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vpMbtDistanceLine Class Reference
Features

#include <visp3/mbt/vpMbtDistanceLine.h>

Public Member Functions

 vpMbtDistanceLine ()
 
 ~vpMbtDistanceLine ()
 
void addPolygon (const int &index)
 
void buildFrom (vpPoint &_p1, vpPoint &_p2)
 
bool closeToImageBorder (const vpImage< unsigned char > &I, const unsigned int threshold)
 
void computeInteractionMatrixError (const vpHomogeneousMatrix &cMo)
 
void display (const vpImage< unsigned char > &I, const vpHomogeneousMatrix &cMo, const vpCameraParameters &cam, const vpColor col, const unsigned int thickness=1, const bool displayFullModel=false)
 
void display (const vpImage< vpRGBa > &I, const vpHomogeneousMatrix &cMo, const vpCameraParameters &cam, const vpColor col, const unsigned int thickness=1, const bool displayFullModel=false)
 
void displayMovingEdges (const vpImage< unsigned char > &I)
 
void getCameraParameters (vpCameraParameters &camera) const
 
unsigned int getIndex () const
 
double getMeanWeight () const
 
std::string getName () const
 
vpMbtPolygon & getPolygon ()
 
void initInteractionMatrixError ()
 
bool initMovingEdge (const vpImage< unsigned char > &I, const vpHomogeneousMatrix &cMo)
 
bool isTracked () const
 
bool isVisible () const
 
void reinitMovingEdge (const vpImage< unsigned char > &I, const vpHomogeneousMatrix &cMo)
 
void setCameraParameters (const vpCameraParameters &camera)
 
void setIndex (const unsigned int i)
 
void setMeanWeight (const double w_mean)
 
void setMovingEdge (vpMe *Me)
 
void setName (const std::string line_name)
 
void setName (const char *line_name)
 
void setTracked (const std::string &name, const bool &track)
 
void setVisible (bool _isvisible)
 
void trackMovingEdge (const vpImage< unsigned char > &I, const vpHomogeneousMatrix &cMo)
 
void updateMovingEdge (const vpImage< unsigned char > &I, const vpHomogeneousMatrix &cMo)
 
void updateTracked ()
 

Public Attributes

bool useScanLine
 
std::vector< vpMbtMeLine * > meline
 
vpLine * line
 
vpPoint * p1
 
vpPoint * p2
 
vpMatrix L
 
vpColVector error
 
std::vector< unsigned int > nbFeature
 
unsigned int nbFeatureTotal
 
bool Reinit
 
vpMbHiddenFaces< vpMbtPolygon > * hiddenface
 
std::list< int > Lindex_polygon
 
std::vector< bool > Lindex_polygon_tracked
 
bool isvisible
 

Detailed Description

Manage the line of a polygon used in the model-based tracker.

Definition at line 65 of file vpMbtDistanceLine.h.

Constructor & Destructor Documentation

vpMbtDistanceLine::vpMbtDistanceLine ( )

Basic constructor

Definition at line 58 of file vpMbtDistanceLine.cpp.

vpMbtDistanceLine::~vpMbtDistanceLine ( )

Basic destructor useful to deallocate the memory.

Definition at line 69 of file vpMbtDistanceLine.cpp.

References line, and meline.

Member Function Documentation

void vpMbtDistanceLine::addPolygon ( const int &  idx)

Add a polygon to the list of polygons the line belongs to.

Parameters
idx: Index of the polygon

Definition at line 223 of file vpMbtDistanceLine.cpp.

References Lindex_polygon, and Lindex_polygon_tracked.

Referenced by vpMbEdgeTracker::addLine().

void vpMbtDistanceLine::buildFrom ( vpPoint &  _p1,
vpPoint &  _p2 
)

Build a vpMbtDistanceLine thanks to two points corresponding to the extremities.

Parameters
_p1: The first extremity.
_p2: The second extremity.

Definition at line 165 of file vpMbtDistanceLine.cpp.

