gradient_external.cc

// Copyright (C) 2008, 2009 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.

#include <mln/core/image/image2d.hh>
#include <mln/core/image/dmorph/sub_image.hh>
#include <mln/core/alias/neighb2d.hh>
#include <mln/core/var.hh>
#include <mln/value/int_u8.hh>

#include <mln/debug/iota.hh>
#include <mln/debug/println.hh>

#include <mln/morpho/elementary/gradient_external.hh>


int main()
{
  using namespace mln;
  using value::int_u8;

  image2d<int_u8> ima(3, 3, 0);
  debug::iota(ima);

  {
    int_u8 ref_[9] = { 3, 3, 3,
                       3, 3, 3,
                       1, 1, 0 };
    image2d<int_u8> ref = make::image2d(ref_);

    image2d<int_u8> gra = morpho::elementary::gradient_external(ima, c4());
    mln_assertion(gra == ref);
  }

  {
    bool ref_[9] = { 0, 1, 1,
                     1, 0, 0,
                     0, 0, 0 };
    image2d<bool> ref = make::image2d(ref_);

    image2d<bool> msk(3, 3, 0);
    data::fill(msk, pw::value(ima) >= pw::cst(5u));
    image2d<bool> gra = morpho::elementary::gradient_external(msk, c4());
    mln_assertion(gra == ref);
  }

}