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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkNaryAddImageFilter.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 __itkNaryAddImageFilter_h
#define __itkNaryAddImageFilter_h
#include "itkNaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
/** \class NaryAddImageFilter
* \brief Implements an operator for pixel-wise addition of two images.
*
* This class is parametrized over the types of the two
* input images and the type of the output image.
* Numeric conversions (castings) are done by the C++ defaults.
*
* The pixel type of the input 1 image must have a valid defintion of
* the operator+ with a pixel type of the image 2. This condition is
* required because internally this filter will perform the operation
*
* pixel_from_image_1 + pixel_from_image_2
*
* Additionally the type resulting from the sum, will be cast to
* the pixel type of the output image.
*
* The total operation over one pixel will be
*
* output_pixel = static_cast<OutputPixelType>( input1_pixel + input2_pixel )
*
* For example, this filter could be used directly for adding images whose
* pixels are vectors of the same dimension, and to store the resulting vector
* in an output image of vector pixels.
*
* \warning No numeric overflow checking is performed in this filter.
*
* \ingroup IntensityImageFilters Multithreaded
*/
namespace Functor {
template< class TInput, class TOutput >
class Add1
{
public:
typedef typename NumericTraits< TInput >::AccumulateType AccumulatorType;
Add1() {}
~Add1() {}
inline TOutput operator()( const std::vector< TInput > & B) const
{
AccumulatorType sum = NumericTraits< TOutput >::Zero;
for( unsigned int i=0; i< B.size(); i++ )
{
sum += static_cast< TOutput >(B[i]);
}
return static_cast<TOutput>( sum );
}
bool operator== (const Add1&) const
{
return true;
}
bool operator!= (const Add1&) const
{
return false;
}
};
}
template <class TInputImage, class TOutputImage>
class ITK_EXPORT NaryAddImageFilter :
public
NaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::Add1<typename TInputImage::PixelType, typename TInputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef NaryAddImageFilter Self;
typedef NaryFunctorImageFilter<
TInputImage,TOutputImage,
Functor::Add1<typename TInputImage::PixelType,
typename TInputImage::PixelType> >
Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(NaryAddImageFilter,
NaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputConvertibleToOutputCheck,
(Concept::Convertible<typename TInputImage::PixelType,
typename TOutputImage::PixelType>));
itkConceptMacro(InputHasZeroCheck,
(Concept::HasZero<typename TInputImage::PixelType>));
/** End concept checking */
#endif
protected:
NaryAddImageFilter() {}
virtual ~NaryAddImageFilter() {}
private:
NaryAddImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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