VL::Sift::Keypoint Struct Reference

SIFT keypoint. More...

#include <sift.hpp>

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Detailed Description

SIFT keypoint.

A SIFT keypoint is charactedized by a location x,y and a scale sigma. The scale is obtained from the level index s and the octave index o through a simple formula (see the PDF documentation).

In addition to the location, scale indexes and scale, we also store the integer location and level. The integer location is unnormalized, i.e. relative to the resolution of the octave containing the keypoint (octaves are downsampled).

Definition at line 187 of file sift.hpp.

List of all members.

Public Attributes
int	o
	Keypoint octave index.
int	ix
	Keypoint integer X coordinate (unnormalized).
int	iy
	Keypoint integer Y coordinate (unnormalized).
int	is
	Keypoint integer scale indiex.
float_t	x
	Keypoint fractional X coordinate.
float_t	y
	Keypoint fractional Y coordinate.
float_t	s
	Keypoint fractional scale index.
float_t	sigma
	Keypoint scale.

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Member Data Documentation

int VL::Sift::Keypoint::is

Keypoint integer scale indiex.

Definition at line 193 of file sift.hpp.

Referenced by VL::Sift::computeKeypointDescriptor(), VL::Sift::computeKeypointOrientations(), VL::Sift::detectKeypoints(), VL::Sift::getKeypoint(), and siftdriver().

int VL::Sift::Keypoint::ix

Keypoint integer X coordinate (unnormalized).

Definition at line 191 of file sift.hpp.

Referenced by VL::Sift::detectKeypoints(), and VL::Sift::getKeypoint().

int VL::Sift::Keypoint::iy

Keypoint integer Y coordinate (unnormalized).

Definition at line 192 of file sift.hpp.

Referenced by VL::Sift::detectKeypoints(), and VL::Sift::getKeypoint().

int VL::Sift::Keypoint::o

Keypoint octave index.

Definition at line 189 of file sift.hpp.

Referenced by VL::Sift::computeKeypointDescriptor(), VL::Sift::computeKeypointOrientations(), VL::Sift::getKeypoint(), and siftdriver().

float_t VL::Sift::Keypoint::s

Keypoint fractional scale index.

Definition at line 197 of file sift.hpp.

Referenced by VL::Sift::getKeypoint().

float_t VL::Sift::Keypoint::sigma

Keypoint scale.

Definition at line 199 of file sift.hpp.

Referenced by VL::Sift::computeKeypointDescriptor(), VL::Sift::computeKeypointOrientations(), VL::Sift::getKeypoint(), and siftdriver().

float_t VL::Sift::Keypoint::x

Keypoint fractional X coordinate.

Definition at line 195 of file sift.hpp.

Referenced by VL::Sift::computeKeypointDescriptor(), VL::Sift::computeKeypointOrientations(), VL::Sift::getKeypoint(), and siftdriver().

float_t VL::Sift::Keypoint::y

Keypoint fractional Y coordinate.

Definition at line 196 of file sift.hpp.

Referenced by VL::Sift::computeKeypointDescriptor(), VL::Sift::computeKeypointOrientations(), VL::Sift::getKeypoint(), and siftdriver().

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

• sift.hpp