US 11,716,473 B2
Encoder, decoder, encoding method, and decoding method
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 Aug. 11, 2022, as Appl. No. 17/886,275.
Application 17/886,275 is a continuation of application No. 17/885,425, filed on Aug. 10, 2022.
Application 17/885,425 is a continuation of application No. 17/884,420, filed on Aug. 9, 2022.
Application 17/884,420 is a continuation of application No. 17/883,445, filed on Aug. 8, 2022, granted, now 11,595,654.
Application 17/883,445 is a continuation of application No. 17/034,825, filed on Sep. 28, 2020, granted, now 11,457,215.
Application 17/034,825 is a continuation of application No. PCT/JP2019/013154, filed on Mar. 27, 2019.
Claims priority of provisional application 62/650,458, filed on Mar. 30, 2018.
Prior Publication US 2022/0394268 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/126 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/60 (2014.01); H04N 19/30 (2014.01); H04N 19/124 (2014.01)
CPC H04N 19/126 (2014.11) [H04N 19/124 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/30 (2014.11); H04N 19/60 (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:
writes, into a bitstream, information related to a first quantization matrix;
performs an up-conversion and a down-conversion on the first quantization matrix to generate a second quantization matrix, the first quantization matrix having a first number of rows and a first number of columns equal to the first number of rows to form a square matrix, the second quantization matrix having a second number of rows and a second number of columns different from the second number of rows to form a rectangular matrix;
quantizes transform coefficients of a current block using the second quantization matrix; and
encodes the quantized transform coefficients of the current block, wherein
the up-conversion is performed on the first quantization matrix in a first direction such that one of the second number of rows and the second number of columns is larger than the first number of rows, without up-conversion being performed on the first quantization matrix in a second direction that is different from the first direction, the first direction being a horizontal direction and the second direction being a vertical direction; and
the down-conversion is performed on the first quantization matrix in the second direction such that the other of the second number of rows and the second number of columns is smaller than the first number of rows, without down-conversion being performed on the first quantization matrix in the first direction.