References vpPolygon3D::addPoint(), vpColVector::cross(), vpPoint::get_oX(), vpPoint::get_oY(), vpPoint::get_oZ(), line, vpPolygon3D::p, p1, p2, and vpPolygon3D::setNbPoint().

Referenced by vpMbEdgeTracker::addLine().

bool vpMbtDistanceLine::closeToImageBorder ( const vpImage< unsigned char > &  I,
const unsigned int  threshold 
)

Test wether the line is close to the border of the image (at a given threshold)

Parameters
I: the input image (to know its size)
threshold: the threshold in pixel
Returns
true if the line is near the border of the image

Definition at line 827 of file vpMbtDistanceLine.cpp.

References vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), isvisible, and meline.

Referenced by vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSFirstPhaseFactor(), and vpMbEdgeKltTracker::trackFirstLoop().

void vpMbtDistanceLine::computeInteractionMatrixError ( const vpHomogeneousMatrix &  cMo)

Compute the interaction matrix and the error vector corresponding to the line.

Definition at line 766 of file vpMbtDistanceLine.cpp.

References vpLine::changeFrame(), vpFeatureBuilder::create(), error, vpCameraParameters::get_px(), vpCameraParameters::get_py(), vpCameraParameters::get_u0(), vpCameraParameters::get_v0(), vpFeatureLine::getRho(), vpFeatureLine::getTheta(), vpFeatureLine::interaction(), isvisible, vpMeSite::j, line, meline, and vpLine::projection().

Referenced by vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSFirstPhaseFactor(), vpMbEdgeTracker::computeVVSSecondPhase(), vpMbEdgeKltTracker::trackFirstLoop(), and vpMbEdgeKltTracker::trackSecondLoop().

void vpMbtDistanceLine::display ( const vpImage< unsigned char > &  I,
const vpHomogeneousMatrix &  cMo,
const vpCameraParameters &  camera,
const vpColor  col,
const unsigned int  thickness = 1,
const bool  displayFullModel = false 
)

Display the line. The 3D line is projected into the image.

Parameters
I: The image.
cMo: Pose used to project the 3D model into the image.
camera: The camera parameters.
col: The desired color.
thickness: The thickness of the line.
displayFullModel: If true, the line is displayed even if it is not visible.

Definition at line 624 of file vpMbtDistanceLine.cpp.

References vpPoint::changeFrame(), vpCameraParameters::computeFov(), vpPolygon3D::computePolygonClipped(), vpMbHiddenFaces< PolygonType >::computeScanLineQuery(), vpMeterPixelConversion::convertPoint(), vpDisplay::displayLine(), vpPolygon3D::DOWN_CLIPPING, vpPolygon3D::FAR_CLIPPING, vpPolygon3D::getClipping(), vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), hiddenface, isvisible, vpPolygon3D::LEFT_CLIPPING, vpPolygon3D::NEAR_CLIPPING, p1, p2, vpPolygon3D::polyClipped, vpPolygon3D::RIGHT_CLIPPING, vpPolygon3D::UP_CLIPPING, and useScanLine.

void vpMbtDistanceLine::display ( const vpImage< vpRGBa > &  I,
const vpHomogeneousMatrix &  cMo,
const vpCameraParameters &  camera,
const vpColor  col,
const unsigned int  thickness = 1,
const bool  displayFullModel = false 
)

Display the line. The 3D line is projected into the image.

Parameters
I: The image.
cMo: Pose used to project the 3D model into the image.
camera: The camera parameters.
col: The desired color.
thickness: The thickness of the line.
displayFullModel: If true, the line is displayed even if it is not visible.

Definition at line 679 of file vpMbtDistanceLine.cpp.

