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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 itkSquaredDifferenceImageFilter_h
#define itkSquaredDifferenceImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
namespace itk
{
/** \class SquaredDifferenceImageFilter
* \brief Implements pixel-wise the computation of squared difference.
*
* This filter 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 filter will walk over all the pixels in the two input images, and for
* each one of them it will do the following:
*
* - cast the input 1 pixel value to \c double
* - cast the input 2 pixel value to \c double
* - compute the difference of the two pixel values
* - compute the square of the difference
* - cast the \c double value resulting from \c sqr() to the pixel type of the output image
* - store the casted value into the output image.
*
* The filter expect all images to have the same dimension
* (e.g. all 2D, or all 3D, or all ND)
*
* \ingroup IntensityImageFilters MultiThreaded
* \ingroup ITKImageCompare
*
* \wiki
* \wikiexample{ImageProcessing/SquaredDifferenceImageFilter,Compute the squared difference of corresponding pixels in two images}
* \endwiki
*/
namespace Functor
{
template< typename TInput1, typename TInput2, typename TOutput >
class SquaredDifference2
{
public:
SquaredDifference2() {}
~SquaredDifference2() {}
bool operator!=(const SquaredDifference2 &) const
{
return false;
}
bool operator==(const SquaredDifference2 & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput1 & A,
const TInput2 & B) const
{
const double dA = static_cast< double >( A );
const double dB = static_cast< double >( B );
const double diff = dA - dB;
return static_cast< TOutput >( diff * diff );
}
};
}
template< typename TInputImage1, typename TInputImage2, typename TOutputImage >
class SquaredDifferenceImageFilter:
public
BinaryFunctorImageFilter< TInputImage1, TInputImage2, TOutputImage,
Functor::SquaredDifference2<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef SquaredDifferenceImageFilter Self;
typedef BinaryFunctorImageFilter<
TInputImage1, TInputImage2, TOutputImage,
Functor::SquaredDifference2<
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(SquaredDifferenceImageFilter,
BinaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( Input1ConvertibleToDoubleCheck,
( Concept::Convertible< typename TInputImage1::PixelType, double > ) );
itkConceptMacro( Input2ConvertibleToDoubleCheck,
( Concept::Convertible< typename TInputImage2::PixelType, double > ) );
itkConceptMacro( DoubleConvertibleToOutputCheck,
( Concept::Convertible< double, typename TOutputImage::PixelType > ) );
// End concept checking
#endif
protected:
SquaredDifferenceImageFilter() {}
virtual ~SquaredDifferenceImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(SquaredDifferenceImageFilter);
};
} // end namespace itk
#endif
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