* scribo/layout/internal/smearing/bbox2d.hh, * scribo/layout/internal/smearing/classification.hh, * scribo/layout/internal/smearing/crla.hh, * scribo/layout/internal/smearing/draw_region.hh, * scribo/layout/internal/smearing/labeling.hh, * scribo/layout/smearing.hh, * tests/layout/smearing-nontext.pbm, * tests/layout/smearing-text.pbm, * tests/layout/smearing.cc: New. * tests/layout/Makefile.am: New target. --- scribo/ChangeLog | 16 + scribo/scribo/layout/internal/smearing/bbox2d.hh | 151 +++++++++ .../layout/internal/smearing/classification.hh | 147 +++++++++ scribo/scribo/layout/internal/smearing/crla.hh | 219 +++++++++++++ .../scribo/layout/internal/smearing/draw_region.hh | 121 +++++++ scribo/scribo/layout/internal/smearing/labeling.hh | 340 ++++++++++++++++++++ scribo/scribo/layout/smearing.hh | 223 +++++++++++++ scribo/tests/layout/Makefile.am | 10 +- scribo/tests/layout/smearing-nontext.pbm | 5 + .../alignment_3.pbm => layout/smearing-text.pbm} | Bin 12167 -> 11996 bytes scribo/tests/layout/{xy_cut.cc => smearing.cc} | 19 +- 11 files changed, 1240 insertions(+), 11 deletions(-) create mode 100644 scribo/scribo/layout/internal/smearing/bbox2d.hh create mode 100644 scribo/scribo/layout/internal/smearing/classification.hh create mode 100644 scribo/scribo/layout/internal/smearing/crla.hh create mode 100644 scribo/scribo/layout/internal/smearing/draw_region.hh create mode 100644 scribo/scribo/layout/internal/smearing/labeling.hh create mode 100644 scribo/scribo/layout/smearing.hh create mode 100644 scribo/tests/layout/smearing-nontext.pbm copy scribo/tests/{img/alignment_3.pbm => layout/smearing-text.pbm} (95%) copy scribo/tests/layout/{xy_cut.cc => smearing.cc} (78%) diff --git a/scribo/ChangeLog b/scribo/ChangeLog index 90de65c..b10317a 100644 --- a/scribo/ChangeLog +++ b/scribo/ChangeLog @@ -1,3 +1,19 @@ +2013-05-13 Guillaume Lazzara <z@lrde.epita.fr> + + Add Smearing layout analysis algorithm. + + * scribo/layout/internal/smearing/bbox2d.hh, + * scribo/layout/internal/smearing/classification.hh, + * scribo/layout/internal/smearing/crla.hh, + * scribo/layout/internal/smearing/draw_region.hh, + * scribo/layout/internal/smearing/labeling.hh, + * scribo/layout/smearing.hh, + * tests/layout/smearing-nontext.pbm, + * tests/layout/smearing-text.pbm, + * tests/layout/smearing.cc: New. + + * tests/layout/Makefile.am: New target. + 2013-04-26 Guillaume Lazzara <z@lrde.epita.fr> * scribo/binarization/sauvola_ms_split.hh: Make use of all arguments. diff --git a/scribo/scribo/layout/internal/smearing/bbox2d.hh b/scribo/scribo/layout/internal/smearing/bbox2d.hh new file mode 100644 index 0000000..502e279 --- /dev/null +++ b/scribo/scribo/layout/internal/smearing/bbox2d.hh @@ -0,0 +1,151 @@ +// 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. + +/// \file +/// +/// \brief 2D box class used in Smearing algorithm. + +/// FIXME: Use box2d ? + +#ifndef SCRIBO_LAYOUT_INTERNAL_SMEARING_BBOX2D_HH +# define SCRIBO_LAYOUT_INTERNAL_SMEARING_BBOX2D_HH + +# include <mln/core/alias/point2d.hh> + +namespace scribo +{ + + namespace layout + { + + namespace internal + { + + namespace smearing + { + + using namespace mln; + + //--------------------------- + // Bounding box 2D + //--------------------------- + + class bbox2d + { + public: + bbox2d(); + + bbox2d(const unsigned n, + const point2d& pmin, + const point2d& pmax); + + point2d& pmin(); + const point2d& pmin() const; + + point2d& pmax(); + const point2d& pmax() const; + + point2d pcenter() const; + + unsigned