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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkUnaryFunctorImageFilter.txx,v $
Language: C++
Date: $Date: 2007-02-08 19:37:25 $
Version: $Revision: 1.31 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef _itkUnaryFunctorImageFilter_txx
#define _itkUnaryFunctorImageFilter_txx
#include "itkUnaryFunctorImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkProgressReporter.h"
namespace itk
{
/**
* Constructor
*/
template <class TInputImage, class TOutputImage, class TFunction >
UnaryFunctorImageFilter<TInputImage,TOutputImage,TFunction>
::UnaryFunctorImageFilter()
{
this->SetNumberOfRequiredInputs( 1 );
this->InPlaceOff();
}
/**
* UnaryFunctorImageFilter can produce an image which is a different resolution
* than its input image. As such, UnaryFunctorImageFilter needs to provide an
* implementation for GenerateOutputInformation() in order to inform
* the pipeline execution model. The original documentation of this
* method is below.
*
* \sa ProcessObject::GenerateOutputInformaton()
*/
template <class TInputImage, class TOutputImage, class TFunction>
void
UnaryFunctorImageFilter<TInputImage,TOutputImage,TFunction>
::GenerateOutputInformation()
{
// do not call the superclass' implementation of this method since
// this filter allows the input the output to be of different dimensions
// get pointers to the input and output
typename Superclass::OutputImagePointer outputPtr = this->GetOutput();
typename Superclass::InputImageConstPointer inputPtr = this->GetInput();
if ( !outputPtr || !inputPtr)
{
return;
}
// Set the output image largest possible region. Use a RegionCopier
// so that the input and output images can be different dimensions.
OutputImageRegionType outputLargestPossibleRegion;
this->CallCopyInputRegionToOutputRegion(outputLargestPossibleRegion,
inputPtr->GetLargestPossibleRegion());
outputPtr->SetLargestPossibleRegion( outputLargestPossibleRegion );
// Set the output spacing and origin
const ImageBase<Superclass::InputImageDimension> *phyData;
phyData
= dynamic_cast<const ImageBase<Superclass::InputImageDimension>*>(this->GetInput());
if (phyData)
{
// Copy what we can from the image from spacing and origin of the input
// This logic needs to be augmented with logic that select which
// dimensions to copy
unsigned int i, j;
const typename InputImageType::SpacingType&
inputSpacing = inputPtr->GetSpacing();
const typename InputImageType::PointType&
inputOrigin = inputPtr->GetOrigin();
const typename InputImageType::DirectionType&
inputDirection = inputPtr->GetDirection();
typename OutputImageType::SpacingType outputSpacing;
typename OutputImageType::PointType outputOrigin;
typename OutputImageType::DirectionType outputDirection;
// copy the input to the output and fill the rest of the
// output with zeros.
for (i=0; i < Superclass::InputImageDimension; ++i)
{
outputSpacing[i] = inputSpacing[i];
outputOrigin[i] = inputOrigin[i];
for (j=0; j < Superclass::OutputImageDimension; j++)
{
if (j < Superclass::InputImageDimension)
{
outputDirection[j][i] = inputDirection[j][i];
}
else
{
outputDirection[j][i] = 0.0;
}
}
}
for (; i < Superclass::OutputImageDimension; ++i)
{
outputSpacing[i] = 1.0;
outputOrigin[i] = 0.0;
for (j=0; j < Superclass::OutputImageDimension; j++)
{
if (j == i)
{
outputDirection[j][i] = 1.0;
}
else
{
outputDirection[j][i] = 0.0;
}
}
}
// set the spacing and origin
outputPtr->SetSpacing( outputSpacing );
outputPtr->SetOrigin( outputOrigin );
outputPtr->SetDirection( outputDirection );
outputPtr->SetNumberOfComponentsPerPixel( // propagate vector length info
inputPtr->GetNumberOfComponentsPerPixel());
}
else
{
// pointer could not be cast back down
itkExceptionMacro(<< "itk::UnaryFunctorImageFilter::GenerateOutputInformation "
<< "cannot cast input to "
<< typeid(ImageBase<Superclass::InputImageDimension>*).name() );
}
}
/**
* ThreadedGenerateData Performs the pixel-wise addition
*/
template <class TInputImage, class TOutputImage, class TFunction >
void
UnaryFunctorImageFilter<TInputImage,TOutputImage,TFunction>
::ThreadedGenerateData( const OutputImageRegionType &outputRegionForThread,
int threadId)
{
InputImagePointer inputPtr = this->GetInput();
OutputImagePointer outputPtr = this->GetOutput(0);
// Define the portion of the input to walk for this thread, using
// the CallCopyOutputRegionToInputRegion method allows for the input
// and output images to be different dimensions
InputImageRegionType inputRegionForThread;
this->CallCopyOutputRegionToInputRegion(inputRegionForThread, outputRegionForThread);
// Define the iterators
ImageRegionConstIterator<TInputImage> inputIt(inputPtr, inputRegionForThread);
ImageRegionIterator<TOutputImage> outputIt(outputPtr, outputRegionForThread);
ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());
inputIt.GoToBegin();
outputIt.GoToBegin();
while( !inputIt.IsAtEnd() )
{
outputIt.Set( m_Functor( inputIt.Get() ) );
++inputIt;
++outputIt;
progress.CompletedPixel(); // potential exception thrown here
}
}
} // end namespace itk
#endif
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