US 12,132,894 B2
Encoder, encoding method, decoder, and decoding method
Masato Ohkawa, Toyama (JP); Hideo Saitou, Ishikawa (JP); Tadamasa Toma, Osaka (JP); Takahiro Nishi, Nara (JP); Kiyofumi Abe, Osaka (JP); and Ryuichi Kanoh, 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. 14, 2023, as Appl. No. 18/368,140.
Application 18/368,140 is a continuation of application No. 17/350,640, filed on Jun. 17, 2021, granted, now 11,800,093.
Application 17/350,640 is a continuation of application No. 16/733,774, filed on Jan. 3, 2020, granted, now 11,076,150, issued on Jul. 27, 2021.
Application 16/733,774 is a continuation of application No. PCT/JP2018/026114, filed on Jul. 11, 2018.
Claims priority of provisional application 62/532,116, filed on Jul. 13, 2017.
Prior Publication US 2024/0007621 A1, Jan. 4, 2024
Int. Cl. H04N 19/11 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01); H04N 19/625 (2014.01)
CPC H04N 19/11 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/61 (2014.11); H04N 19/625 (2014.11)] 4 Claims
OG exemplary drawing
 
1. An encoder that encodes a current block in a picture, the encoder comprising:
circuitry; and
memory, wherein
using the memory, the circuitry:
determines whether to use intra prediction for the current block;
performs a transforming process when determining to use intra prediction for the current block; and
quantizes transform coefficients generated by the transforming process;
wherein the transforming process includes:
(i) performing a first transform on a residual signal of the current block using a first transform basis to generate first transform coefficients and performing a second transform on the first transform coefficients using a second transform basis to generate second transform coefficients, with an intra prediction mode of the current block being different from a predetermined mode and the first transform basis being same as a predetermined transform basis; and
(ii) performing a first transform on a residual signal of the current block using a first transform basis to generate first transform coefficients, with the intra prediction mode of the current block being different from the predetermined mode and the first transform basis being different from the predetermined transform basis.