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itkRecursiveMultiResolutionPyramidImageFilter.txx
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itkRecursiveMultiResolutionPyramidImageFilter.txx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkRecursiveMultiResolutionPyramidImageFilter.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 _itkRecursiveMultiResolutionPyramidImageFilter_txx
#define _itkRecursiveMultiResolutionPyramidImageFilter_txx
#include "itkRecursiveMultiResolutionPyramidImageFilter.h"
#include "itkShrinkImageFilter.h"
#include "itkGaussianOperator.h"
#include "itkCastImageFilter.h"
#include "itkDiscreteGaussianImageFilter.h"
#include "itkExceptionObject.h"
#include "vnl/vnl_math.h"
namespace itk
{
/*
* Constructor
*/
template <class TInputImage, class TOutputImage>
RecursiveMultiResolutionPyramidImageFilter<TInputImage, TOutputImage>
::RecursiveMultiResolutionPyramidImageFilter()
{
}
/*
* GenerateData
*/
template <class TInputImage, class TOutputImage>
void
RecursiveMultiResolutionPyramidImageFilter<TInputImage, TOutputImage>
::GenerateData()
{
if( !this->IsScheduleDownwardDivisible( this->GetSchedule() ) )
{
// use the Superclass implemenation
this->Superclass::GenerateData();
return;
}
// Get the input and output pointers
InputImageConstPointer inputPtr = this->GetInput();
// Create caster, smoother and shrinker filters
typedef CastImageFilter<TInputImage, TOutputImage> CasterType;
typedef CastImageFilter<TOutputImage, TOutputImage> CopierType;
typedef DiscreteGaussianImageFilter<TOutputImage, TOutputImage> SmootherType;
typedef ShrinkImageFilter<TOutputImage,TOutputImage> ShrinkerType;
typename CasterType::Pointer caster = CasterType::New();
typename CopierType::Pointer copier = CopierType::New();
typename SmootherType::Pointer smoother = SmootherType::New();
typename ShrinkerType::Pointer shrinker = ShrinkerType::New();
int ilevel;
unsigned int idim;
unsigned int factors[ImageDimension];
double variance[ImageDimension];
bool allOnes;
OutputImagePointer outputPtr;
OutputImagePointer swapPtr;
typename TOutputImage::RegionType LPRegion;
smoother->SetUseImageSpacing( false );
smoother->SetMaximumError( this->GetMaximumError() );
shrinker->SetInput( smoother->GetOutput() );
// recursively compute outputs starting from the last one
for( ilevel = this->GetNumberOfLevels() - 1; ilevel > -1; ilevel--)
{
this->UpdateProgress( 1.0 - static_cast<float>( 1 + ilevel ) /
static_cast<float>( this->GetNumberOfLevels() ) );
// Allocate memory for each output
outputPtr = this->GetOutput( ilevel );
outputPtr->SetBufferedRegion( outputPtr->GetRequestedRegion() );
outputPtr->Allocate();
// cached a copy of the largest possible region
LPRegion = outputPtr->GetLargestPossibleRegion();
// Check shrink factors and compute variances
allOnes = true;
for( idim = 0; idim < ImageDimension; idim++ )
{
if( ilevel == static_cast<int>(this->GetNumberOfLevels()) - 1)
{
factors[idim] = this->GetSchedule()[ilevel][idim];
}
else
{
factors[idim] = this->GetSchedule()[ilevel][idim] /
this->GetSchedule()[ilevel+1][idim];
}
variance[idim] = vnl_math_sqr( 0.5 *
static_cast<float>( factors[idim] ) );
if( factors[idim] != 1 )
{
allOnes = false;
}
else
{
variance[idim] = 0.0;
}
}
if( allOnes && ilevel == static_cast<int>(this->GetNumberOfLevels()) - 1 )
{
// just copy the input over
caster->SetInput( inputPtr );
caster->GraftOutput( outputPtr );
// ensure only the requested region is updated
caster->UpdateOutputInformation();
caster->GetOutput()->SetRequestedRegion(outputPtr->GetRequestedRegion());
caster->GetOutput()->PropagateRequestedRegion();
caster->GetOutput()->UpdateOutputData();
swapPtr = caster->GetOutput();
}
else if( allOnes )
{
// just copy the data over
copier->SetInput( swapPtr );
copier->GraftOutput( outputPtr );
