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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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"
#include <algorithm> // For max.
namespace itk
{
namespace Functor
{
/**
* \class Maximum1
* \brief
* \ingroup ITKImageIntensity
*/
template <typename TInput, typename TOutput>
class Maximum1
{
public:
using OutputValueType = typename NumericTraits<TOutput>::ValueType;
// not sure if this type alias really makes things more clear... could just use
// TOutput?
inline TOutput
operator()(const std::vector<TInput> & B) const
{
OutputValueType A = NumericTraits<TOutput>::NonpositiveMin();
for (unsigned int i = 0; i < B.size(); ++i)
{
A = std::max(A, static_cast<OutputValueType>(B[i]));
}
return A;
}
bool
operator==(const Maximum1 &) const
{
return true;
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(Maximum1);
};
} // namespace Functor
/** \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:
ITK_DISALLOW_COPY_AND_MOVE(NaryMaximumImageFilter);
/** Standard class type aliases. */
using Self = NaryMaximumImageFilter;
using Superclass =
NaryFunctorImageFilter<TInputImage,
TOutputImage,
Functor::Maximum1<typename TInputImage::PixelType, typename TInputImage::PixelType>>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(NaryMaximumImageFilter);
#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() = default;
~NaryMaximumImageFilter() override = default;
};
} // end namespace itk
#endif
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