US 11,991,361 B2
Method and device for picture encoding and decoding using position dependent intra prediction combination
Gagan Rath, Rennes (FR); Fabien Racape, San Francisco, CA (US); and Fabrice Urban, Thorigne Fouillard (FR)
Assigned to InterDigital CE Patent Holdings, SAS, Paris (FR)
Appl. No. 17/619,047
Filed by InterDigital CE Patent Holdings, SAS, Paris (FR)
PCT Filed Jun. 15, 2020, PCT No. PCT/EP2020/066522
§ 371(c)(1), (2) Date Dec. 14, 2021,
PCT Pub. No. WO2020/254264, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 19305798 (EP), filed on Jun. 20, 2019.
Prior Publication US 2022/0303541 A1, Sep. 22, 2022
Int. Cl. H04N 19/132 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11)] 14 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a predicted value Ppred(x,y) for a sample of a block of an image, the predicted value being intra predicted according to a value representative of an intra prediction angle, wherein the intra prediction angle is a diagonal top right to bottom left direction corresponding to a first prediction mode or a diagonal bottom left to top right direction corresponding to a second prediction mode; and
determining a sample value P(x,y), such that:
for the first prediction mode: P(x,y)=Ppred(x,y)+((((Pleft−Ppred(x,y))<<log 2(wL))+32)>>6), and
for the second prediction mode: P(x,y)=Ppred(x,y)+((((Ptop−Ppred(x,y))<<log 2(wT))+32)>>6),
where, Pleft is determined based on a value of a left reference sample, Ptop is determined based on the value of a top reference sample, and wL and wT are weightings.