The explosion of the number of Web pages also leads to countless accessible multimedia objects. Their abundance makes the Internet an interesting application for multimedia retrieval systems. Many search engines are going about to supply some retrieval functionality for independent retrieval of these objects. However, most of these multimedia search engines aim at a fixed set of multimedia index attributes. The Acoi system provides an extensible framework for retrieving multimedia objects of any type on basis of their content, based on both low-level features and high-level concepts, and context.

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Windhouwer, M.A, Schmidt, A.R, & Kersten, M.L. (2000). Acoi: A System for Indexing Multimedia Objects. In Proceedings of International World Wide Web Conference 2000 (WWW 0).