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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkCentralDifferenceImageFunction.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:33 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef _itkCentralDifferenceImageFunction_txx |
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DEF |
#define _itkCentralDifferenceImageFunction_txx |
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#include "itkCentralDifferenceImageFunction.h" |
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namespace itk |
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{ |
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/** |
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* Constructor |
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*/ |
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template <class TInputImage, class TCoordRep> |
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CentralDifferenceImageFunction<TInputImage,TCoordRep> |
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::CentralDifferenceImageFunction() |
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{ |
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} |
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/** |
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* |
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*/ |
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template <class TInputImage, class TCoordRep> |
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void |
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CentralDifferenceImageFunction<TInputImage,TCoordRep> |
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::PrintSelf(std::ostream& os, Indent indent) const |
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{ |
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this->Superclass::PrintSelf(os,indent); |
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} |
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/** |
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* |
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*/ |
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template <class TInputImage, class TCoordRep> |
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typename CentralDifferenceImageFunction<TInputImage,TCoordRep>::OutputType |
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CentralDifferenceImageFunction<TInputImage,TCoordRep> |
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::EvaluateAtIndex( const IndexType& index ) const |
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{ |
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OutputType derivative; |
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derivative.Fill( 0.0 ); |
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IndexType neighIndex = index; |
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const typename InputImageType::SizeType& size = |
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****this->GetInputImage()->GetBufferedRegion().GetSize(); |
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const typename InputImageType::IndexType& start = |
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****this->GetInputImage()->GetBufferedRegion().GetIndex(); |
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for ( unsigned int dim = 0; dim < TInputImage::ImageDimension; dim++ ) |
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{ |
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// bounds checking |
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if( index[dim] < static_cast<long>(start[dim]) + 1 || |
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********index[dim] > (start[dim] + static_cast<long>(size[dim]) - 2 ) ) |
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{ |
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derivative[dim] = 0.0; |
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continue; |
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} |
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// compute derivative |
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neighIndex[dim] += 1; |
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derivative[dim] = this->GetInputImage()->GetPixel( neighIndex ); |
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neighIndex[dim] -= 2; |
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derivative[dim] -= this->GetInputImage()->GetPixel( neighIndex ); |
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derivative[dim] *= 0.5 / this->GetInputImage()->GetSpacing()[dim]; |
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neighIndex[dim] += 1; |
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**} |
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return ( derivative ); |
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} |
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} // namespace itk |
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#endif |
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