US 11,722,704 B2
Decoding an image
Pierre Andrivon, Liffre (FR); Marie-Jean Colaitis, Cesson-Sévigné (FR); and David Touze, Rennes (FR)
Assigned to InterDigital VC Holdings, Inc., Wilmington, DE (US)
Appl. No. 17/415,959
Filed by InterDigital VC Holdings, Inc., Wilmington, DE (US)
PCT Filed Dec. 17, 2019, PCT No. PCT/US2019/066927
§ 371(c)(1), (2) Date Jun. 18, 2021,
PCT Pub. No. WO2020/131920, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18306786 (EP), filed on Dec. 21, 2018.
Prior Publication US 2022/0086507 A1, Mar. 17, 2022
Int. Cl. H04N 19/98 (2014.01); H04N 19/85 (2014.01)
CPC H04N 19/98 (2014.11) [H04N 19/85 (2014.11)] 11 Claims
OG exemplary drawing
 
1. A method for decoding an image comprising:
obtaining parameters of an inverse tone mapping function, and
decoding the image wherein the decoding comprises at least applying the inverse tone mapping function to the image based on obtained parameters, the inverse tone mapping function comprising at least a lower linear section defined by a steepness value,
wherein when a first value representative of a maximal average luminance parameter of a display device that will display the image is smaller than a second value representative of an average luminance of the image to be displayed, the inverse tone mapping parameters are adjusted by scaling the steepness value based on a ratio between the first value and a weighted value of the second value and wherein the weight is in the range of 0.5 to 2.