gaussian_subsampling.hh

// Copyright (C) 2008, 2009 EPITA Research and Development Laboratory (LRDE)
//
// This file is part of Olena.
//
// Olena is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation, version 2 of the License.
//
// Olena is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Olena.  If not, see <http://www.gnu.org/licenses/>.
//
// As a special exception, you may use this file as part of a free
// software project without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to produce
// an executable, this file does not by itself cause the resulting
// executable to be covered by the GNU General Public License.  This
// exception does not however invalidate any other reasons why the
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#ifndef MLN_SUBSAMPLING_GAUSSIAN_SUBSAMPLING_HH
# define MLN_SUBSAMPLING_GAUSSIAN_SUBSAMPLING_HH


# include <mln/geom/ncols.hh>
# include <mln/geom/nrows.hh>


# include <mln/linear/gaussian.hh>
# include <mln/subsampling/subsampling.hh>



namespace mln
{

  namespace subsampling
  {

    template <typename I>
    inline
    mln_concrete(I)
    gaussian_subsampling(const Image<I>& input, float sigma,
                         const mln_dpsite(I)& first_p,
                         const mln_deduce(I, site, coord)& gap);

# ifndef MLN_INCLUDE_ONLY


    template <typename I>
    inline
    mln_concrete(I)
    gaussian_subsampling(const Image<I>& input, float sigma,
                         const mln_dpsite(I)& first_p,
                         const mln_deduce(I, site, coord)& gap)
    {
      trace::entering("subsampling::gaussian_subsampling");
      mln_precondition(exact(input).is_valid());

      mln_concrete(I) temp(exact(input).domain());
      mln_concrete(I) output(geom::nrows(input) / gap,
                             geom::ncols(input) / gap); //FIXME : image2d only

      linear::gaussian(input, 0.1, temp);
      output = impl::subsampling_(exact(temp), first_p, gap);

      trace::exiting("subsampling::gaussian_subsampling");
      return output;
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::subsampling

} // end of namespace mln


#endif // ! MLN_SUBSAMPLING_GAUSSIAN_SUBSAMPLING_HH