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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkWeightedAddImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:41 $
Version: $Revision: 1.4 $
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 __itkWeightedAddImageFilter_h
#define __itkWeightedAddImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
/** \class WeightedAddImageFilter
* \brief Implements an operator for computed a weighted sum of two images pixel-wise.
*
* 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 * alpha + pixel_from_image_2 * (1.0 - alpha)
*
* 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 * alpha + input2_pixel * (1-alpha) )
*
*
* \warning No numeric overflow checking is performed in this filter.
*
* \ingroup IntensityImageFilters Multithreaded
*/
namespace Functor {
template< class TInput1, class TInput2, class TOutput >
class WeightedAdd2
{
public:
typedef typename NumericTraits< TInput1 >::AccumulateType AccumulatorType;
typedef typename NumericTraits< TInput1 >::RealType RealType;
WeightedAdd2() {};
~WeightedAdd2() {};
bool operator!=( const WeightedAdd2 & other ) const
{
if( m_Alpha != other.m_Alpha)
{
return true;
}
return false;
}
bool operator==( const WeightedAdd2 & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput1 & A, const TInput2 & B)
{
const RealType sum1 = A * m_Alpha;
const RealType sum2 = B * m_Beta;
return static_cast<TOutput>( sum1 + sum2 );
}
void SetAlpha( RealType alpha ) {
m_Alpha = alpha;
m_Beta = NumericTraits< RealType >::One - m_Alpha;
}
RealType GetAlpha() const { return m_Alpha; }
private:
RealType m_Alpha;
RealType m_Beta; // auxiliary var to avoid a subtraction at every pixel
};
}
template <class TInputImage1, class TInputImage2, class TOutputImage>
class ITK_EXPORT WeightedAddImageFilter :
public
BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage,
Functor::WeightedAdd2<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef WeightedAddImageFilter Self;
typedef BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage,
Functor::WeightedAdd2<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType>
> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
typedef typename Superclass::FunctorType FunctorType;
typedef typename FunctorType::RealType RealType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(WeightedAddImageFilter,
BinaryFunctorImageFilter);
/** Set the weigth for the first operand of the weighted addition */
void SetAlpha( RealType alpha )
{
this->GetFunctor().SetAlpha( alpha );
this->Modified();
}
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(Input1HasNumericTraitsCheck,
(Concept::HasNumericTraits<typename TInputImage1::PixelType>));
itkConceptMacro(Input1RealTypeMultiplyCheck,
(Concept::MultiplyOperator<typename TInputImage1::PixelType,
RealType, RealType>));
itkConceptMacro(Input2RealTypeMultiplyCheck,
(Concept::MultiplyOperator<typename TInputImage2::PixelType,
RealType, RealType>));
/** End concept checking */
#endif
protected:
WeightedAddImageFilter() {}
virtual ~WeightedAddImageFilter() {}
private:
WeightedAddImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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