Title:
IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM AND APPARATUS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/159316
Kind Code:
A1
Abstract:
An image decoding method according to the present document comprises the steps of: receiving a quantized transform coefficient for a target block and a transform index for a non-separable secondary transform; dequantizing the quantized transform coefficients to derive transform coefficients; deriving modified transform coefficients on the basis of a matrix operation of a transform kernel matrix in a transform set indicated by the transform index and a transform coefficient list corresponding to the magnitude of dequantized transform coefficients; clipping the modified transform coefficients to a predetermined range of values; and deriving residual samples for the target block on the basis of an inverse primary transform with respect to the modified transform coefficients clipped.
Inventors:
KOO MOONMO (KR)
KIM SEUNGHWAN (KR)
LIM JAEHYUN (KR)
KIM SEUNGHWAN (KR)
LIM JAEHYUN (KR)
Application Number:
PCT/KR2020/001533
Publication Date:
August 06, 2020
Filing Date:
January 31, 2020
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/61; H04N19/11; H04N19/124; H04N19/132; H04N19/17; H04N19/593
Foreign References:
| KR20180063186A | 2018-06-11 | |||
| KR20190008203A | 2019-01-23 | |||
| KR20190003950A | 2019-01-10 | |||
| KR20180104603A | 2018-09-21 | |||
| KR20180123466A | 2018-11-16 |
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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