Utility-Based MPEG-21 Video Adaptation for Universal Multimedia Access

UMA를 위한 유틸리티 기반 MPEG-21 비디오 적응

  • 김재곤 (한국전자통신연구원 방송미디어연구부) ;
  • 강경옥 (한국전자통신연구원 방송미디어연구부) ;
  • 김진웅 (한국전자통신연구원 방송미디어연구부) ;
  • 김형명 (KAIST 전자전산학과)
  • Published : 2003.07.01

Abstract

Video adaptation in response to dynamic resource conditions and user preferences is required as a key technology to enable universal multimedia access (UMA) through heterogeneous networks by a multitude of devices in a seamless way. Although many adaptation techniques exist, selections of appropriate adaptations among multiple choices are often ad hoc. To provide a systematic solution, we present a general conceptual framework to model video entity, adaptation, resource, utility, and relations among them. It allows for formulation of various adaptation problems as resource-constrained utility maximization. We apply the framework to a practical case of dynamic bit rate adaptation. Furthermore, we present a description tool, which has been accepted as a part of the MPEG-21 Digital Item Adaptation (DIA), along with a brief overview of the .elated descriptors to support terminal and network quality of service (QoS).

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