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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 itkMinimumMaximumImageFilter_hxx
#define itkMinimumMaximumImageFilter_hxx
#include "itkImageScanlineIterator.h"
#include <mutex>
#include <vector>
namespace itk
{
template <typename TInputImage>
MinimumMaximumImageFilter<TInputImage>::MinimumMaximumImageFilter()
{
Self::SetMinimum(NumericTraits<PixelType>::max());
Self::SetMaximum(NumericTraits<PixelType>::NonpositiveMin());
}
template <typename TInputImage>
DataObject::Pointer
MinimumMaximumImageFilter<TInputImage>::MakeOutput(const DataObjectIdentifierType & name)
{
if (name == "Minimum" || name == "Maximum")
{
return PixelObjectType::New();
}
return Superclass::MakeOutput(name);
}
template <typename TInputImage>
void
MinimumMaximumImageFilter<TInputImage>::BeforeStreamedGenerateData()
{
Superclass::BeforeStreamedGenerateData();
m_ThreadMin = NumericTraits<PixelType>::max();
m_ThreadMax = NumericTraits<PixelType>::NonpositiveMin();
}
template <typename TInputImage>
void
MinimumMaximumImageFilter<TInputImage>::AfterStreamedGenerateData()
{
Superclass::AfterStreamedGenerateData();
this->SetMinimum(m_ThreadMin);
this->SetMaximum(m_ThreadMax);
}
template <typename TInputImage>
void
MinimumMaximumImageFilter<TInputImage>::ThreadedStreamedGenerateData(const RegionType & regionForThread)
{
if (regionForThread.GetNumberOfPixels() == 0)
{
return;
}
PixelType localMin = NumericTraits<PixelType>::max();
PixelType localMax = NumericTraits<PixelType>::NonpositiveMin();
ImageScanlineConstIterator it(this->GetInput(), regionForThread);
// do the work
while (!it.IsAtEnd())
{
// Handle the odd pixel separately
if (regionForThread.GetSize(0) % 2 == 1)
{
const PixelType value = it.Get();
localMin = std::min(value, localMin);
localMax = std::max(value, localMax);
++it;
}
while (!it.IsAtEndOfLine())
{
const PixelType value1 = it.Get();
++it;
const PixelType value2 = it.Get();
++it;
if (value1 > value2)
{
localMax = std::max(value1, localMax);
localMin = std::min(value2, localMin);
}
else
{
localMax = std::max(value2, localMax);
localMin = std::min(value1, localMin);
}
}
it.NextLine();
}
const std::lock_guard<std::mutex> lockGuard(m_Mutex);
m_ThreadMin = std::min(localMin, m_ThreadMin);
m_ThreadMax = std::max(localMax, m_ThreadMax);
}
template <typename TImage>
void
MinimumMaximumImageFilter<TImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Minimum: " << static_cast<typename NumericTraits<PixelType>::PrintType>(this->GetMinimum())
<< std::endl;
os << indent << "Maximum: " << static_cast<typename NumericTraits<PixelType>::PrintType>(this->GetMaximum())
<< std::endl;
}
} // end namespace itk
#endif
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