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1. (WO2017061671) METHOD AND DEVICE FOR CODING IMAGE ON BASIS OF ADAPTIVE TRANSFORMATION IN IMAGE CODING SYSTEM
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2017/061671 International Application No.: PCT/KR2016/000745
Publication Date: 13.04.2017 International Filing Date: 22.01.2016
IPC:
H04N 19/103 (2014.01) ,H04N 19/18 (2014.01) ,H04N 19/159 (2014.01)
[IPC code unknown for H04N 19/103][IPC code unknown for H04N 19/18][IPC code unknown for H04N 19/159]
Applicants:
엘지전자 주식회사 LG ELECTRONICS INC. [KR/KR]; 서울시 영등포구 여의대로 128 128, Yeoui-daero,Yeongdeungpo-gu Seoul 07336, KR
Inventors:
김규운 KIM, Kyuwoon; KR
이범식 LEE, Bumshik; KR
Agent:
인비전 특허법인 ENVISION PATENT& LAW FIRM; 서울시 강남구 테헤란로 14길 5 (역삼동 삼흥역삼빌딩 2층) (2F. Samheung Yeoksam Bldg., Yeoksam-dong) 5 Teheran-ro 14-gil Gangnam-gu Seoul 06235, KR
Priority Data:
62/238,71308.10.2015US
Title (EN) METHOD AND DEVICE FOR CODING IMAGE ON BASIS OF ADAPTIVE TRANSFORMATION IN IMAGE CODING SYSTEM
(FR) PROCÉDÉ ET DISPOSITIF DE CODAGE D'IMAGE BASÉ SUR UNE TRANSFORMATION ADAPTATIVE DANS UN SYSTÈME DE CODAGE D'IMAGE
(KO) 영상 코딩 시스템에서 적응적 변환에 기반한 영상 코딩 방법 및 장치
Abstract:
(EN) According to the present invention, a method for decoding an image, performed by a decoding device, comprises the steps of: acquiring, from a received bitstream, conversion coefficients and information on an intra prediction mode of a current block; generating a prediction sample on the basis of the intra prediction mode for the current block; performing a reverse rotational transformation procedure for the conversion coefficients on the basis of a rotational transformation angle group, and performing a reverse transformation procedure on the basis of transformation kernel information and the result of the reverse rotational transformation procedure so as to generate a residual sample; and generating a restoration picture on the basis of the prediction sample and the residual sample, wherein the rotational transformation angle group is determined on the basis of the intra prediction mode and/or the transformation kernel information. According to the present invention, transformation procedure efficiency is increased, thereby enabling an amount of data for transmitting a residual signal to be reduced and compression efficiency to be improved.
(FR) Selon la présente invention, un procédé permettant de décoder une image, mis en œuvre par un dispositif de décodage, consiste : à acquérir, à partir d'un train de bits reçu, des coefficients de conversion et des informations sur un mode de prédiction intra d'un bloc actuel ; à générer un échantillon de prédiction sur la base du mode de prédiction intra pour le bloc actuel ; à exécuter une procédure de transformation de rotation inverse pour les coefficients de conversion sur la base d'un groupe d'angles de transformation de rotation, et à réaliser une procédure de transformation inverse sur la base des informations de noyau de transformation et le résultat de la procédure de transformation de rotation inverse de manière à générer un échantillon résiduel ; et à générer une image de restauration sur la base de l'échantillon de prédiction et l'échantillon résiduel, le groupe d'angles de transformation de rotation étant déterminé sur la base du mode de prédiction intra et/ou des informations de noyau de transformation. Selon la présente invention, l'efficacité de la procédure de transformation est augmentée, ce qui permet à une quantité de données permettant d'émettre un signal résiduel d'être réduite et à l'efficacité de compression d'être améliorée.
(KO) 본 발명에 따른 디코딩 장치에 의하여 수행되는 영상 디코딩 방법은 수신된 비트스트림으로부터 현재 블록의 인트라 예측 모드에 대한 정보 및 변환 계수들을 획득하는 단계, 상기 현재 블록에 대하여 상기 인트라 예측 모드를 기반으로 예측 샘플을 생성하는 단계, 회전변환 각도군을 기반으로 상기 변환 계수들에 역회전변환 절차를 수행하고, 상기 역회전변환 절차의 결과 및 변환 커널 정보를 기반으로 역변환 절차를 수행하여 레지듀얼 샘플을 생성하는 단계, 상기 예측 샘플 및 상기 레지듀얼 샘플을 기반으로 복원 픽처를 생성하는 단계를 포함하되, 상기 회전변환 각도군은 상기 인트라 예측 모드 및 상기 변환 커널 정보 중 적어도 하나를 기반으로 결정됨을 특징으로 한다. 본 발명에 따르면, 변환 절차의 효율이 상승하고, 이에 따라 레지듀얼 신호의 전송을 위한 데이터량이 줄어들고 압축 효율을 개선시킬 수 있는 효과가 있다.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Korean (KO)
Filing Language: Korean (KO)