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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 itkWeightedAddImageFilter_h
#define itkWeightedAddImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
#include "itkMath.h"
namespace itk
{
namespace Functor
{
/**
* \class WeightedAdd2
* \brief
* \ingroup ITKImageIntensity
*/
template< typename TInput1, typename TInput2, typename TOutput >
class WeightedAdd2
{
public:
typedef typename NumericTraits< TInput1 >::AccumulateType AccumulatorType;
typedef typename NumericTraits< TInput1 >::RealType RealType;
WeightedAdd2() : m_Alpha(0.0), m_Beta(0.0) {}
~WeightedAdd2() {}
bool operator!=(const WeightedAdd2 & other) const
{
if ( Math::NotExactlyEquals(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
{
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 >::OneValue() - m_Alpha;
}
RealType GetAlpha() const
{
return m_Alpha;
}
private:
RealType m_Alpha;
RealType m_Beta; // auxiliary var to avoid a subtraction at every pixel
};
}
/** \class WeightedAddImageFilter
* \brief Computes a weighted sum of two images pixel-wise.
*
* This class is templated 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 definition of
* the operator+ with a pixel type of the image 2. This condition is
* required because internally this filter will perform the operation
*
* \code
* pixel_from_image_1 * alpha + pixel_from_image_2 * (1.0 - alpha)
* \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>(
* input1_pixel * alpha + input2_pixel * (1-alpha) )
* \endcode
*
* The alpha parameter is set using SetAlpha.
*
* \warning No numeric overflow checking is performed in this filter.
*
* \ingroup IntensityImageFilters
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*/
template< typename TInputImage1, typename TInputImage2, typename TOutputImage >
class 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 weight for the first operand of the weighted addition */
void SetAlpha(RealType alpha)
{
this->GetFunctor().SetAlpha(alpha);
this->Modified();
}
/** Returns the current alpha value setting */
RealType GetAlpha() const
{
return this->GetFunctor().GetAlpha();
}
#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() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(WeightedAddImageFilter);
};
} // end namespace itk
#endif
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