US 11,683,505 B2
Method and a device for picture encoding and decoding
Saurabh Puri, Rennes (FR); Sebastien Lasserre, Thorigné Fouillard (FR); and Patrick Le Callet, Le Pallet (FR)
Assigned to INTERDIGITAL VC HOLDINGS, INC., Wilmington, DE (US)
Appl. No. 16/490,589
Filed by INTERDIGITAL VC HOLDINGS, INC., Wilmington, DE (US)
PCT Filed Feb. 21, 2018, PCT No. PCT/EP2018/054202
§ 371(c)(1), (2) Date Sep. 2, 2019,
PCT Pub. No. WO2018/158117, PCT Pub. Date Sep. 7, 2018.
Claims priority of application No. 17305227 (EP), filed on Mar. 2, 2017.
Prior Publication US 2020/0404296 A1, Dec. 24, 2020
Int. Cl. H04N 19/184 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/44 (2014.01)
CPC H04N 19/184 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/44 (2014.11)] 17 Claims
OG exemplary drawing
 
1. An encoding method comprising:
selecting a transform type of a set of a plurality of transform types for a residual block for the picture block and transforming the residual block with the selected transform type into a transformed block comprising a block of transform coefficients,
wherein the selecting comprises determining, for each transform type of the set of the plurality of transform types, a probability that the transform type was used for encoding the picture block, wherein the probability depends on the block of transform coefficients and determining a cost for encoding the picture block associated with each transform type by determining a rate for encoding the index of the transform type based on the determined probabilities;
encoding, in a bitstream, an index identifying the selected transform type based on the determined probabilities;
including the rate for encoding the index of the selected transform type in the cost; and
encoding, in the bitstream, the transformed block.