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image2d-skel-with-end-points.cc
1 // Copyright (C) 2010, 2012 EPITA Research and Development Laboratory (LRDE)
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3 // This file is part of Olena.
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24 // executable file might be covered by the GNU General Public License.
25 
29 
30 #include <mln/core/image/image2d.hh>
31 #include <mln/core/alias/neighb2d.hh>
32 
33 #include <mln/topo/skeleton/breadth_first_thinning.hh>
34 
35 #include <mln/topo/is_simple_point2d.hh>
36 #include <mln/topo/detach_point.hh>
37 #include <mln/topo/is_not_end_point.hh>
38 
39 #include <mln/io/pbm/all.hh>
40 
41 #include <mln/util/timer.hh>
42 
43 
44 int
45 main(int argc, char* argv[])
46 {
47  using namespace mln;
48 
49  if (argc != 3)
50  {
51  std::cerr << "usage: " << argv[0] << " input.pbm output.pbm"
52  << std::endl;
53  std::exit(1);
54  }
55 
56  std::string input_filename = argv[1];
57  std::string output_filename = argv[2];
58 
59  typedef image2d<bool> I;
60  typedef neighb2d N;
61 
62  // Add a border of (at least) 1 pixel, to a guarantee a meaningful
63  // result of the computation of connectivity numbers (called within
64  // is_simple_2d); indeed, this computation always expects each pixel
65  // to have 8 neighboring sites.
67 
68  I input = io::pbm::load(input_filename);
69  std::cout << input.nrows() << " x " << input.ncols() << " = "
70  << input.nrows() * input.ncols() << " pixels"
71  << std::endl;
72 
73  // Foreground neighborhood.
74  neighb2d nbh_fg = c4();
75  // Background neighborhood.
76  neighb2d nbh_bg = c8();
77 
78  // Simplicity criterion functor.
79  topo::is_simple_point2d<I, N> is_simple(nbh_fg, nbh_bg);
80  // Simple point detach procedure.
81  topo::detach_point<I> detach;
82  // Constraint: do not remove end points.
83  topo::is_not_end_point<I, N> constraint(nbh_fg, input);
84 
85  util::timer t;
86  t.start();
87  I output = topo::skeleton::breadth_first_thinning(input, nbh_fg,
88  is_simple, detach,
89  constraint);
90  t.stop();
91  std::cout << t.read() << " s" << std::endl;
92 
93  io::pbm::save(output, output_filename);
94 }