US 12,439,079 B2
Image decoding device, image decoding method, and program
Kyohei Unno, Fujimino (JP); Kei Kawamura, Fujimino (JP); and Sei Naito, Fujimino (JP)
Assigned to KDDI CORPORATION, Tokyo (JP)
Filed by KDDI CORPORATION, Tokyo (JP)
Filed on Apr. 25, 2024, as Appl. No. 18/646,616.
Application 18/646,616 is a continuation of application No. 17/674,347, filed on Feb. 17, 2022, granted, now 12,010,339.
Application 17/674,347 is a continuation of application No. PCT/JP2020/031563, filed on Aug. 21, 2020.
Claims priority of application No. 2019-172133 (JP), filed on Sep. 20, 2019.
Prior Publication US 2024/0283972 A1, Aug. 22, 2024
Int. Cl. H04N 19/577 (2014.01); H04N 19/137 (2014.01); H04N 19/176 (2014.01); H04N 19/64 (2014.01); H04N 19/513 (2014.01)
CPC H04N 19/577 (2014.11) [H04N 19/137 (2014.11); H04N 19/176 (2014.11); H04N 19/64 (2014.11); H04N 19/513 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding device comprising:
a memory storing instructions; and
one or more processors configured to:
determine whether or not an application condition of BDOF (Bi-Directional Optical Flow) processing is satisfied for each block based on:
a first time distance between a target frame and a first reference frame of two reference frames being equal to a second time distance between the target frame and a second reference frame of the two reference frames, and
a first weight coefficient of the first reference frame and a second weight coefficient of the second reference frame;
divide each block into sub-blocks; and
if it is determined that the application condition of BDOF processing is satisfied, perform the BDOF processing to generate a prediction signal for each of the sub-blocks.