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include
itkGaussianKernelFunction.h
Go to the documentation of this file.
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/*=========================================================================
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*
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* Copyright Insight Software Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0.txt
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*=========================================================================*/
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#ifndef __itkGaussianKernelFunction_h
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#define __itkGaussianKernelFunction_h
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#include "
itkKernelFunctionBase.h
"
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#include "vnl/vnl_math.h"
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#include <cmath>
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namespace
itk
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{
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template
<
typename
TRealValueType =
double
>
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class
ITK_EXPORT
GaussianKernelFunction
:
public
KernelFunctionBase
<TRealValueType>
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{
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public
:
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typedef
GaussianKernelFunction
Self
;
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typedef
KernelFunctionBase<TRealValueType>
Superclass
;
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typedef
SmartPointer< Self >
Pointer
;
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typedef
typename
Superclass::RealType
RealType
;
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itkNewMacro(
Self
);
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itkTypeMacro(
GaussianKernelFunction
,
KernelFunctionBase
);
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inline
TRealValueType Evaluate(
const
TRealValueType & u)
const
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{
return
( vcl_exp( static_cast< TRealValueType >(-0.5) * vnl_math_sqr(u) ) * m_Factor ); }
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protected
:
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GaussianKernelFunction
(): m_Factor(
NumericTraits
< TRealValueType >::One / vcl_sqrt(static_cast< TRealValueType >(2.0 * vnl_math::
pi
)) ) {};
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virtual
~GaussianKernelFunction
() {};
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void
PrintSelf(std::ostream & os,
Indent
indent)
const
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{ Superclass::PrintSelf(os, indent); }
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private
:
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GaussianKernelFunction
(
const
Self &);
//purposely not implemented
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void
operator=(
const
Self &);
//purposely not implemented
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const
TRealValueType
m_Factor
;
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};
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}
// end namespace itk
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#endif
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