ExampleCheckerboard.cpp

/* 
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
Multimediale Systeme der Informationsverarbeitung
Institut fuer Informatik
Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/**
   @example ExampleCheckerboard.cpp
   @relates CheckerboardDetector
   @brief Example for usage of Checkerboard Detector
   Usage:  ExampleCheckerboard <filename> <inner_xCorners> <inner_yCorners>
   @ingroup g_examples
   @author MIP
*/

#include <Base/Common/W32Compat.hh>
#include <math.h>
#include <vector>
#include <string>
#include <iostream>
#include <Base/Debug/Error.hh>
#include <Base/Image/Image.hh>
#include <Base/Image/ImageIO.hh>
#include <Base/Common/FileHandling.hh>
#include <FeatureDetector/CheckerboardDetector.hh>

using namespace std;
using namespace BIAS;

int main(int argc, char** argv)
{
  // params
  string imgFilename(BIAS_TESTS_DATA "chess7x4_002.jpg");
  unsigned int xCorners(7), yCorners(4); // inner corners

  // parse args
  if (argc > 1)
    imgFilename = argv[1];
  if (argc > 2)
    xCorners = atoi(argv[2]);
  if (argc > 3)
    yCorners = atoi(argv[3]);

  if (argc < 2)
    cout << "Usage: ExampleCheckerboard [<image>] [<corners x>] [<corners y>]"
         << endl << endl
         << "Default: image " << imgFilename << " with 7 x 4 corners"
         << endl << endl;
  else
    cout << "Detecting " << xCorners << "x " << yCorners << " corners in image " 
         << imgFilename << endl << endl;

  cout << "Loading image " << imgFilename << endl;
  BIAS::Image<unsigned char> img;
  if (ImageIO::Load(imgFilename, img)!=0) 
  {
    cout << "Failed to load image " << imgFilename << "!" << endl;
    return -1;
  }

  // storage for detected positions (resizing is done by CheckerboardDetector::Compute)
  vector< pair<float,float> > coords;

  // detect chessboard corners
  int result = CheckerboardDetector::Compute(img, xCorners , yCorners, coords, true);
  if (result != 0){
    cout << "Failed to detect corners!" << endl;
    return -1;
  }

  // print result corners
  cout << "Detected " << coords.size() << " corners : " << endl;
  for (unsigned int i = 0; i < coords.size(); i++) {
    cout << "[" << (i+1) << "] corner " << coords[i].first << ", " << coords[i].second
         << endl;
  }
  cout << endl;

  return 0;
}