Visual Servoing Platform  version 3.1.0
Static Public Member Functions | List of all members
vpMeterPixelConversion Class Reference
core: Core module » Camera model

#include <visp3/core/vpMeterPixelConversion.h>

Static Public Member Functions

static void convertEllipse (const vpCameraParameters &cam, const vpCircle &circle, vpImagePoint &center, double &mu20_p, double &mu11_p, double &mu02_p)
 
static void convertLine (const vpCameraParameters &cam, const double &rho_m, const double &theta_m, double &rho_p, double &theta_p)
 
static void convertPoint (const vpCameraParameters &cam, const double &x, const double &y, double &u, double &v)
 
static void convertPoint (const vpCameraParameters &cam, const double &x, const double &y, vpImagePoint &iP)
 

Detailed Description

Conversion from normalized coordinates $(x,y)$ in meter to pixel coordinates $(u,v)$.

This class relates to vpCameraParameters.

Definition at line 66 of file vpMeterPixelConversion.h.

Member Function Documentation

◆ convertEllipse()

void vpMeterPixelConversion::convertEllipse ( const vpCameraParameters &  cam,
const vpCircle &  circle,
vpImagePoint &  center,
double &  mu20_p,
double &  mu11_p,
double &  mu02_p 
)
static

Converts an ellipse with parameters expressed in meter in the image plane in parameters expressed in the image in pixels.

The ellipse is here represented by its parameters $x_c,y_c,\mu_{20}, \mu_{11}, \mu_{02}$.

Parameters
cam[in]: Intrinsic camera parameters.
circle[in]: 3D circle with parameters circle.p[] expressed in meters in the image plane.
center[out]: Center of the corresponding ellipse in the image with coordinates expressed in pixels.
mu20_p,mu11_p,mu02_p[out]: Centered moments expressed in pixels.

The following code shows how to use this function:

vpCircle circle;
double mu20_p, mu11_p, mu02_p;
circle.changeFrame(cMo);
circle.projection();
vpMeterPixelConversion::convertEllipse(cam, circle, center_p, mu20_p, mu11_p, mu02_p);
vpDisplay::displayEllipse(I, center_p, mu20_p, mu11_p, mu02_p);

Definition at line 92 of file vpMeterPixelConversion.cpp.

References convertPoint(), vpCameraParameters::get_px(), vpCameraParameters::get_py(), vpTracker::p, and vpMath::sqr().

Referenced by vpMbtDistanceCircle::display(), vpMbtDistanceCircle::initMovingEdge(), and vpMbtDistanceCircle::updateMovingEdge().

◆ convertLine()

void vpMeterPixelConversion::convertLine ( const vpCameraParameters &  cam,
const double &  rho_m,
const double &  theta_m,
double &  rho_p,
double &  theta_p 
)
static

Line coordinates conversion (rho,theta).

Definition at line 52 of file vpMeterPixelConversion.cpp.

References vpException::divideByZeroError, vpMath::sqr(), and vpERROR_TRACE.

Referenced by vpMbtDistanceKltCylinder::display(), vpMbtDistanceCylinder::display(), vpFeatureDisplay::displayLine(), vpMbtDistanceLine::initMovingEdge(), vpMbtDistanceCylinder::initMovingEdge(), vpMbtDistanceLine::updateMovingEdge(), and vpMbtDistanceCylinder::updateMovingEdge().

◆ convertPoint() [1/2]

static void vpMeterPixelConversion::convertPoint ( const vpCameraParameters &  cam,
const double &  x,
const double &  y,
double &  u,
double &  v 
)
inlinestatic

Point coordinates conversion from normalized coordinates $(x,y)$ in meter to pixel coordinates $(u,v)$.

The used formula depends on the projection model of the camera. To know the currently used projection model use vpCameraParameter::get_projModel()

Parameters
cam: camera parameters.
x: input coordinate in meter along image plane x-axis.
y: input coordinate in meter along image plane y-axis.
u: output coordinate in pixels along image horizontal axis.
v: output coordinate in pixels along image vertical axis.

$ u = x*p_x + u_0 $ and $ v = y*p_y + v_0 $ in the case of perspective projection without distortion.

$ u = x*p_x*(1+k_{ud}*r^2)+u_0 $ and $ v = y*p_y*(1+k_{ud}*r^2)+v_0 $ with $ r^2 = x^2+y^2 $ in the case of perspective projection with distortion.

Examples:
tutorial-homography-from-points.cpp, tutorial-ibvs-4pts-display.cpp, tutorial-ibvs-4pts-wireframe-camera.cpp, tutorial-ibvs-4pts-wireframe-robot-afma6.cpp, and tutorial-ibvs-4pts-wireframe-robot-viper.cpp.

Definition at line 98 of file vpMeterPixelConversion.h.

References vpCameraParameters::perspectiveProjWithDistortion, and vpCameraParameters::perspectiveProjWithoutDistortion.

Referenced by vpPolygon::buildFrom(), vpKeyPoint::computePose(), vpMbtFaceDepthDense::computeROI(), vpMbtFaceDepthNormal::computeROI(), convertEllipse(), vpFeatureBuilder::create(), vpFeatureSegment::display(), vpProjectionDisplay::display(), vpMbtDistanceLine::display(), vpMbtDistanceKltPoints::display(), vpProjectionDisplay::displayCamera(), vpFeatureDisplay::displayEllipse(), vpMbtFaceDepthNormal::displayFeature(), vpPose::displayModel(), vpFeatureDisplay::displayPoint(), vpPolygon3D::getNbCornerInsideImage(), vpPolygon3D::getRoi(), vpPolygon3D::getRoiClipped(), vpImageSimulator::init(), vpMbtDistanceLine::initMovingEdge(), vpKeyPoint::matchPointAndDetect(), vpWireFrameSimulator::projectCameraTrajectory(), vpSimulatorAfma6::updateArticularPosition(), vpSimulatorViper850::updateArticularPosition(), vpMbtDistanceLine::updateMovingEdge(), and vpKinect::warpRGBFrame().

◆ convertPoint() [2/2]

static void vpMeterPixelConversion::convertPoint ( const vpCameraParameters &  cam,
const double &  x,
const double &  y,
vpImagePoint &  iP 
)
inlinestatic

Point coordinates conversion from normalized coordinates $(x,y)$ in meter to pixel coordinates.

The used formula depends on the projection model of the camera. To know the currently used projection model use vpCameraParameter::get_projModel()

Parameters
cam: camera parameters.
x: input coordinate in meter along image plane x-axis.
y: input coordinate in meter along image plane y-axis.
iP: output coordinates in pixels.

In the frame (u,v) the result is given by:

$ u = x*p_x + u_0 $ and $ v = y*p_y + v_0 $ in the case of perspective projection without distortion.

$ u = x*p_x*(1+k_{ud}*r^2)+u_0 $ and $ v = y*p_y*(1+k_{ud}*r^2)+v_0 $ with $ r^2 = x^2+y^2 $ in the case of perspective projection with distortion.

Definition at line 134 of file vpMeterPixelConversion.h.

References vpCameraParameters::perspectiveProjWithDistortion, vpCameraParameters::perspectiveProjWithoutDistortion, vpImagePoint::set_u(), and vpImagePoint::set_v().