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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 __itkStandardDeviationProjectionImageFilter_h
#define __itkStandardDeviationProjectionImageFilter_h
#include "itkProjectionImageFilter.h"
#include "itkConceptChecking.h"
namespace itk
{
/** \class StandardDeviationProjectionImageFilter
* \brief Mean projection
*
* This class was contributed to the Insight Journal by Gaetan Lehmann.
* The original paper can be found at
* http://hdl.handle.net/1926/164
*
* \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction,
* INRA de Jouy-en-Josas, France.
*
* \sa ProjectionImageFilter
* \sa MedianProjectionImageFilter
* \sa MeanProjectionImageFilter
* \sa SumProjectionImageFilter
* \sa MeanProjectionImageFilter
* \sa MaximumProjectionImageFilter
* \sa MinimumProjectionImageFilter
* \sa BinaryProjectionImageFilter
* \ingroup ITKImageStatistics
*/
namespace Functor
{
template< typename TInputPixel, typename TAccumulate >
class StandardDeviationAccumulator
{
public:
typedef typename NumericTraits< TInputPixel >::RealType RealType;
StandardDeviationAccumulator( SizeValueType size )
{
m_Size = size;
m_Values.reserve(size);
}
~StandardDeviationAccumulator(){}
inline void Initialize()
{
m_Sum = NumericTraits< TAccumulate >::Zero;
m_Values.clear();
}
inline void operator()(const TInputPixel & input)
{
m_Sum = m_Sum + input;
m_Values.push_back(input);
}
inline RealType GetValue()
{
// to avoid division by zero
if ( m_Size <= 1 )
{
return NumericTraits< RealType >::Zero;
}
typename NumericTraits< TInputPixel >::RealType mean =
( (RealType)m_Sum ) / m_Size;
typename std::vector< TInputPixel >::iterator it;
RealType squaredSum = NumericTraits< RealType >::Zero;
for ( it = m_Values.begin(); it != m_Values.end(); it++ )
{
squaredSum += vnl_math_sqr(*it - mean);
}
return std::sqrt( squaredSum / ( m_Size - 1 ) );
}
TAccumulate m_Sum;
SizeValueType m_Size;
std::vector< TInputPixel > m_Values;
};
} // end namespace Function
template< typename TInputImage,
typename TOutputImage,
typename TAccumulate = typename
NumericTraits< typename TOutputImage::PixelType >
::AccumulateType >
class StandardDeviationProjectionImageFilter:
public
ProjectionImageFilter< TInputImage, TOutputImage,
Functor::StandardDeviationAccumulator< typename
TInputImage::PixelType, TAccumulate > >
{
public:
typedef StandardDeviationProjectionImageFilter Self;
typedef ProjectionImageFilter< TInputImage, TOutputImage,
Functor::StandardDeviationAccumulator< typename
TInputImage::PixelType,
TAccumulate > > Superclass;
typedef TInputImage InputImageType;
typedef typename InputImageType::PixelType InputPixelType;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Runtime information support. */
itkTypeMacro(StandardDeviationProjectionImageFilter, ProjectionImageFilter);
/** Method for creation through the object factory. */
itkNewMacro(Self);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputPixelToOutputPixelTypeGreaterAdditiveOperatorCheck,
( Concept::AdditiveOperators< TAccumulate,
InputPixelType,
TAccumulate > ) );
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< InputPixelType > ) );
itkConceptMacro( AccumulateHasNumericTraitsCheck,
( Concept::HasNumericTraits< TAccumulate > ) );
// End concept checking
#endif
protected:
StandardDeviationProjectionImageFilter() {}
virtual ~StandardDeviationProjectionImageFilter() {}
private:
//purposely not implemented
StandardDeviationProjectionImageFilter(const Self &);
void operator=(const Self &); //purposely not implemented
}; // end StandardDeviationProjectionImageFilter
} //end namespace itk
#endif
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