# Preconditioning 2D integer data for fast convex hull computations

Journal article

Cadenas, O (2016). Preconditioning 2D integer data for fast convex hull computations.

*PLoS ONE.*11 (3).

Authors | Cadenas, O |
---|---|

Abstract | In order to accelerate computing the convex hull on a set of n points, a heuristic procedure is often applied to reduce the number of points to a set of s points, s ≤n, which also contains the same hull. We present an algorithm to precondition 2D data with integer coordinates bounded by a box of size p × q before building a 2D convex hull, with three distinct advantages. First, we prove that under the condition min(p, q) ≤ n the algorithm executes in time within O(n); second, no explicit sorting of data is required; and third, the reduced set of s points forms a simple polygonal chain and thus can be directly pipelined into an O(n) time convex hull algorithm. This paper empirically evaluates and quantifies the speed up gained by preconditioning a set of points by a method based on the proposed algorithm before using common convex hull algorithms to build the final hull. A speedup factor of at least four is consistently found from experiments on various datasets when the condition min(p, q) n ≤holds; the smaller the ratio min(p, q)/n is in the dataset, the greater the speedup factor achieved. |

Keywords | Computing Convex Hull; 2D Integer data; Preconditioning data; MD Multidisciplinary; General Science & Technology |

Year | 2016 |

Journal | PLoS ONE |

Journal citation | 11 (3) |

Publisher | Public Library of Science (PLoS) |

ISSN | 1932-6203 |

Digital Object Identifier (DOI) | doi:10.1371/journal.pone.0149860 |

Publication dates | |

Print | 03 Mar 2016 |

Publication process dates | |

Deposited | 08 May 2017 |

Accepted | 22 Feb 2016 |

Publisher's version | License CC BY 4.0 |

https://openresearch.lsbu.ac.uk/item/874xz

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