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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGridForwardWarpImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkGridForwardWarpImageFilter_txx
#define __itkGridForwardWarpImageFilter_txx
#include "itkGridForwardWarpImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkImageRegionConstIterator.h"
#include "itkNumericTraits.h"
#include "itkProgressReporter.h"
#include "itkLineIterator.h"
namespace itk
{
/**
* Default constructor.
*/
template <class TDeformationField,class TOutputImage>
GridForwardWarpImageFilter<TDeformationField,TOutputImage>
::GridForwardWarpImageFilter()
{
// Setup default values
m_BackgroundValue = NumericTraits<PixelType>::Zero;
m_ForegroundValue = NumericTraits<PixelType>::One;
m_GridPixSpacing = 5;
}
/**
* Standard PrintSelf method.
*/
template <class TDeformationField,class TOutputImage>
void
GridForwardWarpImageFilter<TDeformationField,TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "BackgroundValue: "
<< static_cast<typename NumericTraits<PixelType>::PrintType>(m_BackgroundValue)
<< std::endl;
os << indent << "ForegroundValue: "
<< static_cast<typename NumericTraits<PixelType>::PrintType>(m_ForegroundValue)
<< std::endl;
}
/**
* Compute the output for the region specified by outputRegionForThread.
*/
template <class TDeformationField,class TOutputImage>
void
GridForwardWarpImageFilter<TDeformationField,TOutputImage>
::GenerateData()
{
OutputImagePointer outputPtr = this->GetOutput();
DeformationFieldConstPointer fieldPtr = this->GetInput();
SpacingType spacing = fieldPtr->GetSpacing();
outputPtr->SetRegions( fieldPtr->GetRequestedRegion() );
outputPtr->SetOrigin( fieldPtr->GetOrigin() );
outputPtr->SetSpacing( spacing );
outputPtr->Allocate();
outputPtr->FillBuffer(m_BackgroundValue);
IndexType FirstIndex = fieldPtr->GetRequestedRegion().GetIndex();
IndexType LastIndex = fieldPtr->GetRequestedRegion().GetIndex() +
fieldPtr->GetRequestedRegion().GetSize();
// iterator for the output image
typedef ImageRegionIteratorWithIndex<OutputImageType> OutputImageIteratorWithIndex;
OutputImageIteratorWithIndex iter(outputPtr, outputPtr->GetRequestedRegion());
// iterator for the deformation field
typedef ImageRegionConstIterator<DeformationFieldType> DeformationFieldIterator;
DeformationFieldIterator fieldIt(fieldPtr, outputPtr->GetRequestedRegion());
// Bresenham line iterator
typedef LineIterator<OutputImageType> LineIteratorType;
typedef typename IndexType::IndexValueType IndexValueType;
IndexType index, refIndex, targetIndex;
ContinuousIndex<float, ImageDimension> contindex;
DisplacementType displacement;
bool inside, targetIn;
for (iter.GoToBegin(), fieldIt.GoToBegin(); !iter.IsAtEnd(); ++iter, ++fieldIt)
{
index = iter.GetIndex();
unsigned int numGridIntersect = 0;
for( unsigned int dim = 0; dim < ImageDimension; dim++ )
{
numGridIntersect += ( ( index[dim] % m_GridPixSpacing ) == 0 );
}
if (numGridIntersect == ImageDimension)
{
// we are on a grid point => transform it
// get the required displacement
displacement = fieldIt.Get();
// compute the mapped point
inside = true;
for(unsigned int j = 0; j < ImageDimension; j++ )
{
contindex[j] = index[j] + displacement[j]/spacing[j];
if (contindex[j]<FirstIndex[j] || contindex[j]>(LastIndex[j]-1))
{
inside = false;
break;
}
refIndex[j] = Math::Round<IndexValueType>(contindex[j]);
}
if( inside )
{
// We know the current grid point is inside
// we will check if the grid points that are above are also inside
// In such a case we draw a Bresenham line
for( unsigned int dim = 0; dim < ImageDimension; dim++ )
{
targetIndex = index;
targetIndex[dim] += m_GridPixSpacing;
if ( targetIndex[dim]<LastIndex[dim] )
{
// get the required displacement
displacement = fieldPtr->GetPixel( targetIndex );
// compute the mapped point
targetIn = true;
for( unsigned int j = 0; j < ImageDimension; j++ )
{
contindex[j] = targetIndex[j] + displacement[j]/spacing[j];
if( contindex[j]<FirstIndex[j] || contindex[j]>(LastIndex[j]-1) )
{
targetIn = false;
break;
}
targetIndex[j] = Math::Round<IndexValueType>(contindex[j]);
}
if( targetIn )
{
for ( LineIteratorType lineIter(outputPtr, refIndex, targetIndex);
!lineIter.IsAtEnd(); ++lineIter )
{
lineIter.Set(m_ForegroundValue);
}
}
}
}
}
}
}
//ProgressReporter progress(this, 0, numiter+1, numiter+1);
}
} // end namespace itk
#endif
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