jan. 25, 2024
Int. Cl. H04N 19/61 (2014.01); H04N 19/176 (2014.01); H04N 19/625 (2014.01)

CPC H04N 19/61 (2014.11) [H04N 19/176 (2014.11); H04N 19/625 (2014.11)]

20 Claims

1. A method for video encoding, comprising:

obtaining a prediction block and a residual block for a current block;

obtaining a plurality of residual blocks, based on a plurality of respective neighboring blocks and said prediction block for said current block;

applying a primary transform to said plurality of residual blocks to obtain a plurality of respective transformed residual blocks;

obtaining a Karhunen Loeve Transform (KLT) transform matrix based on said plurality of transformed residual blocks;

applying said primary transform to said residual block for said current block, to obtain a current transformed residual block; and

applying said KLT transform matrix as secondary transform to said current transformed residual block.