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An MPEG7 query language and a user preference model that allow semantic retrievaland filtering of multimedia content

Christodoulakis Stavros, Chrisa Tsinaraki

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Summary

We present in this paper the MPEG-7 Query Language (MP7QL), a powerful query language that we have developed for queryingMPEG-7 descriptions, as well as its compatible Filtering and Search Preferences (FASP) model. The MP7QL has the MPEG-7 asdata model and allows for querying every aspect of an MPEG-7 multimedia content description. It allows the users to expressthe conditions that should hold for the multimedia content returned to them regarding semantics, low-level visual and audiofeatures and media-related aspects. The MP7QL queries may utilize the users’ FASP and Usage History as context, thus allowingfor personalized multimedia content retrieval. The FASP model supported is compatible with the MP7QL and has the model ofthe standard MPEG-7 FASPs as a special case. The proposed FASPs essentially are MP7QL queries. Both the MP7QL and its compatibleFASP model allow for the exploitation of domain knowledge encoded using pure MPEG-7 constructs. In addition, they allow theexplicit specification of boolean operators and/or preference values in order to allow both the combination of the query conditionsaccording to the user intentions and the expression of the importance of the individual conditions for the users. The MP7QLquery results are represented as MPEG-7 documents, guaranteeing the closure of the results within the MPEG-7 space. The MP7QLand the FASP model have been expressed using both XML Schema and OWL syntax. An implementation of the MP7QL, on top of anXML Native Database is currently in progress. A real world-world evaluation study on the expressive power of the MP7QL showsthat it covers both general purpose and domain specific requirements in multimedia content retrieval.

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