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    Metadata details:
    filename: imLabelEdges.m
    path of file: ./repos/matImage/matImage/imFilters
    
    the code of the file until where you have to start completion: function varargout = imLabelEdges(img, varargin)
%IMLABELEDGES Label edges between adjacent regions of labeled image.
%
%   usage:
%   LBL = imLabelEdges(IMG, SE)
%   Return a new image the same dimensions as labeled image IMG, containig
%   zeros everywhere but at boundaries between 2 labels of IMG. The value
%   of the label of the edge is the index of array as defined by IMRAG
%   function (called with the same structuring element).
%
%   If no structuring element is specified, a STREL('DIAMOND', 2) is used as
%   default. It works fine for results of watershed with 4-connectivity.
%
%   [LBL EDGES] = imLabelEdges(IMG, SE)
%   Also return Adjacency graph of image. EDGES is a [NE*2] array, with NE
%   being the number of edges in the image (the max value of LBL).
%   Each line of EDGES contains indices of the two regions adjacent to
%   edge whose index is number of line.
%
%
%   See also:
%   watershed, imRAG, imBoundaryIndices
%
%   -----
%   author : David Legland 
%   INRA - TPV URPOI - BIA IMASTE
%   created the 20/02/2004.
%


    
function varargout = imLabelEdges(img, varargin)
%IMLABELEDGES Label edges between adjacent regions of labeled image.
%
%   usage:
%   LBL = imLabelEdges(IMG, SE)
%   Return a new image the same dimensions as labeled image IMG, containig
%   zeros everywhere but at boundaries between 2 labels of IMG. The value
%   of the label of the edge is the index of array as defined by IMRAG
%   function (called with the same structuring element).
%
%   If no structuring element is specified, a STREL('DIAMOND', 2) is used as
%   default. It works fine for results of watershed with 4-connectivity.
%
%   [LBL EDGES] = imLabelEdges(IMG, SE)
%   Also return Adjacency graph of image. EDGES is a [NE*2] array, with NE
%   being the number of edges in the image (the max value of LBL).
%   Each line of EDGES contains indices of the two regions adjacent to
%   edge whose index is number of line.
%
%
%   See also:
%   watershed, imRAG, imBoundaryIndices
%
%   -----
%   author : David Legland 
%   INRA - TPV URPOI - BIA IMASTE
%   created the 20/02/2004.
%

%   HISTORY
%   24/02/2004 : add doc for 2 arguments in output.


% count number of regions
N = double(max(img(:)));

% if no points or no edges, initialize arrays
edges = [];

labels = uint16(zeros(size(img)));

% compute structuring element
se = strel('diamond', 2);
if ~isempty(varargin)
    se = varargin{1};
end