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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 itkSqrtImageFilter_h
#define itkSqrtImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "itkMath.h"
namespace itk
{
namespace Functor
{
/**
* \class Sqrt
* \brief
* \ingroup ITKImageIntensity
*/
template< typename TInput, typename TOutput >
class Sqrt
{
public:
Sqrt() {}
~Sqrt() {}
bool operator!=(const Sqrt &) const
{
return false;
}
bool operator==(const Sqrt & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput & A) const
{
return static_cast<TOutput>( std::sqrt( static_cast<double>(A) ) );
}
};
}
/** \class SqrtImageFilter
* \brief Computes the square root of each pixel.
*
* The computations are performed using std::sqrt(x).
*
* \ingroup IntensityImageFilters
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*/
template< typename TInputImage, typename TOutputImage >
class SqrtImageFilter:
public
UnaryFunctorImageFilter< TInputImage, TOutputImage,
Functor::Sqrt< typename TInputImage::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef SqrtImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage, TOutputImage,
Functor::Sqrt< 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(SqrtImageFilter,
UnaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputConvertibleToDoubleCheck,
( Concept::Convertible< typename TInputImage::PixelType, double > ) );
itkConceptMacro( DoubleConvertibleToOutputCheck,
( Concept::Convertible< double, typename TOutputImage::PixelType > ) );
// End concept checking
#endif
protected:
SqrtImageFilter() {}
virtual ~SqrtImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(SqrtImageFilter);
};
} // end namespace itk
#endif
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