Region Based Image Retrieval (RBIR) is an extension of content-based image retrieval techniques . Region-based image retrieval systems provide new query types to search for objects embedded in anarbitrary environment. An RBIR system automatically segments images into a variable number of regions, and uses a segmentation algorithm to extract a set of features (like color, shapes and sketches) for each region. A function determines the differences between the database image and a set of reference regions. Unfortunately, the large evaluation costs of the dissimilarity function are restricting region-based image retrieval to relatively small databases . The most crucial part of this approach is the segmentation of the regions.
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