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In content-based image retrieval systems, the content of an image such as color, shapes and textures are used to retrieve images that are similar to a query image. Most of the existing work focus on the retrieval eectiveness of using content for retrieval, i.e., study the accuracy (in terms of recall and precision) of using dierent representations of content. In this paper, we address the issue of retrieval eciency, i.e., study the speed of retrieval, since a slow system is not useful for largedoi:10.1016/s0169-023x(99)00039-7 fatcat:hqsghqvg6jgmjiafzw6ougefxa