Title:
METHOD AND DEVICE FOR IMAGE CODING BASED ON CONTEXT-CODED RESIDUAL INFORMATION
Document Type and Number:
WIPO Patent Application WO/2020/189991
Kind Code:
A1
Abstract:
An image decoding method according to the present document comprises the steps of: obtaining residual information for a current block; deriving transform coefficients for the current block on the basis of the residual information; deriving residual samples on the basis of the transform coefficients; and generating reconstruction samples on the basis of the residual samples, wherein the step of deriving transform coefficients comprises the steps of: deriving a context model for the sign flag of a current transform coefficient in the current block; decoding the value of the sign flag of the current transform coefficient on the basis of the context model; and deriving the current transform coefficient on the basis of the value of the sign flag of the current transform coefficient, wherein the context model for the sign flag of the current transform coefficient is derived on the basis of the sign flags of the previous transform coefficients.
Inventors:
YOO SUNMI (KR)
HEO JIN (KR)
CHOI JANGWON (KR)
CHOI JUNGAH (KR)
KIM SEUNGHWAN (KR)
HEO JIN (KR)
CHOI JANGWON (KR)
CHOI JUNGAH (KR)
KIM SEUNGHWAN (KR)
Application Number:
PCT/KR2020/003578
Publication Date:
September 24, 2020
Filing Date:
March 16, 2020
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/13; H04N19/137; H04N19/176; H04N19/18; H04N19/70
Foreign References:
| US20170142448A1 | 2017-05-18 | |||
| US20150103917A1 | 2015-04-16 | |||
| KR20170025538A | 2017-03-08 |
Other References:
MARTA KARCZEWICZ: "CE8-related: Sign context modelling and level mapping for TS residual coding", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 14TH MEETING, no. JVET-N0455, 13 March 2019 (2019-03-13), Geneva, CH, pages 1 - 8, XP030203098
SUNMI YOO: "CE8-4.2 : Residual Coding for Transform Skip, with various maximum context coded bins", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 14TH MEETING, no. JVET-N0429, 13 March 2019 (2019-03-13), Geneva, CH, pages 1 - 4, XP030205529
SUNMI YOO: "CE8-4.2 : Residual Coding for Transform Skip, with various maximum context coded bins", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 14TH MEETING, no. JVET-N0429, 13 March 2019 (2019-03-13), Geneva, CH, pages 1 - 4, XP030205529
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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