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gradient_external.hh
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25 
26 #ifndef MLN_MORPHO_ELEMENTARY_GRADIENT_EXTERNAL_HH
27 # define MLN_MORPHO_ELEMENTARY_GRADIENT_EXTERNAL_HH
28 
32 
33 # include <mln/morpho/elementary/like_ero_fun.hh>
34 # include <mln/morpho/elementary/like_ero_set.hh>
35 
36 
37 namespace mln
38 {
39 
40  namespace morpho
41  {
42 
43  namespace elementary
44  {
45 
46 
47  template <typename I, typename N>
48  mln_concrete(I)
49  gradient_external(const Image<I>& input, const Neighborhood<N>& nbh);
50 
51 
52 # ifndef MLN_INCLUDE_ONLY
53 
54  namespace internal
55  {
56 
57  struct f_grad_ext
58  {
59  template <typename V, typename A>
60  V operator()(const V& input_p, const A& a) const
61  {
62  return a.to_result() - input_p;
63  }
64  };
65 
66  // Dispatch.
67 
68  template <typename I, typename N>
69  mln_concrete(I)
70  gradient_external_dispatch(trait::image::kind::any,
71  const Image<I>& input, const Neighborhood<N>& nbh)
72  {
73  return like_ero_fun(accu::meta::stat::max(), f_grad_ext(), input, nbh);
74  }
75 
76  template <typename I, typename N>
77  mln_concrete(I)
78  gradient_external_dispatch(trait::image::kind::logic,
79  const Image<I>& input, const Neighborhood<N>& nbh)
80  {
81  bool val[] =
82  {
83  0, // ext_value
84  0, // do_duplicate
85  0, // on_input_p
86  1, // on_input_n
87  1, // output_p
88  };
89  return like_ero_set(val, input, nbh);
90  }
91 
92  template <typename I, typename N>
93  mln_concrete(I)
94  gradient_external_dispatch(const Image<I>& input, const Neighborhood<N>& nbh)
95  {
96  return gradient_external_dispatch(mln_trait_image_kind(I)(),
97  input, nbh);
98  }
99 
100  } // end of namespace mln::morpho::elementary::internal
101 
102 
103  // Facade.
104 
105  template <typename I, typename N>
106  mln_concrete(I)
107  gradient_external(const Image<I>& input, const Neighborhood<N>& nbh)
108  {
109  mln_trace("morpho::elementary::gradient_external");
110 
111  mln_precondition(exact(input).is_valid());
112  mln_precondition(exact(nbh).is_valid());
113 
114  mln_concrete(I) output = internal::gradient_external_dispatch(input, nbh);
115 
116  return output;
117  }
118 
119 # endif // ! MLN_INCLUDE_ONLY
120 
121  } // end of namespace mln::morpho::elementary
122 
123  } // end of namespace mln::morpho
124 
125 } // end of namespace mln
126 
127 
128 #endif // ! MLN_MORPHO_ELEMENTARY_GRADIENT_EXTERNAL_HH