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Title:
IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/086149
Kind Code:
A1
Abstract:
An image decoding method according to the present document comprises the steps of: applying LFNST to transform coefficients to derive modified transform coefficients; deriving residual samples for a target block on the basis of an inverse primary transform for the modified transform coefficients; and generating a reconstructed picture on the basis of the residual samples, wherein the step of deriving the modified transform coefficients can comprise the steps of parsing an LFNST index on the basis of the current block tree type being a dual tree chroma, and deriving the modified transform coefficients on the basis of the LFNST index and an LFNST matrix.

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Inventors:
KOO MOONMO (KR)
KIM SEUNGHWAN (KR)
LIM JAEHYUN (KR)
Application Number:
PCT/KR2020/015135
Publication Date:
May 06, 2021
Filing Date:
November 02, 2020
Export Citation:
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Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/61; H04N19/12; H04N19/132; H04N19/18; H04N19/186; H04N19/70
Foreign References:
KR20170138072A2017-12-14
KR20190104032A2019-09-05
KR20180123466A2018-11-16
Other References:
BENJAMIN BROSS , JIANLE CHEN , SHAN LIU , YE-KUI WANG: "Versatile Video Coding (Draft 7)", 16. JVET MEETING; 20191001 - 20191011; GENEVA; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-P2001-vB, 31 October 2019 (2019-10-31), Geneva, CH, pages 1 - 488, XP030224327
JANI LAINEMA: "CE6-related: Latency reduction for LFNST signalling", 16. JVET MEETING; 20191001 - 20191011; GENEVA; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-P0196, 24 September 2019 (2019-09-24), Geneva CH, pages 1 - 3, XP030216572
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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