DirectGraphicalModels::fex::CGlobalFeatureExtractor Class Reference

Interface class for global feature extraction algorithms. More...

#include <GlobalFeatureExtractor.h>

Inheritance diagram for DirectGraphicalModels::fex::CGlobalFeatureExtractor:

Collaboration diagram for DirectGraphicalModels::fex::CGlobalFeatureExtractor:

Public Member Functions
	CGlobalFeatureExtractor (const Mat &img)
	Constructor. More...
virtual	~CGlobalFeatureExtractor (void)
size_t	getNumLines (int threshold1=100, int threshold2=50) const
	Returns the number of staight lines in the image. More...
size_t	getNumCircles (int threshold1=100, int threshold2=30) const
	Returns the number of circles in the source image. More...
float	getOpacity (void) const
	Returns the weighted-mean transparancy of the source image. More...
float	getVariance (void)
	Retunrs the variance of the source image. More...
int	getArea (void)
	Returns the number of non-zero pixels in the source image. More...
int	getPerimeter (void)
	Returns the perimeter of an object in the source image. More...
float	getCompactness (void)
	Returns the compactness of the object in the source image. More...
Public Member Functions inherited from DirectGraphicalModels::fex::IFeatureExtractor
	IFeatureExtractor (const Mat &img)
	Constructor. More...
virtual	~IFeatureExtractor (void)

Additional Inherited Members
Protected Attributes inherited from DirectGraphicalModels::fex::IFeatureExtractor
const Mat	m_img
	Container for the image, from which the features are to be extracted. More...

Detailed Description

Interface class for global feature extraction algorithms.

The derived algorithms are supposed to extract one feature per image

Author

Sergey G. Kosov, serge.nosp@m.y.ko.nosp@m.sov@p.nosp@m.roje.nosp@m.ct-10.nosp@m..de

Definition at line 17 of file GlobalFeatureExtractor.h.

Constructor & Destructor Documentation

CGlobalFeatureExtractor()

DirectGraphicalModels::fex::CGlobalFeatureExtractor::CGlobalFeatureExtractor ( const Mat &  img )

inline

Constructor.

Parameters

img	Input image.

Definition at line 24 of file GlobalFeatureExtractor.h.

~CGlobalFeatureExtractor()

virtual DirectGraphicalModels::fex::CGlobalFeatureExtractor::~CGlobalFeatureExtractor ( void  )

inlinevirtual

Definition at line 25 of file GlobalFeatureExtractor.h.

Member Function Documentation

getArea()

int DirectGraphicalModels::fex::CGlobalFeatureExtractor::getArea ( void  )

inline

Returns the number of non-zero pixels in the source image.

Returns

The number of non-zero pixels in the source image.

Definition at line 58 of file GlobalFeatureExtractor.h.

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getCompactness()

float DirectGraphicalModels::fex::CGlobalFeatureExtractor::getCompactness ( void  )

inline

Returns the compactness of the object in the source image.

The compactness is calculates as follows: \(\frac{P^2}{4\Pi S}\), where P and S are perimeter and area of the object, respectively.

Returns

The compactness of the object in the source image.

Definition at line 70 of file GlobalFeatureExtractor.h.

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getNumCircles()

size_t DirectGraphicalModels::fex::CGlobalFeatureExtractor::getNumCircles ( int  threshold1 = 100, int  threshold2 = 30  ) const

inline

Returns the number of circles in the source image.

Parameters

threshold1	The higher threshold of the two, passed to the Canny edge detector (the lower one is twice smaller).
threshold2	The accumulator threshold for the circle centers at the detection stage. The smaller it is, the more false circles may be detected.

Returns

The number of circles in the source image

Definition at line 40 of file GlobalFeatureExtractor.h.

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getNumLines()

size_t DirectGraphicalModels::fex::CGlobalFeatureExtractor::getNumLines ( int  threshold1 = 100, int  threshold2 = 50  ) const

inline

Returns the number of staight lines in the image.

Parameters

threshold1	The higher threshold of the two, passed to the Canny edge detector(the lower one is twice smaller).
threshold2	The accumulator threshold parameter.Only those lines are detected that get enough votes(> threshold2).

Returns

The number of staight lines in the source image

Definition at line 33 of file GlobalFeatureExtractor.h.

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getOpacity()

float DirectGraphicalModels::fex::CGlobalFeatureExtractor::getOpacity ( void  ) const

inline

Returns the weighted-mean transparancy of the source image.

The weighted-mean transparancy is evaluated as follows:

\[ \frac{1}{width \times hight} \sum^{width}_{x = 1}\sum^{height}_{y = 1} (1 - d_{x,y}) \cdot (img_{x,y} - \mu), \]

where \(d_{x,y}\) is the normalized distance between a position \((x,y)\) and the image center.

Returns

The weighted-mean transparancy of the source image.

Definition at line 48 of file GlobalFeatureExtractor.h.

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getPerimeter()

int DirectGraphicalModels::fex::CGlobalFeatureExtractor::getPerimeter ( void  )

inline

Returns the perimeter of an object in the source image.

This function retunrs the number of edge pixels, assuming a pixel to belong to an edge if any of its neighboring pixels have different value.

Returns

The number of edge pixels in the source image.

Definition at line 64 of file GlobalFeatureExtractor.h.

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getVariance()

float DirectGraphicalModels::fex::CGlobalFeatureExtractor::getVariance ( void  )

inline

Retunrs the variance of the source image.

Returns

The variance of the source image

Definition at line 53 of file GlobalFeatureExtractor.h.

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

• D:/Projects/DGM/modules/FEX/GlobalFeatureExtractor.h