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An Image Processing Platform
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breadth_first_thinning_constrained.cc
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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 "tests/data.hh"
42 
43 
44 int main()
45 {
46  using namespace mln;
47 
48  typedef image2d<bool> I;
49  typedef neighb2d N;
50 
51  // Add a border of (at least) 1 pixel, to a guarantee a meaningful
52  // result of the computation of connectivity numbers (called within
53  // is_simple_2d); indeed, this computation always expects each pixel
54  // to have 8 neighboring sites.
56 
57  I input = io::pbm::load(MLN_IMG_DIR "/small.pbm");
58 
59  // FIXME: Use a dual neighborhood instead?
60 
61  // Foreground neighborhood.
62  neighb2d nbh_fg = c4();
63  // Background neighborhood.
64  neighb2d nbh_bg = c8();
65 
66  // Simplicity criterion functor.
67  topo::is_simple_point2d<I, N> is_simple(nbh_fg, nbh_bg);
68  // Simple point detach procedure.
69  topo::detach_point<I> detach;
70  // Constraint: do not collapse end points.
71  topo::is_not_end_point<I, N> constraint(nbh_fg, input);
72 
73  I output = topo::skeleton::breadth_first_thinning(input, nbh_fg,
74  is_simple,
75  detach,
76  constraint);
77  io::pbm::save(output, "breadth_first_thinning_constrained-small.pbm");
78 }