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Since multimedia retrieval is based on similarity calculations of semantics and media-based search, exact matches are not expected. We view querying multimedia database as a combination of IR, image matching, and traditional database query processing and it should be conducted in a way of perpetual query reformulation for honing target results. In this paper we present a hybrid multimedia database system, which employs a hierarchical database statistics structure for both query optimization anddblp:conf/vldb/LiCHH97 fatcat:syy5rv5uyrco5krmw36loirjqm