International Journal of Computer Vision

, Volume 60, Issue 3, pp 203–224

Area-Based Medial Axis of Planar Curves

  • Marc Niethammer
  • Santiago Betelu
  • Guillermo Sapiro
  • Allen Tannenbaum
  • Peter J. Giblin
Article

DOI: 10.1023/B:VISI.0000036835.28674.d0

Cite this article as:
Niethammer, M., Betelu, S., Sapiro, G. et al. International Journal of Computer Vision (2004) 60: 203. doi:10.1023/B:VISI.0000036835.28674.d0

Abstract

A new definition of affine invariant medial axis of planar closed curves is introduced. A point belongs to the affine medial axis if and only if it is equidistant from at least two points of the curve, with the distance being a minimum and given by the areas between the curve and its corresponding chords. The medial axis is robust, eliminating the need for curve denoising. In a dynamical interpretation of this affine medial axis, the medial axis points are the affine shock positions of the affine erosion of the curve. We propose a simple method to compute the medial axis and give examples. We also demonstrate how to use this method to detect affine skew symmetry in real images.

medial axisaffine invariantsymmetryareashapepattern recognition

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Marc Niethammer
    • 1
  • Santiago Betelu
    • 2
  • Guillermo Sapiro
    • 3
  • Allen Tannenbaum
    • 1
  • Peter J. Giblin
    • 4
  1. 1.Department of Electrical and Computer EngineeringGeorgia Institute of TechnologyAtlantaUSA
  2. 2.Department of MathematicsUniversity of North TexasDentonUSA
  3. 3.University of MinnesotaMinneapolisUSA
  4. 4.Department of MathematicsUniversity of LiverpoolUK