A hierarchical method to describe multimedia document

The most important purpose of multimedia information retrieval system is to provide overall and detailed description of the content of multimedia data. But currently, most of description methods of multimedia document, such as MPEG-7, have some shortage in providing the description of content information in different layers and different granularities. In this paper, we locate the content information of the multimedia documents into three proper layers and define MDU (Multimedia Document basic Unit) to collect this information in different granularities. And then, we also discuss the relationships among MDUs. Combining the discussion above, we can formalize the presentation of the multimedia documents. An example is provided to explain how to use this presentation method, and we also compare this method with related works.