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rgb_to_luma.hh
1 // Copyright (C) 2011 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_FUN_V2V_RGB_TO_LUMA_HH
27 # define MLN_FUN_V2V_RGB_TO_LUMA_HH
28 
29 # include <mln/value/rgb.hh>
30 
31 namespace mln
32 {
33 
34  namespace fun
35  {
36 
37  namespace v2v
38  {
39 
40  template <typename T_luma>
41  struct rgb_to_luma : public Function_v2v< rgb_to_luma<T_luma> >
42  {
43  typedef T_luma result;
44 
45  template <typename T_rgb>
46  T_luma operator()(const T_rgb& rgb) const;
47 
48  };
49 
50 
51 # ifndef MLN_INCLUDE_ONLY
52 
53  template <typename T_luma>
54  template <typename T_rgb>
55  inline
56  T_luma
57  rgb_to_luma<T_luma>::operator()(const T_rgb& rgb) const
58  {
59  float luma = 0.299 * rgb.red() + 0.587 * rgb.green() + 0.114 * rgb.blue();
60  return unsigned(luma + 0.49999);
61  }
62 
63 
64 # endif // !MLN_INCLUDE_ONLY
65 
66  } // end of namespace fun::v2v
67 
68  } // end of namespace fun
69 
70 } // end of namespace mln
71 
72 #endif // ! MLN_FUN_V2V_RGB_TO_LUMA_HH