Title:
CCLM-BASED INTRA-PREDICTION METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/009357
Kind Code:
A1
Abstract:
A picture decoding method performed by means of a decoding device according to the present invention comprises the steps of: deriving neighboring luma reference samples of a luma block; deriving neighboring chroma reference samples with respect to a chroma block if the intra-prediction mode of the chroma block corresponding to the luma block is a cross-component linear model (CCLM) mode; deriving downsampled neighboring luma reference samples by downsampling the neighboring luma reference samples; deriving a linear model parameter on the basis of the downsampled neighboring luma reference samples and the neighboring chroma reference samples; generating prediction samples with respect to the chroma block on the basis of the linear model parameter and the downsampled neighboring luma samples of the luma block; and restoring the chroma block on the basis of the prediction samples with respect to the chroma block, wherein the neighboring luma reference samples comprise upper neighboring luma reference samples positioned above the top-side boundary of the luma block and left neighboring luma reference samples positioned on the left side of the left-side boundary of the luma block, and, if the top-side boundary of the luma block overlaps the boundary of a coding tree unit (CTU), the number of the upper neighboring luma reference samples used for deriving the downsampled neighboring luma reference samples among the neighboring luma reference samples is smaller than the number of the left neighboring luma reference samples used for deriving the downsampled neighboring luma reference samples.
Inventors:
CHOI JANGWON (KR)
HEO JIN (KR)
YOO SUNMI (KR)
LI LING (KR)
HEO JIN (KR)
YOO SUNMI (KR)
LI LING (KR)
Application Number:
PCT/KR2019/007582
Publication Date:
January 09, 2020
Filing Date:
June 24, 2019
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/105; H04N19/186; H04N19/42; H04N19/593
Foreign References:
| KR20170129750A | 2017-11-27 | |||
| US20140086502A1 | 2014-03-27 | |||
| KR101708985B1 | 2017-02-21 | |||
| KR101539312B1 | 2015-07-24 | |||
| KR20140029525A | 2014-03-10 |
Other References:
See also references of EP 3799428A4
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
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