servoSimuSquareLine2DCamVelocityDisplay.cpp

Servo four lines:

• eye-in-hand control law,
• velocity computed in the camera frame,
• display the camera view.

/****************************************************************************
 *
 * $Id: servoSimuSquareLine2DCamVelocityDisplay.cpp 2457 2010-01-07 10:41:18Z nmelchio $
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2013 by INRIA. All rights reserved.
 * 
 * This software is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * ("GPL") version 2 as published by the Free Software Foundation.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact INRIA about acquiring a ViSP Professional 
 * Edition License.
 *
 * See http://www.irisa.fr/lagadic/visp/visp.html for more information.
 * 
 * This software was developed at:
 * INRIA Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 * http://www.irisa.fr/lagadic
 *
 * If you have questions regarding the use of this file, please contact
 * INRIA at visp@inria.fr
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *
 * Description:
 * Simulation of a 2D visual servoing on a line.
 *
 * Authors:
 * Nicolas Melchior
 *
 *****************************************************************************/

#include <visp/vpDebug.h>
#include <visp/vpConfig.h>

#if (defined (VISP_HAVE_X11) || defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI))

#include <stdlib.h>
#include <stdio.h>

#include <visp/vpCameraParameters.h>
#include <visp/vpDisplayX.h>
#include <visp/vpDisplayGTK.h>
#include <visp/vpDisplayGDI.h>
#include <visp/vpFeatureBuilder.h>
#include <visp/vpFeatureLine.h>
#include <visp/vpHomogeneousMatrix.h>
#include <visp/vpImage.h>
#include <visp/vpLine.h>
#include <visp/vpMath.h>
#include <visp/vpParseArgv.h>
#include <visp/vpRobotCamera.h>
#include <visp/vpServo.h>
#include <visp/vpServoDisplay.h>
#include <visp/vpSimulatorCamera.h>

// List of allowed command line options
#define GETOPTARGS  "cdh"

void usage(const char *name, const char *badparam)
{
  fprintf(stdout, "\n\
Simulation of 2D a visual servoing on a line:\n\
- eye-in-hand control law,\n\
- velocity computed in the camera frame,\n\
- display the camera view.\n\
          \n\
SYNOPSIS\n\
  %s [-c] [-d] [-h]\n", name);

  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
                  \n\
  -c\n\
     Disable the mouse click. Useful to automaze the \n\
     execution of this program without humain intervention.\n\
                  \n\
  -d \n\
     Turn off the display.\n\
                  \n\
  -h\n\
     Print the help.\n");

  if (badparam)
    fprintf(stdout, "\nERROR: Bad parameter [%s]\n", badparam);
}

bool getOptions(int argc, const char **argv, bool &click_allowed, bool &display)
{
  const char *optarg;
  int   c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg)) > 1) {

    switch (c) {
    case 'c': click_allowed = false; break;
    case 'd': display = false; break;
    case 'h': usage(argv[0], NULL); return false; break;

    default:
      usage(argv[0], optarg);
      return false; break;
    }
  }

  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], NULL);
    std::cerr << "ERROR: " << std::endl;
    std::cerr << "  Bad argument " << optarg << std::endl << std::endl;
    return false;
  }

  return true;
}


int
main(int argc, const char ** argv)
{
  bool opt_display = true;
  bool opt_click_allowed = true;

  // Read the command line options
  if (getOptions(argc, argv, opt_click_allowed, opt_display) == false) {
    exit (-1);
  }

  vpImage<unsigned char> I(512,512,0) ;

  // We open a window using either X11, GTK or GDI.
#if defined VISP_HAVE_X11
  vpDisplayX display;
#elif defined VISP_HAVE_GTK
  vpDisplayGTK display;
#elif defined VISP_HAVE_GDI
  vpDisplayGDI display;
#endif

  if (opt_display) {
    try{
      // Display size is automatically defined by the image (I) size
      display.init(I, 100, 100,"Camera view...") ;
      // Display the image
      // The image class has a member that specify a pointer toward
      // the display that has been initialized in the display declaration
      // therefore is is no longuer necessary to make a reference to the
      // display variable.
      vpDisplay::display(I) ;
      vpDisplay::flush(I) ;
    }
    catch(...)
    {
      vpERROR_TRACE("Error while displaying the image") ;
      exit(-1);
    }
  }

