Inscribing an axially symmetric polygon and other approximation algorithms for planar convex sets

  • Authors:
  • Hee-Kap Ahn;Peter Brass;Otfried Cheong;Hyeon-Suk Na;Chan-Su Shin;Antoine Vigneron

  • Affiliations:
  • Division of Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, South Korea;Department of Computer Science, City College of New York, USA;Division of Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, South Korea;School of Computing, Soongsil University, Seoul, South Korea;School of Electr. and Inform. Engineering, Hankuk University of Foreign Studies, Yongin, South Korea;Department of Computer Science, National University of Singapore, Singapore

  • Venue:
  • Computational Geometry: Theory and Applications
  • Year:
  • 2006

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Abstract

Given a planar convex set C, we give sublinear approximation algorithms to determine approximations of the largest axially symmetric convex set S contained in C, and the smallest such set S^' that contains C. More precisely, for any @?0, we find an axially symmetric convex polygon Q@?C with area |Q|(1-@?)|S| and we find an axially symmetric convex polygon Q^' containing C with area |Q^'|