Abstract
In this paper we present a contextual representation model of audiovisual (AV) documents for AV information systems. In the first part, we study AV medium, and show that AV intra-document context is always related to a user task seen as a general description task. We then present the AI-Strata model for AV description: audiovisual units (pieces of AV documents) are annotated with annotation elements described in a knowledge base. The annotation elements are connected at the document level. The whole system being considered as a single graph, we define a context of one element as end points of graph-paths starting with this element. In order to control contextual paths, we define the notion of potential graphs as graph-patterns instantiated in the general graph. Finally, we show how these graphs are used in the main task of AV information system: navigation, indexing and retrieval.
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