ChangeLog | 7 ++ oln/convert/stretch.hh | 130 +++++++++++++++++++++++++++++++++++++++++++++++++ oln/makefile.src | 1 3 files changed, 138 insertions(+) Index: olena/ChangeLog from Roland Levillain &lt;roland(a)lrde.epita.fr&gt; Add stretch conversions. * oln/convert/stretch.hh: New file. * oln/makefile.src (OLN_DEP): Add convert/stretch.hh. 2005-07-04 Roland Levillain &lt;roland(a)lrde.epita.fr&gt; Index: olena/oln/convert/stretch.hh --- olena/oln/convert/stretch.hh (révision 0) +++ olena/oln/convert/stretch.hh (révision 0) @@ -0,0 +1,130 @@ +// Copyright (C) 2001, 2002, 2003, 2004, 2005 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 OLENA_CONVERT_STRETCH_HH +# define OLENA_CONVERT_STRETCH_HH + +# include <oln/core/ch_value_type.hh> + +# include <oln/basics.hh> +# include <ntg/basics.hh> + +# include <oln/convert/abstract/conversion.hh> + +# include <set> +# include <vector> + +namespace oln { + + namespace convert { + + // FIXME: Documentation (see in Olena 0.10). + + /// Functor to stretch a value from a range Input to a range Output. + template<class Output> + struct stretch + : public abstract::conversion_to_type<Output, stretch<Output> > + { + template <class Input> + Output + doit(const Input& v) const + { + return Output(ntg::cast::rbound<Output, float>( + double(v - ntg_min_val(Input)) / + double(ntg_max_val(Input) - ntg_min_val(Input)) * + (ntg_max_val(Output) - ntg_min_val(Output)) + + ntg_min_val(Output))); + } + + static std::string + name() + { + // FIXME: Exact is not an integre type ! + // return std::string("stretch<") + ntg_name(Output) + ", " + + // Exact::name() + ">"; + return std::string("stretch<") + ntg_name(Output) + ">"; + } + }; + + + // FIXME: Documentation (see in Olena 0.10). + + /// Stretch the value of an image. + template<class DestValue, class I> + typename ch_value_type<I, DestValue>::ret + stretch_balance(const oln::abstract::scalar_valued_image<I>& in, + const oln_type_of(I, value)& min_in = + ntg_min_val(oln_type_of(I, value)), + const oln_type_of(I, value)& max_in = + ntg_max_val(oln_type_of(I, value)), + const DestValue& min_out = ntg_min_val(DestValue), + const DestValue& max_out = ntg_max_val(DestValue)) + { + ntg_is_a(DestValue, ntg::non_vectorial)::ensure(); + + typename ch_value_type<I, DestValue>::ret out(in.size()); + + //FIXME: I would like to remove the static_cast. + std::vector<ntg_cumul_type(DestValue)> + tab(static_cast<int>(max_in - min_in + 1)); + typedef typename std::set<oln_type_of(I, value)> set_type; + set_type s; + oln_type_of(I, piter) it(in.size()); + + for_all_p (it) + if (in[it] <= max_in && in[it] >= min_in) + s.insert(in[it]); + if (s.size() == 1) + { + for_all_p (it) + out[it] = ntg_zero_val(DestValue); + return out; + } + { + unsigned cpt = 0; + for (typename set_type::const_iterator it(s.begin()); + it != s.end(); ++it, ++cpt) + tab[*it - min_in] = cpt * (max_out - min_out) / (s.size() - 1); + } + for_all_p (it) + if (min_in <= in[it]) + { + if (in[it] <= max_in) + out[it] = tab[in[it].value() - min_in] + min_out; + else + out[it] = max_out; + } + else + out[it] = min_out; + return out; + } + + } // end of namespace oln::convert. + +} // end of namespace oln. + +#endif // OLENA_CONVERT_STRETCH_HH Index: olena/oln/makefile.src --- olena/oln/makefile.src (révision 226) +++ olena/oln/makefile.src (copie de travail) @@ -27,6 +27,7 @@ convert/abstract/conversion.hh \ convert/conversion.hh \ convert/force.hh \ + convert/stretch.hh \ convert/value_to_point.hh \ \ core/1d/array1d.hh \