US 12,348,717 B2
Encoder that performs calculation from which a plurality of discrete integers are yieldable as a calculation result to derive one of the plurality of discrete integers as a quantization parameter threshold
Jing Ya Li, Singapore (SG); Chong Soon Lim, Singapore (SG); Han Boon Teo, Singapore (SG); Che Wei Kuo, Singapore (SG); Hai Wei Sun, 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 Aug. 16, 2022, as Appl. No. 17/888,715.
Application 17/888,715 is a continuation of application No. PCT/JP2021/009139, filed on Mar. 9, 2021.
Claims priority of provisional application 62/988,488, filed on Mar. 12, 2020.
Prior Publication US 2022/0394264 A1, Dec. 8, 2022
Int. Cl. H04N 19/124 (2014.01); H04N 19/169 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/176 (2014.11); H04N 19/188 (2014.11)] 5 Claims
OG exemplary drawing
 
1. An encoder comprising:
circuitry; and
memory coupled to the circuitry, wherein
in operation, the circuitry:
performs calculation that involves multiplication and from which a plurality of discrete integers are yieldable as a calculation result, to derive one of the plurality of discrete integers as a quantization parameter threshold; and
when orthogonal transform is skipped for a current block of an image, determines a quantization parameter value for the current block, using the quantization parameter threshold,
the calculation involves multiplying a first value by a first fixed value, the first value and the first fixed value being each an integer,
the first value is a limit value to be included in a header of a bitstream, and
the first fixed value is 6.