grDilate

GRDILATE Morphological dilation on graph.

   LBL2 = grDilate(EDGES, LBL1)
   Each label of the graph is assigned the highest label of its
   neighbours, or it keeps the same label this one is bigger.

   Example
   grDilate

   See also
   grErode, grOpen, grClose

0001 function varargout = grDilate(varargin)
0002 %GRDILATE Morphological dilation on graph.
0003 %
0004 %   LBL2 = grDilate(EDGES, LBL1)
0005 %   Each label of the graph is assigned the highest label of its
0006 %   neighbours, or it keeps the same label this one is bigger.
0007 %
0008 %   Example
0009 %   grDilate
0010 %
0011 %   See also
0012 %   grErode, grOpen, grClose
0013 %
0014 
0015 % ------
0016 % Author: David Legland
0017 % E-mail: david.legland@inrae.fr
0018 % Created: 2006-01-20
0019 % Copyright 2006-2024 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
0020 
0021 if length(varargin) == 2
0022     edges   = varargin{1};
0023     lbl     = varargin{2};
0024 elseif length(varargin) == 3
0025     edges   = varargin{2};
0026     lbl     = varargin{3};
0027 else
0028     error('Wrong number of arguments in "grDilate"');
0029 end
0030    
0031 
0032 lbl2 = zeros(size(lbl));
0033 
0034 uni = unique(edges(:));
0035 for n = 1:length(uni)
0036     neigh = grAdjacentNodes(edges, uni(n));
0037     lbl2(uni(n)) = max(lbl([uni(n); neigh]));    
0038 end
0039 
0040 varargout{1} = lbl2;