In recent years, the world has seen a tremendous increase in the capability to create, share and store multimedia items, i.e. a combination of pictorial, linguistic, and auditory data. Moreover, in emerging multimedia applications, generation, processing, storage, indexing, querying, retrieval, delivery, shielding, and visualization of multimedia content are integrated issues, all taking place at the same time and - potentially - at different administrative domains. As a result of these trends, a number of novel and hard research questions arise, which can be answered only by applying techniques of parallel, distributed, and Grid computing.
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