US 12,081,785 B2
Video decoding method using residual information in video coding system, and apparatus thereof
Sunmi Yoo, Seoul (KR); Jungah Choi, Seoul (KR); and Seunghwan Kim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Aug. 19, 2022, as Appl. No. 17/891,425.
Application 17/891,425 is a continuation of application No. 17/400,718, filed on Aug. 12, 2021, granted, now 11,463,719.
Application 17/400,718 is a continuation of application No. PCT/KR2020/002402, filed on Feb. 19, 2020.
Claims priority of provisional application 62/807,745, filed on Feb. 19, 2019.
Prior Publication US 2022/0400277 A1, Dec. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/46 (2014.01); H04N 19/103 (2014.01); H04N 19/136 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/46 (2014.11) [H04N 19/103 (2014.11); H04N 19/136 (2014.11); H04N 19/176 (2014.11)] 17 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the image decoding method comprising:
obtaining image information including a transform skip flag and residual information for a current block, wherein the transform skip flag represents whether the current block is a transform skip block;
determining whether the current block is the transform skip block based on the transform skip flag;
based on the current block being the transform skip block, deriving a context model for a sign flag of a current residual coefficient in a current sub-block of the current block based on a sign flag of a residual coefficient decoded prior to the current residual coefficient in the current sub-block;
decoding the sign flag based on the context model;
deriving the current residual coefficient based on the sign flag;
deriving a residual sample based on the current residual coefficient; and
generating a reconstructed picture based on the residual sample.