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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 ( int  nOctaveStart,
int  nOctaveEnd 
)

Create octave space.

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

Parameters
nOctaveStartNumber of bottom octave
nOctaveEndNumber of top octave. Should be equal or greater than OctaveStart

Member Function Documentation

void GDALOctaveMap::ComputeMap ( GDALIntegralImage poImg)

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

Parameters
poImgIntegral image instance which provides necessary data
See also
GDALOctaveLayer
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
rowRow of point, which is candidate to be feature point
colColumn of point, which is candidate to be feature point
botBottom octave layer
midMiddle octave layer
topTop octave layer
thresholdThreshold 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

int GDALOctaveMap::octaveEnd

Number of top octave.

Should be equal or greater than OctaveStart


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

Generated for GDAL by doxygen 1.8.8.