bbox_number() const; + + private: + unsigned n_; + point2d pmin_; + point2d pmax_; + }; + +# ifndef MLN_INCLUDE_ONLY + + inline + bbox2d::bbox2d() + : n_(0), pmin_(point2d(0, 0)), pmax_(point2d(0, 0)) + { + } + + inline + bbox2d::bbox2d(const unsigned n, + const point2d& pmin, + const point2d& pmax) + : n_(n), pmin_(pmin), pmax_(pmax) + { + } + + inline + point2d& + bbox2d::pmin() + { + return pmin_; + } + + inline + const point2d& + bbox2d::pmin() const + { + return pmin_; + } + + inline + point2d& + bbox2d::pmax() + { + return pmax_; + } + + inline + const point2d& + bbox2d::pmax() const + { + return pmax_; + } + + inline + point2d + bbox2d::pcenter() const + { + point2d p(pmin_.row() + (pmax_.row() - pmin_.row()) / 2, + pmin_.col() + (pmax_.col() - pmin_.col()) / 2); + + return p; + } + + inline + unsigned + bbox2d::bbox_number() const + { + return n_; + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace scribo::layout::internal::smearing + + } // end of namespace scribo::layout::internal + + } // end of namespace scribo::layout + +} // end of namespace scribo + +#endif // ! SCRIBO_LAYOUT_INTERNAL_SMEARING_BBOX2D_HH diff --git a/scribo/scribo/layout/internal/smearing/classification.hh b/scribo/scribo/layout/internal/smearing/classification.hh new file mode 100644 index 0000000..32c2405 --- /dev/null +++ b/scribo/scribo/layout/internal/smearing/classification.hh @@ -0,0 +1,147 @@ +// 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. + +/// \file +/// +/// \brief Routines used in scribo::layout::smearing + +#ifndef SCRIBO_LAYOUT_INTERNAL_SMEARING_CLASSIFICATION_HH +# define SCRIBO_LAYOUT_INTERNAL_SMEARING_CLASSIFICATION_HH + +# include <mln/core/image/image2d.hh> +# include <scribo/layout/internal/smearing/bbox2d.hh> + + +namespace scribo +{ + + namespace layout + { + + namespace internal + { + + namespace smearing + { + + using namespace mln; + + + template<typename V> + void classify_component(const bbox2d& bbox, + V label, + image2d<V>& labeled_img); + + template<typename V> + void compute_region_info(const image2d<bool>& input, + const image2d<V>& labeled_img, + const bbox2d& bbox, + float& brl, + float& tc); + + +# ifndef MLN_INCLUDE_ONLY + + //--------------------------- + // Classify component + //--------------------------- + + template<typename V> + inline + void classify_component(const bbox2d& bbox, + V label, + image2d<V>& labeled_img) + { + const unsigned id = bbox.bbox_number(); + const point2d& pmin = bbox.pmin(); + const point2d& pmax = bbox.pmax(); + box2d b(pmin, pmax); + mln_piter_(box2d) p(b); + + for_all(p) + { + V& pixel = labeled_img(p); + if (pixel == id) + pixel = label; + } + } + + //--------------------------- + // Compute region information + //--------------------------- + + template<typename V> + inline + void compute_region_info(const image2d<bool>& input, + const image2d<V>& labeled_img, + const bbox2d& bbox, + float& brl, + float& tc) + { + const unsigned id = bbox.bbox_number(); + const point2d& pmin = bbox.pmin(); + const point2d& pmax = bbox.pmax(); + + for (int i = pmin.row(); i <= pmax.row(); ++i) + { + for (int j = pmin.col(); j <= pmax.col(); ++j) + { + const unsigned label_pixel = labeled_img.at_(i, j); + + if (label_pixel == id) + { + const bool pixel = input.at_(i, j); + + if (pixel) + { + if (j > 0 && input.at_(i, j - 1) == 0) + ++tc; + + int k = j + 1; + for (; input.at_(i, k); ++k); + brl += (k - j); + + j = k; + } + } + } + } + + if (tc == 0.0f) + tc = 