cv::ximgproc::EdgeDrawing Class Reference

Class implementing the ED (EdgeDrawing) [248], EDLines [4], EDPF [5] and EDCircles [6] algorithms. More...

#include <opencv2/ximgproc/edge_drawing.hpp>

Inheritance diagram for cv::ximgproc::EdgeDrawing:

Classes
struct	Params

Public Types
enum	GradientOperator {   PREWITT = 0,   SOBEL = 1,   SCHARR = 2,   LSD = 3 }

Public Member Functions
virtual	~EdgeDrawing ()
virtual void	detectEdges (InputArray src)=0
	Detects edges and prepares them to detect lines and ellipses. More...
virtual void	detectEllipses (OutputArray ellipses)=0
	Detects circles and ellipses. More...
virtual void	detectLines (OutputArray lines)=0
	Detects lines. More...
virtual void	getEdgeImage (OutputArray dst)=0
virtual void	getGradientImage (OutputArray dst)=0
virtual std::vector< std::vector< Point > >	getSegments ()=0
void	setParams (const EdgeDrawing::Params &parameters)
	sets parameters. More...
Public Member Functions inherited from cv::Algorithm
	Algorithm ()
virtual	~Algorithm ()
virtual void	clear ()
	Clears the algorithm state. More...
virtual bool	empty () const
	Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read. More...
virtual String	getDefaultName () const
virtual void	read (const FileNode &fn)
	Reads algorithm parameters from a file storage. More...
virtual void	save (const String &filename) const
virtual void	write (FileStorage &fs) const
	Stores algorithm parameters in a file storage. More...
void	write (const Ptr< FileStorage > &fs, const String &name=String()) const
	simplified API for language bindings This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...

Public Attributes
Params	params

Additional Inherited Members
Static Public Member Functions inherited from cv::Algorithm
template<typename _Tp >
static Ptr< _Tp >	load (const String &filename, const String &objname=String())
	Loads algorithm from the file. More...
template<typename _Tp >
static Ptr< _Tp >	loadFromString (const String &strModel, const String &objname=String())
	Loads algorithm from a String. More...
template<typename _Tp >
static Ptr< _Tp >	read (const FileNode &fn)
	Reads algorithm from the file node. More...
Protected Member Functions inherited from cv::Algorithm
void	writeFormat (FileStorage &fs) const

Detailed Description

Class implementing the ED (EdgeDrawing) [248], EDLines [4], EDPF [5] and EDCircles [6] algorithms.

EDGE DRAWING LIBRARY FOR GEOMETRIC FEATURE EXTRACTION AND VALIDATION

Edge Drawing (ED) algorithm is an proactive approach on edge detection problem. In contrast to many other existing edge detection algorithms which follow a subtractive approach (i.e. after applying gradient filters onto an image eliminating pixels w.r.t. several rules, e.g. non-maximal suppression and hysteresis in Canny), ED algorithm works via an additive strategy, i.e. it picks edge pixels one by one, hence the name Edge Drawing. Then we process those random shaped edge segments to extract higher level edge features, i.e. lines, circles, ellipses, etc. The popular method of extraction edge pixels from the thresholded gradient magnitudes is non-maximal supressiun that tests every pixel whether it has the maximum gradient response along its gradient direction and eliminates if it does not. However, this method does not check status of the neighboring pixels, and therefore might result low quality (in terms of edge continuity, smoothness, thinness, localization) edge segments. Instead of non-maximal supression, ED points a set of edge pixels and join them by maximizing the total gradient response of edge segments. Therefore it can extract high quality edge segments without need for an additional hysteresis step.

Member Enumeration Documentation

GradientOperator

enum cv::ximgproc::EdgeDrawing::GradientOperator

Enumerator
PREWITT
SOBEL
SCHARR
LSD

Constructor & Destructor Documentation

~EdgeDrawing()

virtual cv::ximgproc::EdgeDrawing::~EdgeDrawing ( )

inlinevirtual

Member Function Documentation

detectEdges()

virtual void cv::ximgproc::EdgeDrawing::detectEdges ( InputArray  src )

pure virtual

Python:
	None	=	cv.ximgproc_EdgeDrawing.detectEdges(	src	)

Detects edges and prepares them to detect lines and ellipses.

Parameters

src	input image

detectEllipses()

virtual void cv::ximgproc::EdgeDrawing::detectEllipses ( OutputArray  ellipses )

pure virtual

Python:
	ellipses	=	cv.ximgproc_EdgeDrawing.detectEllipses(	[, ellipses]	)

Detects circles and ellipses.

Parameters

ellipses

output Vec<6d> contains center point and perimeter for circles.

Note

you should call detectEdges() method before call this.

detectLines()

virtual void cv::ximgproc::EdgeDrawing::detectLines ( OutputArray  lines )

pure virtual

Python:
	lines	=	cv.ximgproc_EdgeDrawing.detectLines(	[, lines]	)

Detects lines.

Parameters

lines

output Vec<4f> contains start point and end point of detected lines.

Note

you should call detectEdges() method before call this.

getEdgeImage()

virtual void cv::ximgproc::EdgeDrawing::getEdgeImage ( OutputArray  dst )

pure virtual

Python:
	dst	=	cv.ximgproc_EdgeDrawing.getEdgeImage(	[, dst]	)

getGradientImage()

virtual void cv::ximgproc::EdgeDrawing::getGradientImage ( OutputArray  dst )

pure virtual

Python:
	dst	=	cv.ximgproc_EdgeDrawing.getGradientImage(	[, dst]	)

getSegments()

virtual std::vector<std::vector<Point> > cv::ximgproc::EdgeDrawing::getSegments ( )

pure virtual

Python:
	retval	=	cv.ximgproc_EdgeDrawing.getSegments(		)

setParams()

void cv::ximgproc::EdgeDrawing::setParams

(

const EdgeDrawing::Params &

parameters

)

Python:
	None	=	cv.ximgproc_EdgeDrawing.setParams(	parameters	)

sets parameters.

this function is meant to be used for parameter setting in other languages than c++.

Member Data Documentation

params

Params cv::ximgproc::EdgeDrawing::params

---

The documentation for this class was generated from the following file:

• opencv2/ximgproc/edge_drawing.hpp