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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.
*
*=========================================================================*/
/*=========================================================================
*
* Portions of this file are subject to the VTK Toolkit Version 3 copyright.
*
* Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
*
* For complete copyright, license and disclaimer of warranty information
* please refer to the NOTICE file at the top of the ITK source tree.
*
*=========================================================================*/
#ifndef itkThresholdImageFilter_hxx
#define itkThresholdImageFilter_hxx
#include "itkImageScanlineIterator.h"
#include "itkNumericTraits.h"
#include "itkObjectFactory.h"
#include "itkTotalProgressReporter.h"
#include "itkMacro.h"
#include "itkMath.h"
namespace itk
{
template <typename TImage>
ThresholdImageFilter<TImage>::ThresholdImageFilter()
: m_OutsideValue(PixelType{})
, m_Lower(NumericTraits<PixelType>::NonpositiveMin())
, m_Upper(NumericTraits<PixelType>::max())
{
this->InPlaceOff();
this->DynamicMultiThreadingOn();
this->ThreaderUpdateProgressOff();
}
template <typename TImage>
void
ThresholdImageFilter<TImage>::ThresholdAbove(const PixelType & threshold)
{
if (Math::NotExactlyEquals(m_Upper, threshold) || m_Lower > NumericTraits<PixelType>::NonpositiveMin())
{
m_Lower = NumericTraits<PixelType>::NonpositiveMin();
m_Upper = threshold;
this->Modified();
}
}
template <typename TImage>
void
ThresholdImageFilter<TImage>::ThresholdBelow(const PixelType & threshold)
{
if (Math::NotExactlyEquals(m_Lower, threshold) || m_Upper < NumericTraits<PixelType>::max())
{
m_Lower = threshold;
m_Upper = NumericTraits<PixelType>::max();
this->Modified();
}
}
template <typename TImage>
void
ThresholdImageFilter<TImage>::ThresholdOutside(const PixelType & lower, const PixelType & upper)
{
if (lower > upper)
{
itkExceptionMacro("Lower threshold cannot be greater than upper threshold.");
}
if (Math::NotExactlyEquals(m_Lower, lower) || Math::NotExactlyEquals(m_Upper, upper))
{
m_Lower = lower;
m_Upper = upper;
this->Modified();
}
}
template <typename TImage>
void
ThresholdImageFilter<TImage>::DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread)
{
// Get the input and output pointers
InputImagePointer inputPtr = this->GetInput();
OutputImagePointer outputPtr = this->GetOutput(0);
TotalProgressReporter progress(this, outputPtr->GetRequestedRegion().GetNumberOfPixels());
// Define/declare an iterator that will walk the output region for this
// thread.
ImageScanlineConstIterator inIt(inputPtr, outputRegionForThread);
ImageScanlineIterator outIt(outputPtr, outputRegionForThread);
// Walk the regions; threshold each pixel
while (!outIt.IsAtEnd())
{
while (!outIt.IsAtEndOfLine())
{
const PixelType value = inIt.Get();
if (m_Lower <= value && value <= m_Upper)
{
// Pixel passes to output unchanged and is replaced by m_OutsideValue in
// the inverse output image
outIt.Set(inIt.Get());
}
else
{
outIt.Set(m_OutsideValue);
}
++inIt;
++outIt;
}
inIt.NextLine();
outIt.NextLine();
progress.Completed(outputRegionForThread.GetSize()[0]);
}
}
template <typename TImage>
void
ThresholdImageFilter<TImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "OutsideValue: " << static_cast<typename NumericTraits<PixelType>::PrintType>(m_OutsideValue)
<< std::endl;
os << indent << "Lower: " << static_cast<typename NumericTraits<PixelType>::PrintType>(m_Lower) << std::endl;
os << indent << "Upper: " << static_cast<typename NumericTraits<PixelType>::PrintType>(m_Upper) << std::endl;
}
} // end namespace itk
#endif
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