// ensure only the requested region is updated
copier->GetOutput()->UpdateOutputInformation();
copier->GetOutput()->SetRequestedRegion(outputPtr->GetRequestedRegion());
copier->GetOutput()->PropagateRequestedRegion();
copier->GetOutput()->UpdateOutputData();
swapPtr = copier->GetOutput();
}
else
{
if( ilevel == static_cast<int>(this->GetNumberOfLevels()) - 1 )
{
// use caster -> smoother -> shrinker piepline
caster->SetInput( inputPtr );
smoother->SetInput( caster->GetOutput() );
}
else
{
// use smoother -> shrinker pipeline
smoother->SetInput( swapPtr );
}
smoother->SetVariance( variance );
shrinker->SetShrinkFactors( factors );
shrinker->GraftOutput( outputPtr );
// ensure only the requested region is updated
shrinker->GetOutput()->UpdateOutputInformation();
shrinker->GetOutput()->SetRequestedRegion(outputPtr->GetRequestedRegion());
shrinker->GetOutput()->PropagateRequestedRegion();
shrinker->GetOutput()->UpdateOutputData();
swapPtr = shrinker->GetOutput();
}
// graft pipeline output back onto this filter's output
swapPtr->SetLargestPossibleRegion( LPRegion );
this->GraftNthOutput( ilevel, swapPtr );
// disconnect from pipeline to stop cycle
swapPtr->DisconnectPipeline();
}
}
/*
* PrintSelf method
*/
template <class TInputImage, class TOutputImage>
void
RecursiveMultiResolutionPyramidImageFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
}
/*
* GenerateOutputRequestedRegion
*/
template <class TInputImage, class TOutputImage>
void
RecursiveMultiResolutionPyramidImageFilter<TInputImage, TOutputImage>
::GenerateOutputRequestedRegion(DataObject * ptr )
{
// call the superclass's implementation of this method
Superclass::GenerateOutputRequestedRegion( ptr );
TOutputImage * refOutputPtr = static_cast<TOutputImage*>( ptr );
if( !refOutputPtr )
{
itkExceptionMacro( << "Could not cast ptr to TOutputImage*." );
}
// find the index for this output
unsigned int refLevel;
refLevel = refOutputPtr->GetSourceOutputIndex();
typedef typename TOutputImage::PixelType OutputPixelType;
typedef GaussianOperator<OutputPixelType,ImageDimension> OperatorType;
OperatorType * oper = new OperatorType;
oper->SetMaximumError( this->GetMaximumError() );
typedef typename OutputImageType::SizeType SizeType;
typedef typename SizeType::SizeValueType SizeValueType;
typedef typename OutputImageType::IndexType IndexType;
typedef typename IndexType::IndexValueType IndexValueType;
typedef typename OutputImageType::RegionType RegionType;
int ilevel, idim;
unsigned int factors[ImageDimension];
unsigned long radius[ImageDimension];
RegionType requestedRegion;
SizeType requestedSize;
IndexType requestedIndex;
// compute requested regions for lower levels
for( ilevel = refLevel + 1; ilevel < static_cast<int>(this->GetNumberOfLevels());
ilevel++ )
{
requestedRegion = this->GetOutput( ilevel - 1 )->GetRequestedRegion();
requestedSize = requestedRegion.GetSize();
requestedIndex = requestedRegion.GetIndex();
for( idim = 0; idim < static_cast<int>(ImageDimension); idim++ )
{
factors[idim] = this->GetSchedule()[ilevel-1][idim] / this->GetSchedule()[ilevel][idim];
// take into account shrink component
requestedSize[idim] *= static_cast<SizeValueType>(factors[idim]);
requestedIndex[idim] *= static_cast<IndexValueType>(factors[idim]);
// take into account smoothing component
if( factors[idim] > 1 )
{
oper->SetDirection( idim );
oper->SetVariance( vnl_math_sqr( 0.5 *
static_cast<float>( factors[idim] ) ) );
oper->CreateDirectional();
radius[idim] = oper->GetRadius()[idim];
}
else
{
radius[idim] = 0;
}
}
requestedRegion.SetSize( requestedSize );
requestedRegion.SetIndex( requestedIndex );
requestedRegion.PadByRadius( radius );
requestedRegion.Crop( this->GetOutput(ilevel)->
GetLargestPossibleRegion() );
this->GetOutput(ilevel)->SetRequestedRegion( requestedRegion );
