URL: https://svn.lrde.epita.fr/svn/oln/trunk/milena ChangeLog: 2008-03-22 Etienne FOLIO <folio@lrde.epita.fr> Chamfer DT with nearest point calculus. * chamfer.cc: Returns a pair containing the two maps. --- chamfer.cc | 189 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 189 insertions(+) Index: trunk/milena/sandbox/folio/chamfer.cc =================================================================== --- trunk/milena/sandbox/folio/chamfer.cc (revision 0) +++ trunk/milena/sandbox/folio/chamfer.cc (revision 1797) @@ -0,0 +1,189 @@ +// Copyright (C) 2007 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, 51 Franklin Street, Fifth Floor, +// 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 MLN_DT_CHAMFER_HH +# define MLN_DT_CHAMFER_HH + +# include <mln/core/concept/image.hh> +# include <mln/make/w_window.hh> + +namespace mln +{ + + namespace dt + { + + /*! Distance tranform by chamfer application. + * + * \param[in] input_ The input image. + * \param[in] chamfer The chamfer window to use for distance calcul. + * \return A pair (distance map, nearest point map). + * + * \pre \p img has to be initialized. + */ + template<typename I, typename T> + std::pair<mln_ch_value(I, T), mln_ch_value(I, mln_point(I))> + chamfer(const Image<I>& input_, + w_window<mln_dpoint(I), T> chamfer); + + +# ifndef MLN_INCLUDE_ONLY + + namespace impl + { + + /*! Computes a pass of the chamfer DT algorithm. + * + * \param[in] p Iterator on the input image to use. + * \param[in] chamfer The chamfer window to use for distance calcul. + * \param[in] input The input image. + * \param[out] outputDistance The distance map updated. + * \param[out] outputnearest The nearest points map updated. + */ + template<typename Q, typename I, typename T> + inline + void + chamfer_pass(const w_window<mln_dpoint(I), T> chamfer, + const I& input, + mln_ch_value(I, T)& outputDistance, + mln_ch_value(I, mln_point(I))& outputNearest) + { + typedef w_window<mln_dpoint(I), T> W; + + Q p(input.domain()); + mln_qiter(W) q(chamfer, p); + for_all(p) + { + std::pair<T, mln_point(I)> min(mln_max(T), p); + + for_all(q) + if (input.has(q) && outputDistance(q) != mln_max(T)) + { + T v = outputDistance(q) + q.w(); + + if (v < min.first) + { + min.first = v; + min.second = outputNearest(q); + } + } + + if (min.first < outputDistance(p)) + { + outputDistance(p) = min.first; + outputNearest(p) = min.second; + } + } + } + + } // end of namespace mln::dt::impl + + + + // Facade. + + template<typename I, typename T> + inline + std::pair<mln_ch_value(I, T), mln_ch_value(I, mln_point(I))> + chamfer(const Image<I>& input_, + w_window<mln_dpoint(I), T> chamfer) + { + typedef w_window<mln_dpoint(I), T> W; + + const I& input = exact(input_); + mln_precondition(input.has_data()); + + mln_ch_value(I, T) outputDistance; + initialize(outputDistance, input); + + mln_ch_value(I, mln_point(I)) outputNearest; + initialize(outputNearest, input); + + // Initialization. + { + mln_fwd_piter(I) p(input.domain()); + for_all(p) + { + outputDistance(p) = input(p) ? literal::zero : mln_max(T); + outputNearest(p) = p; + } + } + + // First pass. + impl::chamfer_pass<mln_fwd_piter(I)> + (chamfer, input, outputDistance, outputNearest); + + chamfer.sym(); + + // Second pass. + impl::chamfer_pass<mln_bkd_piter(I)> + (chamfer, input, outputDistance, outputNearest); + + return std::pair<mln_ch_value(I, T), mln_ch_value(I, mln_point(I))> + (outputDistance, outputNearest); + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace mln::dt + +} // end of namespace mln + +#endif // ! MLN_DT_CHAMFER_HH + +#include <iostream> +#include <mln/debug/println.hh> +#include <mln/core/image2d.hh> +#include <mln/make/win_chamfer.hh> +#include <mln/level/fill.hh> + +int main() +{ + using namespace mln; + + w_window2d_int chamfer = make::mk_chamfer_3x3_int<3, 4>(); + + { + image2d<bool> ima(5,5); + bool vals[] = { 1, 1, 1, 0, 0, + 0, 0, 1, 0, 0, + 0, 0, 1, 0, 0, + 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0 }; + + level::fill(ima, vals); + debug::println(ima); + + std::pair<image2d<int>, image2d<mln_point_(image2d<bool>)> > + out = dt::chamfer(ima, chamfer); + + std::cerr << "Distance:" << std::endl; + debug::println(out.first); + std::cerr << "PPP:" << std::endl; + debug::println(out.second); + } +}