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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkGradientToMagnitudeImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:40 $
Version: $Revision: 1.21 $
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 __itkGradientToMagnitudeImageFilter_h
#define __itkGradientToMagnitudeImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
/** \class GradientToMagnitudeImageFilter
*
* \brief Take an image of vectors as input and produce an image with the
* magnitude of those vectors.
*
* The filter expects the input image pixel type to be a vector and
* the output image pixel type to be a scalar.
*
* This filter assumes that the PixelType of the input image is a VectorType
* that provides a GetNorm() method.
*
* \ingroup IntensityImageFilters Multithreaded
*/
namespace Functor {
template< class TInput, class TOutput>
class GradientMagnitude
{
public:
GradientMagnitude() {}
~GradientMagnitude() {}
bool operator!=( const GradientMagnitude & ) const
{
return false;
}
bool operator==( const GradientMagnitude & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput & A )
{
return static_cast<TOutput>( A.GetNorm() );
}
};
}
template <class TInputImage, class TOutputImage>
class ITK_EXPORT GradientToMagnitudeImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::GradientMagnitude< typename TInputImage::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef GradientToMagnitudeImageFilter Self;
typedef UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::GradientMagnitude< typename TInputImage::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(GradientToMagnitudeImageFilter,
UnaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<typename TInputImage::PixelType::ValueType>));
/** End concept checking */
#endif
protected:
GradientToMagnitudeImageFilter() {}
virtual ~GradientToMagnitudeImageFilter() {}
private:
GradientToMagnitudeImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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