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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkCheckerBoardImageFilter.txx,v $
Language: C++
Date: $Date: 2007-08-24 12:45:32 $
Version: $Revision: 1.3 $
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 _itkCheckerBoardImageFilter_txx
#define _itkCheckerBoardImageFilter_txx
#include "itkCheckerBoardImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkObjectFactory.h"
#include "itkProgressReporter.h"
namespace itk
{
/**
* Initialize new instance
*/
template <class TImage>
CheckerBoardImageFilter<TImage>
::CheckerBoardImageFilter()
{
m_CheckerPattern.Fill( 4 );
}
/**
* Print out a description of self
*
* \todo Add details about this class
*/
template <class TImage>
void
CheckerBoardImageFilter<TImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Checker pattern: " << m_CheckerPattern << std::endl;
}
/**
* Connect one of the operands for checkerboard operation
*/
template <class TImage >
void
CheckerBoardImageFilter<TImage>
::SetInput1( const InputImageType * image1 )
{
// Process object is not const-correct so the const casting is required.
this->SetNthInput(0, const_cast<InputImageType *>( image1 ));
}
/**
* Connect one of the operands for checkerboard operation
*/
template <class TImage >
void
CheckerBoardImageFilter<TImage>
::SetInput2( const InputImageType * image2 )
{
// Process object is not const-correct so the const casting is required.
this->SetNthInput(1, const_cast<InputImageType *>( image2 ));
}
/**
* ThreadedGenerateData
*/
template <class TImage>
void
CheckerBoardImageFilter<TImage>
::ThreadedGenerateData(
const ImageRegionType& outputRegionForThread, int threadId)
{
itkDebugMacro(<<"Actually executing");
// Get the output pointers
OutputImagePointer outputPtr = this->GetOutput();
InputImageConstPointer input1Ptr = this->GetInput(0);
InputImageConstPointer input2Ptr = this->GetInput(1);
// Create an iterator that will walk the output region for this thread.
typedef ImageRegionIteratorWithIndex< OutputImageType > OutputIterator;
typedef ImageRegionConstIteratorWithIndex< InputImageType > InputIterator;
OutputIterator outItr( outputPtr, outputRegionForThread );
InputIterator in1Itr( input1Ptr, outputRegionForThread );
InputIterator in2Itr( input2Ptr, outputRegionForThread );
outItr.GoToBegin();
in1Itr.GoToBegin();
in2Itr.GoToBegin();
// Support for progress methods/callbacks
ProgressReporter progress( this, threadId,
outputRegionForThread.GetNumberOfPixels());
typename InputImageType::SizeType size =
input2Ptr->GetLargestPossibleRegion().GetSize();
PatternArrayType factors;
for(unsigned int d=0; d<ImageDimension; d++)
{
factors[d] = size[d] / m_CheckerPattern[d];
}
typedef typename InputImageType::PixelType PixelType;
typedef typename InputImageType::IndexType IndexType;
PixelType pixval;
// Walk the output region
while ( !outItr.IsAtEnd() )
{
IndexType index = outItr.GetIndex();
unsigned int sum = 0;
for(unsigned int i=0; i<ImageDimension; i++)
{
sum += static_cast< unsigned int >( index[i] / factors[i] );
}
if( sum & 1 )
{
pixval = in2Itr.Get();
}
else
{
pixval = in1Itr.Get();
}
outItr.Set( pixval );
progress.CompletedPixel();
++outItr;
++in1Itr;
++in2Itr;
}
return;
}
} // end namespace itk
#endif
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