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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkAutoCropLabelMapFilter.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.
Portions of this code are covered under the VTK copyright.
See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 __itkAutoCropLabelMapFilter_txx
#define __itkAutoCropLabelMapFilter_txx
#include "itkAutoCropLabelMapFilter.h"
namespace itk
{
template <class TInputImage>
AutoCropLabelMapFilter<TInputImage>
::AutoCropLabelMapFilter()
{
m_CropBorder.Fill( 0 );
}
template <class TInputImage>
void
AutoCropLabelMapFilter<TInputImage>
::GenerateOutputInformation()
{
const InputImageType * input = this->GetInput();
//
// FIXME: This way of implementing a GenerateOutputInformation() method is suspicious.
// Needs to be revisited.
//
if( !(input->GetMTime() > m_CropTimeStamp) && !(this->GetMTime() > m_CropTimeStamp) )
{
// early exit, crop sizes already computed
return;
}
// update the input if needed
if( input->GetSource() )
{
ProcessObject * upstream = input->GetSource();
if (upstream)
{
upstream->Update();
}
}
this->FindBoundingBox();
this->SetAndPadCropRegion();
}
template <class TInputImage>
void
AutoCropLabelMapFilter<TInputImage>
::FindBoundingBox()
{
typedef typename InputImageType::IndexValueType IndexValueType;
// find the bounding box of the objects
this->m_MinIndex.Fill( NumericTraits< IndexValueType >::max() );
this->m_MaxIndex.Fill( NumericTraits< IndexValueType >::NonpositiveMin() );
const InputImageType * inputImage = this->GetInput();
// iterate over all the lines
typename InputImageType::LabelObjectContainerType container = inputImage->GetLabelObjectContainer();
typename InputImageType::LabelObjectContainerType::const_iterator loit = container.begin();
while( loit != container.end() )
{
const LabelObjectType * labelObject = loit->second;
typename LabelObjectType::LineContainerType::const_iterator lit;
const typename LabelObjectType::LineContainerType & lineContainer = labelObject->GetLineContainer();
lit = lineContainer.begin();
while( lit != lineContainer.end() )
{
const IndexType & idx = lit->GetIndex();
IndexValueType length = lit->GetLength();
// update the mins and maxs
for( int i=0; i<ImageDimension; i++)
{
if( idx[i] < this->m_MinIndex[i] )
{
this->m_MinIndex[i] = idx[i];
}
if( idx[i] > this->m_MaxIndex[i] )
{
this->m_MaxIndex[i] = idx[i];
}
}
// must fix the max for the axis 0
if( idx[0] + (IndexValueType)length > this->m_MaxIndex[0] )
{
this->m_MaxIndex[0] = idx[0] + length - 1;
}
lit++;
}
loit++;
}
}
template <class TInputImage>
void
AutoCropLabelMapFilter<TInputImage>
::SetAndPadCropRegion()
{
const InputImageType * input = this->GetInput();
// prefetch image region and size
InputImageRegionType cropRegion = input->GetLargestPossibleRegion();
// final computation
SizeType regionSize;
for( int i=0; i<ImageDimension; i++ )
{
regionSize[i] = this->m_MaxIndex[i] - this->m_MinIndex[i] + 1;
}
cropRegion.SetIndex( this->m_MinIndex );
cropRegion.SetSize( regionSize );
// pad the crop border while ensuring border is not larger than the largest
// possible region of the input image
cropRegion.PadByRadius( m_CropBorder );
cropRegion.Crop( input->GetLargestPossibleRegion() );
// finally set that region as the largest output region
this->SetRegion(cropRegion);
m_CropTimeStamp.Modified();
Superclass::GenerateOutputInformation();
}
template <class TImage>
void
AutoCropLabelMapFilter<TImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Crop Border: " << m_CropBorder << std::endl;
os << indent << "Crop Time Stamp: " << m_CropTimeStamp << std::endl;
os << indent << "Min Indexes : " << m_MinIndex << std::endl;
os << indent << "Max Indexes : " << m_MaxIndex << std::endl;
}
} // end namespace itk
#endif
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