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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 itkSubtractImageFilter_h
#define itkSubtractImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
namespace itk
{
namespace Functor
{
/**
* \class Sub2
* \brief
* \ingroup ITKImageIntensity
*/
template< typename TInput1, typename TInput2 = TInput1, typename TOutput = TInput1 >
class Sub2
{
public:
Sub2() {}
~Sub2() {}
bool operator!=(const Sub2 &) const
{
return false;
}
bool operator==(const Sub2 & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput1 & A, const TInput2 & B) const
{ return static_cast<TOutput>( A - B ); }
};
}
/** \class SubtractImageFilter
* \brief Pixel-wise subtraction of two images.
*
* Subtract each pixel from image2 from its corresponding pixel in
* image1:
*
* \code
* Output = Input1 - Input2.
* \endcode
*
* This is done using
*
* \code
* SetInput1( image1 );
* SetInput2( image2 );
* \endcode
*
* 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.
*
* Additionally, a constant can be subtracted from every pixel in an image using:
*
* \code
* SetInput1( image1 );
* SetConstant2( constant );
* \endcode
*
* \note The result of AddImageFilter with a negative constant is not
* necessarily the same as SubtractImageFilter. This would be the case when
* the PixelType defines an operator-() that is not the inverse of operator+()
*
* \ingroup IntensityImageFilters MultiThreaded
* \ingroup ITKImageIntensity
*
* \wiki
* \wikiexample{ImageProcessing/SubtractImageFilter,Subtract two images}
* \wikiexample{ImageProcessing/SubtractConstantFromImageFilter,Subtract a constant from every pixel in an image}
* \endwiki
*/
template< typename TInputImage1, typename TInputImage2 = TInputImage1, typename TOutputImage = TInputImage1 >
class SubtractImageFilter:
public
BinaryFunctorImageFilter< TInputImage1, TInputImage2, TOutputImage,
Functor::Sub2<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef SubtractImageFilter Self;
typedef BinaryFunctorImageFilter<
TInputImage1, TInputImage2, TOutputImage,
Functor::Sub2< typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType > > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(SubtractImageFilter,
BinaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( Input1Input2OutputAdditiveOperatorsCheck,
( Concept::AdditiveOperators< typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType > ) );
// End concept checking
#endif
protected:
SubtractImageFilter() {}
virtual ~SubtractImageFilter() {}
private:
SubtractImageFilter(const Self &) ITK_DELETE_FUNCTION;
void operator=(const Self &) ITK_DELETE_FUNCTION;
};
} // end namespace itk
#endif
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