--- milena/mln/data/stretch_inplace.hh | 133 ++++++++++++++++++++++++++++++++++++ 1 files changed, 133 insertions(+), 0 deletions(-) create mode 100644 milena/mln/data/stretch_inplace.hh diff --git a/milena/mln/data/stretch_inplace.hh b/milena/mln/data/stretch_inplace.hh new file mode 100644 index 0000000..618f43d --- /dev/null +++ b/milena/mln/data/stretch_inplace.hh @@ -0,0 +1,133 @@ +// Copyright (C) 2013 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 +// executable file might be covered by the GNU General Public License. + +#ifndef MLN_DATA_STRETCH_INPLACE_HH +# define MLN_DATA_STRETCH_INPLACE_HH + +/// \file +/// +/// Transform linearly the contents of an image into another one in a +/// stretching way. +/// +/// \todo Make it work with other types than scalars (e.g., vectors). + + +# include <mln/estim/min_max.hh> +# include <mln/value/int_u.hh> +# include <mln/fun/v2v/linear.hh> +# include <mln/data/transform_inplace.hh> + + +# include <mln/value/internal/encoding.hh> +# include <iomanip> +namespace mln +{ + + namespace data + { + + /*! \brief Stretch the values of \p ima so that they can be + * stored inplace. + * + * \param[in,out] ima The input image. + * + * + * \pre input.is_valid + * + * \ingroup mlndata + */ + template <typename I> + void + stretch_inplace(Image<I>& ima); + + /*! \brief Stretch the values of \p ima so that they can be + * stored inplace. + * + * \param[in,out] ima The input image. + * \param[out] stretched The image has changed. + * + * \pre input.is_valid + * + * \ingroup mlndata + */ + template <typename I> + void + stretch_inplace(Image<I>& ima, bool& stretched); + + +# ifndef MLN_INCLUDE_ONLY + + + template <typename I> + inline + void + stretch_inplace(Image<I>& ima, bool& stretched) + { + mln_trace("data::stretch_inplace"); + typedef mln_value(I) V; + mln_precondition(exact(ima).is_valid()); + + V min_, max_; + estim::min_max(ima, min_, max_); + if (max_ != min_ && (mln_max(V)>max_ || mln_min(V)>min_)) + { + //FIXME: we would like to use float instead of double but we + //can't for precision reasons. See ticket #179. + double + min = double(min_), + max = double(max_), + epsilon = mln_epsilon(float), + M = mln_max(V) + 0.5f - epsilon, + m = 0.0f - 0.5f + epsilon, + a = (M - m) / (max - min), + b = (m * max - M * min) / (max - min); + fun::v2v::linear_sat<V, double, V> f(a, b); + data::transform_inplace(input, f); + stretched = true; + } + else + { + stretched = false; + mln_trace_warning("output has no significative data!"); + } + } + + template <typename I> + void + stretch_inplace(Image<I>& ima) + { + bool b; + stretch_inplace(ima, b); + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace mln::data + +} // end of namespace mln + + +#endif // ! MLN_DATA_STRETCH_INPLACE_HH -- 1.7.2.5