2D Grey-Level Convex Hull Computation: A Discrete 3D Approach

  • Ingela Nyström
  • Gunilla Borgefors
  • Gabriella Sanniti di Baja
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2749)


We compute discrete convex hulls in 2D grey-level images, where we interpret grey-level values as heights in 3D landscapes. For these 3D objects, using a 3D binary method, we compute approximations of their convex hulls. Differently from other grey-level convex hull algorithms, producing results convex only in the geometric sense, our convex hull is convex also in the grey-level sense.


shape representation grey-level morphology concavity analysis convex deficiency 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Ingela Nyström
    • 1
  • Gunilla Borgefors
    • 2
  • Gabriella Sanniti di Baja
    • 3
  1. 1.Centre for Image AnalysisUppsala UniversityUppsalaSweden
  2. 2.Centre for Image AnalysisSwedish University for Agricultural SciencesUppsalaSweden
  3. 3.Istituto di CiberneticaNational Research Council of Italy (CNR)Pozzuoli (Napoli)Italy

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