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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkMovingHistogramImageFilterBase.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 __itkMovingHistogramImageFilterBase_txx
#define __itkMovingHistogramImageFilterBase_txx
#include "itkMovingHistogramImageFilterBase.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkOffset.h"
#include "itkProgressReporter.h"
#include "itkNumericTraits.h"
#ifndef zigzag
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkImageLinearConstIteratorWithIndex.h"
#endif
namespace itk {
template<class TInputImage, class TOutputImage, class TKernel>
MovingHistogramImageFilterBase<TInputImage, TOutputImage, TKernel>
::MovingHistogramImageFilterBase()
{
m_PixelsPerTranslation = 0;
// call again SetKernel in that class, to have the offsets computed for
// the default kernel. An AnalyzeKernel() method as in the binary
// morphology class may be a better way to go.
this->SetKernel( this->GetKernel() );
}
template<class TInputImage, class TOutputImage, class TKernel>
void
MovingHistogramImageFilterBase<TInputImage, TOutputImage, TKernel>
::SetKernel( const KernelType& kernel )
{
// first, build the list of offsets of added and removed pixels when the
// structuring element move of 1 pixel on 1 axis; do it for the 2 directions
// on each axes.
// transform the structuring element in an image for an easier
// access to the data
typedef Image< bool, TInputImage::ImageDimension > BoolImageType;
typename BoolImageType::Pointer tmpSEImage = BoolImageType::New();
tmpSEImage->SetRegions( kernel.GetSize() );
tmpSEImage->Allocate();
RegionType tmpSEImageRegion = tmpSEImage->GetRequestedRegion();
ImageRegionIteratorWithIndex<BoolImageType> kernelImageIt;
kernelImageIt = ImageRegionIteratorWithIndex<BoolImageType>(tmpSEImage, tmpSEImageRegion);
kernelImageIt.GoToBegin();
KernelIteratorType kernel_it = kernel.Begin();
OffsetListType kernelOffsets;
// create a center index to compute the offset
IndexType centerIndex;
for( unsigned axis=0; axis<ImageDimension; axis++)
{
centerIndex[axis] = kernel.GetSize()[axis] / 2;
}
unsigned long count = 0;
while( !kernelImageIt.IsAtEnd() )
{
// TODO: be sure that removing that comparison doesn't break backward compatibility
// only to fix msvc warning C4804: '>' : unsafe use of type 'bool' in operation
// kernelImageIt.Set( *kernel_it > 0 );
//
kernelImageIt.Set( *kernel_it );
// if( *kernel_it > 0 )
if( *kernel_it )
{
kernelImageIt.Set( true );
kernelOffsets.push_front( kernelImageIt.GetIndex() - centerIndex );
count++;
}
else
{
kernelImageIt.Set( false );
}
++kernelImageIt;
++kernel_it;
}
// verify that the kernel contain at least one point
if( count == 0 )
{
itkExceptionMacro( << "The kernel must contain at least one point." );
}
// no attribute should be modified before here to avoid setting the filter in a bad status
// store the kernel !!
Superclass::SetKernel( kernel );
// clear the already stored values
m_AddedOffsets.clear();
m_RemovedOffsets.clear();
//m_Axes
// store the kernel offset list
m_KernelOffsets = kernelOffsets;
FixedArray< unsigned long, ImageDimension > axisCount;
axisCount.Fill( 0 );
for( unsigned axis=0; axis<ImageDimension; axis++)
{
OffsetType refOffset;
refOffset.Fill( 0 );
for( int direction=-1; direction<=1; direction +=2)
{
refOffset[axis] = direction;
for( kernelImageIt.GoToBegin(); !kernelImageIt.IsAtEnd(); ++kernelImageIt)
{
IndexType idx = kernelImageIt.GetIndex();
if( kernelImageIt.Get() )
{
// search for added pixel during a translation
IndexType nextIdx = idx + refOffset;
if( tmpSEImageRegion.IsInside( nextIdx ) )
{
if( !tmpSEImage->GetPixel( nextIdx ) )
{
m_AddedOffsets[refOffset].push_front( nextIdx - centerIndex );
axisCount[axis]++;
}
}
else
{
m_AddedOffsets[refOffset].push_front( nextIdx - centerIndex );
axisCount[axis]++;
}
// search for removed pixel during a translation
IndexType prevIdx = idx - refOffset;
if( tmpSEImageRegion.IsInside( prevIdx ) )
{
if( !tmpSEImage->GetPixel( prevIdx ) )
{
m_RemovedOffsets[refOffset].push_front( idx - centerIndex );
axisCount[axis]++;
}
}
else
{
m_RemovedOffsets[refOffset].push_front( idx - centerIndex );
axisCount[axis]++;
}
}
}
}
}
// search for the best axis
typedef typename std::set<DirectionCost> MapCountType;
MapCountType invertedCount;
unsigned int i;
for( i=0; i<ImageDimension; i++ )
{
invertedCount.insert( DirectionCost( i, axisCount[i] ) );
}
i=0;
for( typename MapCountType::iterator it=invertedCount.begin(); it != invertedCount.end(); it++, i++)
{
m_Axes[i] = it->m_Dimension;
}
m_PixelsPerTranslation = axisCount[m_Axes[ImageDimension - 1]] / 2; // divided by 2 because there is 2 directions on the axis
}
template<class TInputImage, class TOutputImage, class TKernel>
void
MovingHistogramImageFilterBase<TInputImage, TOutputImage, TKernel>
::GetDirAndOffset(const IndexType LineStart,
const IndexType PrevLineStart,
OffsetType &LineOffset,
OffsetType &Changes,
int &LineDirection)
{
// when moving between lines in the same plane there should be only
// 1 non zero (positive) entry in LineOffset.
// When moving between planes there will be some negative ones too.
LineOffset = Changes = LineStart - PrevLineStart;
for (int y=0;y<ImageDimension;y++)
{
if (LineOffset[y] > 0)
{
LineOffset[y]=1; // should be 1 anyway
LineDirection=y;
}
else
{
LineOffset[y]=0;
}
}
}
template<class TInputImage, class TOutputImage, class TKernel>
void
MovingHistogramImageFilterBase<TInputImage, TOutputImage, TKernel>
::PrintSelf(std::ostream &os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "PixelsPerTranslation: " << m_PixelsPerTranslation << std::endl;
}
}// end namespace itk
#endif
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