TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR

Title:

TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR

Document Type and Number:

WIPO Patent Application WO/2020/197274

Kind Code:

A1

Abstract:

An image decoding method according to the present document comprises a step for performing inverse first-order transform and inverse non-separable transform on a residual sample. The inverse non-separable transform is performed on the basis of a transform index indicating a predetermined transform kernel matrix, the inverse first-order transform is performed on the basis of a multiple transform selection (MTS) index indicating MTS for a horizontal transform kernel and a vertical transform kernel, and a syntax element bin string for the transform index is derived on the basis of first context information when a tree type for a split structure of a target block is not a single tree type and is derived on the basis of second context information when the tree type is the single tree type.

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Inventors:

KOO MOONMO (KR)
LIM JAEHYUN (KR)
NAM JUNGHAK (KR)
KIM SEUNGHWAN (KR)

Application Number:

PCT/KR2020/004090

Publication Date:

October 01, 2020

Filing Date:

March 26, 2020

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Assignee:

LG ELECTRONICS INC (KR)

International Classes:

H04N19/61; H04N19/11; H04N19/132; H04N19/593; H04N19/70

Foreign References:

US20190007705A1	2019-01-03
US20170238013A1	2017-08-17
KR20120060914A	2012-06-12

Other References:

KOO, OONMO ET AL.: "CE6: Reduced Secondary Transform (RST) (CE6-3.1). JVET-N0193-v3. Spec text CE6-3.1", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11. 14TH MEETING, 16 March 2019 (2019-03-16), Geneva, CH ., pages 1 - 30, XP030256928
TSUKUBA, TAKESHI ET AL.: "Non-CE6: MTS Simplification. JVET-N0121-v3", JOINT VIDEO EXPERTS TEAM (JVET) OFITU-T SG 16 WP 3 AND ISO/TEC JTC 1/SC 29/WG 11. 14TH MEETING, 22 March 2019 (2019-03-22), Geneva, CH ., pages 1 - 14, XP030209295
See also references of EP 3937501A4

Attorney, Agent or Firm:

ENVISION PATENT & LAW FIRM (KR)

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