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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkNaryMaximumImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:41 $
Version: $Revision: 1.8 $
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 __itkNaryMaximumImageFilter_h
#define __itkNaryMaximumImageFilter_h
#include "itkNaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
/** \class NaryMaximumImageFilter
* \brief Implements an operator computing the pixel-wise maximum of several images.
*
* This class is parametrized over the types of the input images and the type
* of the output image. Numeric conversions (castings) are done by the C++
* defaults.
*
* The pixel type of the output images must have a valid defintion of the
* operator<. This condition is required because internally this filter will
* perform an operation similar to:
*
* const OutputPixelType query_value = static_cast<OutputPixelType>(pixel_from_input_n);
* if(current_maximum < query_value)
* {
* current_maximum = query_value;
* }
* (where current_maximum is also of type OutputPixelType)
*
* for each of the n input images.
*
* For example, this filter could be used directly to find a "maximum projection"
* of a series of images, often used in preliminary analysis of time-series data.
*
* \author Zachary Pincus
*
* This filter was contributed by Zachary Pincus from the Department of
* Biochemistry and Program in Biomedical Informatics at Stanford University
* School of Medicine
*
* \ingroup IntensityImageFilters Multithreaded
*/
namespace Functor {
template< class TInput, class TOutput >
class Maximum1
{
public:
typedef typename NumericTraits< TOutput >::ValueType OutputValueType;
// not sure if this typedef really makes things more clear... could just use TOutput?
Maximum1() {}
~Maximum1() {}
inline TOutput operator()( const std::vector< TInput > & B)
{
OutputValueType A = NumericTraits< TOutput >::NonpositiveMin();
for( unsigned int i=0; i< B.size(); i++ )
{
if( A < static_cast<OutputValueType>(B[i]) )
{
A = static_cast< OutputValueType > (B[i]);
}
}
return A;
}
bool operator== (const Maximum1&) const
{
return true;
}
bool operator!= (const Maximum1&) const
{
return false;
}
};
}
template <class TInputImage, class TOutputImage>
class ITK_EXPORT NaryMaximumImageFilter :
public
NaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::Maximum1< typename TInputImage::PixelType,
typename TInputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef NaryMaximumImageFilter Self;
typedef NaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::Maximum1< typename TInputImage::PixelType,
typename TInputImage::PixelType > > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(NaryMaximumImageFilter,
NaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputConvertibleToOutputCheck,
(Concept::Convertible<typename TInputImage::PixelType,
typename TOutputImage::PixelType>));
itkConceptMacro(InputLessThanComparableCheck,
(Concept::LessThanComparable<typename TInputImage::PixelType>));
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<typename TInputImage::PixelType>));
/** End concept checking */
#endif
protected:
NaryMaximumImageFilter() {}
virtual ~NaryMaximumImageFilter() {}
private:
NaryMaximumImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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