US 12,407,841 B2
Method and device for adaptive selection of rice parameter for binarizing residual coefficient in video signal encoding/decoding
Sung Won Lim, Gyeonggi-do (KR)
Assigned to KT CORPORATION, Gyeonggi-do (KR)
Appl. No. 18/278,717
Filed by KT CORPORATION, Gyeonggi-do (KR)
PCT Filed Feb. 25, 2022, PCT No. PCT/KR2022/002810
§ 371(c)(1), (2) Date Aug. 24, 2023,
PCT Pub. No. WO2022/182208, PCT Pub. Date Sep. 1, 2022.
Claims priority of application No. 10-2021-0025449 (KR), filed on Feb. 25, 2021.
Prior Publication US 2024/0137535 A1, Apr. 25, 2024
Prior Publication US 2024/0236340 A9, Jul. 11, 2024
Int. Cl. H04N 19/196 (2014.01); H04N 19/12 (2014.01); H04N 19/176 (2014.01); H04N 19/463 (2014.01); H04N 19/60 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/196 (2014.11) [H04N 19/12 (2014.11); H04N 19/176 (2014.11); H04N 19/463 (2014.11); H04N 19/60 (2014.11); H04N 19/70 (2014.11)] 13 Claims
OG exemplary drawing
 
1. A method of decoding an image, the method comprising:
determining whether an inverse transform is skipped for a current block;
decoding, based on a rice parameter, information on a residual coefficient of the current block;
reconstructing the residual coefficient based on the information; and
obtaining a residual sample of the current block from the residual coefficient,
wherein the rice parameter for the residual coefficient is obtained by:
deriving an initial sum of absolute value variable based on a sum of absolute values of reference residual coefficients;
obtaining a shifting parameter based on the initial sum of absolute value variable;
obtaining a sum of absolute value variable by updating the initial sum of absolute value variable based on the shifting parameter;
obtaining, based on the sum of absolute value variable, an initial rice parameter from a rice parameter mapping table; and
obtaining the rice parameter by updating the initial rice parameter based on the shifting parameter,
wherein the shifting parameter is one of a plurality of shifting parameter candidates, and
wherein a selection of the one from the plurality of shifting parameter is based on an interval to which the initial sum of absolute value variable belongs among a plurality of intervals.