References vpPoint::changeFrame(), vpCameraParameters::computeFov(), vpPolygon3D::computePolygonClipped(), vpMbHiddenFaces< PolygonType >::computeScanLineQuery(), vpMeterPixelConversion::convertPoint(), vpDisplay::displayLine(), vpPolygon3D::DOWN_CLIPPING, vpPolygon3D::FAR_CLIPPING, vpPolygon3D::getClipping(), vpImage< Type >::getHeight(), vpImage< Type >::getWidth(), hiddenface, isvisible, vpPolygon3D::LEFT_CLIPPING, vpPolygon3D::NEAR_CLIPPING, p1, p2, vpPolygon3D::polyClipped, vpPolygon3D::RIGHT_CLIPPING, vpPolygon3D::UP_CLIPPING, and useScanLine.

void vpMbtDistanceLine::displayMovingEdges ( const vpImage< unsigned char > &  I)

Enable to display the points along the line with a color corresponding to their state.

  • If green : The vpMeSite is a good point.
  • If blue : The point is removed because of the vpMeSite tracking phase (constrast problem).
  • If purple : The point is removed because of the vpMeSite tracking phase (threshold problem).
  • If blue : The point is removed because of the robust method in the virtual visual servoing.
Parameters
I: The image.

Definition at line 735 of file vpMbtDistanceLine.cpp.

References meline.

Referenced by vpMbEdgeTracker::displayFeaturesOnImage(), and vpMbEdgeKltTracker::postTracking().

void vpMbtDistanceLine::getCameraParameters ( vpCameraParameters &  camera) const
inline

Get the camera paramters.

Parameters
camera: The vpCameraParameters used to store the camera parameters.

Definition at line 147 of file vpMbtDistanceLine.h.

unsigned int vpMbtDistanceLine::getIndex ( ) const
inline

Get the index of the line.

Returns
Return the index of the line.

Definition at line 154 of file vpMbtDistanceLine.h.

double vpMbtDistanceLine::getMeanWeight ( ) const
inline

Get the mean weight of the line. The mean weight is computed thanks to the weight of each moving edge. Those weights are computed by the robust estimation method used during the virtual visual servoing.

Returns
The mean weight of the line.

Definition at line 162 of file vpMbtDistanceLine.h.

std::string vpMbtDistanceLine::getName ( ) const
inline

Get the name of the line.

Returns
Return the name of the line

Definition at line 169 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::removeLine().

vpMbtPolygon& vpMbtDistanceLine::getPolygon ( )
inline

Get the polygon associated to the line.

Returns
poly.

Definition at line 176 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine(), vpMbEdgeTracker::setClipping(), vpMbEdgeTracker::setFarClippingDistance(), and vpMbEdgeTracker::setNearClippingDistance().

void vpMbtDistanceLine::initInteractionMatrixError ( )

Initialize the size of the interaction matrix and the error vector.

Definition at line 748 of file vpMbtDistanceLine.cpp.

References error, isvisible, meline, nbFeature, nbFeatureTotal, and vpColVector::resize().

Referenced by vpMbEdgeKltTracker::initMbtTracking(), and vpMbEdgeTracker::initMbtTracking().

bool vpMbtDistanceLine::initMovingEdge ( const vpImage< unsigned char > &  I,
const vpHomogeneousMatrix &  cMo 
)

Initialize the moving edge thanks to a given pose of the camera. The 3D model is projected into the image to create moving edges along the line.

Parameters
I: The image.
cMo: The pose of the camera used to initialize the moving edges.
Returns
false if an error occur, true otherwise.

Definition at line 317 of file vpMbtDistanceLine.cpp.

References vpPoint::changeFrame(), vpLine::changeFrame(), vpCameraParameters::computeFov(), vpPolygon3D::computePolygonClipped(), vpMbHiddenFaces< PolygonType >::computeScanLineQuery(), vpMeterPixelConversion::convertLine(), vpMeterPixelConversion::convertPoint(), vpImagePoint::get_i(), vpImagePoint::get_j(), vpPolygon3D::getClipping(), vpImage< Type >::getHeight(), vpLine::getRho(), vpLine::getTheta(), vpImage< Type >::getWidth(), hiddenface, isvisible, line, meline, nbFeature, nbFeatureTotal, p1, p2, vpPolygon3D::polyClipped, vpLine::projection(), and useScanLine.

