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1. WO2020071616 - CCLM-BASED INTRA-PREDICTION METHOD AND APPARATUS THEREFOR

Publication Number WO/2020/071616
Publication Date 09.04.2020
International Application No. PCT/KR2019/007575
International Filing Date 24.06.2019
IPC
H04N 19/11 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
103Selection of coding mode or of prediction mode
11among a plurality of spatial predictive coding modes
H04N 19/105 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
103Selection of coding mode or of prediction mode
105Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
H04N 19/132 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
132Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
H04N 19/597 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
50using predictive coding
597specially adapted for multi-view video sequence encoding
H04N 19/186 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
186the unit being a colour or a chrominance component
H04N 19/176 2014.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
17the unit being an image region, e.g. an object
176the region being a block, e.g. a macroblock
CPC
H04N 19/105
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
103Selection of coding mode or of prediction mode
105Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
H04N 19/11
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
103Selection of coding mode or of prediction mode
11among a plurality of spatial predictive coding modes
H04N 19/132
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
132Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
H04N 19/176
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
17the unit being an image region, e.g. an object
176the region being a block, e.g. a macroblock
H04N 19/186
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
186the unit being a colour or a chrominance component
H04N 19/597
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
50using predictive coding
597specially adapted for multi-view video sequence encoding
Applicants
  • 엘지전자 주식회사 LG ELECTRONICS INC. [KR]/[KR]
Inventors
  • 최장원 CHOI, Jangwon
  • 허진 HEO, Jin
  • 유선미 YOO, Sunmi
  • 이령 LI, Ling
Agents
  • 인비전 특허법인 ENVISION PATENT & LAW FIRM
Priority Data
62/741,53104.10.2018US
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) CCLM-BASED INTRA-PREDICTION METHOD AND APPARATUS THEREFOR
(FR) PROCÉDÉ D'INTRAPRÉDICTION À BASE DE CCLM ET APPAREIL POUR CELA
(KO) CCLM에 기반한 인트라 예측 방법 및 그 장치
Abstract
(EN)
A picture decoding method, performed by a decoding apparatus according to the present invention, comprises the steps of: when an intra-prediction mode of a chroma block is a cross-component linear model (CCLM) mode, deriving neighboring chroma reference samples with respect to the chroma block; deriving neighboring luma reference samples of a luma block corresponding to the chroma block and luma samples in the luma block; deriving down-sampled neighboring luma reference samples and down-sampled luma samples by down sampling the neighboring luma reference samples and the luma samples, respectively; deriving a linear model parameter on the basis of the down-sampled 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 down-sampled luma samples of the luma block; and reconstructing the chroma block on the basis of the prediction samples with respect to the chroma block.
(FR)
Un procédé de décodage d'image, effectué par un appareil de décodage selon la présente invention, comprend les étapes suivantes : lorsqu'un mode d'intraprédiction d'un bloc de chrominance est un mode de modèle linéaire entre composantes (CCLM), dériver des échantillons de référence de chrominance voisins par rapport au bloc de chrominance; dériver des échantillons de référence de luminance voisins d'un bloc de luminance correspondant au bloc de chrominance et à des échantillons de luminance dans le bloc de luminance; dériver des échantillons de référence de luminance voisins sous-échantillonnés et des échantillons de luminance sous-échantillonnés en sous-échantillonnant les échantillons de référence de luminance voisins et les échantillons de luminance, respectivement; dériver un paramètre de modèle linéaire en fonction des échantillons de référence de luminance voisins sous-échantillonnés et des échantillons de référence de chrominance voisins; produire des échantillons de prédiction par rapport au bloc de chrominance en fonction du paramètre de modèle linéaire et des échantillons de luminance sous-échantillonnés du bloc de luminance; et reconstruire le bloc de chrominance en fonction des échantillons de prédiction par rapport au bloc de chrominance.
(KO)
본 발명에 따른 디코딩 장치에 의하여 수행되는 픽처 디코딩 방법은, 크로마 블록의 인트라 예측 모드가 CCLM(Cross-Component Linear Model) 모드인 경우, 상기 크로마 블록에 대한 주변 크로마 참조 샘플들을 도출하는 단계, 상기 크로마 블록에 대응되는 루마 블록의 주변 루마 참조 샘플들 및 상기 루마 블록 내의 루마 샘플들을 도출하는 단계, 상기 주변 루마 참조 샘플들 및 상기 루마 샘플들을 다운 샘플링하여 다운 샘플링된 주변 루마 참조 샘플들 및 다운 샘플링된 루마 샘플들을 도출하는 단계, 상기 다운 샘플링된 주변 루마 참조 샘플들과 상기 주변 크로마 참조 샘플들을 기반으로 선형 모델 파라미터를 도출하는 단계, 상기 선형 모델 파라미터와 상기 루마 블록의 다운 샘플링된 루마 샘플들을 기반으로 상기 크로마 블록에 대한 예측 샘플들을 생성하는 단계 및 상기 크로마 블록에 대한 상기 예측 샘플들을 기반으로 상기 크로마 블록을 복원하는 단계를 포함하는 것을 특징으로 한다.
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