Title:
IMAGE CODING METHOD BASED ON QUADRATIC TRANSFORM, AND APPARATUS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/171671
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 non-separable quadratic transform; deriving transform coefficients by inversely quantizing the quantized transform coefficient; deriving corrected transform coefficients on the basis of a transform kernel matrix in a predetermined transform set indicated by the transform index; and deriving residual samples for the target block on the basis of inverse linear transform for the corrected transform coefficients, wherein when the target block is divided into a predetermined number of sub-blocks and is coded by intra prediction, the corrected transform coefficients are derived in units of the sub-blocks, and the transform index is received for the target block.
Inventors:
KOO MOONMO (KR)
LIM JAEHYUN (KR)
KIM SEUNGHWAN (KR)
LIM JAEHYUN (KR)
KIM SEUNGHWAN (KR)
Application Number:
PCT/KR2020/002625
Publication Date:
August 27, 2020
Filing Date:
February 24, 2020
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/61; H04N19/11; H04N19/117; H04N19/124; H04N19/17; H04N19/176; H04N19/593; H04N19/625; H04N19/70
Domestic Patent References:
| WO2018174402A1 | 2018-09-27 | |||
| WO2018236133A1 | 2018-12-27 | |||
| WO2018047669A1 | 2018-03-15 | |||
| WO2018166429A1 | 2018-09-20 |
Foreign References:
| US20180302631A1 | 2018-10-18 |
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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