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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 itkNaryAddImageFilter_h
#define itkNaryAddImageFilter_h
#include "itkNaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
namespace Functor
{
/**
* \class Add1
* \brief
* \ingroup ITKImageIntensity
*/
template< typename TInput, typename 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 >::ZeroValue();
for ( unsigned int i = 0; i < B.size(); i++ )
{
sum += static_cast< AccumulatorType >( B[i] );
}
return static_cast< TOutput >( sum );
}
bool operator==(const Add1 &) const
{
return true;
}
bool operator!=(const Add1 &) const
{
return false;
}
};
}
/** \class NaryAddImageFilter
* \brief Pixel-wise addition of N images.
*
* This class is templated over the types of the
* input images and the type of the output image.
* Numeric conversions (castings) are done by the C++ defaults.
*
* The pixel type of the input images must have a valid definition of
* the operator+ with each other. This condition is
* required because internally this filter will perform the operation
*
* \code
* pixel_from_image_N + pixel_from_image_(N+1)
* \endcode
*
* 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
*
* \code
* output_pixel = static_cast<OutputPixelType>( input_pixel_N + input_pixel_(N+1) )
* \endcode
*
* 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
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*/
template< typename TInputImage, typename TOutputImage >
class 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() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(NaryAddImageFilter);
};
} // end namespace itk
#endif
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