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convolve_directional.hh
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25 
26 #ifndef MLN_LINEAR_CONVOLVE_DIRECTIONAL_HH
27 # define MLN_LINEAR_CONVOLVE_DIRECTIONAL_HH
28 
32 
33 # include <mln/linear/convolve.hh>
34 # include <mln/make/w_window_directional.hh>
35 # include <mln/literal/zero.hh>
36 
37 
38 
39 namespace mln
40 {
41 
42  namespace linear
43  {
44 
57  template <typename I, typename W, unsigned S>
58  mln_ch_convolve(I, W)
59  convolve_directional(const Image<I>& input, unsigned dir, W (&weights)[S]);
60 
61 
62 # ifndef MLN_INCLUDE_ONLY
63 
64  template <typename I, typename W, unsigned S>
65  inline
66  mln_ch_convolve(I, W)
67  convolve_directional(const Image<I>& input, unsigned dir, W (&weights)[S])
68  {
69  trace::entering("linear::convolve_directional");
70 
71  mlc_bool(S % 2 == 1)::check();
72 
73  mln_precondition(exact(input).is_valid());
74  typedef mln_site(I) P;
75  mln_precondition(dir < P::dim);
76 
77  typedef mln_delta(P) D;
78  D dp = literal::zero;
79  ++dp[dir];
80  w_window<D,W> w_win = make::w_window_directional(dp, weights);
81  mln_ch_convolve(I, W) output = convolve(input, w_win);
82 
83  trace::exiting("linear::convolve_directional");
84  return output;
85  }
86 
87 # endif // ! MLN_INCLUDE_ONLY
88 
89  } // end of namespace mln::linear
90 
91 } // end of namespace mln
92 
93 
94 #endif // ! MLN_LINEAR_CONVOLVE_DIRECTIONAL_HH