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An Optimal Framework of Video Adaptation and Its Application to Rate Adaptation Transcoding
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- 저자
- 김재곤, Yong Wang, Shih-Fu Chang, 김형명
- 발행일
- 200508
- 출처
- ETRI Journal, v.27 no.4, pp.341-354
- ISSN
- 1225-6463
- 출판사
- 한국전자통신연구원 (ETRI)
- 협약과제
- 05MR3100, 통방융합 환경에서의 유비쿼터스 콘텐츠 서비스 기술 개발, 홍진우
- 초록
- The adaptation of video according to the heterogeneous and dynamic resource constraints on networks and devices, as well as on user preferences, is a promising approach for universal access and consumption of video content. For optimal adaptation that satisfies the constraints while maximizing the utility that results from the adapted video, it is necessary to devise a systematic way of selecting an appropriate adaptation operation among multiple feasible choices. This paper presents a general conceptual framework that allows the formulation of various adaptations as constrained optimization problems by modeling the relations among feasible adaptation operations, constraints, and utilities. In particular, we present the feasibility of the framework by applying it to a use case of rate adaptation of MPEG-4 video with an explicit modeling of adaptation employing a combination of frame dropping and discrete cosine transform coefficient dropping, constraint, utility, and their mapping relations. Furthermore, we provide a description tool that describes the adaptation-constraint-utility relations as a functional form referred to as a utility function, which has been accepted as a part of the terminal and network quality of service tool in MPEG-21 Digital Item Adaptation (DIA).
- KSP 제안 키워드
- Conceptual framework, Discrete cosine Transform, Dynamic resource, Explicit Modeling, Frame dropping, MPEG-21, MPEG-4 video, Network quality of service, Rate adaptation, Resource constraints, Use Cases