Aligning Two Convex Figures to Minimize Area or Perimeter

Aligning Two Convex Figures to Minimize Area or Perimeter

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Article ID: iaor2012399
Volume: 62
Issue: 1
Start Page Number: 464
End Page Number: 479
Publication Date: Feb 2012
Journal: Algorithmica
Authors: ,
Keywords: sets, programming: convex, optimization
Abstract:

Given two compact convex sets P and Q in the plane, we consider the problem of finding a placement ϕ P of P that minimizes the convex hull of ϕ PQ. We study eight versions of the problem: we consider minimizing either the area or the perimeter of the convex hull; we either allow ϕ P and Q to intersect or we restrict their interiors to remain disjoint; and we either allow reorienting P or require its orientation to be fixed. In the case without reorientations, we achieve exact near‐linear time algorithms for all versions of the problem. In the case with reorientations, we compute a (1+ϵ)‐approximation in time O(ϵ -1/2log n+ϵ -3/2log a (1/ϵ)) if the two sets are convex polygons with n vertices in total, where a∈{0,1,2} depending on the version of the problem.

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