US 12,069,315 B2
Film grain process
Rickard Sjöberg, Stockholm (SE); Mitra Damghanian, Upplands-Bro (SE); Martin Pettersson, Vallentuna (SE); and Davood Saffar, Solna (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/786,059
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Dec. 11, 2020, PCT No. PCT/EP2020/085743
§ 371(c)(1), (2) Date Jun. 16, 2022,
PCT Pub. No. WO2021/122367, PCT Pub. Date Jun. 24, 2021.
Claims priority of provisional application 62/950,554, filed on Dec. 19, 2019.
Prior Publication US 2023/0016432 A1, Jan. 19, 2023
Int. Cl. H04N 19/85 (2014.01); H04N 19/172 (2014.01); H04N 19/174 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/85 (2014.11) [H04N 19/172 (2014.11); H04N 19/174 (2014.11); H04N 19/70 (2014.11)] 13 Claims
OG exemplary drawing
 
1. A method performed by a decoder for decoding encoded pictures, the method comprising:
obtaining a film grain model syntax element from an adaptation parameter set, APS, in a coded data representation;
determining a film grain model value by decoding the film grain model syntax element;
obtaining a seed syntax element from a picture header or a slice header of the coded data representation;
determining a seed value by decoding the seed syntax element;
decoding a current picture from the coded data representation;
generating film grain from a number generator based on the seed value;
generating an output picture by applying the generated film grain to the current picture; and
outputting the output picture,
wherein the APS comprises an APS set identifier syntax element and an APS type syntax element comprising a value equal to a film grain type value, and
wherein the picture header or slice header comprises a film grain parameter set identifier syntax element comprising a value equal to the value of the APS set identifier syntax element.