/usr/include/ITK-4.5/itkGaussianKernelFunction.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 __itkGaussianKernelFunction_h
#define __itkGaussianKernelFunction_h
#include "itkKernelFunctionBase.h"
#include "vnl/vnl_math.h"
#include <cmath>
namespace itk
{
/** \class GaussianKernelFunction
* \brief Gaussian kernel used for density estimation and nonparameteric
* regression.
*
* This class encapsulates a Gaussian smoothing kernel for
* density estimation or nonparameteric regression.
* See documentation for KernelFunctionBase for more details.
*
* \sa KernelFunctionBase
*
* \ingroup Functions
* \ingroup ITKCommon
*/
template< typename TRealValueType = double >
class GaussianKernelFunction:public KernelFunctionBase<TRealValueType>
{
public:
/** Standard class typedefs. */
typedef GaussianKernelFunction Self;
typedef KernelFunctionBase<TRealValueType> Superclass;
typedef SmartPointer< Self > Pointer;
typedef typename Superclass::RealType RealType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(GaussianKernelFunction, KernelFunctionBase);
/** Evaluate the function. */
inline TRealValueType Evaluate(const TRealValueType & u) const
{ return ( vcl_exp( static_cast< TRealValueType >(-0.5) * vnl_math_sqr(u) ) * m_Factor ); }
protected:
GaussianKernelFunction(): m_Factor( NumericTraits< TRealValueType >::One / vcl_sqrt(static_cast< TRealValueType >(2.0 * vnl_math::pi )) ) {};
virtual ~GaussianKernelFunction() {};
void PrintSelf(std::ostream & os, Indent indent) const
{ Superclass::PrintSelf(os, indent); }
private:
GaussianKernelFunction(const Self &); //purposely not implemented
void operator=(const Self &); //purposely not implemented
const TRealValueType m_Factor;
};
} // end namespace itk
#endif
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