Referenced by vpMbEdgeTracker::initMovingEdge(), reinitMovingEdge(), and vpMbEdgeTracker::trackMovingEdge().

bool vpMbtDistanceLine::isTracked ( ) const
inline

Return if the line is used for tracking.

Returns
True if it is used, False otherwise.

Definition at line 187 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::computeProjectionError(), vpMbEdgeTracker::displayFeaturesOnImage(), vpMbEdgeTracker::getNbPoints(), vpMbEdgeKltTracker::initMbtTracking(), vpMbEdgeTracker::initMbtTracking(), vpMbEdgeTracker::initMovingEdge(), vpMbEdgeKltTracker::postTracking(), vpMbEdgeTracker::testTracking(), and vpMbEdgeTracker::trackMovingEdge().

bool vpMbtDistanceLine::isVisible ( ) const
inline

Check if the line is visible in the image or not.

Returns
Return true if the line is visible

Definition at line 194 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::computeProjectionError(), vpMbEdgeTracker::displayFeaturesOnImage(), vpMbEdgeTracker::getNbPoints(), vpMbEdgeKltTracker::initMbtTracking(), vpMbEdgeTracker::initMbtTracking(), vpMbEdgeKltTracker::postTracking(), vpMbEdgeTracker::reinitMovingEdge(), vpMbEdgeTracker::testTracking(), vpMbEdgeTracker::trackMovingEdge(), and vpMbEdgeTracker::updateMovingEdge().

void vpMbtDistanceLine::reinitMovingEdge ( const vpImage< unsigned char > &  I,
const vpHomogeneousMatrix &  cMo 
)

Reinitialize the line if it is required.

A line is reinitialized if the 2D line do not match enough with the projected 3D line.

Parameters
I: the image.
cMo: The pose of the camera.

Definition at line 596 of file vpMbtDistanceLine.cpp.

References initMovingEdge(), meline, nbFeature, nbFeatureTotal, and Reinit.

Referenced by vpMbEdgeTracker::reInitLevel(), and vpMbEdgeTracker::reinitMovingEdge().

void vpMbtDistanceLine::setCameraParameters ( const vpCameraParameters &  camera)
inline

Set the camera paramters.

Parameters
camera: The camera parameters.

Definition at line 202 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine().

void vpMbtDistanceLine::setIndex ( const unsigned int  i)
inline

Set the index of the line.

Parameters
i: The index number

Definition at line 209 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine().

void vpMbtDistanceLine::setMeanWeight ( const double  w_mean)
inline

Set the mean weight of the line.

Parameters
w_mean: The mean weight of the line.

Definition at line 216 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeKltTracker::postTrackingMbt(), and vpMbEdgeTracker::updateMovingEdgeWeights().

void vpMbtDistanceLine::setMovingEdge ( vpMe *  _me)

Set the moving edge parameters.

Parameters
_me: an instance of vpMe containing all the desired parameters

Definition at line 292 of file vpMbtDistanceLine.cpp.

References meline.

Referenced by vpMbEdgeTracker::addLine(), and vpMbEdgeTracker::setMovingEdge().

void vpMbtDistanceLine::setName ( const std::string  line_name)
inline

Set the name of the line.

Parameters
line_name: The name of the line.

Definition at line 225 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine().

void vpMbtDistanceLine::setName ( const char *  line_name)
inline

Set the name of the line.

Parameters
line_name: The name of the line.

Definition at line 232 of file vpMbtDistanceLine.h.

void vpMbtDistanceLine::setTracked ( const std::string &  polyname,
const bool &  track 
)

Set if the line has to considered during tracking phase. Line won't be considered if all of its polygons are desactivated.

Parameters
polyname: name of the polygons that have to be modified.
track: True if the polygon has to be tracked, False otherwise.

