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Radial Symmetry Detection and Shape Characterization with the Multiscale Area Projection Transform

By Andrea Giachetti and Christian Lovato

Abstract

We introduce a unified optimization framework for geometry processing based on shape constraints. These constraints preserve or prescribe the shape of subsets of the points of a geometric data set, such as polygons, one-ring cells, volume elements, or feature curves. Our method is based on two key concepts: a shape proximity function and shape projection operators. The proximity function encodes the distance of a desired least-squares fitted elementary target shape to the corresponding vertices of the 3D model. Projection operators are employed to minimize the proximity function by relocating vertices in a minimal way to match the imposed shape constraints. We demonstrate that this approach leads to a simple, robust, and efficient algorithm that allows implementing a variety of geometry processing applications, simply by combining suitable projection operators. We show examples for computing planar and circular meshes, shape space exploration, mesh quality improvement, shape-preserving deformation, and conformal parametrization. Our optimization framework provides a systematic way of building new solvers for geometry processing and produces similar or better results than state-of-the-art methods

Topics: Symmetry, Shape retrieval, Salient points, Skeleton
Publisher: 'Wiley'
Year: 2012
DOI identifier: 10.1111/j.1467-8659.2012.03172.x
OAI identifier: oai:iris.univr.it:11562/439141
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