Maximally stable extremal region extractor. More...

#include <opencv2/features2d.hpp>

Inheritance diagram for cv::MSER:

Public Member Functions
virtual void	detectRegions (InputArray image, std::vector< std::vector< Point > > &msers, std::vector< Rect > &bboxes)=0
	Detect MSER regions. More...

virtual String	getDefaultName () const CV_OVERRIDE

virtual int	getDelta () const =0

virtual int	getMaxArea () const =0

virtual int	getMinArea () const =0

virtual bool	getPass2Only () const =0

virtual void	setDelta (int delta)=0

virtual void	setMaxArea (int maxArea)=0

virtual void	setMinArea (int minArea)=0

virtual void	setPass2Only (bool f)=0

Public Member Functions inherited from cv::Feature2D
virtual	~Feature2D ()

virtual void	compute (InputArray image, std::vector< KeyPoint > &keypoints, OutputArray descriptors)
	Computes the descriptors for a set of keypoints detected in an image (first variant) or image set (second variant). More...

virtual void	compute (InputArrayOfArrays images, std::vector< std::vector< KeyPoint > > &keypoints, OutputArrayOfArrays descriptors)

virtual int	defaultNorm () const

virtual int	descriptorSize () const

virtual int	descriptorType () const

virtual void	detect (InputArray image, std::vector< KeyPoint > &keypoints, InputArray mask=noArray())
	Detects keypoints in an image (first variant) or image set (second variant). More...

virtual void	detect (InputArrayOfArrays images, std::vector< std::vector< KeyPoint > > &keypoints, InputArrayOfArrays masks=noArray())

virtual void	detectAndCompute (InputArray image, InputArray mask, std::vector< KeyPoint > &keypoints, OutputArray descriptors, bool useProvidedKeypoints=false)

virtual bool	empty () const CV_OVERRIDE
	Return true if detector object is empty. More...

void	read (const String &fileName)

virtual void	read (const FileNode &) CV_OVERRIDE
	Reads algorithm parameters from a file storage. More...

void	write (const String &fileName) const

virtual void	write (FileStorage &) const CV_OVERRIDE
	Stores algorithm parameters in a file storage. More...

void	write (const Ptr< FileStorage > &fs, const String &name=String()) const

Public Member Functions inherited from cv::Algorithm
	Algorithm ()

virtual	~Algorithm ()

virtual void	clear ()
	Clears the algorithm state. More...

virtual void	save (const String &filename) const

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...

Static Public Member Functions
static Ptr< MSER >	create (int _delta=5, int _min_area=60, int _max_area=14400, double _max_variation=0.25, double _min_diversity=.2, int _max_evolution=200, double _area_threshold=1.01, double _min_margin=0.003, int _edge_blur_size=5)
	Full constructor for MSER detector. More...

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...

Additional Inherited Members
Protected Member Functions inherited from cv::Algorithm
void	writeFormat (FileStorage &fs) const

Detailed Description

Maximally stable extremal region extractor.

The class encapsulates all the parameters of the MSER extraction algorithm (see wiki article).

there are two different implementation of MSER: one for grey image, one for color image
the grey image algorithm is taken from: [157] ; the paper claims to be faster than union-find method; it actually get 1.5~2m/s on my centrino L7200 1.2GHz laptop.
the color image algorithm is taken from: [71] ; it should be much slower than grey image method ( 3~4 times ); the chi_table.h file is taken directly from paper's source code which is distributed under GPL.
(Python) A complete example showing the use of the MSER detector can be found at samples/python/mser.py

Member Function Documentation

◆ create()

static Ptr<MSER> cv::MSER::create	(	int	_delta = `5`,
		int	_min_area = `60`,
		int	_max_area = `14400`,
		double	_max_variation = `0.25`,
		double	_min_diversity = `.2`,
		int	_max_evolution = `200`,
		double	_area_threshold = `1.01`,
		double	_min_margin = `0.003`,
		int	_edge_blur_size = `5`
	)

static

Python:
	retval	=	cv.MSER_create(	[, _delta[, _min_area[, _max_area[, _max_variation[, _min_diversity[, _max_evolution[, _area_threshold[, _min_margin[, _edge_blur_size]]]]]]]]]	)

Full constructor for MSER detector.

Parameters

_delta	it compares \((size_{i}-size_{i-delta})/size_{i-delta}\)
_min_area	prune the area which smaller than minArea
_max_area	prune the area which bigger than maxArea
_max_variation	prune the area have similar size to its children
_min_diversity	for color image, trace back to cut off mser with diversity less than min_diversity
_max_evolution	for color image, the evolution steps
_area_threshold	for color image, the area threshold to cause re-initialize
_min_margin	for color image, ignore too small margin
_edge_blur_size	for color image, the aperture size for edge blur

◆ detectRegions()

virtual void cv::MSER::detectRegions	(	InputArray	image,
		std::vector< std::vector< Point > > &	msers,
		std::vector< Rect > &	bboxes
	)

pure virtual

Python:
	msers, bboxes	=	cv.MSER.detectRegions(	image	)

Detect MSER regions.

Parameters

image	input image (8UC1, 8UC3 or 8UC4, must be greater or equal than 3x3)
msers	resulting list of point sets
bboxes	resulting bounding boxes

◆ getDefaultName()

virtual String cv::MSER::getDefaultName ( ) const

virtual

Python:
	retval	=	cv.MSER.getDefaultName(		)

Returns the algorithm string identifier. This string is used as top level xml/yml node tag when the object is saved to a file or string.

Reimplemented from cv::Feature2D.

◆ getDelta()

virtual int cv::MSER::getDelta ( ) const

pure virtual

Python:
	retval	=	cv.MSER.getDelta(		)

◆ getMaxArea()

virtual int cv::MSER::getMaxArea ( ) const

pure virtual

Python:
	retval	=	cv.MSER.getMaxArea(		)

◆ getMinArea()

virtual int cv::MSER::getMinArea ( ) const

pure virtual

Python:
	retval	=	cv.MSER.getMinArea(		)

◆ getPass2Only()

virtual bool cv::MSER::getPass2Only ( ) const

pure virtual

Python:
	retval	=	cv.MSER.getPass2Only(		)

◆ setDelta()

virtual void cv::MSER::setDelta ( int delta )

pure virtual

Python:
	None	=	cv.MSER.setDelta(	delta	)

◆ setMaxArea()

virtual void cv::MSER::setMaxArea ( int maxArea )

pure virtual

Python:
	None	=	cv.MSER.setMaxArea(	maxArea	)

◆ setMinArea()

virtual void cv::MSER::setMinArea ( int minArea )

pure virtual

Python:
	None	=	cv.MSER.setMinArea(	minArea	)

◆ setPass2Only()

virtual void cv::MSER::setPass2Only ( bool f )

pure virtual

Python:
	None	=	cv.MSER.setPass2Only(	f	)

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

opencv2/features2d.hpp

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ create()

◆ detectRegions()

◆ getDefaultName()

◆ getDelta()

◆ getMaxArea()

◆ getMinArea()

◆ getPass2Only()

◆ setDelta()

◆ setMaxArea()

◆ setMinArea()

◆ setPass2Only()