sfm::Sift Class Reference

Implementation of the SIFT feature detector and descriptor. More...

#include <sift.h>

Classes
struct	Descriptor
	Representation of the SIFT descriptor. More...
struct	Keypoint
	Representation of a SIFT keypoint. More...
struct	Octave
	Representation of a SIFT octave. More...
struct	Options
	SIFT options. More...

Public Types
typedef std::vector< Descriptor >	Descriptors
typedef std::vector< Keypoint >	Keypoints

Public Member Functions
	Sift (Options const &options)
Descriptors const &	get_descriptors (void) const
	Returns the list of descriptors.
Keypoints const &	get_keypoints (void) const
	Returns the list of keypoints.
void	process (void)
	Starts the SIFT keypoint detection and descriptor extraction.
void	set_float_image (mve::FloatImage::ConstPtr img)
	Sets the input image.
void	set_image (mve::ByteImage::ConstPtr img)
	Sets the input image.

Static Public Member Functions
static void	load_lowe_descriptors (std::string const &filename, Descriptors *result)
	Helper function that creates SIFT descriptors from David Lowe's SIFT descriptor files.

Protected Types
typedef std::vector< Octave >	Octaves

Protected Member Functions
void	add_octave (mve::FloatImage::ConstPtr image, float has_sigma, float target_sigma)
void	create_octaves (void)
bool	descriptor_assignment (Keypoint const &kp, Descriptor &desc, Octave const *octave)
void	descriptor_generation (void)
std::size_t	extrema_detection (mve::FloatImage::ConstPtr s[3], int oi, int si)
void	extrema_detection (void)
void	generate_grad_ori_images (Octave *octave)
float	keypoint_absolute_scale (Keypoint const &kp)
void	keypoint_localization (void)
float	keypoint_relative_scale (Keypoint const &kp)
void	orientation_assignment (Keypoint const &kp, Octave const *octave, std::vector< float > &orientations)

Detailed Description

Implementation of the SIFT feature detector and descriptor.

The implementation follows the description of the journal article:

Distinctive Image Features from Scale-Invariant Keypoints, David G. Lowe, International Journal of Computer Vision, 2004.

The implementation used the siftpp implementation as reference for some parts of the algorithm. This implementation is available here:

http://www.vlfeat.org/~vedaldi/code/siftpp.html

Definition at line 42 of file sift.h.

Member Typedef Documentation

Descriptors

typedef std::vector<Descriptor> sfm::Sift::Descriptors

Definition at line 153 of file sift.h.

Keypoints

typedef std::vector<Keypoint> sfm::Sift::Keypoints

Definition at line 152 of file sift.h.

Octaves

typedef std::vector<Octave> sfm::Sift::Octaves

protected

Definition at line 193 of file sift.h.

Constructor & Destructor Documentation

Sift()

sfm::Sift::Sift ( Options const &  options )

explicit

Definition at line 24 of file sift.cc.

Member Function Documentation

add_octave()

void sfm::Sift::add_octave ( mve::FloatImage::ConstPtr  image, float  has_sigma, float  target_sigma  )

protected

Definition at line 213 of file sift.cc.

create_octaves()

void sfm::Sift::create_octaves ( void  )

protected

Definition at line 170 of file sift.cc.

descriptor_assignment()

bool sfm::Sift::descriptor_assignment ( Keypoint const &  kp, Descriptor &  desc, Octave const *  octave  )

protected

Definition at line 702 of file sift.cc.

descriptor_generation()

void sfm::Sift::descriptor_generation ( void  )

protected

Definition at line 491 of file sift.cc.

extrema_detection() [1/2]

std::size_t sfm::Sift::extrema_detection ( mve::FloatImage::ConstPtr  s[3], int  oi, int  si  )

protected

Definition at line 287 of file sift.cc.

extrema_detection() [2/2]

void sfm::Sift::extrema_detection ( void  )

protected

Definition at line 264 of file sift.cc.

generate_grad_ori_images()

void sfm::Sift::generate_grad_ori_images ( Octave *  octave )

protected

Definition at line 558 of file sift.cc.

get_descriptors()

Sift::Descriptors const & sfm::Sift::get_descriptors ( void  ) const

inline

Returns the list of descriptors.

Definition at line 245 of file sift.h.

get_keypoints()

Sift::Keypoints const & sfm::Sift::get_keypoints ( void  ) const

inline

Returns the list of keypoints.

Definition at line 239 of file sift.h.

keypoint_absolute_scale()

float sfm::Sift::keypoint_absolute_scale ( Keypoint const &  kp )

protected

Definition at line 862 of file sift.cc.

keypoint_localization()

void sfm::Sift::keypoint_localization ( void  )

protected

Definition at line 340 of file sift.cc.

keypoint_relative_scale()

float sfm::Sift::keypoint_relative_scale ( Keypoint const &  kp )

protected

Definition at line 855 of file sift.cc.

load_lowe_descriptors()

void sfm::Sift::load_lowe_descriptors ( std::string const &  filename, Descriptors *  result  )

static

Helper function that creates SIFT descriptors from David Lowe's SIFT descriptor files.

Definition at line 871 of file sift.cc.

orientation_assignment()

void sfm::Sift::orientation_assignment ( Keypoint const &  kp, Octave const *  octave, std::vector< float > &  orientations  )

protected

Definition at line 599 of file sift.cc.

process()

void sfm::Sift::process

(

void

)

Starts the SIFT keypoint detection and descriptor extraction.

Definition at line 42 of file sift.cc.

set_float_image()

void sfm::Sift::set_float_image

(

mve::FloatImage::ConstPtr

img

)

Sets the input image.

Definition at line 151 of file sift.cc.

set_image()

void sfm::Sift::set_image

(

mve::ByteImage::ConstPtr

img

)

Sets the input image.

Definition at line 135 of file sift.cc.

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

• /builddir/build/BUILD/mve-354a652461377939ca136f451ba3271a1c52ee65/libs/sfm/sift.h
• /builddir/build/BUILD/mve-354a652461377939ca136f451ba3271a1c52ee65/libs/sfm/sift.cc