/usr/include/ITK-4.5/itkGaborKernelFunction.h is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
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*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef __itkGaborKernelFunction_h
#define __itkGaborKernelFunction_h
#include "itkKernelFunctionBase.h"
#include <cmath>
namespace itk
{
/** \class GaborKernelFunction
* \brief Gabor kernel used for various computer vision tasks.
*
* This class encapsulates a complex Gabor kernel used for
* various computer vision tasks such as texture segmentation,
* motion analysis, and object recognition. It is essentially
* a complex sinusoid enveloped within a gaussian.
* See the discussion in
*
* Andreas Klein, Forester Lee, and Amir A. Amini, "Quantitative
* Coronary Angiography with Deformable Spline Models", IEEE-TMI
* 16(5):468-482, October 1997.
*
* for a basic discussion including additional references.
*
* This implementation was contributed as a paper to the Insight Journal
* http://hdl.handle.net/1926/500
*
* \sa KernelFunctionBase
*
* \ingroup Functions
* \ingroup ITKImageSources
*/
template< typename TRealValueType>
class GaborKernelFunction:public KernelFunctionBase<TRealValueType>
{
public:
/** Standard class typedefs. */
typedef GaborKernelFunction Self;
typedef KernelFunctionBase<TRealValueType> Superclass;
typedef SmartPointer< Self > Pointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(GaborKernelFunction, KernelFunctionBase);
/** Evaluate the function. */
inline TRealValueType Evaluate(const TRealValueType & u) const
{
TRealValueType parameter = vnl_math_sqr(u / this->m_Sigma);
TRealValueType envelope = vcl_exp(static_cast< TRealValueType >(-0.5) * parameter);
TRealValueType phase = static_cast< TRealValueType >(2.0 * vnl_math::pi) * this->m_Frequency * u
+ this->m_PhaseOffset;
if ( this->m_CalculateImaginaryPart )
{
return envelope * vcl_sin(phase);
}
else
{
return envelope * vcl_cos(phase);
}
}
itkSetMacro(Sigma, TRealValueType);
itkGetConstMacro(Sigma, TRealValueType);
itkSetMacro(Frequency, TRealValueType);
itkGetConstMacro(Frequency, TRealValueType);
itkSetMacro(PhaseOffset, TRealValueType);
itkGetConstMacro(PhaseOffset, TRealValueType);
itkSetMacro(CalculateImaginaryPart, bool);
itkGetConstMacro(CalculateImaginaryPart, bool);
itkBooleanMacro(CalculateImaginaryPart);
protected:
GaborKernelFunction()
{
this->m_CalculateImaginaryPart = false;
this->m_Sigma = NumericTraits< TRealValueType >::One;
this->m_Frequency = static_cast<TRealValueType>(0.4);
this->m_PhaseOffset = NumericTraits< TRealValueType >::Zero;
}
~GaborKernelFunction() {};
void PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Sigma: " << this->GetSigma() << std::endl;
os << indent << "Frequency: " << this->GetFrequency() << std::endl;
os << indent << "PhaseOffset: " << this->GetPhaseOffset() << std::endl;
os << indent << "CalculateImaginaryPart: " << this->GetCalculateImaginaryPart() << std::endl;
}
private:
GaborKernelFunction(const Self &); //purposely not implemented
void operator=(const Self &); //purposely not implemented
/** Standard deviation of the Gaussian envelope */
TRealValueType m_Sigma;
/** Modulation frequency of the sine or cosine component */
TRealValueType m_Frequency;
/** Phase offset of the sine or cosine component */
TRealValueType m_PhaseOffset;
/** Evaluate using the complex part */
bool m_CalculateImaginaryPart;
};
} // end namespace itk
#endif
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