CAIN-21: An Extensible and Metadata-Driven Multimedia Adaptation Engine in the MPEG-21 Framework
SAMT '09 Proceedings of the 4th International Conference on Semantic and Digital Media Technologies: Semantic Multimedia
Multimedia Tools and Applications
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The vision of Universal Multimedia Access (UMA) and Universal Multimedia Experience (UME) has driven research in the multimedia community for a long time. Implementing content adaptation frameworks to satisfy heterogeneous types of constraints is among the main requirements for UMA and UME. At the core of these frameworks lies the adaptation decision engine, which computes the appropriate adaptation plans. Though much research has already been done in this domain, the problem of semantic constraints has generally been neglected. This paper addresses the problem of selecting the optimal adaptation operation to satisfy semantic constraints while maximizing the utility of the adapted video. To this end, we define a utility function that computes a value for each possible adaptation operation. We represent our utility function using the MPEG-21 Digital Item Adaptation (DIA) tools. This facilitates the integration of semantic constraints with other types of constraints in MPEG-21 Universal Constraint Description format.