US 12,081,748 B2
Encoder, decoder, encoding method, and decoding method using parameters to specify filter candidates
Han Boon Teo, Singapore (SG); Hai Wei Sun, Singapore (SG); Chong Soon Lim, Singapore (SG); Jing Ya Li, Singapore (SG); Chu Tong Wang, Singapore (SG); Kiyofumi Abe, Osaka (JP); Takahiro Nishi, Nara (JP); and Tadamasa Toma, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA, Torrance, CA (US)
Filed by Panasonic Intellectual Property Corporation of America, Torrance, CA (US)
Filed on Jul. 19, 2022, as Appl. No. 17/868,199.
Application 17/868,199 is a continuation of application No. PCT/JP2021/012414, filed on Mar. 24, 2021.
Claims priority of provisional application 63/000,835, filed on Mar. 27, 2020.
Prior Publication US 2022/0385899 A1, Dec. 1, 2022
Int. Cl. H04N 19/117 (2014.01); H04N 19/105 (2014.01); H04N 19/46 (2014.01); H04N 19/80 (2014.01)
CPC H04N 19/117 (2014.11) [H04N 19/105 (2014.11); H04N 19/46 (2014.11); H04N 19/80 (2014.11)] 13 Claims
OG exemplary drawing
 
1. An encoder comprising:
circuitry; and
memory coupled to the circuitry, wherein
in operation, the circuitry:
executes (i) a first process of applying a first filter to a first image to generate a second image, holding the second image as a reference image, and displaying the second image, and (ii) a second process of applying a second filter to the first image to generate the second image, not holding the second image as a reference image, holding the first image as a reference image, and displaying the second image;
writes coefficients of each of one or more filter candidates that are candidates for the second filter into a bitstream, the coefficients being included in a first storage location when written into the bitstream; and
writes a parameter that specifies, for each image, one of the one or more filter candidates as the second filter into the bitstream, the parameter being included in a second storage location when written into the bitstream, the second storage location being different from the first storage location.