#include <features2d.hpp>

Inheritance diagram for cv::SIFT:

Public Member Functions
	SIFT (int nfeatures=0, int nOctaveLayers=3, double contrastThreshold=0.04, double edgeThreshold=10, double sigma=1.6)

int	descriptorSize () const
	returns the descriptor size in floats (128) More...

int	descriptorType () const
	returns the descriptor type More...

void	operator() (InputArray img, InputArray mask, vector< KeyPoint > &keypoints) const
	finds the keypoints using SIFT algorithm More...

void	operator() (InputArray img, InputArray mask, vector< KeyPoint > &keypoints, OutputArray descriptors, bool useProvidedKeypoints=false) const

AlgorithmInfo *	info () const

void	buildGaussianPyramid (const Mat &base, vector< Mat > &pyr, int nOctaves) const

void	buildDoGPyramid (const vector< Mat > &pyr, vector< Mat > &dogpyr) const

void	findScaleSpaceExtrema (const vector< Mat > &gauss_pyr, const vector< Mat > &dog_pyr, vector< KeyPoint > &keypoints) const

Public Member Functions inherited from cv::Feature2D
virtual void	operator() (InputArray image, InputArray mask, CV_OUT vector< KeyPoint > &keypoints, OutputArray descriptors, bool useProvidedKeypoints=false) const =0

void	compute (const Mat &image, CV_OUT CV_IN_OUT std::vector< KeyPoint > &keypoints, CV_OUT Mat &descriptors) const

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

void	detect (const Mat &image, CV_OUT vector< KeyPoint > &keypoints, const Mat &mask=Mat()) const

void	detect (const vector< Mat > &images, vector< vector< KeyPoint > > &keypoints, const vector< Mat > &masks=vector< Mat >()) const

virtual bool	empty () const

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

virtual	~Algorithm ()

string	name () const

template<typename _Tp >
ParamType< _Tp >::member_type	get (const string &name) const

template<typename _Tp >
ParamType< _Tp >::member_type	get (const char *name) const

int	getInt (const string &name) const

double	getDouble (const string &name) const

bool	getBool (const string &name) const

string	getString (const string &name) const

Mat	getMat (const string &name) const

vector< Mat >	getMatVector (const string &name) const

Ptr< Algorithm >	getAlgorithm (const string &name) const

void	set (const string &name, int value)

void	set (const string &name, double value)

void	set (const string &name, bool value)

void	set (const string &name, const string &value)

void	set (const string &name, const Mat &value)

void	set (const string &name, const vector< Mat > &value)

void	set (const string &name, const Ptr< Algorithm > &value)

template<typename _Tp >
void	set (const string &name, const Ptr< _Tp > &value)

void	setInt (const string &name, int value)

void	setDouble (const string &name, double value)

void	setBool (const string &name, bool value)

void	setString (const string &name, const string &value)

void	setMat (const string &name, const Mat &value)

void	setMatVector (const string &name, const vector< Mat > &value)

void	setAlgorithm (const string &name, const Ptr< Algorithm > &value)

template<typename _Tp >
void	setAlgorithm (const string &name, const Ptr< _Tp > &value)

void	set (const char *name, int value)

void	set (const char *name, double value)

void	set (const char *name, bool value)

void	set (const char *name, const string &value)

void	set (const char *name, const Mat &value)

void	set (const char *name, const vector< Mat > &value)

void	set (const char *name, const Ptr< Algorithm > &value)

template<typename _Tp >
void	set (const char *name, const Ptr< _Tp > &value)

void	setInt (const char *name, int value)

void	setDouble (const char *name, double value)

void	setBool (const char *name, bool value)

void	setString (const char *name, const string &value)

void	setMat (const char *name, const Mat &value)

void	setMatVector (const char *name, const vector< Mat > &value)

void	setAlgorithm (const char *name, const Ptr< Algorithm > &value)

template<typename _Tp >
void	setAlgorithm (const char *name, const Ptr< _Tp > &value)

string	paramHelp (const string &name) const

int	paramType (const char *name) const

int	paramType (const string &name) const

void	getParams (CV_OUT vector< string > &names) const

virtual void	write (FileStorage &fs) const

virtual void	read (const FileNode &fn)

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

void	compute (const Mat &image, CV_OUT CV_IN_OUT vector< KeyPoint > &keypoints, CV_OUT Mat &descriptors) const

void	compute (const vector< Mat > &images, vector< vector< KeyPoint > > &keypoints, vector< Mat > &descriptors) const

virtual bool	empty () const

Protected Member Functions
void	detectImpl (const Mat &image, vector< KeyPoint > &keypoints, const Mat &mask=Mat()) const

void	computeImpl (const Mat &image, vector< KeyPoint > &keypoints, Mat &descriptors) const

