Commit f327eb57 authored by Guillaume Lazzara's avatar Guillaume Lazzara

Add an example using make::graph.

	* doc/examples/ new example.

git-svn-id: 4aad255d-cdde-0310-9447-f3009e2ae8c0
parent b264e7a9
2008-11-19 Guillaume Lazzara <>
Add an example using make::graph.
* doc/examples/ new example.
2008-11-19 Guillaume Lazzara <> 2008-11-19 Guillaume Lazzara <>
Revamp labeling::compute. Revamp labeling::compute.
// Copyright (C) 2008 EPITA Research and Development Laboratory (LRDE)
// 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
// 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.
/// \file doc/examples/
/// This example shows how to create a graph from an influence zone image
# include <mln/essential/2d.hh>
# include <mln/core/site_set/p_vertices.hh>
# include <mln/core/site_set/p_edges.hh>
# include <mln/debug/colorize.hh>
# include <mln/debug/draw_graph.hh>
# include <mln/make/graph.hh>
# include <mln/transform/influence_zone_geodesic.hh>
# include <mln/util/graph.hh>
int main(int argc, char *argv[])
using namespace mln;
using value::int_u8;
if (argc < 2)
std::cout << "Usage: " << argv[0] << " <image.pbm>" << std::endl;
return 1;
image2d<bool> ima = io::pbm::load(argv[1]);
// Create a label image and compute the influence zones.
int_u8 nlabels;
image2d<int_u8> lbl = labeling::blobs(ima, c8(), nlabels);
io::ppm::save(debug::colorize< image2d<value::rgb8> >(lbl, nlabels),
image2d<int_u8> iz = transform::influence_zone_geodesic(lbl,
io::ppm::save(debug::colorize< image2d<value::rgb8> >(iz, nlabels),
/// Make a graph from the influence zone image.
util::graph g = make::graph(iz, nlabels);
// Use the center of each bbox component as vertex in the graph.
typedef fun::i2v::array<point2d> i2v_t;
util::array<point2d> centers = labeling::compute(accu::center<point2d>(), iz, nlabels);
i2v_t f = convert::to<i2v_t>(centers);
p_vertices<util::graph, i2v_t> pv(g, f);
// Find lines (sites) associated to edges.
typedef fun::i2v::array<p_line2d> i2e_t;
util::array<p_line2d> lines;
mln_edge_iter_(util::graph) e(g);
lines.append(p_line2d(f(e.v1()), f(e.v2())));
p_edges<util::graph, i2e_t> pe(g, convert::to<i2e_t>(lines));
// Draw graph.
image2d<value::rgb8> out(ima.domain());
debug::draw_graph(out, pv, literal::red, literal::green);
io::ppm::save(out, "3_graph.ppm");
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