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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 itkShiftScaleImageFilter_hxx
#define itkShiftScaleImageFilter_hxx
#include "itkShiftScaleImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkNumericTraits.h"
#include "itkProgressReporter.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
ShiftScaleImageFilter< TInputImage, TOutputImage >
::ShiftScaleImageFilter()
{
m_Shift = NumericTraits< RealType >::ZeroValue();
m_Scale = NumericTraits< RealType >::OneValue();
m_UnderflowCount = 0;
m_OverflowCount = 0;
m_ThreadUnderflow.SetSize(1);
m_ThreadOverflow.SetSize(1);
m_InputImage = ITK_NULLPTR;
m_OutputImage = ITK_NULLPTR;
}
template< typename TInputImage, typename TOutputImage >
ShiftScaleImageFilter< TInputImage, TOutputImage >
::~ShiftScaleImageFilter()
{}
template< typename TInputImage, typename TOutputImage >
void
ShiftScaleImageFilter< TInputImage, TOutputImage >
::BeforeThreadedGenerateData()
{
ThreadIdType numberOfThreads = this->GetNumberOfThreads();
// Allocate and initialize the thread temporaries
m_ThreadUnderflow.SetSize(numberOfThreads);
m_ThreadUnderflow.Fill(0);
m_ThreadOverflow.SetSize(numberOfThreads);
m_ThreadOverflow.Fill(0);
m_InputImage = this->GetInput();
m_OutputImage = this->GetOutput();
}
template< typename TInputImage, typename TOutputImage >
void
ShiftScaleImageFilter< TInputImage, TOutputImage >
::AfterThreadedGenerateData()
{
ThreadIdType numberOfThreads = this->GetNumberOfThreads();
m_UnderflowCount = 0;
m_OverflowCount = 0;
// Accumulate counts for each thread
for ( ThreadIdType i = 0; i < numberOfThreads; i++ )
{
m_UnderflowCount += m_ThreadUnderflow[i];
m_OverflowCount += m_ThreadOverflow[i];
}
}
template< typename TInputImage, typename TOutputImage >
void
ShiftScaleImageFilter< TInputImage, TOutputImage >
::ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
ThreadIdType threadId)
{
RealType value;
ImageRegionConstIterator< TInputImage > it (this->m_InputImage, outputRegionForThread);
ImageRegionIterator< TOutputImage > ot (this->m_OutputImage, outputRegionForThread);
// support progress methods/callbacks
ProgressReporter progress( this, threadId, outputRegionForThread.GetNumberOfPixels() );
// shift and scale the input pixels
while ( !it.IsAtEnd() )
{
value = ( static_cast< RealType >( it.Get() ) + m_Shift ) * m_Scale;
if ( value < NumericTraits< OutputImagePixelType >::NonpositiveMin() )
{
ot.Set ( NumericTraits< OutputImagePixelType >::NonpositiveMin() );
m_ThreadUnderflow[threadId]++;
}
else if ( value > NumericTraits< OutputImagePixelType >::max() )
{
ot.Set ( NumericTraits< OutputImagePixelType >::max() );
m_ThreadOverflow[threadId]++;
}
else
{
ot.Set( static_cast< OutputImagePixelType >( value ) );
}
++it;
++ot;
progress.CompletedPixel();
}
}
template< typename TInputImage, typename TOutputImage >
void
ShiftScaleImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Shift: " << m_Shift << std::endl;
os << indent << "Scale: " << m_Scale << std::endl;
os << indent << "Computed values follow:" << std::endl;
os << indent << "UnderflowCount: " << m_UnderflowCount << std::endl;
os << indent << "OverflowCount: " << m_OverflowCount << std::endl;
}
} // end namespace itk
#endif
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