Title:
TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE FOR SAME
Document Type and Number:
WIPO Patent Application WO/2021/137556
Kind Code:
A1
Abstract:
An image decoding method according to the present document comprises the steps of: receiving residual information in a bitstream, wherein the residual information includes a transform skip flag for each individual component of the current block; deriving corrected transform coefficients, wherein the step for deriving includes a step for setting a variable indicating whether effective coefficients exist at positions other than that of a DC component of the current block to 0 when even one of the values of the transform skip flags for the individual components is 0, and a step for parsing an LFNST index on the basis of the variable being 0; and deriving an LFNST kernel for applying LFNST on the basis of the LFNST index, wherein the variable being 0 may indicate that effective coefficients exist at positions other than that of the DC component.
Inventors:
KOO MOONMO (KR)
KIM SEUNGHWAN (KR)
SALEHIFAR MEHDI (KR)
LIM JAEHYUN (KR)
KIM SEUNGHWAN (KR)
SALEHIFAR MEHDI (KR)
LIM JAEHYUN (KR)
Application Number:
PCT/KR2020/019216
Publication Date:
July 08, 2021
Filing Date:
December 28, 2020
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/60; H04N19/132; H04N19/176; H04N19/186; H04N19/70
Foreign References:
| KR20170068466A | 2017-06-19 | |||
| US20180103260A1 | 2018-04-12 |
Other References:
B. BROSS, J. CHEN, S. LIU: "Versatile Video Coding (Draft 5)", 14. JVET MEETING; 20190319 - 20190327; GENEVA; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-N1001, 2 July 2019 (2019-07-02), pages 1 - 406, XP030220731
M. SIEKMANN (FRAUNHOFER), H. SCHWARZ (FRAUNHOFER), D. MARPE (FRAUNHOFER), T. WIEGAND (HHI): "CE6-2.1: Simplification of Low Frequency Non-Separable Transform", 15. JVET MEETING; 20190703 - 20190712; GOTHENBURG; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-O0094 ; m48185, 1 July 2019 (2019-07-01), XP030218614
M. KOO (LGE), J. NAM (LGE), J. LIM (LGE), M. SALEHIFAR (LGE), S. KIM (LGE): "Non-CE6: LFNST simplification based on the methods proposed in CE6-2.1a", 15. JVET MEETING; 20190703 - 20190712; GOTHENBURG; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-O0209 ; m48318, 5 July 2019 (2019-07-05), XP030218860
M. SIEKMANN (FRAUNHOFER), H. SCHWARZ (FRAUNHOFER), D. MARPE (FRAUNHOFER), T. WIEGAND (HHI): "CE6-2.1: Simplification of Low Frequency Non-Separable Transform", 15. JVET MEETING; 20190703 - 20190712; GOTHENBURG; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-O0094 ; m48185, 1 July 2019 (2019-07-01), XP030218614
M. KOO (LGE), J. NAM (LGE), J. LIM (LGE), M. SALEHIFAR (LGE), S. KIM (LGE): "Non-CE6: LFNST simplification based on the methods proposed in CE6-2.1a", 15. JVET MEETING; 20190703 - 20190712; GOTHENBURG; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-O0209 ; m48318, 5 July 2019 (2019-07-05), XP030218860
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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