vpMeterPixelConversion.cpp

/****************************************************************************
 *
 * 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 http://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:
 * Meter to pixel conversion.
 *
 * Authors:
 * Eric Marchand
 * Anthony Saunier
 *
 *****************************************************************************/

#include <visp3/core/vpCameraParameters.h>
#include <visp3/core/vpDebug.h>
#include <visp3/core/vpException.h>
#include <visp3/core/vpMath.h>
#include <visp3/core/vpMeterPixelConversion.h>

void vpMeterPixelConversion::convertLine(const vpCameraParameters &cam,
                                         const double &rho_m, const double &theta_m,
                                         double &rho_p, double &theta_p)
{
  double co = cos(theta_m);
  double si = sin(theta_m);
  double d = sqrt(vpMath::sqr(cam.py * co) + vpMath::sqr(cam.px * si));

  if (fabs(d) < 1e-6) {
    vpERROR_TRACE("division by zero");
    throw(vpException(vpException::divideByZeroError, "division by zero"));
  }

  theta_p = atan2(cam.px * si, cam.py * co);
  rho_p = (cam.px * cam.py * rho_m + cam.u0 * cam.py * co + cam.v0 * cam.px * si);
  rho_p /= d;
}

void vpMeterPixelConversion::convertEllipse(const vpCameraParameters &cam,
                                            const vpCircle &circle, vpImagePoint &center_p,
                                            double &n20_p, double &n11_p, double &n02_p)
{
  // Get the parameters of the ellipse in the image plane
  double xc_m = circle.p[0];
  double yc_m = circle.p[1];
  double n20_m = circle.p[2];
  double n11_m = circle.p[3];
  double n02_m = circle.p[4];

  // Convert from meter to pixels
  vpMeterPixelConversion::convertPoint(cam, xc_m, yc_m, center_p);
  n20_p = n20_m * vpMath::sqr(cam.get_px());
  n11_p = n11_m * cam.get_px() * cam.get_py();
  n02_p = n02_m * vpMath::sqr(cam.get_py());
}

void vpMeterPixelConversion::convertEllipse(const vpCameraParameters &cam, const vpSphere &sphere, vpImagePoint &center_p,
                                            double &n20_p, double &n11_p, double &n02_p)
{
  // Get the parameters of the ellipse in the image plane
  double xc_m = sphere.p[0];
  double yc_m = sphere.p[1];
  double n20_m = sphere.p[2];
  double n11_m = sphere.p[3];
  double n02_m = sphere.p[4];

  // Convert from meter to pixels
  vpMeterPixelConversion::convertPoint(cam, xc_m, yc_m, center_p);
  n20_p = n20_m * vpMath::sqr(cam.get_px());
  n11_p = n11_m * cam.get_px() * cam.get_py();
  n02_p = n02_m * vpMath::sqr(cam.get_py());
}

void vpMeterPixelConversion::convertEllipse(const vpCameraParameters &cam,
                                            double xc_m, double yc_m, double n20_m, double n11_m, double n02_m,
                                            vpImagePoint &center_p, double &n20_p, double &n11_p, double &n02_p)
{
  // Convert from meter to pixels
  vpMeterPixelConversion::convertPoint(cam, xc_m, yc_m, center_p);
  n20_p = n20_m * vpMath::sqr(cam.get_px());
  n11_p = n11_m * cam.get_px() * cam.get_py();
  n02_p = n02_m * vpMath::sqr(cam.get_py());
}

#if VISP_HAVE_OPENCV_VERSION >= 0x020300

void vpMeterPixelConversion::convertLine(const cv::Mat &cameraMatrix,
                                         const double &rho_m, const double &theta_m,
                                         double &rho_p, double &theta_p)
{
  double co = cos(theta_m);
  double si = sin(theta_m);
  double px = cameraMatrix.at<double>(0,0);
  double py = cameraMatrix.at<double>(1,1);
  double u0 = cameraMatrix.at<double>(0,2);
  double v0 = cameraMatrix.at<double>(1,2);
  double d = sqrt(vpMath::sqr(py * co) + vpMath::sqr(px * si));

  if (fabs(d) < 1e-6) {
    vpERROR_TRACE("division by zero");
    throw(vpException(vpException::divideByZeroError, "division by zero"));
  }