1.0f; + } + + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace scribo::layout::internal::smearing + + } // end of namespace scribo::layout::internal + + } // end of namespace scribo::layout + +} // end of namespace scribo + +#endif // ! SCRIBO_LAYOUT_INTERNAL_SMEARING_CLASSIFICATION_HH diff --git a/scribo/scribo/layout/internal/smearing/crla.hh b/scribo/scribo/layout/internal/smearing/crla.hh new file mode 100644 index 0000000..431ed79 --- /dev/null +++ b/scribo/scribo/layout/internal/smearing/crla.hh @@ -0,0 +1,219 @@ +// 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. + +/// \file +/// +/// \brief Routines used in scribo::layout::smearing + +#ifndef SCRIBO_LAYOUT_INTERNAL_SMEARING_CRLA_HH +# define SCRIBO_LAYOUT_INTERNAL_SMEARING_CRLA_HH + +#include <mln/core/image/image2d.hh> +#include <mln/pw/all.hh> +#include <mln/core/image/dmorph/image_if.hh> + + +namespace scribo +{ + + namespace layout + { + + namespace internal + { + + namespace smearing + { + + + using namespace mln; + + + template< typename V > + void horizontal_CRLA(const image2d<V>& input, + image2d<V>& output, + const unsigned threshold, + const V bound); + + template< typename V > + void vertical_CRLA(const image2d<V>& input, + image2d<V>& output, + const unsigned threshold, + const V bound); + + template< typename V > + void CRLA(const image2d<V>& input, + image2d<V>& output, + const unsigned hthreshold, + const unsigned hthreshold2, + const unsigned vthreshold, + const V bound); + + +# ifndef MLN_INCLUDE_ONLY + + //--------------------------- + // Horizontal CRLA + //--------------------------- + + template< typename V > + inline + void horizontal_CRLA(const image2d<V>& input, + image2d<V>& output, + const unsigned threshold, + const V bound) + { + unsigned count = 0; + unsigned nrows = input.nrows(); + unsigned ncols = input.ncols(); + V last_pixel_value = 0; + + for (unsigned i = 0; i < nrows; ++i) + { + for (unsigned j = 0; j < ncols; ++j) + { + V current_pixel = input.at_(i, j); + + if (current_pixel == 0) + { + if (last_pixel_value) + { + unsigned k = j + 1; + for (; input.at_(i, k) == 0 && (k < ncols); ++k); + + count = k - j; + current_pixel = input.at_(i, k); + + if (last_pixel_value == current_pixel && + current_pixel <= bound && + count < threshold) + for (unsigned l = j; l <= k; ++l) + output.at_(i, l) = last_pixel_value; + + j = k; + output.at_(i, j) = current_pixel; + last_pixel_value = current_pixel; + } + } + else + { + output.at_(i, j) = current_pixel; + last_pixel_value = current_pixel; + } + } + } + } + + //--------------------------- + // Vertical CRLA + //--------------------------- + + template< typename V > + inline + void vertical_CRLA(const image2d<V>& input, + image2d<V>& output, + const unsigned threshold, + const V bound) + { + unsigned count = 0; + unsigned nrows = input.nrows(); + unsigned ncols = input.ncols(); + V last_pixel_value = 0; + + for (unsigned j = 0; j < ncols; ++j) + { + for (unsigned i = 0; i < nrows; ++i) + { + V current_pixel = input.at_(i, j); + + if (current_pixel == 0) + { + if (last_pixel_value) + { + unsigned k = i + 1; + for (; !input.at_(k, j) && (k < nrows); ++k); + + count = k - i; + current_pixel = input.at_(k, j); + + if (last_pixel_value == current_pixel && + current_pixel <= bound && + count < threshold) + for (unsigned l = i; l <= k; ++l) + output.at_(l, j) = last_pixel_value; + + i = k; + output.at_(i, j) = current_pixel; + last_pixel_value = current_pixel; + } + } + else + { + output.at_(i, j) = current_pixel; + last_pixel_value = current_pixel; + } + } + } + } + + //--------------------------- + // CRLA + //--------------------------- + + template< typename V > + inline + void CRLA(const image2d<V>& input, + image2d<V>& output, + const unsigned hthreshold, + const unsigned hthreshold2, + const unsigned vthreshold, + const V bound) + { + const box2d& domain = input.domain(); + image2d<V> himg(domain); + image2d<V> vimg(domain); + data::fill(himg, 0); + data::fill(vimg, 0); + + horizontal_CRLA(input, himg, hthreshold, bound); + vertical_CRLA(input, vimg, vthreshold, bound); + + data::fill((output |(pw::value(himg) == pw::value(vimg))).rw(), pw::value(himg)); + + horizontal_CRLA(output, output, hthreshold2, bound); + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace scribo::layout::internal::smearing + + } // end of namespace scribo::layout::internal + + } // end of namespace scribo::layout + +} // end of namespace scribo + +#endif // ! SCRIBO_LAYOUT_INTERNAL_SMEARING_CRLA_HH + diff --git a/scribo/scribo/layout/internal/smearing/draw_region.hh b/scribo/scribo/layout/internal/smearing/draw_region.hh new file mode 100644 index 0000000..ec1a415 --- /dev/null +++ b/scribo/scribo/layout/internal/smearing/draw_region.hh @@ -0,0 +1,121 @@ +// 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. + +/// \file +/// +/// \brief Routines used in scribo::layout::smearing + +#ifndef SCRIBO_LAYOUT_INTERNAL_SMEARING_DRAW_REGION_HH +# define SCRIBO_LAYOUT_INTERNAL_SMEARING_DRAW_REGION_HH + +# include <mln/core/image/image2d.hh> +# include <scribo/layout/internal/smearing/bbox2d.hh> + + +namespace scribo +{ + + namespace layout + { + + namespace internal + { + + namespace smearing + { + + using namespace mln; + + + template< typename V > + void remove_text_region(const bbox2d& bbox, + const image2d<bool>& input, + image2d<bool>& output, + image2d<V>& labeled_img_orig, + const image2d<V>& labeled_img); + + template< typename V > + void draw_region(const bbox2d& bbox, + const image2d<bool>& input, + image2d<bool>& output, + image2d<V>& labeled_img); + +# ifndef MLN_INCLUDE_ONLY + + template< typename V > + void remove_text_region(const bbox2d& bbox, + const image2d<bool>& input, + image2d<bool>& output, + image2d<V>& labeled_img_orig, + const image2d<V>& labeled_img) + { + const unsigned id = bbox.bbox_number(); + box2d b(bbox.pmin(), bbox.pmax()); + mln_piter_(box2d) p(b); + + for_all(p) + { + const bool pixel = input(p); + const V label_pixel = labeled_img(p); + + if (pixel && label_pixel == id) + { + output(p) = true; + labeled_img_orig(p) = 0; + } + } + } + + template< typename V > + void draw_region(const bbox2d& bbox, + const image2d<bool>& input, + image2d<bool>& output, + image2d<V>& labeled_img) + { + const unsigned id = bbox.bbox_number(); + box2d b(bbox.pmin(), bbox.pmax()); + mln_piter_(box2d) p(b); + + for_all(p) + { + const bool pixel = input(p); + const V label_pixel = labeled_img(p); + + if (pixel && label_pixel == id) + output(p) = true; + } + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace scribo::layout::internal::smearing + + } // end of namespace scribo::layout::internal + + } // end of namespace scribo::layout + +} // end of namespace scribo + +#endif // ! SCRIBO_LAYOUT_INTERNAL_SMEARING_DRAW_REGION_HH diff --git a/scribo/scribo/layout/internal/smearing/labeling.hh b/scribo/scribo/layout/internal/smearing/labeling.hh new file mode 100644 index 0000000..bc55741 --- /dev/null +++ b/scribo/scribo/layout/internal/smearing/labeling.hh @@ -0,0 +1,340 @@ +// 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. + +/// \file +/// +/// \brief Routines used in scribo::layout::smearing + +#ifndef SCRIBO_LAYOUT_INTERNAL_SMEARING_LABELING_HH +# define SCRIBO_LAYOUT_INTERNAL_SMEARING_LABELING_HH + +#include <mln/core/image/image2d.hh> +#include <scribo/layout/internal/smearing/bbox2d.hh> + + +namespace scribo +{ + + namespace layout + { + + namespace internal + { + + namespace smearing + { + + + using namespace mln; + + struct labeling_position + { + labeling_position(const int x_, const int y_); + int x; + int y; + }; + + + template< typename V > + void propagate(const labeling_position& position, + std::vector< labeling_position >& next_position_list, + const image2d<V>& input, image2d<unsigned>& labeled_image, + const unsigned nb_labels, bbox2d& bbox, const V value); + + + template< typename V > + void component_labeling(const image2d<V>& input, + unsigned& nb_labels, + std::vector<bbox2d>& bbox_list, + image2d<unsigned>& labeled_image, + const V bound); + + +# ifndef MLN_INCLUDE_ONLY + + + //--------------------------- + // Labeling position + //--------------------------- + + labeling_position::labeling_position(const int x_, const int y_) + : x(x_), + y(y_) + { + } + + //--------------------------- + // Propagate labeling + //--------------------------- + + template< typename V > + inline + void propagate(const labeling_position& position, + std::vector< labeling_position >& next_position_list, + const image2d<V>& input, image2d<unsigned>& labeled_image, + const unsigned nb_labels, bbox2d& bbox, const V value) + { + int x = position.x; + int y = position.y; + int nx; + int ny; + int ncols = input.ncols(); + int nrows = input.nrows(); + + bool increment_xlr = false; + bool increment_ylr = false; + bool decrement_xul = false; + bool decrement_yul = false; + + point2d& pmin = bbox.pmin(); + point2d& pmax = bbox.pmax(); + const int xul = pmin.col(); + const int yul = pmin.row(); + const int xlr = pmax.col(); + const int ylr = pmax.row(); + + { + nx = x + 1; + + if (nx < ncols) + { + unsigned& pixel = labeled_image.at_(y, nx); + if (input.at_(y, nx) == value && !pixel) + { + if (xlr < nx) + increment_xlr = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(nx, y)); + } + } + } + + { + nx = x + 1; + ny = y + 1; + + if (nx < ncols && ny < nrows) + { + unsigned& pixel = labeled_image.at_(ny, nx); + if (input.at_(ny, nx) == value && !pixel) + { + if (xlr < nx) + increment_xlr = true; + if (ylr < ny) + increment_ylr = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(nx, ny)); + } + } + } + + { + ny = y + 1; + + if (ny < nrows) + { + unsigned& pixel = labeled_image.at_(ny, x); + if (input.at_(ny, x) == value && !pixel) + { + if (ylr < ny) + increment_ylr = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(x, ny)); + } + } + } + + { + nx = x - 1; + ny = y + 1; + + if (nx >= 0 && ny < nrows) + { + unsigned& pixel = labeled_image.at_(ny, nx); + if (input.at_(ny, nx) == value && !pixel) + { + if (xul > nx) + decrement_xul = true; + if (ylr < ny) + increment_ylr = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(nx, ny)); + } + } + } + + { + nx = x - 1; + + if (nx >= 0) + { + unsigned& pixel = labeled_image.at_(y, nx); + if (input.at_(y, nx) == value && !pixel) + { + if (xul > nx) + decrement_xul = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(nx, y)); + } + } + } + + { + nx = x - 1; + ny = y - 1; + + if (nx >= 0 && ny >= 0) + { + unsigned& pixel = labeled_image.at_(ny, nx); + if (input.at_(ny, nx) == value && !pixel) + { + if (xul > nx) + decrement_xul = true; + if (yul > ny) + decrement_yul = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(nx, ny)); + } + } + } + + { + ny = y - 1; + + if (ny >= 0) + { + unsigned& pixel = labeled_image.at_(ny, x); + if (input.at_(ny, x) == value && !pixel) + { + if (yul > ny) + decrement_yul = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(x, ny)); + } + } + } + + { + nx = x + 1; + ny = y - 1; + + if (nx < ncols && ny >= 0) + { + unsigned& pixel = labeled_image.at_(ny, nx); + if (input.at_(ny, nx) == value && !pixel) + { + if (xlr < nx) + increment_xlr = true; + if (yul > ny) + decrement_yul = true; + pixel = nb_labels; + next_position_list.push_back(labeling_position(nx, ny)); + } + } + } + + if (increment_xlr) + ++pmax.col(); + if (increment_ylr) + ++pmax.row(); + if (decrement_xul) + --pmin.col(); + if (decrement_yul) + --pmin.row(); + } + + //--------------------------- + // Component labeling + //--------------------------- + + template< typename V > + inline + void component_labeling(const image2d<V>& input, + unsigned& nb_labels, + std::vector<bbox2d>& bbox_list, + image2d<unsigned>& labeled_image, + const V bound) + { + std::vector<labeling_position> position_list; + std::vector<labeling_position> next_position_list; + unsigned nrows = input.nrows(); + unsigned ncols = input.ncols(); + + next_position_list.reserve(8); + + for (unsigned i = 0; i < nrows; ++i) + { + for (unsigned j = 0; j < ncols; ++j) + { + if (input.at_(i, j) && !labeled_image.at_(i, j)) + { + V value = input.at_(i, j); + + if (value <= bound) + { + ++nb_labels; + position_list.clear(); + position_list.push_back(labeling_position(j, i)); + + labeled_image.at_(i, j) = nb_labels; + + point2d p(i, j); + bbox2d bbox(nb_labels, p, p); + + while (!position_list.empty()) + { + unsigned nb_positions = position_list.size(); + next_position_list.clear(); + + for (unsigned k = 0; k < nb_positions; ++k) + { + const labeling_position& position = position_list[k]; + + propagate(position, next_position_list, input, + labeled_image, nb_labels, bbox, value); + } + + position_list.clear(); + position_list = next_position_list; + } + + bbox_list.push_back(bbox); + } + } + } + } + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace scribo::layout::internal::smearing + + } // end of namespace scribo::layout::internal + + } // end of namespace scribo::layout + +} // end of namespace scribo + +#endif // ! SCRIBO_LAYOUT_INTERNAL_SMEARING_LABELING_HH diff --git a/scribo/scribo/layout/smearing.hh b/scribo/scribo/layout/smearing.hh new file mode 100644 index 0000000..2574876 --- /dev/null +++ b/scribo/scribo/layout/smearing.hh @@ -0,0 +1,223 @@ +// 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. + +/// \file +/// +/// \brief Smearing layout analysis algorithm. + +#ifndef SCRIBO_LAYOUT_SMEARING_HH +# define SCRIBO_LAYOUT_SMEARING_HH + +# include <mln/core/image/image2d.hh> +# include <mln/util/couple.hh> + +# include <scribo/layout/internal/smearing/crla.hh> +# include <scribo/layout/internal/smearing/labeling.hh> +# include <scribo/layout/internal/smearing/classification.hh> +# include <scribo/layout/internal/smearing/draw_region.hh> + + +namespace scribo +{ + + namespace layout + { + + using namespace mln; + + /*! \brief The Smearing layout analysis algorithm. This algorithm + is an implementation according to paper \cite ogorman1993pami. + + \param[in] A binary image. + + \return A couple of binary images. The first one