testFeatureSegment.cpp

Shows how to build a task with a segment visual feature.

/****************************************************************************
 *
 * 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:
 * Visual feature manipulation (segment).
 *
*****************************************************************************/
 
#include <fstream>
#include <iostream>
#include <numeric>
#include <vector>
 
#include <visp3/core/vpConfig.h>
 
#if defined(VISP_HAVE_MODULE_ROBOT) &&                                                                                 \
    (defined(VISP_HAVE_LAPACK) || defined(VISP_HAVE_EIGEN3) || defined(VISP_HAVE_OPENCV))
 
#include <visp3/core/vpCameraParameters.h>
#include <visp3/core/vpDisplay.h>
#include <visp3/core/vpHomogeneousMatrix.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpMath.h>
#include <visp3/core/vpPoint.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/gui/vpPlot.h>
#include <visp3/io/vpParseArgv.h>
#include <visp3/robot/vpSimulatorCamera.h>
#include <visp3/visual_features/vpFeatureBuilder.h>
#include <visp3/visual_features/vpFeatureSegment.h>
#include <visp3/vs/vpServo.h> //visual servoing task
 
int main(int argc, const char **argv)
{
  try {
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    int opt_no_display = 0;
    int opt_curves = 1;
#endif
    int opt_normalized = 1;
 
    // Parse the command line to set the variables
    vpParseArgv::vpArgvInfo argTable [] = {
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
      {"-d", vpParseArgv::ARGV_CONSTANT_INT, 0, (char *)&opt_no_display, "Disable display and graphics viewer."},
#endif
      {"-normalized", vpParseArgv::ARGV_INT, (char *)nullptr, (char *)&opt_normalized,
       "1 to use normalized features, 0 for non normalized."},
      {"-h", vpParseArgv::ARGV_HELP, (char *)nullptr, (char *)nullptr, "Print the help."},
      {(char *)nullptr, vpParseArgv::ARGV_END, (char *)nullptr, (char *)nullptr, (char *)nullptr}
    };
 
    // Read the command line options
    if (vpParseArgv::parse(&argc, argv, argTable,
                           vpParseArgv::ARGV_NO_LEFTOVERS | vpParseArgv::ARGV_NO_ABBREV |
                           vpParseArgv::ARGV_NO_DEFAULTS)) {
      return (false);
    }
 
    std::cout << "Used options: " << std::endl;
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    opt_curves = (opt_no_display == 0) ? 1 : 0;
    std::cout << " - no display: " << opt_no_display << std::endl;
    std::cout << " - curves    : " << opt_curves << std::endl;
#endif
    std::cout << " - normalized: " << opt_normalized << std::endl;
 
    vpCameraParameters cam(640., 480., 320., 240.);
 
#if defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI)
    vpDisplay *display = nullptr;
    if (!opt_no_display) {
#if defined(VISP_HAVE_X11)
      display = new vpDisplayX;
#elif defined(VISP_HAVE_GDI)
      display = new vpDisplayGDI;
#endif
    }
#endif
    vpImage<unsigned char> I(480, 640, 0);
 
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    if (!opt_no_display)
      display->init(I);
#endif
 
    vpHomogeneousMatrix wMo; // Set to identity. Robot world frame is equal to object frame
    vpHomogeneousMatrix cMo(-0.5, 0.5, 2., vpMath::rad(10), vpMath::rad(20), vpMath::rad(30));
    vpHomogeneousMatrix cdMo(0., 0., 1., vpMath::rad(0), vpMath::rad(0), vpMath::rad(0));
    vpHomogeneousMatrix wMc; // Camera location in the robot world frame
 
    vpPoint P[4]; // 4 points in the object frame
    P[0].setWorldCoordinates(.1, .1, 0.);
    P[1].setWorldCoordinates(-.1, .1, 0.);
    P[2].setWorldCoordinates(-.1, -.1, 0.);
    P[3].setWorldCoordinates(.1, -.1, 0.);
 
