laplacian.hh

// Copyright (C) 2007, 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.
//
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
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// along with Olena.  If not, see <http://www.gnu.org/licenses/>.
//
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// software project without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
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// an executable, this file does not by itself cause the resulting
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#ifndef MLN_MORPHO_ELEMENTARY_LAPLACIAN_HH
# define MLN_MORPHO_ELEMENTARY_LAPLACIAN_HH


# include <mln/morpho/elementary/gradient_internal.hh>
# include <mln/morpho/elementary/gradient_external.hh>


namespace mln
{

  namespace morpho
  {

    namespace elementary
    {

      template <typename I, typename N>
      mln_trait_op_minus_twice(mln_concrete(I))
      laplacian(const Image<I>& input, const Neighborhood<N>& nbh);


# ifndef MLN_INCLUDE_ONLY

      template <typename I, typename N>
      inline
      mln_trait_op_minus_twice(mln_concrete(I))
      laplacian(const Image<I>& input, const Neighborhood<N>& nbh)
      {
        trace::entering("morpho::elementary::laplacian");

        mln_precondition(exact(input).is_valid());
        mln_precondition(exact(nbh).is_valid());

        mln_trait_op_minus_twice(mln_concrete(I)) output;
        output = gradient_external(input, nbh) - gradient_internal(input, nbh);

        trace::exiting("morpho::elementary::laplacian");
        return output;
      }

# endif // ! MLN_INCLUDE_ONLY

    } // end of namespace mln::morpho::elementary

  } // end of namespace mln::morpho

} // end of namespace mln


#endif // ! MLN_MORPHO_ELEMENTARY_LAPLACIAN_HH