US 11,997,279 B2
Affine mode signaling in video encoding and decoding
Franck Galpin, Thorigne-Fouillard (FR); Fabrice Le Leannec, Mouaze (FR); and Philippe Bordes, Laille (FR)
Assigned to InterDigital VC Holdings, Inc., Wilmington, DE (US)
Appl. No. 17/282,919
Filed by InterDigital VC Holdings, Inc., Wilmington, DE (US)
PCT Filed Oct. 9, 2019, PCT No. PCT/US2019/055468
§ 371(c)(1), (2) Date Apr. 5, 2021,
PCT Pub. No. WO2020/077003, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 18306339 (EP), filed on Oct. 10, 2018.
Prior Publication US 2021/0392329 A1, Dec. 16, 2021
Int. Cl. H04N 19/13 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/172 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/13 (2014.11) [H04N 19/105 (2014.11); H04N 19/159 (2014.11); H04N 19/172 (2014.11); H04N 19/46 (2014.11)] 21 Claims
OG exemplary drawing
 
1. A method, comprising:
deriving a CABAC context, the CABAC context being used for encoding a first flag indicating use of an affine motion model for a video block when the video block is in a first inter mode, and the same CABAC context being used for encoding a second flag indicating use of an affine motion model for the video block when the video block is in a second inter mode;
wherein the CABAC context is associated to a first CABAC probability model when the video block is in the first inter mode and the same CABAC context is associated to a second CABAC probability model when the video block is in the second inter mode, the second CABAC probability model being different from the first CABAC probability model;
the first inter mode being a mode wherein a motion vector difference with a motion predictor is coded for the video block, and the second inter mode being a mode wherein the motion vector difference is inferred to be zero for the video block; and
encoding the video block using the first flag and the first CABAC probability model during the first inter mode and using the second flag and the second CABAC probability model during the second inter mode.