itkBSplineResampleImageFilterBase.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkBSplineResampleImageFilterBase.h,v $
  Language:  C++
  Date:      $Date: 2002/09/11 19:39:01 $
  Version:   $Revision: 1.2 $

  Copyright (c) 2002 Insight 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 __itkBSplineResampleImageFilterBase_h
#define __itkBSplineResampleImageFilterBase_h

#include <vector>

#include "itkImageLinearIteratorWithIndex.h"
#include "itkImageLinearConstIteratorWithIndex.h"
#include "itkImageRegionIterator.h"   // Used for the output iterator needs to match filter program


#include "itkImageToImageFilter.h"

namespace itk
{
template <class TInputImage, class TOutputImage>
class ITK_EXPORT BSplineResampleImageFilterBase : 
  public ImageToImageFilter<TInputImage,TOutputImage>  
{

public:
  typedef BSplineResampleImageFilterBase       Self;
  typedef ImageToImageFilter<TInputImage,TOutputImage>  Superclass;
  typedef SmartPointer<Self>                    Pointer;
  typedef SmartPointer<const Self>              ConstPointer;

  itkTypeMacro(BSplineResampleImageFilterBase, ImageToImageFilter);

 
  //  Must be sustantiated through another class. itkNewMacro( Self );

  typedef typename Superclass::InputImageType InputImageType;

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef typename TInputImage::IndexType IndexType;

  typedef typename TInputImage::SizeType SizeType;

  typedef typename TInputImage::RegionType RegionType;

  typedef typename Superclass::OutputImagePixelType OutputImagePixelType;

  typedef itk::ImageLinearConstIteratorWithIndex<TInputImage> ConstInputImageIterator;

  typedef itk::ImageLinearConstIteratorWithIndex<TOutputImage> ConstOutputImageIterator;

  typedef itk::ImageLinearIteratorWithIndex<TOutputImage> OutputImageIterator;

  void SetSplineOrder(int SplineOrder);

  itkGetMacro(SplineOrder, int);


protected:
  void ReduceNDImage(OutputImageIterator &OutItr);

  void ExpandNDImage(OutputImageIterator &OutItr);

  virtual void InitializePyramidSplineFilter(int SplineOrder);

  virtual void Reduce1DImage( 
        const std::vector<double> & In, 
        OutputImageIterator & Iter, 
        unsigned int traverseSize
        );

  virtual void Expand1DImage( 
        const std::vector<double> & In, 
        OutputImageIterator & Iter, 
        unsigned int traverseSize
        );

  BSplineResampleImageFilterBase();
  virtual ~BSplineResampleImageFilterBase() {};
  void PrintSelf(std::ostream& os, Indent indent) const;

  int                       m_SplineOrder;// User specified spline order 
  int                       m_gSize;      // downsampling filter size
  int                       m_hSize;      // upsampling filter size
  std::vector<double>       m_g;          // downsampling filter coefficients
  std::vector<double>       m_h;          // upsampling filter coefficients

private:

  // Resizes m_Scratch Variable based on image sizes
  void InitializeScratch(SizeType DataLength);

  // Copies a line of data from the input to the m_Scratch for subsequent processing
  void CopyInputLineToScratch(ConstInputImageIterator & Iter);
  void CopyOutputLineToScratch(ConstOutputImageIterator & Iter);
  void CopyLineToScratch(ConstInputImageIterator & Iter);


  std::vector<double>       m_Scratch;        // temp storage for processing of Coefficients

  BSplineResampleImageFilterBase( const Self& ); //purposely not implemented
  void operator=( const Self& ); //purposely not implemented
  
};

} // namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBSplineResampleImageFilterBase.txx"
#endif

#endif

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