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#ifndef THREADEDHISTOGRAMIMAGEFILTER_HXX
#define THREADEDHISTOGRAMIMAGEFILTER_HXX
#include "ThreadedHistogramImageFilter.h"
#include <itkProgressReporter.h>
#include <itkImageRegionConstIterator.h>
template <class TInputImage>
ThreadedHistogramImageFilter<TInputImage>
::ThreadedHistogramImageFilter()
{
this->SetNumberOfRequiredInputs(3);
this->SetNumberOfRequiredOutputs(2);
// Allocate the output histogram
m_OutputHistogram = ScalarImageHistogram::New();
this->SetNthOutput(1, m_OutputHistogram);
m_Bins = 0;
m_TransformScale = 1.0;
m_TransformShift = 0.0;
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::SetRangeInputs(PixelObjectType *inMin, PixelObjectType *inMax)
{
m_InputMin = inMin;
m_InputMax = inMax;
this->SetNthInput(1, inMin);
this->SetNthInput(2, inMax);
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::SetNumberOfBins(int nBins)
{
if(m_Bins != nBins)
{
m_Bins = nBins;
this->Modified();
}
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::SetIntensityTransform(double scale, double shift)
{
if(m_TransformScale != scale || m_TransformShift != shift)
{
m_TransformScale = scale;
m_TransformShift = shift;
this->Modified();
}
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::GenerateInputRequestedRegion()
{
Superclass::GenerateInputRequestedRegion();
if ( this->GetInput() )
{
InputImagePointer image =
const_cast< typename Superclass::InputImageType * >( this->GetInput() );
image->SetRequestedRegionToLargestPossibleRegion();
}
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::EnlargeOutputRequestedRegion(itk::DataObject *data)
{
Superclass::EnlargeOutputRequestedRegion(data);
data->SetRequestedRegionToLargestPossibleRegion();
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::AllocateOutputs()
{
// Pass the input through as the output
InputImagePointer image =
const_cast< TInputImage * >( this->GetInput() );
this->GraftOutput(image);
// Nothing to be done for the histogram output
}
template <class TInputImage>
void
ThreadedHistogramImageFilter<TInputImage>
::BeforeThreadedGenerateData()
{
itk::ThreadIdType numberOfThreads = this->GetNumberOfThreads();
// Get the range of the histogram
PixelType pxmin = m_InputMin->Get();
PixelType pxmax = m_InputMax->Get();
// Initialize the per-thread histograms
m_ThreadHistogram.resize(numberOfThreads);
for(unsigned int i = 0; i < numberOfThreads; i++)
{
m_ThreadHistogram[i] = HistogramType::New();
m_ThreadHistogram[i]->Initialize(pxmin, pxmax, m_Bins);
}
// Initialize the output
m_OutputHistogram->Initialize(pxmin, pxmax, m_Bins);
}
template< class TInputImage >
void
ThreadedHistogramImageFilter<TInputImage>
::ThreadedGenerateData(const RegionType &outputRegionForThread,
itk::ThreadIdType threadId)
{
if ( outputRegionForThread.GetNumberOfPixels() == 0 )
return;
// Get the histogram for this thread
HistogramType *hist = m_ThreadHistogram[threadId];
itk::ImageRegionConstIterator< TInputImage > it(this->GetInput(), outputRegionForThread);
while(!it.IsAtEnd())
{
hist->AddSample(it.Get());
++it;
}
}
template< class TInputImage >
void
ThreadedHistogramImageFilter<TInputImage>
::AfterThreadedGenerateData()
{
// Add up the partial histograms
for(unsigned int i = 0; i < m_ThreadHistogram.size(); i++)
{
m_OutputHistogram->AddCompatibleHistogram(*m_ThreadHistogram[i]);
}
// Apply the transform to the histogram
m_OutputHistogram->ApplyIntensityTransform(m_TransformScale, m_TransformShift);
}
template< class TInputImage >
void
ThreadedHistogramImageFilter<TInputImage>
::PrintSelf(std::ostream &os, itk::Indent indent) const
{
Superclass::PrintSelf(os, indent);
}
#endif // THREADEDHISTOGRAMIMAGEFILTER_HXX
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