Journal ArticleDOI
Reconstructing convex polygons and convex polyhedra from edge and face counts in orthogonal projections
TLDR
3D reconstructing convex polygons and convex polyhedra given the number of visible edges and visible faces in some orthogonal projections is studied and it is shown that the problem becomes NP-hard when the directions are covered by three or more planes.Abstract:
We study the problem of reconstructing convex polygons and convex polyhedra given the number of visible edges and visible faces in some orthogonal projections. In 2D, we find necessary and sufficient conditions for the existence of a feasible polygon of size N and give an algorithm to construct one, if it exists. When N is not known, we give an algorithm to find the maximum and minimum sizes of a feasible polygon. In 3D, when the directions are covered by a single plane we show that a feasible polyhedron can be constructed from a feasible polygon. We also give an algorithm to construct a feasible polyhedron when the directions are covered by two planes. Finally, we show that the problem becomes NP-hard when the directions are covered by three or more planes.read more
Citations
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Journal ArticleDOI
Efficient view point selection for silhouettes of convex polyhedra
TL;DR: This paper gives algorithms to find all projections of a convex polyhedron such that a given set of edges, faces and/or vertices appear on the silhouette, and presents an algorithm to solve this problem in O(k^2) time for k edges.
Journal Article
Efficient view point selection for silhouettes of convex polyhedra
TL;DR: In this paper, the authors presented an algorithm to find all projections of a convex polyhedron such that a given set of edges, faces and/or vertices appear on the silhouette.
References
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Proceedings ArticleDOI
Image-based visual hulls
TL;DR: This paper describes an efficient image-based approach to computing and shading visual hulls from silhouette image data that takes advantage of epipolar geometry and incremental computation to achieve a constant rendering cost per rendered pixel.
Journal ArticleDOI
The Four-Colour Theorem
TL;DR: Another proof is given, still using a computer, but simpler than Appel and Haken's in several respects, that every loopless planar graph admits a vertex-colouring with at most four different colours.
Journal ArticleDOI
Optimization-based reconstruction of a 3D object from a single freehand line drawing
Hod Lipson,Moshe Shpitalni +1 more
TL;DR: This paper describes an optimization-based algorithm for reconstructing a 3D model from a single, inaccurate, 2D edge-vertex graph, which serves as input for the reconstruction process, and examples from a working implementation are given.
BookDOI
Advances in discrete tomography and its applications
Gabor T. Herman,Attila Kuba +1 more
TL;DR: A. Kuba and G.T. Herman Discrete point X-ray (DPT) reconstruction as discussed by the authors is a well-known technique in the field of discrete tomography.
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