contains the + text components and the second one the non-text components. + + \ingroup grpalgolayout + */ + template <typename I> + util::couple<mln_concrete(I), mln_concrete(I)> + smearing(const Image<I>& input); + + +# ifndef MLN_INCLUDE_ONLY + + template <typename I> + util::couple<mln_concrete(I), mln_concrete(I)> + smearing(const Image<I>& input_) + { + mln_trace("scribo::layout::smearing"); + + using namespace internal::smearing; + + typedef mln_value(I) V; + mlc_is(V,bool)::check(); + + const I& input = exact(input_); + mln_precondition(input.is_valid()); + + //------------------------- + // Initialization + //------------------------- + + const box2d& domain = input.domain(); + image2d<bool> output_text(domain); + image2d<bool> output_non_text(domain); + data::fill(output_text, false); + data::fill(output_non_text, false); + + + //------------------------- + // Component labeling + //------------------------- + + std::vector<bbox2d> bbox_list; + image2d<unsigned> labeled_img(domain); + data::fill(labeled_img, 0); + unsigned nlabels = 0; + + internal::smearing::component_labeling(input, nlabels, + bbox_list, labeled_img, true); + + //------------------------- + // Classification + //------------------------- + + std::vector<bbox2d>::iterator it_begin = bbox_list.begin(); + std::vector<bbox2d>::iterator it_end = bbox_list.end(); + + for (; it_begin != it_end; ++it_begin) + { + const bbox2d& bbox = (*it_begin); + const unsigned height = bbox.pmax().row() - bbox.pmin().row(); + unsigned c = 0; + + if (height < 120) + c = 1; + else if (height >= 120 && height < 360) + c = 2; + else + c = 3; + + internal::smearing::classify_component(bbox, c, labeled_img); + } + + //------------------------- + // First pass + //------------------------- + + { + image2d<unsigned> output_CRLA(domain); + data::fill(output_CRLA, 0); + const unsigned bound = 1; + + internal::smearing::CRLA(labeled_img, output_CRLA, 360, 15, 360, bound); + + image2d<unsigned> f_labeled_img(domain); + data::fill(f_labeled_img, 0); + nlabels = 0; + bbox_list.clear(); + + internal::smearing::component_labeling(output_CRLA, nlabels, + bbox_list, f_labeled_img, + bound); + + it_begin = bbox_list.begin(); + it_end = bbox_list.end(); + + for (; it_begin != it_end; ++it_begin) + { + float brl = 0.0f; + float tc = 0.0f; + const bbox2d& bbox = (*it_begin); + const unsigned width = bbox.pmax().col() - bbox.pmin().col(); + + internal::smearing::compute_region_info(input, f_labeled_img, + bbox, brl, tc); + + const float mbrl = brl / tc; + const float mtc = tc / width; + + if (mbrl >= 0.4f && mbrl <= 15.0f && mtc >= 1.0f && mtc <= 3.8f) + internal::smearing::remove_text_region(bbox, input, output_text, + labeled_img, f_labeled_img); + } + } + + //------------------------- + // Second pass + //------------------------- + + { + image2d<unsigned> output_CRLA(domain); + data::fill(output_CRLA, 0); + const unsigned bound = 2; + + internal::smearing::CRLA(labeled_img, output_CRLA, 360, 60, 360, bound); + + image2d<unsigned> s_labeled_img(domain); + data::fill(s_labeled_img, 0); + nlabels = 0; + bbox_list.clear(); + + internal::smearing::component_labeling(output_CRLA, nlabels, + bbox_list, s_labeled_img, + bound); + + it_begin = bbox_list.begin(); + it_end = bbox_list.end(); + + for (; it_begin != it_end; ++it_begin) + { + float brl = 0.0f; + float tc = 0.0f; + const bbox2d& bbox = (*it_begin); + const unsigned width = bbox.pmax().col() - bbox.pmin().col(); + + internal::smearing::compute_region_info(input, s_labeled_img, + bbox, brl, tc); + + const