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Patent Searching and Data


Title:
IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/060827
Kind Code:
A1
Abstract:
An image decoding method according to the present document comprises the steps of: when an ISP is applied to a current block and the width or height of a sub-partition block is less than or equal to 2, applying LFNST to the transform coefficients to derive modified transform coefficients; deriving residual samples for the objective 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 for the objective block, wherein when the sub-partition block is an N X 2 block or a 2 X N block, (M X 2) or (2 X M) number of modified transform coefficients are derived by applying an LFNST matrix to a predetermined number of transform coefficients in an upper left M X 2 area or 2 X M (M ≤ N) area of the sub-partition block.

Inventors:
KOO MOONMO (KR)
LIM JAEHYUN (KR)
KIM SEUNGHWAN (KR)
Application Number:
PCT/KR2020/012859
Publication Date:
April 01, 2021
Filing Date:
September 23, 2020
Export Citation:
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Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/61; H04N19/11; H04N19/119; H04N19/122; H04N19/132; H04N19/137; H04N19/176; H04N19/18; H04N19/597
Foreign References:
KR20190090866A2019-08-02
KR20180063186A2018-06-11
KR101997604B12019-07-08
KR20190052008A2019-05-15
Other References:
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 ), 3 July 2019 (2019-07-03), XP030218858
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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