GDALOctaveMap Class Reference

Class for handling octave layers in SURF-based algorithm. More...

#include <gdal_simplesurf.h>

Public Member Functions
	GDALOctaveMap (int nOctaveStart, int nOctaveEnd)
	Create octave space. More...
void	ComputeMap (GDALIntegralImage *poImg)
	Calculate Hessian values for octave space (for all stored octave layers) using specified integral image. More...

Static Public Member Functions
static bool	PointIsExtremum (int row, int col, GDALOctaveLayer *bot, GDALOctaveLayer *mid, GDALOctaveLayer *top, double threshold)
	Method makes decision that specified point in middle octave layer is maximum among all points from 3x3x3 neighbourhood (surrounding points in bottom, middle and top layers). More...

Public Attributes
GDALOctaveLayer ***	pMap
	2-dimensional array of octave layers
int	octaveStart
	Number of bottom octave.
int	octaveEnd
	Number of top octave. More...

Static Public Attributes
static const int	INTERVALS = 4
	Value for constructing internal octave space.

Detailed Description

Class for handling octave layers in SURF-based algorithm.

Author

Andrew Migal migal.nosp@m..dre.nosp@m.w@gma.nosp@m.il.c.nosp@m.om

Class contains OctaveLayers and provides capability to construct octave space and distinguish feature points. Normally this class is used only by SURF-based algorithm.

Constructor & Destructor Documentation

GDALOctaveMap()

GDALOctaveMap::GDALOctaveMap	(	int	nOctaveStart,
		int	nOctaveEnd
	)

Create octave space.

Octave numbers are start with one. (1, 2, 3, 4, ... )

Parameters

nOctaveStart	Number of bottom octave
nOctaveEnd	Number of top octave. Should be equal or greater than OctaveStart

Member Function Documentation

ComputeMap()

void GDALOctaveMap::ComputeMap

(

GDALIntegralImage *

poImg

)

Calculate Hessian values for octave space (for all stored octave layers) using specified integral image.

Parameters

poImg

Integral image instance which provides necessary data

See also

GDALOctaveLayer

PointIsExtremum()

bool GDALOctaveMap::PointIsExtremum ( int  row, int  col, GDALOctaveLayer *  bot, GDALOctaveLayer *  mid, GDALOctaveLayer *  top, double  threshold  )

static

Method makes decision that specified point in middle octave layer is maximum among all points from 3x3x3 neighbourhood (surrounding points in bottom, middle and top layers).

Provided layers should be from the same octave's interval. Detects feature points.

Parameters

row	Row of point, which is candidate to be feature point
col	Column of point, which is candidate to be feature point
bot	Bottom octave layer
mid	Middle octave layer
top	Top octave layer
threshold	Threshold for feature point recognition. Detected feature point will have Hessian value greater than this provided threshold.

Returns

TRUE if candidate was evaluated as feature point or FALSE otherwise.

Member Data Documentation

octaveEnd

int GDALOctaveMap::octaveEnd

Number of top octave.

Should be equal or greater than OctaveStart

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

• gdal_simplesurf.h
• gdal_octave.cpp