lti::ogd1Kernel< T > Class Template Reference

First order Oriented Gaussian Derivative. More...

#include <ltiOgdKernels.h>

Inheritance diagram for lti::ogd1Kernel< T >:

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Collaboration diagram for lti::ogd1Kernel< T >:

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List of all members.

Public Member Functions
	ogd1Kernel ()
	ogd1Kernel (const int &size, const double &theVariance=1.4426950409, const double &theAngle=0.0)
void	generate (const int &size, const double &theVariance, const double &theAngle)
void	generateBasisKernel (const int &whichBasis, const int &size, const double &theVariance)

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Detailed Description

template<class T>
class lti::ogd1Kernel< T >

First order Oriented Gaussian Derivative.

OGD kernels are separable (one filter pair per basis kernel)!

You can create a "real" 2D kernel with the following code

 lti::ogd1Kernel<float> ogd(5); // a kernel 5x5 with default variance
                                 // and angle
 lti::kernel2D<float>   kern;    // a 2D kernel;

 kern.outerProduct(ogd.getRowFilter(0),ogd.getColFilter(0));

The first basis filter of the first order OGD is:

and the second:

The used interpolation functions are and .

If you need to calculate several channels with different directions, calculate first the basis images and then use lti::ogd1Filter to combine them. This way is faster as to convolve each time the channel with the separable kernel.

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Constructor & Destructor Documentation

template<class T>

lti::ogd1Kernel< T >::ogd1Kernel

(

)

Default constructor.

Creates an empty kernel. To initialize use generate() or generateBasisKernel().

template<class T>

lti::ogd1Kernel< T >::ogd1Kernel	(	const int &	size,
		const double &	theVariance = 1.4426950409,
		const double &	theAngle = 0.0
	)

Constructor.

Parameters:

	size	is the dimension of the one dimensional part (i.e. the kernel has dimensions size x size !)
	theVariance	variance of the kernel
	theAngle	used angle (in radians)

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Member Function Documentation

template<class T>

void lti::ogd1Kernel< T >::generate	(	const int &	size,
		const double &	theVariance,
		const double &	theAngle
	)

Initialize this kernel with the specified values.

Parameters:

	size	is the dimension of the one dimensional part (i.e. the kernel has dimensions size x size !)
	theVariance	variance of the kernel
	theAngle	used angle (in radians)

template<class T>

void lti::ogd1Kernel< T >::generateBasisKernel	(	const int &	whichBasis,
		const int &	size,
		const double &	theVariance
	)

Initialize this kernel with the specified values.

Parameters:

	whichBasis	the steerable filter basis (for ogd1 must be 0 or 1)
	size	is the dimension of the one dimensional part (i.e. the kernel has dimensions size x size !)
	theVariance	variance of the kernel

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

• ltiOgdKernels.h