Discrete & Computational Geometry

, Volume 33, Issue 1, pp 3–25

The Randomized Integer Convex Hull



Let K ⊂ Rd be a sufficiently round convex body (the ratio of the circumscribed ball to the inscribed ball is bounded by a constant) of a sufficiently large volume. We investigate the randomized integer convex hull IL(K) = conv (K ⋂ L), where L is a randomly translated and rotated copy of the integer lattice Zd. We estimate the expected number of vertices of IL(K), whose behaviour is similar to the expected number of vertices of the convex hull of Vol K random points in K. In the planar case we also describe the expectation of the missed area Vol (K \ IL(K)). Surprisingly, for K a polygon, the behaviour in this case is different from the convex hull of random points.


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Copyright information

© Springer Science + Business Media Inc. 2004

Authors and Affiliations

  1. 1.Rényi Institute of Mathematics, Hungarian Academy of Sciences, PO Box 127, 1364 Budapest, Hungary and Department of Mathematics, University College London, Gower Street, London WC1E 6BTEngland
  2. 2.Department of Applied Mathematics and Institute of Theoretical Computer Science (ITI), Charles University, Malostranské nám. 25, 118 00 Praha 1Czech Republic

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