Protected Attributes
int	nfeatures

int	nOctaveLayers

double	contrastThreshold

double	edgeThreshold

double	sigma

Additional Inherited Members
Public Types inherited from cv::Algorithm
typedef Algorithm (	Constructor) (void)

typedef int(Algorithm::*	Getter) () const

typedef void(Algorithm::*	Setter) (int)

Static Public Member Functions inherited from cv::Feature2D
static Ptr< Feature2D >	create (const string &name)

Static Public Member Functions inherited from cv::FeatureDetector
static Ptr< FeatureDetector >	create (const string &detectorType)

Static Public Member Functions inherited from cv::Algorithm
static void	getList (CV_OUT vector< string > &algorithms)

static Ptr< Algorithm >	_create (const string &name)

template<typename _Tp >
static Ptr< _Tp >	create (const string &name)

Static Public Member Functions inherited from cv::DescriptorExtractor
static Ptr< DescriptorExtractor >	create (const string &descriptorExtractorType)

Static Protected Member Functions inherited from cv::FeatureDetector
static void	removeInvalidPoints (const Mat &mask, vector< KeyPoint > &keypoints)

Static Protected Member Functions inherited from cv::DescriptorExtractor
static void	removeBorderKeypoints (vector< KeyPoint > &keypoints, Size imageSize, int borderSize)

Detailed Description

SIFT implementation.

The class implements SIFT algorithm by D. Lowe.

Constructor & Destructor Documentation

§ SIFT()

cv::SIFT::SIFT	(	int	nfeatures = `0`,
		int	nOctaveLayers = `3`,
		double	contrastThreshold = `0.04`,
		double	edgeThreshold = `10`,
		double	sigma = `1.6`
	)

explicit

Member Function Documentation

§ buildDoGPyramid()

void cv::SIFT::buildDoGPyramid	(	const vector< Mat > &	pyr,
		vector< Mat > &	dogpyr
	)		const

§ buildGaussianPyramid()

void cv::SIFT::buildGaussianPyramid	(	const Mat &	base,
		vector< Mat > &	pyr,
		int	nOctaves
	)		const

§ computeImpl()

void cv::SIFT::computeImpl	(	const Mat &	image,
		vector< KeyPoint > &	keypoints,
		Mat &	descriptors
	)		const

protectedvirtual

Implements cv::DescriptorExtractor.

§ descriptorSize()

int cv::SIFT::descriptorSize ( ) const

virtual

returns the descriptor size in floats (128)

Implements cv::DescriptorExtractor.

§ descriptorType()

int cv::SIFT::descriptorType ( ) const

virtual

returns the descriptor type

Implements cv::DescriptorExtractor.

§ detectImpl()

void cv::SIFT::detectImpl	(	const Mat &	image,
		vector< KeyPoint > &	keypoints,
		const Mat &	mask = `Mat()`
	)		const

protectedvirtual

Implements cv::FeatureDetector.

§ findScaleSpaceExtrema()

void cv::SIFT::findScaleSpaceExtrema	(	const vector< Mat > &	gauss_pyr,
		const vector< Mat > &	dog_pyr,
		vector< KeyPoint > &	keypoints
	)		const

§ info()

AlgorithmInfo* cv::SIFT::info ( ) const

virtual

Reimplemented from cv::Algorithm.

§ operator()() [1/2]

void cv::SIFT::operator()	(	InputArray	img,
		InputArray	mask,
		vector< KeyPoint > &	keypoints
	)		const

finds the keypoints using SIFT algorithm

§ operator()() [2/2]

void cv::SIFT::operator()	(	InputArray	img,
		InputArray	mask,
		vector< KeyPoint > &	keypoints,
		OutputArray	descriptors,
		bool	useProvidedKeypoints = `false`
	)		const

finds the keypoints and computes descriptors for them using SIFT algorithm. Optionally it can compute descriptors for the user-provided keypoints

Member Data Documentation

§ contrastThreshold

double cv::SIFT::contrastThreshold

protected

§ edgeThreshold

double cv::SIFT::edgeThreshold

protected

§ nfeatures

int cv::SIFT::nfeatures

protected

§ nOctaveLayers

int cv::SIFT::nOctaveLayers

protected

§ sigma

double cv::SIFT::sigma

protected

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

nonfree/include/opencv2/nonfree/features2d.hpp

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

§ SIFT()

Member Function Documentation

§ buildDoGPyramid()

§ buildGaussianPyramid()

§ computeImpl()

§ descriptorSize()

§ descriptorType()

§ detectImpl()

§ findScaleSpaceExtrema()

§ info()

§ operator()() [1/2]

§ operator()() [2/2]

Member Data Documentation

§ contrastThreshold

§ edgeThreshold

§ nfeatures

§ nOctaveLayers

§ sigma