  // Set the camera parameters
  double px, py ; px = py = 600 ;
  double u0, v0 ; u0 = v0 = 256 ;

  vpCameraParameters cam(px,py,u0,v0);

  vpServo task ;
  vpSimulatorCamera robot ;

  // sets the initial camera location
  vpHomogeneousMatrix cMo(0.2,0.2,1,
                          vpMath::rad(45),  vpMath::rad(45),  vpMath::rad(125));

  // Compute the position of the object in the world frame
  vpHomogeneousMatrix wMc, wMo;
  robot.getPosition(wMc) ;
  wMo = wMc * cMo;

  // sets the final camera location (for simulation purpose)
  vpHomogeneousMatrix cMod(0,0,1,
                           vpMath::rad(0),  vpMath::rad(0),  vpMath::rad(0));


  int nbline = 4;

  // sets the line coordinates (2 planes) in the world frame
  vpLine line[4] ;
  line[0].setWorldCoordinates(1,0,0,0.05,0,0,1,0);
  line[1].setWorldCoordinates(0,1,0,0.05,0,0,1,0);
  line[2].setWorldCoordinates(1,0,0,-0.05,0,0,1,0);
  line[3].setWorldCoordinates(0,1,0,-0.05,0,0,1,0);

  vpFeatureLine ld[4] ;
  vpFeatureLine l[4] ;

  // sets the desired position of the visual feature
  for(int i = 0; i < nbline; i++)
  {
    line[i].track(cMod) ;
    line[i].print() ;

    vpFeatureBuilder::create(ld[i],line[i])  ;
  }

  // computes  the line coordinates in the camera frame and its 2D coordinates
  // sets the current position of the visual feature
  for(int i = 0; i < nbline; i++)
  {
    line[i].track(cMo) ;
    line[i].print() ;

    vpFeatureBuilder::create(l[i],line[i])  ;
    l[i].print() ;
  }

  // define the task
  // - we want an eye-in-hand control law
  // - robot is controlled in the camera frame
  task.setServo(vpServo::EYEINHAND_CAMERA) ;
  task.setInteractionMatrixType(vpServo::CURRENT, vpServo::PSEUDO_INVERSE);
  //It could be also interesting to test the following tasks
  //task.setInteractionMatrixType(vpServo::DESIRED, vpServo::PSEUDO_INVERSE);
  //task.setInteractionMatrixType(vpServo::MEAN, vpServo::PSEUDO_INVERSE);

  // we want to see a four lines on four lines
  for(int i = 0; i < nbline; i++)
    task.addFeature(l[i],ld[i]) ;

  vpDisplay::display(I) ;
  vpServoDisplay::display(task,cam,I) ;
  vpDisplay::flush(I) ; 

  // set the gain
  task.setLambda(1) ;

  // Display task information
  task.print() ;

  if (opt_display && opt_click_allowed) {
    std::cout << "\n\nClick in the camera view window to start..." << std::endl;
    vpDisplay::getClick(I) ;
  }

  unsigned int iter=0 ;
  // loop
  while(iter++<200)
  {
    std::cout << "---------------------------------------------" << iter <<std::endl ;
    vpColVector v ;

    // get the robot position
    robot.getPosition(wMc) ;
    // Compute the position of the camera wrt the object frame
    cMo = wMc.inverse() * wMo;

    // new line position: retrieve x,y and Z of the vpLine structure
    for(int i = 0; i < nbline; i++)
    {
      line[i].track(cMo) ;
      vpFeatureBuilder::create(l[i],line[i]);
    }

    if (opt_display) {
      vpDisplay::display(I) ;
      vpServoDisplay::display(task,cam,I) ;
      vpDisplay::flush(I) ;
    }

    // compute the control law
    v = task.computeControlLaw() ;

    // send the camera velocity to the controller
    robot.setVelocity(vpRobot::CAMERA_FRAME, v) ;

    std::cout << "|| s - s* || = " << ( task.getError() ).sumSquare() <<std::endl ; ;

  }

  if (opt_display && opt_click_allowed) {
    std::cout << "\nClick in the camera view window to end..." << std::endl;
    vpDisplay::getClick(I) ;
  }

  // Display task information
  task.print() ;
  task.kill();
}

#else
int
main()
{
  vpERROR_TRACE("You do not have X11, GTK or GDI display functionalities...");
}

#endif