servoSimuViper850FourPoints2DCamVelocity.cpp

Simulation of a 2D visual servoing:Simulation of a 2D visual servoing:

• servo on 4 points with cartesian coordinates,
• eye-in-hand control law,
• camera velocities are computed,
• display internal camera view and an external view.

Interaction matrix is computed as the mean of the current and desired interaction matrix.

/****************************************************************************
 *
 * ViSP, open source Visual Servoing Platform software.
 * Copyright (C) 2005 - 2023 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 as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 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 https://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * 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 using 4 points with polar
 * coordinates as visual feature.
 *
*****************************************************************************/
 
#include <visp3/core/vpConfig.h>
#include <visp3/core/vpDebug.h>
 
#if defined(VISP_HAVE_THREADS) && (defined(VISP_HAVE_X11) || defined(VISP_HAVE_OPENCV) || defined(VISP_HAVE_GDI)) \
  && (defined(VISP_HAVE_LAPACK) || defined(VISP_HAVE_EIGEN3) || defined(VISP_HAVE_OPENCV))
 
// We need to use threading capabilities. Thus on Unix-like
// platforms, the libpthread third-party library need to be
// installed. On Windows, we use the native threading capabilities.
 
#include <stdio.h>
#include <stdlib.h>
 
#include <visp3/core/vpCameraParameters.h>
#include <visp3/core/vpHomogeneousMatrix.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpImagePoint.h>
#include <visp3/core/vpIoTools.h>
#include <visp3/core/vpMath.h>
#include <visp3/core/vpMeterPixelConversion.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/io/vpParseArgv.h>
#include <visp3/robot/vpSimulatorViper850.h>
#include <visp3/visual_features/vpFeatureBuilder.h>
#include <visp3/visual_features/vpFeaturePoint.h>
#include <visp3/vs/vpServo.h>
 
// List of allowed command line options
#define GETOPTARGS "cdh"
 
#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif
 
void usage(const char *name, const char *badparam);
bool getOptions(int argc, const char **argv, bool &click_allowed, bool &display);
 
void usage(const char *name, const char *badparam)
{
  fprintf(stdout, "\n\
Tests a control law with the following characteristics:\n\
- eye-in-hand control\n\
- articular velocity are computed\n\
- servo on 4 points,\n\
- internal and external camera view displays.\n\
          \n\
SYNOPSIS\n\
  %s [-c] [-d] [-h]\n",
          name);
 
  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
  -c\n\
     Disable the mouse click. Useful to automate the \n\
     execution of this program without human 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], nullptr);
      return false;
      break;
 
    default:
      usage(argv[0], optarg_);
      return false;
      break;
    }
  }
 
  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], nullptr);
    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)
{
  try {
    bool opt_click_allowed = true;
    bool opt_display = true;
 
    // Read the command line options
    if (getOptions(argc, argv, opt_click_allowed, opt_display) == false) {
      return EXIT_FAILURE;
    }
 
    // We open two displays, one for the internal camera view, the other one for
    // the external view, using either X11, GTK or GDI.
#if defined(VISP_HAVE_X11)
    vpDisplayX displayInt;
#elif defined(VISP_HAVE_GDI)
    vpDisplayGDI displayInt;
#elif defined(HAVE_OPENCV_HIGHGUI)
    vpDisplayOpenCV displayInt;
#endif
 
    // open a display for the visualization
 
    vpImage<unsigned char> Iint(480, 640, 255);
 
    if (opt_display) {
      displayInt.init(Iint, 700, 0, "Internal view");
    }
 
    vpServo task;
 
    std::cout << std::endl;
    std::cout << "----------------------------------------------" << std::endl;
    std::cout << " Test program for vpServo " << std::endl;
    std::cout << " Eye-in-hand task control, articular velocity are computed" << std::endl;
    std::cout << " Simulation " << std::endl;
    std::cout << " task : servo 4 points " << std::endl;
    std::cout << "----------------------------------------------" << std::endl;
    std::cout << std::endl;
 
    // sets the initial camera location
    vpHomogeneousMatrix cMo(-0.05, -0.05, 0.7, vpMath::rad(10), vpMath::rad(10), vpMath::rad(-30));
 
    // sets the point coordinates in the object frame
    vpPoint point[4];
    point[0].setWorldCoordinates(-0.045, -0.045, 0);
    point[3].setWorldCoordinates(-0.045, 0.045, 0);
    point[2].setWorldCoordinates(0.045, 0.045, 0);
    point[1].setWorldCoordinates(0.045, -0.045, 0);
 
    // computes the point coordinates in the camera frame and its 2D
    // coordinates
    for (unsigned int i = 0; i < 4; i++)
      point[i].track(cMo);
 
    // sets the desired position of the point
    vpFeaturePoint p[4];
    for (unsigned int i = 0; i < 4; i++)
      vpFeatureBuilder::create(p[i], point[i]); // retrieve x,y and Z of the vpPoint structure
 