}
// compute requested regions for higher levels
for( ilevel = refLevel - 1; ilevel > -1; ilevel-- )
{
requestedRegion = this->GetOutput( ilevel + 1 )->GetRequestedRegion();
requestedSize = requestedRegion.GetSize();
requestedIndex = requestedRegion.GetIndex();
for( idim = 0; idim < static_cast<int>(ImageDimension); idim++ )
{
factors[idim] = this->GetSchedule()[ilevel][idim] / this->GetSchedule()[ilevel+1][idim];
// take into account smoothing component
if( factors[idim] > 1 )
{
oper->SetDirection( idim );
oper->SetVariance( vnl_math_sqr( 0.5 *
static_cast<float>( factors[idim] ) ) );
oper->CreateDirectional();
radius[idim] = oper->GetRadius()[idim];
}
else
{
radius[idim] = 0;
}
requestedSize[idim] -= static_cast<SizeValueType>(
2 * radius[idim] );
requestedIndex[idim] += radius[idim];
// take into account shrink component
requestedSize[idim] = static_cast<SizeValueType>( vcl_floor(
static_cast<double>(requestedSize[idim]) /
static_cast<double>(factors[idim]) ) );
if( requestedSize[idim] < 1 )
{
requestedSize[idim] = 1;
}
requestedIndex[idim] = static_cast<IndexValueType>( vcl_ceil(
static_cast<double>(requestedIndex[idim]) /
static_cast<double>(factors[idim]) ) );
}
requestedRegion.SetSize( requestedSize );
requestedRegion.SetIndex( requestedIndex );
requestedRegion.Crop( this->GetOutput(ilevel)->
GetLargestPossibleRegion() );
this->GetOutput(ilevel)->SetRequestedRegion( requestedRegion );
}
// clean up
delete oper;
}
/*
* GenerateInputRequestedRegion
*/
template <class TInputImage, class TOutputImage>
void
RecursiveMultiResolutionPyramidImageFilter<TInputImage, TOutputImage>
::GenerateInputRequestedRegion()
{
// call the superclass' implementation of this method
Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
InputImagePointer inputPtr =
const_cast< InputImageType *>( this->GetInput() );
if ( !inputPtr )
{
itkExceptionMacro( << "Input has not been set." );
}
// compute baseIndex and baseSize
typedef typename OutputImageType::SizeType SizeType;
typedef typename SizeType::SizeValueType SizeValueType;
typedef typename OutputImageType::IndexType IndexType;
typedef typename IndexType::IndexValueType IndexValueType;
typedef typename OutputImageType::RegionType RegionType;
unsigned int refLevel = this->GetNumberOfLevels() - 1;
SizeType baseSize = this->GetOutput(refLevel)->GetRequestedRegion().GetSize();
IndexType baseIndex = this->GetOutput(refLevel)->GetRequestedRegion().GetIndex();
RegionType baseRegion;
unsigned int idim;
for( idim = 0; idim < ImageDimension; idim++ )
{
unsigned int factor = this->GetSchedule()[refLevel][idim];
baseIndex[idim] *= static_cast<IndexValueType>( factor );
baseSize[idim] *= static_cast<SizeValueType>( factor );
}
baseRegion.SetIndex( baseIndex );
baseRegion.SetSize( baseSize );
// compute requirements for the smoothing part
typedef typename TOutputImage::PixelType OutputPixelType;
typedef GaussianOperator<OutputPixelType,ImageDimension> OperatorType;
OperatorType *oper = new OperatorType;
unsigned long radius[ImageDimension];
RegionType inputRequestedRegion = baseRegion;
refLevel = 0;
for( idim = 0; idim < TInputImage::ImageDimension; idim++ )
{
oper->SetDirection(idim);
oper->SetVariance( vnl_math_sqr( 0.5 * static_cast<float>(
this->GetSchedule()[refLevel][idim] ) ) );
oper->SetMaximumError( this->GetMaximumError() );
oper->CreateDirectional();
radius[idim] = oper->GetRadius()[idim];
if( this->GetSchedule()[refLevel][idim] <= 1 )
{
radius[idim] = 0;
}
}
delete oper;
inputRequestedRegion.PadByRadius( radius );
// make sure the requested region is within the largest possible
inputRequestedRegion.Crop( inputPtr->GetLargestPossibleRegion() );
// set the input requested region
inputPtr->SetRequestedRegion( inputRequestedRegion );
}
} // namespace itk
#endif