US 12,301,808 B2
Image decoding device, image decoding method, and program
Kyohei Unno, Saitama (JP); Kei Kawamura, Saitama (JP); and Sei Naito, Saitama (JP)
Assigned to KDDI CORPORATION, Tokyo (JP)
Filed by KDDI CORPORATION, Tokyo (JP)
Filed on Feb. 17, 2022, as Appl. No. 17/674,761.
Application 17/674,761 is a continuation of application No. PCT/JP2020/045160, filed on Dec. 4, 2020.
Claims priority of application No. 2019-237289 (JP), filed on Dec. 26, 2019.
Prior Publication US 2022/0174283 A1, Jun. 2, 2022
Int. Cl. H04N 19/124 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/132 (2014.11); H04N 19/176 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding device comprising a circuit, wherein
the circuit:
corrects a value of a quantization parameter of a target block in accordance with whether or not an adaptive color transform has been applied to the target block;
sets the collected value of the quantization parameter of the target block to be equal to or more than a minimum value of the quantization parameter at a time of applying a transform skip mode, in a case where a transform skip mode has been applied to the target block;
sets the minimum value of the quantization parameter to “4”; and
sets a quantization step width of “1” when the transform skip mode is applied to the target block.