Fast Approximation Algorithms for Art Gallery Problems in Simple Polygons
Computational Geometry
2015-03-17 v1
Abstract
We present approximation algorithms with O(n^3) processing time for the minimum vertex and edge guard problems in simple polygons. It is improved from previous O(n^4) time algorithms of Ghosh. For simple polygon, there are O(n^3) visibility regions, thus any approximation algorithm for the set covering problem with approximation ratio of log(n) can be used for the approximation of n vertex and edge guard problems with O(n^3) visibility sequence. We prove that the visibility of all points in simple polygons is guaranteed by covering O(n^2) sinks from vertices and edges : It comes to O(n^3) time bound.
Cite
@article{arxiv.1101.1346,
title = {Fast Approximation Algorithms for Art Gallery Problems in Simple Polygons},
author = {Dae-Sung Jang and Sun-Il Kwon},
journal= {arXiv preprint arXiv:1101.1346},
year = {2015}
}