On Symmetry Detection

@article{Atallah1985OnSD,
  title={On Symmetry Detection},
  author={Mikhail J. Atallah},
  journal={IEEE Transactions on Computers},
  year={1985},
  volume={C-34},
  pages={663-666}
}
A straight line is an axis ofsymmetry of a planar figure if the figure is invariant to reflection with respect to that line. The purpose of this correspondence is to describe an O( n log n) time algorithm for enumerating all the axes of symmetry of a planar figure which is made up of (possibly intersecting) segments, circles, points, etc. The solution involves a reduction of the problem to a combinatorial question on words. Our algorithm is optimal since we can establish an Ω(n log n) time… CONTINUE READING

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