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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkDerivativeImageFilter.txx,v $
Language: C++
Date: $Date: 2006-01-11 19:43:31 $
Version: $Revision: 1.25 $
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 _itkDerivativeImageFilter_txx
#define _itkDerivativeImageFilter_txx
#include "itkDerivativeImageFilter.h"
#include "itkNumericTraits.h"
#include "itkNeighborhoodOperatorImageFilter.h"
#include "itkDerivativeOperator.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
#include "itkProgressAccumulator.h"
namespace itk
{
template <class TInputImage, class TOutputImage>
void
DerivativeImageFilter<TInputImage,TOutputImage>
::GenerateInputRequestedRegion() throw (InvalidRequestedRegionError)
{
// call the superclass' implementation of this method. this should
// copy the output requested region to the input requested region
Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
typename Superclass::InputImagePointer inputPtr =
const_cast< InputImageType * >( this->GetInput() );
if ( !inputPtr )
{
return;
}
// Build an operator so that we can determine the kernel size
DerivativeOperator<OutputPixelType, ImageDimension> oper;
oper.SetDirection(m_Direction);
oper.SetOrder(m_Order);
oper.CreateDirectional();
// get a copy of the input requested region (should equal the output
// requested region)
typename TInputImage::RegionType inputRequestedRegion;
inputRequestedRegion = inputPtr->GetRequestedRegion();
// pad the input requested region by the operator radius
inputRequestedRegion.PadByRadius( oper.GetRadius() );
// crop the input requested region at the input's largest possible region
if ( inputRequestedRegion.Crop(inputPtr->GetLargestPossibleRegion()) )
{
inputPtr->SetRequestedRegion( inputRequestedRegion );
return;
}
else
{
// Couldn't crop the region (requested region is outside the largest
// possible region). Throw an exception.
// store what we tried to request (prior to trying to crop)
inputPtr->SetRequestedRegion( inputRequestedRegion );
// build an exception
InvalidRequestedRegionError e(__FILE__, __LINE__);
e.SetLocation(ITK_LOCATION);
e.SetDescription("Requested region is (at least partially) outside the largest possible region.");
e.SetDataObject(inputPtr);
throw e;
}
}
template< class TInputImage, class TOutputImage >
void
DerivativeImageFilter< TInputImage, TOutputImage >
::GenerateData()
{
ZeroFluxNeumannBoundaryCondition<TInputImage> nbc;
// Define the operator value type so that we can filter integral
// images and have the proper operator defined.
typedef typename NumericTraits<OutputPixelType>::RealType OperatorValueType;
// Filter
DerivativeOperator<OperatorValueType, ImageDimension> oper;
oper.SetDirection(m_Direction);
oper.SetOrder(m_Order);
oper.CreateDirectional();
oper.FlipAxes();
if (m_UseImageSpacing == true)
{
if ( this->GetInput()->GetSpacing()[m_Direction] == 0.0 )
{
itkExceptionMacro(<< "Image spacing cannot be zero.");
}
else
{
oper.ScaleCoefficients( 1.0 / this->GetInput()->GetSpacing()[m_Direction] );
}
}
typename NeighborhoodOperatorImageFilter<InputImageType, OutputImageType, OperatorValueType>
::Pointer filter =
NeighborhoodOperatorImageFilter<InputImageType, OutputImageType, OperatorValueType>
::New();
// Create a process accumulator for tracking the progress of this minipipeline
ProgressAccumulator::Pointer progress = ProgressAccumulator::New();
progress->SetMiniPipelineFilter(this);
// Register the filter with the with progress accumulator using
// equal weight proportion
progress->RegisterInternalFilter(filter,1.0f);
filter->OverrideBoundaryCondition(&nbc);
//
// Set up the mini-pipline
//
filter->SetOperator(oper);
filter->SetInput(this->GetInput());
// Graft this filter's output to the mini-pipeline. this sets up
// the mini-pipeline to write to this filter's output and copies
// region ivars and meta-data
filter->GraftOutput(this->GetOutput());
// Execute the mini-pipeline.
filter->Update();
// Graft the output of the mini-pipeline back onto the filter's output,
// this copies back the region ivars and meta-data.
this->GraftOutput(filter->GetOutput());
}
template< class TInputImage, class TOutputImage >
void
DerivativeImageFilter< TInputImage, TOutputImage >::
PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Order: " << m_Order << std::endl;
os << indent << "Direction: " << m_Direction << std::endl;
os << indent << "UseImageSpacing: " << m_UseImageSpacing << std::endl;
}
} // end namespace itk
#endif
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