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elementary/laplacian.hh
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25 
26 #ifndef MLN_MORPHO_ELEMENTARY_LAPLACIAN_HH
27 # define MLN_MORPHO_ELEMENTARY_LAPLACIAN_HH
28 
34 
35 # include <mln/morpho/elementary/gradient_internal.hh>
36 # include <mln/morpho/elementary/gradient_external.hh>
37 
38 
39 namespace mln
40 {
41 
42  namespace morpho
43  {
44 
45  namespace elementary
46  {
47 
51  template <typename I, typename N>
52  mln_trait_op_minus_twice(mln_concrete(I))
53  laplacian(const Image<I>& input, const Neighborhood<N>& nbh);
54 
55 
56 # ifndef MLN_INCLUDE_ONLY
57 
58  template <typename I, typename N>
59  inline
60  mln_trait_op_minus_twice(mln_concrete(I))
61  laplacian(const Image<I>& input, const Neighborhood<N>& nbh)
62  {
63  mln_trace("morpho::elementary::laplacian");
64 
65  mln_precondition(exact(input).is_valid());
66  mln_precondition(exact(nbh).is_valid());
67 
68  mln_trait_op_minus_twice(mln_concrete(I)) output;
69  output = gradient_external(input, nbh) - gradient_internal(input, nbh);
70 
71  return output;
72  }
73 
74 # endif // ! MLN_INCLUDE_ONLY
75 
76  } // end of namespace mln::morpho::elementary
77 
78  } // end of namespace mln::morpho
79 
80 } // end of namespace mln
81 
82 
83 #endif // ! MLN_MORPHO_ELEMENTARY_LAPLACIAN_HH