Constrained minimum enclosing circle with center on a query line segment

  • Authors:
  • Sasanka Roy;Arindam Karmakar;Sandip Das;Subhas C. Nandy

  • Affiliations:
  • Indian Statistical Institute, Calcutta, India;Indian Statistical Institute, Calcutta, India;Institut de Mathématiques de Bourgogne, Dijon, France;Indian Statistical Institute, Calcutta, India

  • Venue:
  • MFCS'06 Proceedings of the 31st international conference on Mathematical Foundations of Computer Science
  • Year:
  • 2006

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Abstract

In this paper, we will study the problem of locating the center of smallest enclosing circle of a set P of n points, where the center is constrained to lie on a query line segment. The preprocessing time and space complexities of our proposed algorithm are O(n logn) and O(n) respectively; the query time complexity is O(log2n). We will use this method for solving the following problem proposed by Bose and Wang [3] – given r simple polygons with a total of m vertices along with the point set P, compute the smallest enclosing circle of P whose center lies in one of the r polygons. This can be solved in O( nlogn+mlog2n) time using our method in a much simpler way than [3]; the time complexity of the problem is also being improved.