US 12,413,732 B2
Encoder, decoder, and related non-transitory computer readable medium
Kiyofumi Abe, Osaka (JP); Ryuichi Kanoh, 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 Sep. 27, 2021, as Appl. No. 17/486,659.
Application 17/486,659 is a continuation of application No. 17/037,385, filed on Sep. 29, 2020, granted, now 11,166,025.
Application 17/037,385 is a continuation of application No. PCT/JP2019/013157, filed on Mar. 27, 2019.
Claims priority of provisional application 62/650,367, filed on Mar. 30, 2018.
Claims priority of provisional application 62/650,371, filed on Mar. 30, 2018.
Prior Publication US 2022/0014747 A1, Jan. 13, 2022
Int. Cl. H04N 19/126 (2014.01); H04N 19/105 (2014.01); H04N 19/119 (2014.01); H04N 19/124 (2014.01); H04N 19/176 (2014.01); H04N 19/30 (2014.01); H04N 19/94 (2014.01)
CPC H04N 19/126 (2014.11) [H04N 19/105 (2014.11); H04N 19/119 (2014.11); H04N 19/176 (2014.11); H04N 19/30 (2014.11); H04N 19/94 (2014.11); H04N 19/124 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An encoder comprising:
circuitry; and
memory coupled to the circuitry, wherein
using the memory, the circuitry, in operation:
generates a plurality of quantization matrix elements for a current block;
generates a quantization matrix using the plurality of quantization matrix elements, the quantization matrix including only a subset of quantization matrix elements of the plurality of quantization matrix elements, the subset of quantization matrix elements corresponding to a rectangular region smaller than the current block in each of a horizontal direction and a vertical direction, each of the subset of quantization matrix elements having an x-coordinate value less than or equal to a threshold x-coordinate value and a y-coordinate value less than or equal to a threshold y-coordinate value, the subset of quantization matrix elements including at least two quantization matrix elements in each of the horizontal direction and the vertical direction; and
quantizes, using the quantization matrix, transform coefficients of the current block.