	US 12,238,304 B2
	Chroma residual scaling foreseeing a corrective value to be added to luma mapping slope values
Edouard Francois, Bourg des Comptes (FR); Franck Galpin, Thorigne-Fouillard (FR); Karam Naser, Mouazé (FR); and Philippe De Lagrange, Betton (FR)
Assigned to InterDigital Madison Patent Holdings, SAS, Paris (FR)
Appl. No. 17/760,702
Filed by INTERDIGITAL MADISON PATENT HOLDINGS, SAS, Paris (FR)
PCT Filed Sep. 16, 2020, PCT No. PCT/EP2020/075841 § 371(c)(1), (2) Date Mar. 15, 2022, PCT Pub. No. WO2021/053002, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 19306117 (EP), filed on Sep. 17, 2019; application No. 19306170 (EP), filed on Sep. 23, 2019; application No. 19306288 (EP), filed on Oct. 4, 2019; application No. 19306324 (EP), filed on Oct. 10, 2019; and application No. 19306325 (EP), filed on Oct. 10, 2019.
Prior Publication US 2022/0329829 A1, Oct. 13, 2022
Int. Cl. H04N 19/186 (2014.01); H04N 19/65 (2014.01); H04N 19/82 (2014.01); H04N 19/36 (2014.01)

CPC H04N 19/186 (2014.11) [H04N 19/65 (2014.11); H04N 19/82 (2014.11); H04N 19/36 (2014.11)]

21 Claims

1. A method comprising:

determining one or more chroma residual scaling parameters based on one or more luma mapping parameters and based on a corrective value of the one or more chroma residual scaling parameters, wherein the one or more luma mapping parameters are representative of a slope of a luma forward mapping function applied to a prediction of luma samples, and wherein the corrective value of the one or more chroma residual scaling parameters is an additive value to be added to the one or more luma mapping parameters to modify the slope of the luma forward mapping function; and

encoding the video based on the determined one or more chroma residual scaling parameters.