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We present a fast and efficient geometric re-ranking method that can be incorporated in a feature based image-based retrieval system that utilizes a Vocabulary Tree (VT). We form feature pairs by comparing descriptor classification paths in the VT and calculate geometric similarity score of these pairs. We propose a location geometric similarity scoring method that is invariant to rotation, scale,...
Deciding the convex separability of the classes is an interesting question in the data exploration phase of building classification systems. In this paper we propose an efficient algorithm for deciding the convex separability of two point sets in Rd. We compare our algorithm with conventional methods on 6 benchmark problems, and demonstrate that our algorithm is significantly faster.
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