서지주요정보
공간계층형 영상 부호화에서 시공간 예측 및 부호화율 배분방법 = Spatio-temporal prediction and bitrate allocation for spatial scalable video coding
서명 / 저자 공간계층형 영상 부호화에서 시공간 예측 및 부호화율 배분방법 = Spatio-temporal prediction and bitrate allocation for spatial scalable video coding / 권순각.
저자명 권순각 ; Kwon, Soon-Kak
발행사항 [대전 : 한국과학기술원, 1998].
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8008398

소장위치/청구기호

학술문화관(문화관) 보존서고

DEE 98006

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초록정보

Spatial scalable video coding is intended for use in applications with the compatibility, and also it has the advantages of channel adaptation and error concealment. The coding performance of the MPEG-2 spatial scalable coding is large dependent on three parts, i.e., the up conversion from the coded picture at the lower layer ("spatial prediction"), the temporal prediction from the previously coded pictures at the higher layer, and the bandwidth allocation to two layers. This dissertation presents some improvement methods for three parts in the MPEG-2 spatial scalable coding. First, a motion-compensated up conversion method is proposed for the spatial prediction. The proposed method obtains the motion information for up conversion from the motion vectors included in the lower layer, so it has advantage in obtaining motion vectors for up conversion without extra transmission. Simulation results show that the spatial prediction by the proposed up conversion method gives a better performance than the conventional one, also that the coding efficiency of the higher layer is improved. Second, two motion estimation methods of the higher layer are proposed in order to reduce the computational complexity for the temporal prediction. In the first one, the motion vector for the higher layer is estimated within the small search range by using the motion vector estimated in the lower layer as an initial vector. In the second one, the motion vector is estimated by spatio-temporally weighted search, based on the estimated motion vector of the lower layer. Simulation results show that the proposed methods give the smaller computational complexity without the degradation of the coding efficiency than the conventional one. Finally, the models of distortion-bitrate relationship for the single and multiple spatial scalable sources are investigated in a fixed total bitrate system. Then the bitrate allocation methods based on the distortion-bitrate models are proposed to satisfy the user requirements of the minimum total distortion and the uniform picture quality on the constraints of bitrate. In the case of fixed bitrate for each layer, the bitrate for each picture-type is allocated to keep the constant picture quality among the picture-types. In the case of fixed total bitrate of two layers, the bitrate for each layer is allocated to give the minimum total distortion of two layers or to keep a constant distortion ratio between two layers. In the case of fixed total bitrate of multiple sources, the bitrate for each source is allocated to the minimum total distortion of the sources or to keep the uniform distortion among the sources. Simulation results show that the proposed bitrate allocation methods can well satisfy the user requirements in comparison to a fixed bitrate allocation method.

서지기타정보

서지기타정보
청구기호 {DEE 98006
형태사항 viii, 150 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Soon-Kak Kwon
지도교수의 한글표기 : 김재균
지도교수의 영문표기 : Jae-Kyoon Kim
수록잡지명 : . IEEE Tr. Consumer Electronics. The Institute of Electrical and Electronics Engineer, vol.38, no.3 (1992)
학위논문 학위논문(박사) - 한국과학기술원 : 전기및전자공학과,
서지주기 참고문헌 : p. 145-150
주제 공간계층형 부호화
부호화율 배분
상향 변환
시간방향 예측
시공간 가중 예측
Spatial scalable coding
Bitrate allocation
Up conversion
Temporal prediction
Spatio-temporally weighted prediction
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