GROPEN Morphological opening on graph.

   LBL2 = grOpen(EDGES, LBL1)
   The labels are the result of a morphological erosion followed by a
   morphological dilation.

   Example
   grOpen

   See also
   grClose, grErode, grDilate


 ------
 Author: David Legland
 e-mail: david.legland@grignon.inra.fr
 Created: 2006-01-20
 Copyright 2006 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas).

Package: matgeom