/usr/include/InsightToolkit/Common/itkGaussianKernelFunction.h is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | /*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGaussianKernelFunction.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkGaussianKernelFunction_h
#define __itkGaussianKernelFunction_h
#include "itkKernelFunction.h"
#include "vnl/vnl_math.h"
#include <math.h>
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 KernelFunction for more details.
*
* \sa KernelFunction
*
* \ingroup Functions
*/
class ITKCommon_EXPORT GaussianKernelFunction : public KernelFunction
{
public:
/** Standard class typedefs. */
typedef GaussianKernelFunction Self;
typedef KernelFunction Superclass;
typedef SmartPointer<Self> Pointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(GaussianKernelFunction, KernelFunction);
/** Evaluate the function. */
inline double Evaluate (const double& u) const
{ return ( vcl_exp(-0.5 * vnl_math_sqr( u ) ) * m_Factor ); }
protected:
GaussianKernelFunction();
~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
static const double m_Factor;
};
} // end namespace itk
#endif
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