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thinning.hh
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26 
27 #ifndef MLN_MORPHO_THINNING_HH
28 # define MLN_MORPHO_THINNING_HH
29 
33 
34 # include <mln/morpho/hit_or_miss.hh>
35 # include <mln/morpho/thickening.hh>
36 
37 #include <mln/io/pgm/save.hh>
38 
39 
40 namespace mln
41 {
42 
43  namespace morpho
44  {
45 
46 
53  template <typename I, typename Wfg, typename Wbg>
54  mln_concrete(I)
55  thinning(const Image<I>& input,
56  const Window<Wfg>& win_fg, const Window<Wbg>& win_bg);
57 
58 
59 # ifndef MLN_INCLUDE_ONLY
60 
61  namespace internal
62  {
63 
64  template <typename I, typename Wfg, typename Wbg>
65  inline
66  void
67  thinning_tests(const Image<I>& input_,
68  const Window<Wfg>& win_fg_,
69  const Window<Wbg>& win_bg_)
70  {
71  const I& input = exact(input_);
72  const Wfg& win_fg = exact(win_fg_);
73  const Wbg& win_bg = exact(win_bg_);
74 
75  // Tests.
76  mln_precondition(input.is_valid());
77  mln_precondition(win_fg.is_centered());
78  mln_precondition(! win_bg.is_empty());
79  mln_precondition((win_fg && win_bg).is_empty());
80 
81  // Avoid warnings.
82  (void) input_;
83  (void) win_fg_;
84  (void) win_bg_;
85  }
86 
87  } // end of namespace mln::morpho::internal
88 
89 
90  template <typename I, typename Wfg, typename Wbg>
91  inline
92  mln_concrete(I)
93  thinning(const Image<I>& input,
94  const Window<Wfg>& win_fg, const Window<Wbg>& win_bg)
95  {
96  mln_trace("morpho::thinning");
97 
98 
99  internal::thinning_tests(input, win_fg, win_bg);
100 
101  mln_concrete(I) output = morpho::minus( input,
102  hit_or_miss(input, win_fg, win_bg) );
103 
104  mln_postcondition( complementation( thickening( complementation(input),
105  win_bg, win_fg ) ) == output);
106  return output;
107  }
108 
109 # endif // ! MLN_INCLUDE_ONLY
110 
111  } // end of namespace mln::morpho
112 
113 } // end of namespace mln
114 
115 
116 #endif // ! MLN_MORPHO_THINNING_HH