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Olena  User documentation 2.1
An Image Processing Platform
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preprocess.cc
1 // Copyright (C) 2009, 2010 EPITA Research and Development Laboratory
2 // (LRDE)
3 //
4 // This file is part of Olena.
5 //
6 // Olena is free software: you can redistribute it and/or modify it under
7 // the terms of the GNU General Public License as published by the Free
8 // Software Foundation, version 2 of the License.
9 //
10 // Olena is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with Olena. If not, see <http://www.gnu.org/licenses/>.
17 //
18 // As a special exception, you may use this file as part of a free
19 // software project without restriction. Specifically, if other files
20 // instantiate templates or use macros or inline functions from this
21 // file, or you compile this file and link it with other files to produce
22 // an executable, this file does not by itself cause the resulting
23 // executable to be covered by the GNU General Public License. This
24 // exception does not however invalidate any other reasons why the
25 // executable file might be covered by the GNU General Public License.
26 
27 #include <mln/core/image/image2d.hh>
28 
29 #include <mln/data/convert.hh>
30 
31 #include <mln/value/int_u8.hh>
32 #include <mln/value/label_16.hh>
33 
34 #include <mln/io/pgm/load.hh>
35 #include <mln/io/pbm/save.hh>
36 
37 #include <scribo/binarization/global_threshold_auto.hh>
38 #include <scribo/preprocessing/deskew.hh>
39 #include <scribo/filter/objects_small.hh>
40 #include <scribo/filter/objects_thin.hh>
41 
42 #include <scribo/debug/usage.hh>
43 
44 const char *args_desc[][2] =
45 {
46  { "input.pgm", "A gray-level image." },
47  {0, 0}
48 };
49 
50 int main(int argc, char *argv[])
51 {
52  using namespace mln;
53 
54  if (argc != 3)
55  return scribo::debug::usage(argv,
56  "Generic image preprocessing",
57  "input.pgm output.pbm",
58  args_desc);
59 
60  mln_trace("main");
61 
62  typedef image2d<value::int_u8> I;
63  I input;
64  io::pgm::load(input, argv[1]);
65 
68 
69  value::label_16 nlabels;
70  input_bw = scribo::filter::components_small(input_bw, c8(),
71  nlabels, 3);
72  input_bw = scribo::filter::components_thin(input_bw, c8(),
73  nlabels, 1);
74 
76  input_gl = data::convert(value::int_u8(), input_bw);
77  input_gl = scribo::preprocessing::deskew(input_gl);
78  input_bw = data::convert(bool(), input_gl);
79 
80  io::pbm::save(input_bw, argv[2]);
81 
82 
83 }