cv::xfeatures2d::LATCH Class Reference

#include <opencv2/xfeatures2d.hpp>

Inheritance diagram for cv::xfeatures2d::LATCH:

Public Member Functions
virtual int	getBytes () const =0
String	getDefaultName () const CV_OVERRIDE
virtual int	getHalfSSDsize () const =0
virtual bool	getRotationInvariance () const =0
virtual double	getSigma () const =0
virtual void	setBytes (int bytes)=0
virtual void	setHalfSSDsize (int half_ssd_size)=0
virtual void	setRotationInvariance (bool rotationInvariance)=0
virtual void	setSigma (double sigma)=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).
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).
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.
virtual String	getDefaultName () const CV_OVERRIDE
virtual void	read (const FileNode &) CV_OVERRIDE
	Reads algorithm parameters from a file storage.
void	read (const String &fileName)
void	write (const Ptr< FileStorage > &fs, const String &name) const
void	write (const String &fileName) const
virtual void	write (FileStorage &) const CV_OVERRIDE
	Stores algorithm parameters in a file storage.
void	write (FileStorage &fs, const String &name) const
Public Member Functions inherited from cv::Algorithm
	Algorithm ()
virtual	~Algorithm ()
virtual void	clear ()
	Clears the algorithm state.
virtual bool	empty () const
	Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read.
virtual String	getDefaultName () const
virtual void	read (const FileNode &fn)
	Reads algorithm parameters from a file storage.
virtual void	save (const String &filename) const
void	write (const Ptr< FileStorage > &fs, const String &name=String()) const
virtual void	write (FileStorage &fs) const
	Stores algorithm parameters in a file storage.
void	write (FileStorage &fs, const String &name) const

Static Public Member Functions
static Ptr< LATCH >	create (int bytes=32, bool rotationInvariance=true, int half_ssd_size=3, double sigma=2.0)
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.
template<typename _Tp >
static Ptr< _Tp >	loadFromString (const String &strModel, const String &objname=String())
	Loads algorithm from a String.
template<typename _Tp >
static Ptr< _Tp >	read (const FileNode &fn)
	Reads algorithm from the file node.

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

Detailed Description

latch Class for computing the LATCH descriptor. If you find this code useful, please add a reference to the following paper in your work: Gil Levi and Tal Hassner, "LATCH: Learned Arrangements of Three Patch Codes", arXiv preprint arXiv:1501.03719, 15 Jan. 2015

LATCH is a binary descriptor based on learned comparisons of triplets of image patches.

bytes is the size of the descriptor - can be 64, 32, 16, 8, 4, 2 or 1 rotationInvariance - whether or not the descriptor should compansate for orientation changes. half_ssd_size - the size of half of the mini-patches size. For example, if we would like to compare triplets of patches of size 7x7x then the half_ssd_size should be (7-1)/2 = 3. sigma - sigma value for GaussianBlur smoothing of the source image. Source image will be used without smoothing in case sigma value is 0.

Note: the descriptor can be coupled with any keypoint extractor. The only demand is that if you use set rotationInvariance = True then you will have to use an extractor which estimates the patch orientation (in degrees). Examples for such extractors are ORB and SIFT.

Note: a complete example can be found under /samples/cpp/tutorial_code/xfeatures2D/latch_match.cpp

Member Function Documentation

create()

static Ptr< LATCH > cv::xfeatures2d::LATCH::create ( int  bytes = 32, bool  rotationInvariance = true, int  half_ssd_size = 3, double  sigma = 2.0  )

static

getBytes()

virtual int cv::xfeatures2d::LATCH::getBytes ( ) const

pure virtual

getDefaultName()

String cv::xfeatures2d::LATCH::getDefaultName ( ) const

virtual

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.

getHalfSSDsize()

virtual int cv::xfeatures2d::LATCH::getHalfSSDsize ( ) const

pure virtual

getRotationInvariance()

virtual bool cv::xfeatures2d::LATCH::getRotationInvariance ( ) const

pure virtual

getSigma()

virtual double cv::xfeatures2d::LATCH::getSigma ( ) const

pure virtual

setBytes()

virtual void cv::xfeatures2d::LATCH::setBytes ( int  bytes )

pure virtual

setHalfSSDsize()

virtual void cv::xfeatures2d::LATCH::setHalfSSDsize ( int  half_ssd_size )

pure virtual

setRotationInvariance()

virtual void cv::xfeatures2d::LATCH::setRotationInvariance ( bool  rotationInvariance )

pure virtual

setSigma()

virtual void cv::xfeatures2d::LATCH::setSigma ( double  sigma )

pure virtual

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

• opencv2/xfeatures2d.hpp