Medial Representations: Mathematics, Algorithms and by Kaleem Siddiqi, Stephen Pizer

By Kaleem Siddiqi, Stephen Pizer

The final part century has noticeable the improvement of many organic or actual t- ories that experience explicitly or implicitly concerned medial descriptions of gadgets and different spatial entities in our international. concurrently mathematicians have studied the homes of those skeletal descriptions of form, and, inspired via the numerous components the place medial versions are precious, computing device scientists and engineers have built various algorithms for computing and utilizing those versions. We carry this kno- part and adventure jointly into this e-book that allows you to make medial expertise extra greatly understood and used. The ebook includes an introductory bankruptcy, chapters at the significant mat- matical effects on medial representations, ?ve chapters on algorithms for extracting medial versions from boundary or binary photo descriptions of gadgets, and 3 chapters on functions in snapshot research and different parts of analysis and layout. we are hoping that this ebook will serve the technology and engineering groups utilizing medial types and should supply studying fabric for college students coming into this ?eld. we're lucky to have recruited the various international leaders in medial conception, algorithms, and functions to put in writing chapters during this booklet. We thank them for his or her signi?cant attempt in getting ready their contributions. we have now edited those chapters and feature mixed them with the ?ve chapters that we've got written to supply an built-in entire.

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The fact that the same boundary has to be constructed in two ways gives a consistency relation. The simplest examples of these relations tell us that the detailed geometry of the medial axis at, for example, Y-junctions, is far from arbitrary. 2 Definitions For the convenience of the reader we recap in a suitable form the definitions which will be used in this chapter. The concept of ‘contact’ will be expanded in the next section. The symmetry set of a curve (resp. surface) B is the closure of the locus of centers of circles (resp.

An n-dimensional medial atom of order 0 (n = 2, 3) is a tuple m = {p, r} that satisfies p ∈ R n , r ∈ R+ . 3) Geometrically, a medial atom of order 0 is simply interpreted as a ball. Such medial atoms essentially correspond to maximal inscribed balls whose centers and radii form the medial loci of objects. Given a structured collection of medial atoms of order 0 sampled from the medial locus of an object, it is possible to approximately reconstruct the object’s boundary by “shrink-wrapping” a sheet around the balls defined by the atoms, as shown in Fig.

1, lower right). In fact contact of odd order, that is Ak contact for an even k, always implies that B crosses its circle of curvature, so that the circle can never be maximal and its center can never contribute to the medial axis. • 4-point contact, A3 : a = 0, b = 1/2c2, c3 = 0. This says that, in addition, the origin is an extremum of curvature κ on B (a vertex), since κ ′ (0) = 6c3 where ′ means derivative with respect to x or with respect to arclength on B. When two ordinary (A1 ) contact points come into coincidence, they do so at an A3 point, since the total number of points of contact is then 2 + 2 = 4.

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