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Content based image retrieval (CBIR), a technique which uses visual contents to search images from the large scale image databases, is an active area of research for the past decade. It is increasingly evident that an image retrieval system has to be domain specific. In this paper, we present an algorithm for retrieving images with respect to a database… (More)

We present an algorithm for generating the Voronoi cells for a set of rational C<sup>1</sup>-continuous planar closed curves, which is precise up to machine precision. Initially, bisectors for pairs of curves, (<i>C(t), C<sup>i</sup>(r))</i>, are generated symbolically and represented as implicit forms in the <i>tr</i>-parameter space. Then, the bisectors… (More)

This paper presents the summary of all the results of the participants in the event SHREC08 – CAD Model Track. 1 INTRODUCTION Engineering parts typically have high genus, rounding features (fillets, chamfers), and presence of an internal structure. They are closed watertight volumes. Engineering models can be parts or assemblies. A part is an atomic unit… (More)

The problem of computing the minimum enclosing sphere (MES) of a point set is a classical problem in Computational Geometry. As an LP-type problem, its expected running time on the average is linear in the number of points. In this paper, we generalize this approach to compute the minimum enclosing sphere of free-form hypersurfaces, in arbitrary dimensions.… (More)

We present an algorithm for generating Voronoi cells for a set of planar piecewise C 1-continuous closed rational curves, which is precise up to machine precision. The algorithm starts with the symbolically generated bisectors for pairs of C 1-continuous curve segments (C(t),C i (r)). The bisectors are represented implicitly in the tr-parameter space. Then,… (More)

Given a finite set of points S ⊆ R 2 , we define a proximity graph called as shape-hull graph(SHG(S)) that contains all Gabriel edges and a few non-Gabriel edges of Delaunay triangulation of S. For any S, SHG(S) is topologically regular with its boundary (referred to as shape-hull(SH)) homeomorphic to a simple closed curve. We introduce the concept of… (More)

While random polygon generation from a set of planar points has been widely investigated in the literature, very few works address the construction of a simple polygon with minimum area (MINAP) or maximum area (MAXAP) from a set of fixed planar points. Currently, no deterministic algorithms are available to compute MINAP/MAXAP, as the problems have been… (More)