US 12,382,070 B2
Image decoding device, image decoding method, and program
Yoshitaka Kidani, Fujimino (JP); Kyohei Unno, Fujimino (JP); Kei Kawamura, Fujimino (JP); and Sei Naito, Fujimino (JP)
Assigned to KDDI CORPORATION, Tokyo (JP)
Appl. No. 17/615,563
Filed by KDDI CORPORATION, Tokyo (JP)
PCT Filed Jun. 11, 2020, PCT No. PCT/JP2020/022976
§ 371(c)(1), (2) Date Jun. 10, 2022,
PCT Pub. No. WO2020/262011, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-116786 (JP), filed on Jun. 24, 2019.
Prior Publication US 2023/0199206 A1, Jun. 22, 2023
Int. Cl. H04N 19/44 (2014.01); H04N 19/169 (2014.01); H04N 19/176 (2014.01); H04N 19/61 (2014.01)
CPC H04N 19/44 (2014.11) [H04N 19/176 (2014.11); H04N 19/619 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding device, wherein the image decoding device:
generates a prediction residual signal by inverse transform;
controls a method of decoding a secondary transform index of a target block according to information indicating a position where a non-zero coefficient is generated in the target block and to information indicating whether or not the target block is dual tree, and
omits decoding the secondary transform index of the target block in a case where the information indicating the position where the non-zero coefficient is generated in the target block indicates a coefficient position of a direct current component of the target block.