	US 12,206,852 B2
	Derivation of quantization matrices for joint Cb-Br coding
Edouard Francois, Bourg des Comptes (FR); Philippe De Lagrange, Betton (FR); Franck Hiron, Chateaubourg (FR); and Christophe Chevance, Brece (FR)
Assigned to InterDigital CE Patent Holdings, SAS, Paris (FR)
Appl. No. 17/766,005
Filed by INTERDIGITAL CE PATENT HOLDINGS, SAS, Paris (FR)
PCT Filed Sep. 24, 2020, PCT No. PCT/EP2020/076752 § 371(c)(1), (2) Date Apr. 1, 2022, PCT Pub. No. WO2021/063803, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 19306255 (EP), filed on Oct. 2, 2019.
Prior Publication US 2022/0368912 A1, Nov. 17, 2022
Int. Cl. H04N 19/126 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/70 (2014.01)

CPC H04N 19/126 (2014.11) [H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (2014.11)]

20 Claims

1. A method for reconstructing a block of an image, the method comprising:

determining that one single residual block is signaled for both a first chroma component of the block and a second chroma component of the block different from the first chroma component;

responsive to the determining, deriving a quantization matrix by mixing a first scaling list associated with the first chroma compenent and a second scaling list associated with the second chroma component or by mixing first and second scaling factor matrices derived from the first and second scaling lists respectively; and

applying the derived quantization matrix to the single residual block to obtain a reconstructed residual block for each of the first and second chroma components.