    // sets the desired position of the feature point s*
    vpFeaturePoint pd[4];
 
    // Desired pose
    vpHomogeneousMatrix cdMo(vpHomogeneousMatrix(0.0, 0.0, 0.8, vpMath::rad(0), vpMath::rad(0), vpMath::rad(0)));
 
    // Projection of the points
    for (unsigned int i = 0; i < 4; i++)
      point[i].track(cdMo);
 
    for (unsigned int i = 0; i < 4; i++)
      vpFeatureBuilder::create(pd[i], point[i]);
 
    // define the task
    // - we want an eye-in-hand control law
    // - articular velocity are computed
    task.setServo(vpServo::EYEINHAND_CAMERA);
    task.setInteractionMatrixType(vpServo::DESIRED);
 
    // - we want to see a point on a point
    for (unsigned int i = 0; i < 4; i++)
      task.addFeature(p[i], pd[i]);
 
    // set the gain
    task.setLambda(0.8);
 
    // Declaration of the robot
    vpSimulatorViper850 robot(opt_display);
 
    // Initialise the robot and especially the camera
    robot.init(vpViper850::TOOL_PTGREY_FLEA2_CAMERA, vpCameraParameters::perspectiveProjWithoutDistortion);
    robot.setRobotState(vpRobot::STATE_VELOCITY_CONTROL);
 
    // Initialise the object for the display part
    robot.initScene(vpWireFrameSimulator::PLATE, vpWireFrameSimulator::D_STANDARD);
 
    // Initialise the position of the object relative to the pose of the
    // robot's camera
    robot.initialiseObjectRelativeToCamera(cMo);
 
    // Set the desired position (for the display part)
    robot.setDesiredCameraPosition(cdMo);
 
    // Get the internal robot's camera parameters
    vpCameraParameters cam;
    robot.getCameraParameters(cam, Iint);
 
    if (opt_display) {
      // Get the internal view
      vpDisplay::display(Iint);
      robot.getInternalView(Iint);
      vpDisplay::flush(Iint);
    }
 
    // Display task information
    task.print();
 
    unsigned int iter = 0;
    // loop
    while (iter++ < 500) {
      std::cout << "---------------------------------------------" << iter << std::endl;
      vpColVector v;
 
      // Get the Time at the beginning of the loop
      double t = vpTime::measureTimeMs();
 
      // Get the current pose of the camera
      cMo = robot.get_cMo();
 
      if (iter == 1) {
        std::cout << "Initial robot position with respect to the object frame:\n";
        cMo.print();
      }
 
      // new point position
      for (unsigned int i = 0; i < 4; i++) {
        point[i].track(cMo);
        // retrieve x,y and Z of the vpPoint structure
        vpFeatureBuilder::create(p[i], point[i]);
      }
 
      if (opt_display) {
        // Get the internal view and display it
        vpDisplay::display(Iint);
        robot.getInternalView(Iint);
        vpDisplay::flush(Iint);
      }
 
      if (opt_display && opt_click_allowed && iter == 1) {
        // suppressed for automate test
        std::cout << "Click in the internal view window to continue..." << std::endl;
        vpDisplay::getClick(Iint);
      }
 
      // 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;
 
      // The main loop has a duration of 10 ms at minimum
      vpTime::wait(t, 10);
    }
 
    // Display task information
    task.print();
 
    std::cout << "Final robot position with respect to the object frame:\n";
    cMo.print();
 
    if (opt_display && opt_click_allowed) {
      // suppressed for automate test
      std::cout << "Click in the internal view window to end..." << std::endl;
      vpDisplay::getClick(Iint);
    }
    return EXIT_SUCCESS;
  }
  catch (const vpException &e) {
    std::cout << "Catch a ViSP exception: " << e << std::endl;
    return EXIT_FAILURE;
  }
}
#elif !(defined(VISP_HAVE_X11) || defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI))
int main()
{
  std::cout << "You do not have X11, or GDI (Graphical Device Interface) of OpenCV functionalities to display images..."
    << std::endl;
  std::cout << "Tip if you are on a unix-like system:" << std::endl;
  std::cout << "- Install X11, configure again ViSP using cmake and build again this example" << std::endl;
  std::cout << "Tip if you are on a windows-like system:" << std::endl;
  std::cout << "- Install GDI, configure again ViSP using cmake and build again this example" << std::endl;
  return EXIT_SUCCESS;
}
#elif !(defined(VISP_HAVE_LAPACK) || defined(VISP_HAVE_EIGEN3) || defined(VISP_HAVE_OPENCV))
int main()
{
  std::cout << "Cannot run this example: install Lapack, Eigen3 or OpenCV" << std::endl;
  return EXIT_SUCCESS;
}
#else
int main()
{
  std::cout << "You do not have threading capabilities" << std::endl;
  std::cout << "Tip:" << std::endl;
  std::cout << "- Install pthread, configure again ViSP using cmake and build again this example" << std::endl;
  return EXIT_SUCCESS;
}
#endif