float mbrl = brl / tc; + const float mtc = tc / width; + + if (mbrl >= 2.2f && mbrl <= 45.0f && mtc >= 1.2f && mtc <= 9.0f) + internal::smearing::draw_region(bbox, input, output_text, + s_labeled_img); + else + internal::smearing::draw_region(bbox, input, output_non_text, + s_labeled_img); + } + } + + return mln::make::couple(output_text, output_non_text); + } + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace scribo::layout + +} // end of namespace scribo + +#endif // ! SCRIBO_LAYOUT_SMEARING_HH diff --git a/scribo/tests/layout/Makefile.am b/scribo/tests/layout/Makefile.am index 09990b1..0eab5d5 100644 --- a/scribo/tests/layout/Makefile.am +++ b/scribo/tests/layout/Makefile.am @@ -1,5 +1,4 @@ -# Copyright (C) 2013 EPITA Research and Development -# Laboratory (LRDE). +# Copyright (C) 2013 EPITA Research and Development Laboratory (LRDE). # # This file is part of Olena. # @@ -17,6 +16,11 @@ include $(top_srcdir)/scribo/tests/tests.mk -check_PROGRAMS = xy_cut +check_PROGRAMS = smearing \ + xy_cut + + +EXTRA_DIST = smearing-nontext.pbm \ + smearing-text.pbm TESTS = $(check_PROGRAMS) diff --git a/scribo/tests/layout/smearing-nontext.pbm b/scribo/tests/layout/smearing-nontext.pbm new file mode 100644 index 0000000..0bffbcf --- /dev/null +++ b/scribo/tests/layout/smearing-nontext.pbm @@ -0,0 +1,5 @@ +P4 +# Generated by Milena 1.0 http://olena.lrde.epita.fr +# EPITA Research and Development Laboratory (LRDE) +436 216 +ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿðÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿðÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿüÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿðÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿü
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\ No newline at end of file diff --git a/scribo/tests/img/alignment_3.pbm b/scribo/tests/layout/smearing-text.pbm similarity index 95% copy from scribo/tests/img/alignment_3.pbm copy to scribo/tests/layout/smearing-text.pbm index 89ec978..1975c01 100644 Binary files a/scribo/tests/img/alignment_3.pbm and b/scribo/tests/layout/smearing-text.pbm differ diff --git a/scribo/tests/layout/xy_cut.cc b/scribo/tests/layout/smearing.cc similarity index 78% copy from scribo/tests/layout/xy_cut.cc copy to scribo/tests/layout/smearing.cc index 3601d64..d5185db 100644 --- a/scribo/tests/layout/xy_cut.cc +++ b/scribo/tests/layout/smearing.cc @@ -28,22 +28,25 @@ #include <iostream> #include <mln/io/pbm/load.hh> #include <mln/make/box2d.hh> -#include <scribo/layout/xy_cut.hh> +#include <mln/data/compare.hh> +#include <scribo/layout/smearing.hh> #include "tests/data.hh" using namespace mln; -int main(int argc, char** argv) +int main() { image2d<bool> input; io::pbm::load(input, SCRIBO_IMG_DIR "/alignment_3.pbm"); - util::array<box2d> bb = scribo::layout::xy_cut(input, 10, 10); + util::couple<image2d<bool>, image2d<bool> > + res = scribo::layout::smearing(input); - mln_assertion(bb.nelements() == 4); - mln_assertion(bb[0] == make::box2d(20,66, 38,140)); - mln_assertion(bb[1] == make::box2d(11,171, 38,221)); - mln_assertion(bb[2] == make::box2d(0,237, 38,384)); - mln_assertion(bb[3] == make::box2d(50,60, 215,402)); + image2d<bool> ref1, ref2; + io::pbm::load(ref1, SCRIBO_TESTS_DIR "/layout/smearing-text.pbm"); + io::pbm::load(ref2, SCRIBO_TESTS_DIR "/layout/smearing-nontext.pbm"); + + mln_assertion(ref1 == res.first()); + mln_assertion(ref2 == res.second()); } -- 1.7.2.5