Visual Servoing Platform  version 3.5.1 under development (2022-10-03)

Simulation of a visual servoing using theta U visual features:

* ViSP, open source Visual Servoing Platform software.
* Copyright (C) 2005 - 2019 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 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
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* Description:
* Simulation of a visual servoing using theta U visual features.
* tests the control law
* eye-in-hand control
* velocity computed in the camera frame
* using theta U visual feature
* Authors:
* Eric Marchand
* Fabien Spindler
#include <stdio.h>
#include <stdlib.h>
#include <visp3/core/vpHomogeneousMatrix.h>
#include <visp3/core/vpMath.h>
#include <visp3/io/vpParseArgv.h>
#include <visp3/robot/vpSimulatorCamera.h>
#include <visp3/visual_features/vpFeatureThetaU.h>
#include <visp3/visual_features/vpFeatureTranslation.h>
#include <visp3/vs/vpServo.h>
// List of allowed command line options
#define GETOPTARGS "h"
void usage(const char *name, const char *badparam);
bool getOptions(int argc, const char **argv);
void usage(const char *name, const char *badparam)
fprintf(stdout, "\n\
Simulation of avisual servoing using theta U visual feature:\n\
- eye-in-hand control law,\n\
- velocity computed in the camera frame,\n\
- without display.\n\
%s [-h]\n",
fprintf(stdout, "\n\
OPTIONS: Default\n\
Print the help.\n");
if (badparam)
fprintf(stdout, "\nERROR: Bad parameter [%s]\n", badparam);
bool getOptions(int argc, const char **argv)
const char *optarg_;
int c;
while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg_)) > 1) {
switch (c) {
case 'h':
usage(argv[0], NULL);
return false;
usage(argv[0], optarg_);
return false;
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)
#if (defined(VISP_HAVE_LAPACK) || defined(VISP_HAVE_EIGEN3) || defined(VISP_HAVE_OPENCV))
try {
// Read the command line options
if (getOptions(argc, argv) == false) {
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, velocity computed in the camera frame" << std::endl;
std::cout << " Simulation " << std::endl;
std::cout << " task : servo using theta U visual feature " << std::endl;
std::cout << "-------------------------------------------------------" << std::endl;
std::cout << std::endl;
// sets the initial camera location
vpPoseVector c_r_o(0.1, 0.2, 2, vpMath::rad(20), vpMath::rad(10), vpMath::rad(50));
vpHomogeneousMatrix cMo(c_r_o);
// Compute the position of the object in the world frame
wMo = wMc * cMo;
// sets the desired camera location
vpPoseVector cd_r_o(0, 0, 1, vpMath::rad(0), vpMath::rad(0), vpMath::rad(0));
vpHomogeneousMatrix cdMo(cd_r_o);
// compute the rotation that the camera has to realize
cdMc = cdMo * cMo.inverse();
// define the task
// - we want an eye-in-hand control law
// - robot is controlled in the camera frame
// - set the gain
// Display task information
unsigned int iter = 0;
// loop
while (iter++ < 200) {
std::cout << "---------------------------------------------" << iter << std::endl;
// get the robot position
// Compute the position of the object frame in the camera frame
cMo = wMc.inverse() * wMo;
// new rotation to achieve
cdMc = cdMo * cMo.inverse();
// compute the control law
v = task.computeControlLaw();
// send the camera velocity to the controller
std::cout << "|| s - s* || = " << (task.getError()).sumSquare() << std::endl;
// Display task information
} catch (const vpException &e) {
std::cout << "Catch a ViSP exception: " << e << std::endl;
std::cout << "Cannot run this example: install Lapack, Eigen3 or OpenCV" << std::endl;
Implementation of column vector and the associated operations.
Definition: vpColVector.h:131
error that can be emited by ViSP classes.
Definition: vpException.h:72
Class that defines a 3D visual feature from a axis/angle parametrization that represent the rotatio...
Implementation of an homogeneous matrix and operations on such kind of matrices.
vpHomogeneousMatrix inverse() const
void buildFrom(const vpTranslationVector &t, const vpRotationMatrix &R)
static double rad(double deg)
Definition: vpMath.h:117
static bool parse(int *argcPtr, const char **argv, vpArgvInfo *argTable, int flags)
Definition: vpParseArgv.cpp:69
Implementation of a pose vector and operations on poses.
Definition: vpPoseVector.h:152
void setVelocity(const vpRobot::vpControlFrameType frame, const vpColVector &vel)
Definition: vpRobot.h:83
void setInteractionMatrixType(const vpServoIteractionMatrixType &interactionMatrixType, const vpServoInversionType &interactionMatrixInversion=PSEUDO_INVERSE)
Definition: vpServo.cpp:564
Definition: vpServo.h:155
void print(const vpServo::vpServoPrintType display_level=ALL, std::ostream &os=std::cout)
Definition: vpServo.cpp:303
void setLambda(double c)
Definition: vpServo.h:404
void setServo(const vpServoType &servo_type)
Definition: vpServo.cpp:215
vpColVector getError() const
Definition: vpServo.h:278
vpColVector computeControlLaw()
Definition: vpServo.cpp:926
Definition: vpServo.h:186
void addFeature(vpBasicFeature &s, vpBasicFeature &s_star, unsigned int select=vpBasicFeature::FEATURE_ALL)
Definition: vpServo.cpp:487
Class that defines the simplest robot: a free flying camera.