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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkExtractOrthogonalSwath2DImageFilter.txx,v $
Language: C++
Date: $Date: 2005-07-26 15:06:24 $
Version: $Revision: 1.13 $
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 _itkExtractOrthogonalSwath2DImageFilter_txx
#define _itkExtractOrthogonalSwath2DImageFilter_txx
#include "itkExtractOrthogonalSwath2DImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkProgressReporter.h"
#include "itkNumericTraits.h"
namespace itk
{
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>
::SetSpacing(const double* spacing)
{
unsigned int i;
for (i=0; i<ImageDimension; i++)
{
if ( spacing[i] != m_Spacing[i] )
{
break;
}
}
if ( i < ImageDimension )
{
for (i=0; i<ImageDimension; i++)
{
m_Spacing[i] = spacing[i];
}
}
}
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>
::SetSpacing(const float* spacing)
{
unsigned int i;
for (i=0; i<ImageDimension; i++)
{
if ( (double)spacing[i] != m_Spacing[i] )
{
break;
}
}
if ( i < ImageDimension )
{
for (i=0; i<ImageDimension; i++)
{
m_Spacing[i] = spacing[i];
}
}
}
template <class TImage>
const double *
ExtractOrthogonalSwath2DImageFilter<TImage>
::GetSpacing() const
{
return m_Spacing;
}
//----------------------------------------------------------------------------
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>
::SetOrigin(const double* origin)
{
unsigned int i;
for (i=0; i<ImageDimension; i++)
{
if ( origin[i] != m_Origin[i] )
{
break;
}
}
if ( i < ImageDimension )
{
for (i=0; i<ImageDimension; i++)
{
m_Origin[i] = origin[i];
}
}
}
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>
::SetOrigin(const float* origin)
{
unsigned int i;
for (i=0; i<ImageDimension; i++)
{
if ( (double)origin[i] != m_Origin[i] )
{
break;
}
}
if ( i < ImageDimension )
{
for (i=0; i<ImageDimension; i++)
{
m_Origin[i] = origin[i];
}
}
}
template <class TImage>
const double *
ExtractOrthogonalSwath2DImageFilter<TImage>
::GetOrigin() const
{
return m_Origin;
}
//----------------------------------------------------------------------------
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>
::GenerateOutputInformation( void )
{
ImagePointer outputPtr = this->GetOutput(0);
ImageRegionType outputRegion;
ImageIndexType index;
index.Fill(0);
outputRegion.SetSize( this->m_Size );
outputRegion.SetIndex( index );
outputPtr->SetLargestPossibleRegion( outputRegion );
outputPtr->SetSpacing(this->m_Spacing);
outputPtr->SetOrigin(this->m_Origin);
}
/**
* GenerateData Performs the reflection
*/
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>
::GenerateData( void )
{
ImageConstPointer inputImagePtr = this->GetImageInput();
PathConstPointer inputPathPtr = this->GetPathInput();
ImagePointer outputPtr = this->GetOutput(0);
// Generate the output image
ImageRegionType outputRegion = outputPtr->GetRequestedRegion();
outputPtr->SetBufferedRegion( outputRegion );
outputPtr->Allocate();
// support progress methods/callbacks
ProgressReporter progress(this, 0, outputRegion.GetNumberOfPixels() );
typedef ImageRegionIteratorWithIndex<ImageType> OutputIterator;
typedef LinearInterpolateImageFunction<ImageType,double> InterpolatorType;
ImageIndexType index;
double orthogonalOffset;
PathInputType pathInput;
PathContinuousIndexType continousIndex;
PathVectorType pathDerivative;
typename InterpolatorType::Pointer interpolator = InterpolatorType::New();
interpolator->SetInputImage( inputImagePtr );
// Iterate through the output image
OutputIterator outputIt( outputPtr, outputPtr->GetRequestedRegion() );
for( outputIt.GoToBegin(); !outputIt.IsAtEnd(); ++outputIt )
{
index = outputIt.GetIndex();
// what position along the path coresponds to this column of the swath?
pathInput = inputPathPtr->StartOfInput()
+ double(inputPathPtr->EndOfInput()-inputPathPtr->StartOfInput())
* double(index[0]) / double(m_Size[0]);
// What is the orghogonal offset from the path in the input image for this
// particular index in the output swath image?
// Vertically centered swath pixels lie on the path in the input image.
orthogonalOffset = index[1] - int(m_Size[1]/2); // use signed arithmatic
// Make continousIndex point to the source pixel in the input image
continousIndex = inputPathPtr->Evaluate(pathInput);
pathDerivative = inputPathPtr->EvaluateDerivative(pathInput);
pathDerivative.Normalize();
continousIndex[0] -= orthogonalOffset * pathDerivative[1];
continousIndex[1] += orthogonalOffset * pathDerivative[0];
// set the swath pixel to the interpolated input pixel
if ( ! interpolator->IsInsideBuffer( continousIndex ) )
{
//itkExceptionMacro(<<"Requested input index ["<<continousIndex
// <<"] is not in the input image" );
outputIt.Set( m_DefaultPixelValue );
progress.CompletedPixel();
continue;
}
// prevent small interpolation error from rounding-down integer types
if( NumericTraits<ImagePixelType>::is_integer )
{
outputIt.Set( static_cast<ImagePixelType>( 0.5 +
interpolator->EvaluateAtContinuousIndex( continousIndex ) ) );
}
else
{
outputIt.Set( static_cast<ImagePixelType>(
interpolator->EvaluateAtContinuousIndex( continousIndex ) ) );
}
progress.CompletedPixel();
}
}
template <class TImage>
void
ExtractOrthogonalSwath2DImageFilter<TImage>::
PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Size: " << m_Size << std::endl;
os << indent << "DefaultPixelValue: "
<< static_cast<typename NumericTraits<ImagePixelType>::PrintType>(m_DefaultPixelValue)
<< std::endl;
}
} // end namespace itk
#endif
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