Definition at line 237 of file vpMbtDistanceLine.cpp.

References hiddenface, Lindex_polygon, Lindex_polygon_tracked, and updateTracked().

void vpMbtDistanceLine::setVisible ( bool  _isvisible)
inline

Set a boolean parameter to indicates if the line is visible in the image or not.

Parameters
_isvisible: Set to true if the line is visible

Definition at line 241 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::initMovingEdge().

void vpMbtDistanceLine::trackMovingEdge ( const vpImage< unsigned char > &  I,
const vpHomogeneousMatrix &  cMo 
)

Track the moving edges in the image.

Parameters
I: the image.
cMo: The pose of the camera.

Definition at line 429 of file vpMbtDistanceLine.cpp.

References isvisible, meline, nbFeature, nbFeatureTotal, and Reinit.

Referenced by vpMbEdgeTracker::trackMovingEdge().

void vpMbtDistanceLine::updateMovingEdge ( const vpImage< unsigned char > &  I,
const vpHomogeneousMatrix &  cMo 
)

Update the moving edges internal parameters.

Parameters
I: the image.
cMo: The pose of the camera.

Definition at line 483 of file vpMbtDistanceLine.cpp.

References vpPoint::changeFrame(), vpLine::changeFrame(), vpCameraParameters::computeFov(), vpPolygon3D::computePolygonClipped(), vpMbHiddenFaces< PolygonType >::computeScanLineQuery(), vpMeterPixelConversion::convertLine(), vpMeterPixelConversion::convertPoint(), vpImagePoint::get_i(), vpImagePoint::get_j(), vpPolygon3D::getClipping(), vpImage< Type >::getHeight(), vpLine::getRho(), vpLine::getTheta(), vpImage< Type >::getWidth(), hiddenface, isvisible, line, meline, nbFeature, nbFeatureTotal, p1, p2, vpPolygon3D::polyClipped, vpLine::projection(), Reinit, and useScanLine.

Referenced by vpMbEdgeTracker::updateMovingEdge().

void vpMbtDistanceLine::updateTracked ( )

Update the boolean specifying if the line has to be tracked. It takes into account the desactivated polygons and the visibility of the others.

Definition at line 268 of file vpMbtDistanceLine.cpp.

References hiddenface, Lindex_polygon, and Lindex_polygon_tracked.

Referenced by vpMbEdgeTracker::initMovingEdge(), and setTracked().

Member Data Documentation

vpColVector vpMbtDistanceLine::error

The error vector.

Definition at line 94 of file vpMbtDistanceLine.h.

Referenced by computeInteractionMatrixError(), vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSSecondPhase(), initInteractionMatrixError(), and vpMbEdgeKltTracker::trackSecondLoop().

vpMbHiddenFaces<vpMbtPolygon>* vpMbtDistanceLine::hiddenface

Pointer to the list of faces.

Definition at line 103 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine(), vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSFirstPhaseFactor(), display(), initMovingEdge(), vpMbEdgeTracker::initMovingEdge(), setTracked(), vpMbEdgeKltTracker::trackFirstLoop(), updateMovingEdge(), and updateTracked().

bool vpMbtDistanceLine::isvisible

Indicates if the line is visible or not.

Definition at line 109 of file vpMbtDistanceLine.h.

Referenced by closeToImageBorder(), computeInteractionMatrixError(), display(), initInteractionMatrixError(), initMovingEdge(), trackMovingEdge(), and updateMovingEdge().

vpMatrix vpMbtDistanceLine::L

The interaction matrix.

Definition at line 92 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSSecondPhase(), and vpMbEdgeKltTracker::trackSecondLoop().

std::list<int> vpMbtDistanceLine::Lindex_polygon

Index of the faces which contain the line.

Definition at line 105 of file vpMbtDistanceLine.h.

