US 12,452,454 B2
Entropy coding method and device in video/image coding system
Jungah Choi, Seoul (KR); Jin Heo, Seoul (KR); Sunmi Yoo, Seoul (KR); Jaehyun Lim, Seoul (KR); Jangwon Choi, Seoul (KR); and Seunghwan Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/767,388
Filed by LG ELECTRONICS INC., Yeongdeungpo-gu Seoul (KR)
PCT Filed Oct. 6, 2020, PCT No. PCT/KR2020/013528
§ 371(c)(1), (2) Date Apr. 7, 2022,
PCT Pub. No. WO2021/071188, PCT Pub. Date Apr. 15, 2021.
Claims priority of provisional application 62/911,978, filed on Oct. 7, 2019.
Prior Publication US 2024/0080480 A1, Mar. 7, 2024
Int. Cl. H04N 19/18 (2014.01); H04N 19/176 (2014.01); H04N 19/60 (2014.01); H04N 19/70 (2014.01); H04N 19/91 (2014.01)
CPC H04N 19/60 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/70 (2014.11); H04N 19/91 (2014.11)] 12 Claims
OG exemplary drawing
 
1. A video decoding method performed by a decoding apparatus, the method comprising:
obtaining information indicating a level value of a transform coefficient in a current block from a bitstream;
deriving a rice parameter for the information indicating the level value of the transform coefficient based on whether a maximum number of context coded bins available for the transform coefficient is larger than or equal to a threshold value;
deriving a bin string for the information indicating the level value of the transform coefficient based on the rice parameter; and
deriving the level value of the transform coefficient based on the bin string,
wherein the deriving of the rice parameter comprises deriving a first rice parameter based on the maximum number of available context coded bins being larger than or equal to the threshold value and deriving a second rice parameter based on the maximum number of available context coded bins being less than the threshold value,
wherein a value of the first rice parameter is smaller than a value of the second rice parameter, and
wherein the second rice parameter is derived based on the first rice parameter and a preset offset.