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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 itkEdgePotentialImageFilter_h
#define itkEdgePotentialImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
/** \class EdgePotentialImageFilter
*
* \brief Computes the edge potential of an image from the image gradient.
*
* Input to this filter should be a CovariantVector image representing
* the image gradient.
*
* The filter expect both the input and output images to have the same
* number of dimensions, and the output to be of a scalar image type.
*
* \ingroup ITKImageIntensity
*/
namespace Functor
{
template< typename TInput, typename TOutput >
class EdgePotential
{
public:
EdgePotential() {}
~EdgePotential() {}
bool operator!=(const EdgePotential &) const
{
return false;
}
bool operator==(const EdgePotential & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput & A) const
{
return static_cast< TOutput >( std::exp( -1.0 * A.GetNorm() ) );
}
};
}
template< typename TInputImage, typename TOutputImage >
class EdgePotentialImageFilter:
public
UnaryFunctorImageFilter< TInputImage, TOutputImage,
Functor::EdgePotential<
typename TInputImage::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef EdgePotentialImageFilter Self;
typedef UnaryFunctorImageFilter< TInputImage, TOutputImage,
Functor::EdgePotential<
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(EdgePotentialImageFilter,
UnaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< typename TInputImage::PixelType::ValueType > ) );
// End concept checking
#endif
protected:
EdgePotentialImageFilter() {}
virtual ~EdgePotentialImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(EdgePotentialImageFilter);
};
} // end namespace itk
#endif
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