GDALFeaturePoint Class Reference

Class of "feature point" in raster. More...

#include <gdal_simplesurf.h>

Public Member Functions
	GDALFeaturePoint ()
	Standard constructor. More...
	GDALFeaturePoint (const GDALFeaturePoint &fp)
	Copy constructor. More...
	GDALFeaturePoint (int nX, int nY, int nScale, int nRadius, int nSign)
	Create instance of GDALFeaturePoint class. More...
GDALFeaturePoint &	operator= (const GDALFeaturePoint &point)
	Assignment operator.
double &	operator[] (int nIndex)
	Provide access to point's descriptor. More...
int	GetX () const
	Fetch X-coordinate (pixel) of point. More...
void	SetX (int nX)
	Set X coordinate of point. More...
int	GetY () const
	Fetch Y-coordinate (line) of point. More...
void	SetY (int nY)
	Set Y coordinate of point. More...
int	GetScale () const
	Fetch scale of point. More...
void	SetScale (int nScale)
	Set scale of point. More...
int	GetRadius () const
	Fetch radius of point. More...
void	SetRadius (int nRadius)
	Set radius of point. More...
int	GetSign () const
	Fetch sign of Hessian determinant of point. More...
void	SetSign (int nSign)
	Set sign of point. More...

Static Public Attributes
static const int	DESC_SIZE = 64
	Descriptor length.

Detailed Description

Class of "feature point" in raster.

Used by SURF-based algorithm.

This point presents coordinates of distinctive pixel in image. In computer vision, feature points - the most "strong" and "unique" pixels (or areas) in picture, which can be distinguished from others. For more details, see FAST corner detector, SIFT, SURF and similar algorithms.

Constructor & Destructor Documentation

GDALFeaturePoint() [1/3]

GDALFeaturePoint::GDALFeaturePoint

(

)

Standard constructor.

Initializes all parameters with negative numbers and allocates memory for descriptor.

GDALFeaturePoint() [2/3]

GDALFeaturePoint::GDALFeaturePoint

(

const GDALFeaturePoint &

fp

)

Copy constructor.

Parameters

fp	Copied instance of GDALFeaturePoint class

GDALFeaturePoint() [3/3]

GDALFeaturePoint::GDALFeaturePoint	(	int	nX,
		int	nY,
		int	nScale,
		int	nRadius,
		int	nSign
	)

Create instance of GDALFeaturePoint class.

Parameters

nX	X-coordinate (pixel)
nY	Y-coordinate (line)
nScale	Scale which contains this point (2, 4, 8, 16 and so on)
nRadius	Half of the side of descriptor area
nSign	Sign of Hessian determinant for this point

Note

This constructor normally is invoked by SURF-based algorithm, which provides all necessary parameters.

Member Function Documentation

GetRadius()

int GDALFeaturePoint::GetRadius

(

)

const

Fetch radius of point.

Returns

Radius for this point.

GetScale()

int GDALFeaturePoint::GetScale

(

)

const

Fetch scale of point.

Returns

Scale for this point.

GetSign()

int GDALFeaturePoint::GetSign

(

)

const

Fetch sign of Hessian determinant of point.

Returns

Sign for this point.

GetX()

int GDALFeaturePoint::GetX

(

)

const

Fetch X-coordinate (pixel) of point.

Returns

X-coordinate in pixels

GetY()

int GDALFeaturePoint::GetY

(

)

const

Fetch Y-coordinate (line) of point.

Returns

Y-coordinate in pixels.

operator[]()

double & GDALFeaturePoint::operator[]

(

int

nIndex

)

Provide access to point's descriptor.

Parameters

nIndex

Position of descriptor's value. nIndex should be within range from 0 to DESC_SIZE (in current version - 64)

Returns

Reference to value of descriptor in 'nIndex' position. If index is out of range then behaviour is undefined.

SetRadius()

void GDALFeaturePoint::SetRadius

(

int

nRadius

)

Set radius of point.

Parameters

nRadius

Radius for this point.

SetScale()

void GDALFeaturePoint::SetScale

(

int

nScale

)

Set scale of point.

Parameters

nScale

Scale for this point.

SetSign()

void GDALFeaturePoint::SetSign

(

int

nSign

)

Set sign of point.

Parameters

nSign

Sign of Hessian determinant for this point.

SetX()

void GDALFeaturePoint::SetX

(

int

nX

)

Set X coordinate of point.

Parameters

nX	X coordinate in pixels

SetY()

void GDALFeaturePoint::SetY

(

int

nY

)

Set Y coordinate of point.

Parameters

nY	Y coordinate in pixels.

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

• gdal_simplesurf.h
• gdal_simplesurf.cpp