    vpPoint Pd[4]; // 4 points in the desired camera frame
    for (int i = 0; i < 4; i++) {
      Pd[i] = P[i];
      Pd[i].project(cdMo);
    }
    vpPoint Pc[4]; // 4 points in the current camera frame
    for (int i = 0; i < 4; i++) {
      Pc[i] = P[i];
      Pc[i].project(cMo);
    }
 
    vpFeatureSegment seg_cur[2], seg_des[2]; // Current and desired features
    for (int i = 0; i < 2; i++) {
      if (opt_normalized) {
        seg_cur[i].setNormalized(true);
        seg_des[i].setNormalized(true);
      }
      else {
        seg_cur[i].setNormalized(false);
        seg_des[i].setNormalized(false);
      }
      vpFeatureBuilder::create(seg_cur[i], Pc[i * 2], Pc[i * 2 + 1]);
      vpFeatureBuilder::create(seg_des[i], Pd[i * 2], Pd[i * 2 + 1]);
      seg_cur[i].print();
      seg_des[i].print();
    }
 
    // define visual servoing task
    vpServo task;
    task.setServo(vpServo::EYEINHAND_CAMERA);
    task.setInteractionMatrixType(vpServo::CURRENT);
    task.setLambda(2.);
 
    for (int i = 0; i < 2; i++)
      task.addFeature(seg_cur[i], seg_des[i]);
 
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    if (!opt_no_display) {
      vpDisplay::display(I);
      for (int i = 0; i < 2; i++) {
        seg_cur[i].display(cam, I, vpColor::red);
        seg_des[i].display(cam, I, vpColor::green);
        vpDisplay::flush(I);
      }
    }
#endif
 
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    vpPlot *graph = nullptr;
    if (opt_curves) {
      // Create a window (700 by 700) at position (100, 200) with two graphics
      graph = new vpPlot(2, 500, 500, 700, 10, "Curves...");
 
      // The first graphic contains 3 curve and the second graphic contains 3
      // curves
      graph->initGraph(0, 6);
      graph->initGraph(1, 8);
      //     graph->setTitle(0, "Velocities");
      //     graph->setTitle(1, "Error s-s*");
    }
#endif
 
    // param robot
    vpSimulatorCamera robot;
    float sampling_time = 0.02f; // Sampling period in seconds
    robot.setSamplingTime(sampling_time);
    robot.setMaxTranslationVelocity(5.);
    robot.setMaxRotationVelocity(vpMath::rad(90.));
    wMc = wMo * cMo.inverse();
    robot.setPosition(wMc);
    int iter = 0;
 
    do {
      double t = vpTime::measureTimeMs();
      wMc = robot.getPosition();
      cMo = wMc.inverse() * wMo;
      for (int i = 0; i < 4; i++)
        Pc[i].project(cMo);
 
      for (int i = 0; i < 2; i++)
        vpFeatureBuilder::create(seg_cur[i], Pc[i * 2], Pc[i * 2 + 1]);
 
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
      if (!opt_no_display) {
        vpDisplay::display(I);
        for (int i = 0; i < 2; i++) {
          seg_cur[i].display(cam, I, vpColor::red);
          seg_des[i].display(cam, I, vpColor::green);
          vpDisplay::flush(I);
        }
      }
#endif
 
      vpColVector v = task.computeControlLaw();
      robot.setVelocity(vpRobot::CAMERA_FRAME, v);
 
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
      if (opt_curves) {
        graph->plot(0, iter, v);               // plot velocities applied to the robot
        graph->plot(1, iter, task.getError()); // plot error vector
      }
#endif
 
      vpTime::wait(t, sampling_time * 1000); // Wait 10 ms
      iter++;
 
    } while ((task.getError()).sumSquare() > 0.0005);
 
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    if (graph != nullptr)
      delete graph;
#endif
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI))
    if (!opt_no_display && display != nullptr)
      delete display;
#endif
 
    std::cout << "final error=" << (task.getError()).sumSquare() << std::endl;
    return EXIT_SUCCESS;
  }
  catch (const vpException &e) {
    std::cout << "Catch an exception: " << e << std::endl;
    return EXIT_FAILURE;
  }
}
 
#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 << "Test empty since visp_robot module is not available.\n" << std::endl;
  return EXIT_SUCCESS;
}
 
#endif