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convolve_directional.hh
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26 
27 #ifndef MLN_LINEAR_CONVOLVE_DIRECTIONAL_HH
28 # define MLN_LINEAR_CONVOLVE_DIRECTIONAL_HH
29 
33 
34 # include <mln/linear/convolve.hh>
35 # include <mln/make/w_window_directional.hh>
36 # include <mln/literal/zero.hh>
37 
38 
39 
40 namespace mln
41 {
42 
43  namespace linear
44  {
45 
60  template <typename I, typename W, unsigned S>
61  mln_ch_convolve(I, W)
62  convolve_directional(const Image<I>& input, unsigned dir, W (&weights)[S]);
63 
64 
65 # ifndef MLN_INCLUDE_ONLY
66 
67  template <typename I, typename W, unsigned S>
68  inline
69  mln_ch_convolve(I, W)
70  convolve_directional(const Image<I>& input, unsigned dir, W (&weights)[S])
71  {
72  mln_trace("linear::convolve_directional");
73 
74  mlc_bool(S % 2 == 1)::check();
75 
76  mln_precondition(exact(input).is_valid());
77  typedef mln_site(I) P;
78  mln_precondition(dir < P::dim);
79 
80  typedef mln_delta(P) D;
81  D dp = literal::zero;
82  ++dp[dir];
83  w_window<D,W> w_win = make::w_window_directional(dp, weights);
84  mln_ch_convolve(I, W) output = convolve(input, w_win);
85 
86  return output;
87  }
88 
89 # endif // ! MLN_INCLUDE_ONLY
90 
91  } // end of namespace mln::linear
92 
93 } // end of namespace mln
94 
95 
96 #endif // ! MLN_LINEAR_CONVOLVE_DIRECTIONAL_HH