[Olena-patches] last-svn-commit-780-g011b365 mln/fun/v2v/rgb_to_luma.hh: New function for grayscale conversion.

--- milena/ChangeLog | 5 +++ .../achromatism.hh => mln/fun/v2v/rgb_to_luma.hh} | 32 ++++++++++++------- 2 files changed, 25 insertions(+), 12 deletions(-) copy milena/{sandbox/green/mln/fun/v2v/achromatism.hh => mln/fun/v2v/rgb_to_luma.hh} (67%) diff --git a/milena/ChangeLog b/milena/ChangeLog index c4bed2c..edefc8e 100644 --- a/milena/ChangeLog +++ b/milena/ChangeLog @@ -1,3 +1,8 @@ +2011-03-01 Guillaume Lazzara &lt;z(a)lrde.epita.fr&gt; + + * mln/fun/v2v/rgb_to_luma.hh: New function for grayscale + conversion. + 2011-02-17 Guillaume Lazzara &lt;z(a)lrde.epita.fr&gt; * mln/util/array.hh: Add last() method. diff --git a/milena/sandbox/green/mln/fun/v2v/achromatism.hh b/milena/mln/fun/v2v/rgb_to_luma.hh similarity index 67% copy from milena/sandbox/green/mln/fun/v2v/achromatism.hh copy to milena/mln/fun/v2v/rgb_to_luma.hh index 72b545c..304a798 100644 --- a/milena/sandbox/green/mln/fun/v2v/achromatism.hh +++ b/milena/mln/fun/v2v/rgb_to_luma.hh @@ -1,4 +1,4 @@ -// Copyright (C) 2008, 2009 EPITA Research and Development Laboratory (LRDE) +// Copyright (C) 2011 EPITA Research and Development Laboratory (LRDE) // // This file is part of Olena. // @@ -23,10 +23,10 @@ // exception does not however invalidate any other reasons why the // executable file might be covered by the GNU General Public License. -#ifndef MLN_FUN_V2V_ACHROMATISM_HH -# define MLN_FUN_V2V_ACHROMATISM_HH +#ifndef MLN_FUN_V2V_RGB_TO_LUMA_HH +# define MLN_FUN_V2V_RGB_TO_LUMA_HH -# include <mln/value/rgb8.hh> +# include <mln/value/rgb.hh> namespace mln { @@ -37,22 +37,30 @@ namespace mln namespace v2v { - struct achromatism : public Function_v2v< achromatism > + template <typename T_luma> + struct rgb_to_luma : public Function_v2v< rgb_to_luma<T_luma> > { - typedef float result; + typedef T_luma result; + + template <typename T_rgb> + T_luma operator()(const T_rgb& rgb) const; - float operator()(const value::rgb8 rgb) const; }; + # ifndef MLN_INCLUDE_ONLY - float achromatism::operator()(const value::rgb8 rgb) const + template <typename T_luma> + template <typename T_rgb> + inline + T_luma + rgb_to_luma<T_luma>::operator()(const T_rgb& rgb) const { - return (math::abs(rgb.red() - rgb.green()) - + math::abs(rgb.red() - rgb.blue()) - + math::abs(rgb.green() - rgb.blue()))/3.0; + float luma = 0.299 * rgb.red() + 0.587 * rgb.green() + 0.114 * rgb.blue(); + return unsigned(luma + 0.49999); } + # endif // !MLN_INCLUDE_ONLY } // end of namespace fun::v2v @@ -61,4 +69,4 @@ namespace mln } // end of namespace mln -#endif // ! MLN_FUN_V2V_ACHROMATISM_HH +#endif // ! MLN_FUN_V2V_RGB_TO_LUMA_HH -- 1.5.6.5