Nearest neighbors search using point location in balls with applications to approximate Voronoi decompositions

  • Authors:
  • Yogish Sabharwal;Nishant Sharma;Sandeep Sen

  • Affiliations:
  • IBM India Research Lab, IIT Delhi, Hauz Khas, New Delhi, India;Department of Computer Science and Engineering, IIT, New Delhi, India;Department of Computer Science and Engineering, IIT, New Delhi, India

  • Venue:
  • Journal of Computer and System Sciences
  • Year:
  • 2006

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Abstract

We present alternate reductions of the nearest neighbor searching problem to Point Location in Balls that reduces the space bound of Sariel Har-Peled's [S. Har-Peled, A replacement for Voronoi diagrams of near linear size, in: Proc. of IEEE FOCS, 2001, pp. 94-103, full version available from http://www.uiuc.edu/~sariel/papers] recent result on Approximate Voronoi Diagrams to linear while maintaining the logarithmic search time. We do this by simplifying the construction of [S. Har-Peled, A replacement for Voronoi diagrams of near linear size, in: Proc. of IEEE FOCS, 2001, pp. 94-103, full version available from http://www.uiuc. edu/~sariel/papers] that reduces the number of balls generated by algorithm by a logarithmic factor to O(n log n). We further reduce the number of balls by a new hierarchical decomposition scheme and a generalization of PLEBs to achieve linear space decomposition for nearest neighbor searching. The construction of our data structures takes O(n log n) time.