Fusion Graphs, Region Merging and Watersheds

  • Jean Cousty
  • Gilles Bertrand
  • Michel Couprie
  • Laurent Najman
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4245)


Region merging methods consist of improving an initial segmentation by merging some pairs of neighboring regions. We consider a segmentation as a set of connected regions, separated by a frontier. If the frontier set cannot be reduced without merging some regions then we call it a watershed. In a general graph framework, merging two regions is not straightforward. We define four classes of graphs for which we prove that some of the difficulties for defining merging procedures are avoided. Our main result is that one of these classes is the class of graphs in which any watershed is thin. None of the usual adjacency relations on ℤ2 and ℤ3 allows a satisfying definition of merging. We introduce the perfect fusion grid on ℤ n , a regular graph in which merging two neighboring regions can always be performed by removing from the frontier set all the points adjacent to both regions.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Jean Cousty
    • 1
  • Gilles Bertrand
    • 1
  • Michel Couprie
    • 1
  • Laurent Najman
    • 1
  1. 1.Laboratoire A2SI, Groupe ESIEEInstitut Gaspard-MongeNoisy-le-GrandFrance

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