  theta_p = atan2(px * si, py * co);
  rho_p = (px * py * rho_m + u0 * py * co + v0 * px * si);
  rho_p /= d;
}

void vpMeterPixelConversion::convertEllipse(const cv::Mat &cameraMatrix,
                                            const vpCircle &circle, vpImagePoint &center,
                                            double &n20_p, double &n11_p, double &n02_p)
{
  double px = cameraMatrix.at<double>(0,0);
  double py = cameraMatrix.at<double>(1,1);
  cv::Mat distCoeffs = cv::Mat::zeros(5,1,CV_64FC1);
  // Get the parameters of the ellipse in the image plane
  double xc_m = circle.p[0];
  double yc_m = circle.p[1];
  double n20_m = circle.p[2];
  double n11_m = circle.p[3];
  double n02_m = circle.p[4];

  // Convert from meter to pixels
  vpMeterPixelConversion::convertPoint(cameraMatrix, distCoeffs, xc_m, yc_m, center);
  n20_p = n20_m * vpMath::sqr(px);
  n11_p = n11_m * px * py;
  n02_p = n02_m * vpMath::sqr(py);
}

void vpMeterPixelConversion::convertEllipse(const cv::Mat &cameraMatrix,
                                            const vpSphere &sphere, vpImagePoint &center,
                                            double &n20_p, double &n11_p, double &n02_p)
{
  double px = cameraMatrix.at<double>(0,0);
  double py = cameraMatrix.at<double>(1,1);
  cv::Mat distCoeffs = cv::Mat::zeros(5,1,CV_64FC1);
  // Get the parameters of the ellipse in the image plane
  double xc_m = sphere.p[0];
  double yc_m = sphere.p[1];
  double n20_m = sphere.p[2];
  double n11_m = sphere.p[3];
  double n02_m = sphere.p[4];

  // Convert from meter to pixels
  vpMeterPixelConversion::convertPoint(cameraMatrix, distCoeffs, xc_m, yc_m, center);
  n20_p = n20_m * vpMath::sqr(px);
  n11_p = n11_m * px * py;
  n02_p = n02_m * vpMath::sqr(py);
}

void vpMeterPixelConversion::convertEllipse(const cv::Mat &cameraMatrix,
                                            double xc_m, double yc_m, double n20_m, double n11_m, double n02_m,
                                            vpImagePoint &center_p, double &n20_p, double &n11_p, double &n02_p)
{
  double px = cameraMatrix.at<double>(0,0);
  double py = cameraMatrix.at<double>(1,1);
  cv::Mat distCoeffs = cv::Mat::zeros(5,1,CV_64FC1);

  // Convert from meter to pixels
  vpMeterPixelConversion::convertPoint(cameraMatrix, distCoeffs, xc_m, yc_m, center_p);
  n20_p = n20_m * vpMath::sqr(px);
  n11_p = n11_m * px * py;
  n02_p = n02_m * vpMath::sqr(py);

}

void vpMeterPixelConversion::convertPoint(const cv::Mat &cameraMatrix, const cv::Mat &distCoeffs,
                                          const double &x, const double &y, double &u, double &v)
{
  std::vector<cv::Point3d> objectPoints_vec;
  objectPoints_vec.push_back(cv::Point3d(x, y, 1.0));
  std::vector<cv::Point2d> imagePoints_vec;
  cv::projectPoints(objectPoints_vec, cv::Mat::eye(3,3,CV_64FC1), cv::Mat::zeros(3,1,CV_64FC1), cameraMatrix, distCoeffs, imagePoints_vec);
  u = imagePoints_vec[0].x;
  v = imagePoints_vec[0].y;
}

void vpMeterPixelConversion::convertPoint(const cv::Mat &cameraMatrix, const cv::Mat &distCoeffs,
                                          const double &x, const double &y, vpImagePoint &iP)
{
  std::vector<cv::Point3d> objectPoints_vec;
  objectPoints_vec.push_back(cv::Point3d(x, y, 1.0));
  std::vector<cv::Point2d> imagePoints_vec;
  cv::projectPoints(objectPoints_vec, cv::Mat::eye(3,3,CV_64FC1), cv::Mat::zeros(3,1,CV_64FC1), cameraMatrix, distCoeffs, imagePoints_vec);
  iP.set_u(imagePoints_vec[0].x);
  iP.set_v(imagePoints_vec[0].y);
}
#endif