se_stat.hh

// Copyright (C) 2004  EPITA Research and Development Laboratory
//
// This file is part of the Olena Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License version 2 as published by the
// Free Software Foundation.
//
// This library 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 this library; see the file COPYING.  If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
// MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free
// software library 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 executable file might be covered by the GNU General
// Public License.


#ifndef OLN_UTILS_SE_STAT_HH
# define OLN_UTILS_SE_STAT_HH

# include <oln/core/abstract/point.hh>
# include <oln/core/abstract/image.hh>
# include <oln/core/abstract/struct_elt.hh>

# include <ntg/core/abstract_hierarchy.hh>
# include <ntg/all.hh>
# include <ntg/core/macros.hh>
# include <oln/math/macros.hh>

namespace oln {
  namespace utils {
    namespace internal {
      template <typename DestT,
                typename SrcT>
      struct f_to_float_
      {
        static
        DestT
        doit(const SrcT& s)
        {
          return s;
        }
      };

      template <unsigned ncomps,
                unsigned qbits,
                template <unsigned> class color_system>
      struct f_to_float_<typename ntg::color<ncomps,
                                             qbits,
                                             color_system>::float_vec_type,
                         ntg::color<ncomps, qbits, color_system> >
      {
        static
        typename ntg::color<ncomps, qbits, color_system>::float_vec_type
        doit(const ntg::color<ncomps, qbits, color_system>& s)
        {
          return s.to_float();
        }
      };
    } // end namespace internal


    template <typename Sum = ntg::float_s, typename Var = ntg::float_s>
    class se_stat
    {
    public:
      typedef Sum sum_type;
      typedef Var variance_type;

      template <class I, class S>
      se_stat(const oln::abstract::image<I> &im,
              const oln_point_type(I) &p,
              const oln::abstract::struct_elt<S> &s)
      {
        compute(im, p, s);
      }

      template <class I, class S>
      se_stat &
      compute(const oln::abstract::image<I> &im,
              const oln_point_type(I) &p,
              const oln::abstract::struct_elt<S> &s);

      inline Sum
      mean() const
      {
        return mean_;
      }

      inline Var
      variance() const
      {
        return variance_;
      }

      inline Sum
      sum() const
      {
        return sum_;
      }

      inline unsigned
      card() const
      {
        return card_;
      }

    protected:
      Var variance_;    
      Sum mean_;        
      Sum sum_;         
      int card_;        
    };

  } // end namespace utils

} // end namespace oln

#include "se_stat.hxx"

#endif 

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