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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 itkDivideImageFilter_h
#define itkDivideImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
#include "itkMath.h"
namespace itk
{
namespace Functor
{
/**
* \class Div
* \brief
* \ingroup ITKImageIntensity
*/
template< typename TInput1, typename TInput2, typename TOutput >
class Div
{
public:
Div() {}
~Div() {}
bool operator!=(const Div &) const
{
return false;
}
bool operator==(const Div & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput1 & A, const TInput2 & B) const
{
if ( itk::Math::NotAlmostEquals(B, NumericTraits<TInput2>::ZeroValue()) )
{
return (TOutput)( A / B );
}
else
{
return NumericTraits< TOutput >::max( static_cast<TOutput>(A) );
}
}
};
}
/** \class DivideImageFilter
* \brief Pixel-wise division of two images.
*
* This class is templated over the types of the two
* input images and the type of the output image. When the divisor is zero,
* the division result is set to the maximum number that can be
* represented by default to avoid exception. Numeric conversions
* (castings) are done by the C++ defaults.
*
* \ingroup IntensityImageFilters
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*
* \wiki
* \wikiexample{ImageProcessing/DivideImageFilter,Pixel-wise division of two images}
* \endwiki
*/
template< typename TInputImage1, typename TInputImage2, typename TOutputImage >
class DivideImageFilter:
public
BinaryFunctorImageFilter< TInputImage1, TInputImage2, TOutputImage,
Functor::Div<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType > >
{
public:
/**
* Standard "Self" typedef.
*/
typedef DivideImageFilter Self;
/**
* Standard "Superclass" typedef.
*/
typedef BinaryFunctorImageFilter< TInputImage1, TInputImage2, TOutputImage,
Functor::Div<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType >
> Superclass;
/**
* Smart pointer typedef support
*/
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/**
* Method for creation through the object factory.
*/
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(DivideImageFilter,
BinaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( IntConvertibleToInput2Check,
( Concept::Convertible< int, typename TInputImage2::PixelType > ) );
itkConceptMacro( Input1Input2OutputDivisionOperatorsCheck,
( Concept::DivisionOperators< typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType > ) );
// End concept checking
#endif
protected:
DivideImageFilter() {}
virtual ~DivideImageFilter() {}
void GenerateData() ITK_OVERRIDE
{
const typename Superclass::DecoratedInput2ImagePixelType *input
= dynamic_cast< const typename Superclass::DecoratedInput2ImagePixelType * >(
this->ProcessObject::GetInput(1) );
if( input != ITK_NULLPTR && itk::Math::AlmostEquals(input->Get(), itk::NumericTraits< typename TInputImage2::PixelType >::ZeroValue()) )
{
itkGenericExceptionMacro(<<"The constant value used as denominator should not be set to zero");
}
else
{
Superclass::GenerateData();
}
}
private:
DivideImageFilter(const Self &) ITK_DELETE_FUNCTION;
void operator=(const Self &) ITK_DELETE_FUNCTION;
};
} // end namespace itk
#endif
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