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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 itkNaryMaximumImageFilter_h
#define itkNaryMaximumImageFilter_h
#include "itkNaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
namespace Functor
{
/**
* \class Maximum1
* \brief
* \ingroup ITKImageIntensity
*/
template< typename TInput, typename 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) const
{
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;
}
};
}
/** \class NaryMaximumImageFilter
* \brief Computes the pixel-wise maximum of several images.
*
* This class is templated 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 definition of the
* operator<. This condition is required because internally this filter will
* perform an operation similar to:
*
* \code
* const OutputPixelType query_value = static_cast<OutputPixelType>(pixel_from_input_n);
* if(current_maximum < query_value)
* {
* current_maximum = query_value;
* }
* \endcode
* (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
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*/
template< typename TInputImage, typename TOutputImage >
class 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() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(NaryMaximumImageFilter);
};
} // end namespace itk
#endif
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