Download Curve and Surface Reconstruction by Tamal K. Dey PDF

By Tamal K. Dey

Many functions in technology and engineering require a electronic version of a true actual item. complex scanning know-how has made it attainable to experiment such items and generate element samples on their limitations. This publication indicates the way to compute a electronic version from this aspect pattern. After constructing the fundamentals of sampling idea and its connections to numerous geometric and topological houses, the writer describes a set of algorithms which were designed for the reconstruction challenge, together with algorithms for floor reconstruction from dense samples, from samples that aren't appropriately dense and from noisy samples. Voronoi and Delaunay dependent strategies, implicit floor dependent equipment and Morse conception established equipment are lined. Scientists and engineers operating in drug layout, scientific imaging, CAD, GIS, and plenty of different components will make the most of this primary ebook at the subject.Provides basics of aspect cloud information processing Algorithms with correctness proofs are offered Many figures, a collection of routines, and a short heritage for every bankruptcy.

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Extra resources for Curve and Surface Reconstruction

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We assume that the normals are oriented outward. More precisely, nx points locally to the unbounded component of R3 \ . If is not where x connected, nx points locally to the unbounded component of R3 \ is in , a connected component of . An important fact used in surface reconstruction is that, disregarding the orientation, the direction of the surface normals can be approximated from the sample. An illustration in R2 is helpful here. 4 in Chapter 2 which shows the Voronoi diagram of a dense sample on a smooth curve.

This space is a k-ball which contradicts the fact that B ∩ is not a k-ball to begin with. Therefore, as B is continually shrunk, it becomes tangent to at a point y = m. Apply the previous argument to claim that B has a medial axis point. 8 illustrates the different cases of Feature Ball Lemma in R2 . 2 Local Feature Size The medial axis M with the distance to at each point m ∈ M captures the shape of . In fact, is the boundary of the union of all medial balls centering points of the inner (or outer) medial axis.

3 Voronoi Diagram and Delaunay Triangulation 21 The triangle emptiness property of Delaunay triangles also implies a similar emptiness for Delaunay edges. Clearly, each Delaunay edge has an empty circumscribing ball passing through its endpoints. It turns out that the converse is also true, that is, any edge pq with an empty circumscribing ball must also be in the Delaunay triangulation. To see this, grow the empty ball of pq always keeping p, q on its boundary. If it never meets any other point from P, the edge pq is on the boundary of Conv P and is in the Delaunay triangulation since V p and Vq has to share an edge extending to infinity.

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