Referenced by addPolygon(), vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSFirstPhaseFactor(), vpMbEdgeTracker::initMovingEdge(), setTracked(), vpMbEdgeKltTracker::trackFirstLoop(), and updateTracked().

std::vector<bool> vpMbtDistanceLine::Lindex_polygon_tracked

Vector of bool associated with Lindex_polygon to know if Lindex_polygon[i] is tracked.

Definition at line 107 of file vpMbtDistanceLine.h.

Referenced by addPolygon(), setTracked(), and updateTracked().

vpLine* vpMbtDistanceLine::line

The 3D line.

Definition at line 86 of file vpMbtDistanceLine.h.

Referenced by buildFrom(), computeInteractionMatrixError(), initMovingEdge(), updateMovingEdge(), and ~vpMbtDistanceLine().

std::vector<vpMbtMeLine*> vpMbtDistanceLine::meline

The moving edge container.

Definition at line 84 of file vpMbtDistanceLine.h.

Referenced by closeToImageBorder(), computeInteractionMatrixError(), vpMbEdgeTracker::computeProjectionError(), vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSFirstPhaseFactor(), displayMovingEdges(), vpMbEdgeTracker::getNbPoints(), initInteractionMatrixError(), initMovingEdge(), vpMbEdgeTracker::initMovingEdge(), vpMbEdgeKltTracker::postTrackingMbt(), reinitMovingEdge(), setMovingEdge(), vpMbEdgeTracker::testTracking(), vpMbEdgeKltTracker::trackFirstLoop(), trackMovingEdge(), vpMbEdgeTracker::trackMovingEdge(), updateMovingEdge(), vpMbEdgeTracker::updateMovingEdgeWeights(), and ~vpMbtDistanceLine().

std::vector<unsigned int> vpMbtDistanceLine::nbFeature

The number of moving edges.

Definition at line 97 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSFirstPhaseFactor(), vpMbEdgeTracker::getNbPoints(), initInteractionMatrixError(), initMovingEdge(), vpMbEdgeTracker::initMovingEdge(), vpMbEdgeKltTracker::postTrackingMbt(), reinitMovingEdge(), vpMbEdgeKltTracker::trackFirstLoop(), trackMovingEdge(), updateMovingEdge(), and vpMbEdgeTracker::updateMovingEdgeWeights().

unsigned int vpMbtDistanceLine::nbFeatureTotal

The number of moving edges.

Definition at line 99 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::computeVVSFirstPhase(), vpMbEdgeTracker::computeVVSSecondPhase(), initInteractionMatrixError(), vpMbEdgeKltTracker::initMbtTracking(), vpMbEdgeTracker::initMbtTracking(), initMovingEdge(), vpMbEdgeTracker::initMovingEdge(), vpMbEdgeKltTracker::postTrackingMbt(), reinitMovingEdge(), trackMovingEdge(), vpMbEdgeKltTracker::trackSecondLoop(), updateMovingEdge(), vpMbEdgeTracker::updateMovingEdge(), and vpMbEdgeTracker::updateMovingEdgeWeights().

vpPoint* vpMbtDistanceLine::p1

The first extremity.

Definition at line 88 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine(), buildFrom(), display(), initMovingEdge(), and updateMovingEdge().

vpPoint* vpMbtDistanceLine::p2

The second extremity.

Definition at line 90 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine(), buildFrom(), display(), initMovingEdge(), and updateMovingEdge().

bool vpMbtDistanceLine::Reinit

Indicates if the line has to be reinitialized.

Definition at line 101 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeKltTracker::postTrackingMbt(), reinitMovingEdge(), vpMbEdgeTracker::reinitMovingEdge(), trackMovingEdge(), updateMovingEdge(), vpMbEdgeTracker::updateMovingEdge(), and vpMbEdgeTracker::updateMovingEdgeWeights().

bool vpMbtDistanceLine::useScanLine

Use scanline rendering.

Definition at line 81 of file vpMbtDistanceLine.h.

Referenced by vpMbEdgeTracker::addLine(), display(), initMovingEdge(), and updateMovingEdge().