HOG (histogram of oriented gradients) feature extraction class. More...

#include <HOG.h>

Inheritance diagram for DirectGraphicalModels::fex::CHOG:

Collaboration diagram for DirectGraphicalModels::fex::CHOG:

Public Member Functions
	CHOG (const Mat &img)
	Constructor. More...

virtual	~CHOG (void)

virtual Mat	get (void) const
	Extracts and returns the required feature. More...

Public Member Functions inherited from DirectGraphicalModels::fex::ILocalFeatureExtractor
	ILocalFeatureExtractor (const Mat &img)
	Constructor. More...

virtual	~ILocalFeatureExtractor (void)

Public Member Functions inherited from DirectGraphicalModels::fex::IFeatureExtractor
	IFeatureExtractor (const Mat &img)
	Constructor. More...

virtual	~IFeatureExtractor (void)

Static Public Member Functions
static Mat	get (const Mat &img, int nBins=9, SqNeighbourhood nbhd=sqNeighbourhood(5))
	Extracts the HOG feature. More...

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

HOG (histogram of oriented gradients) feature extraction class.

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 15 of file HOG.h.

Constructor & Destructor Documentation

◆ CHOG()

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

inline

Constructor.

Parameters

img	Input image of type CV_8UC1 or CV_8UC3.

Definition at line 22 of file HOG.h.

◆ ~CHOG()

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

inlinevirtual

Definition at line 23 of file HOG.h.

Member Function Documentation

◆ get() [1/2]

virtual Mat DirectGraphicalModels::fex::CHOG::get ( void ) const

inlinevirtual

Extracts and returns the required feature.

Returns: The feature image.

Implements DirectGraphicalModels::fex::ILocalFeatureExtractor.

Definition at line 25 of file HOG.h.

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◆ get() [2/2]

Mat DirectGraphicalModels::fex::CHOG::get	(	const Mat &	img,
		int	nBins = `9`,
		SqNeighbourhood	nbhd = `sqNeighbourhood(5)`
	)

static

Extracts the HOG feature.

For each pixel of the source image this function calculates the histogram of oriented gradients inside the pixel's neighbourhood nbhd. The histogram consists of nBins values, it is normalized, and stored as nBins channel image, thus, the channel index corresponds to the histogram index.

Parameters

img	Input image of type CV_8UC1 or CV_8UC3.
nBins	Number of bins. Hence a single bin covers an angle of \(\frac{180^\circ}{nBins}\).
nbhd	Neighborhood around the pixel, where its histogram is estimated. (Ref. SqNeighbourhood).

Returns: The HOG feature image of type CV_8UC{n}, where \(n=nBins\).

Definition at line 7 of file HOG.cpp.

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

D:/Projects/DGM/modules/FEX/HOG.h
D:/Projects/DGM/modules/FEX/HOG.cpp

Public Member Functions

Static Public Member Functions