Title:
CCLM PREDICTION-BASED IMAGE DECODING METHOD AND APPARATUS IN IMAGE CODING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/171644
Kind Code:
A1
Abstract:
An image decoding method executed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction mode of the current chroma block by means of cross-component linear model (CCLM) mode; deriving downsampled luma samples on the basis of the current luma block; deriving downsampled neighboring luma samples on the basis of neighboring luma samples of the current luma block; and deriving the CCLM parameter on the basis of the downsampled neighboring luma samples and neighboring chroma samples of the current neighboring chroma block, wherein the number of downsampled neighboring luma samples and number of neighboring chroma samples are equal to the previously set thresh-hold value, and the thresh-hold value is derived on the basis of the width and height of the current chroma block.
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Inventors:
CHOI JANGWON (KR)
HEO JIN (KR)
KIM SEUNGHWAN (KR)
YOO SUNMI (KR)
CHOI JUNGAH (KR)
LI LING (KR)
HEO JIN (KR)
KIM SEUNGHWAN (KR)
YOO SUNMI (KR)
CHOI JUNGAH (KR)
LI LING (KR)
Application Number:
PCT/KR2020/002532
Publication Date:
August 27, 2020
Filing Date:
February 21, 2020
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/11; H04N19/132; H04N19/186; H04N19/593
Domestic Patent References:
| WO2018132710A1 | 2018-07-19 | |||
| WO2018140587A1 | 2018-08-02 | |||
| WO2017164297A1 | 2017-09-28 |
Foreign References:
| JP2018056685A | 2018-04-05 | |||
| KR20190008224A | 2019-01-23 |
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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