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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 itkComputeImageExtremaFilter_hxx
#define itkComputeImageExtremaFilter_hxx
#include "itkComputeImageExtremaFilter.h"
#include <itkImageRegionConstIterator.h>
#include <itkImageScanlineIterator.h>
#include "elxMaskHasSameImageDomain.h"
namespace itk
{
template <typename TInputImage>
void
ComputeImageExtremaFilter<TInputImage>::BeforeStreamedGenerateData()
{
m_ThreadMin = NumericTraits<PixelType>::max();
m_ThreadMax = NumericTraits<PixelType>::NonpositiveMin();
m_SameGeometry =
(m_ImageSpatialMask != nullptr) && elastix::MaskHasSameImageDomain(*m_ImageSpatialMask, *(this->GetInput()));
}
template <typename TInputImage>
auto
ComputeImageExtremaFilter<TInputImage>::RetrieveMinMax(const TInputImage & inputImage,
const InputImageRegionType & regionForThread,
const ImageSpatialMaskType * const imageSpatialMask,
const bool sameGeometry) -> MinMaxResult
{
PixelType min = NumericTraits<PixelType>::max();
PixelType max = NumericTraits<PixelType>::NonpositiveMin();
if (imageSpatialMask)
{
if (sameGeometry)
{
const auto & maskImage = *(imageSpatialMask->GetImage());
for (ImageRegionConstIterator<TInputImage> it(&inputImage, regionForThread); !it.IsAtEnd(); ++it)
{
if (maskImage.GetPixel(it.GetIndex()) != PixelType{})
{
const PixelType value = it.Get();
min = std::min(min, value);
max = std::max(max, value);
}
}
}
else
{
for (ImageRegionConstIterator<TInputImage> it(&inputImage, regionForThread); !it.IsAtEnd(); ++it)
{
typename ImageSpatialMaskType::PointType point;
inputImage.TransformIndexToPhysicalPoint(it.GetIndex(), point);
if (imageSpatialMask->IsInsideInWorldSpace(point))
{
const PixelType value = it.Get();
min = std::min(min, value);
max = std::max(max, value);
}
}
}
}
else
{
for (ImageScanlineConstIterator<TInputImage> it(&inputImage, regionForThread); !it.IsAtEnd(); it.NextLine())
{
while (!it.IsAtEndOfLine())
{
const PixelType value = it.Get();
min = std::min(min, value);
max = std::max(max, value);
++it;
}
}
}
return { min, max };
}
template <typename TInputImage>
void
ComputeImageExtremaFilter<TInputImage>::ThreadedStreamedGenerateData(const InputImageRegionType & regionForThread)
{
if (regionForThread.GetSize(0) > 0)
{
const MinMaxResult minMaxResult =
RetrieveMinMax(*(this->GetInput()), regionForThread, m_ImageSpatialMask, m_SameGeometry);
// Lock after calling RetrieveMinMax.
const std::lock_guard<std::mutex> lockGuard(m_Mutex);
m_ThreadMin = std::min(minMaxResult.Min, m_ThreadMin);
m_ThreadMax = std::max(minMaxResult.Max, m_ThreadMax);
}
}
} // end namespace itk
#endif
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