Pattern Analysis and Applications

, Volume 17, Issue 3, pp 481–496 | Cite as

Geometric algorithm for dominant point extraction from shape contour

  • Maedeh S. Tahaei
  • Seyed Naser Hashemi
  • Ali Mohades
  • Amin Gheibi
Theoretical Advances

Abstract

In this paper we propose a new algorithm for extracting dominant points from the real contour of a digital shape. A polygonal approximation of the shape can be obtained by the set of dominant points. In the proposed algorithm, in the first step before searching for dominant points, the real contour is made sparse using a geometric concept, named convex deficiency tree. This helps to select a set of candidate points from real contour. In comparison with break points (which are initial points in many algorithms), the set of candidate points is more heuristic and the ratio of them to the all points of the contour is lower. In the second step of the proposed algorithm, the less informative candidate points are removed in an iterative manner. After removing one candidate point, its adjacent positions are searched to find more stable position for its neighbors. The comparative result of the proposed algorithm with others shows its efficiency. The algorithm finds an effective polygonal approximation for digital shapes especially for the real contours, which makes the method more practical.

Keywords

Dominant point Polygonal approximation Digital planner curve Shape representation Convex deficiency tree 

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Copyright information

© Springer-Verlag London 2012

Authors and Affiliations

  • Maedeh S. Tahaei
    • 1
  • Seyed Naser Hashemi
    • 1
  • Ali Mohades
    • 1
  • Amin Gheibi
    • 2
  1. 1.Department of Mathematics and Computer ScienceAmirkabir University of TechnologyTehranIran
  2. 2.Department of Computer ScienceCarleton UniversityOttawaCanada

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