itkGradientImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGradientImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2002/09/30 15:24:40 $
  Version:   $Revision: 1.10 $

  Copyright (c) 2002 Insight 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 __itkGradientImageFilter_h
#define __itkGradientImageFilter_h

#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkCovariantVector.h"

namespace itk
{
template <class TInputImage, class TOperatorValueType=float, class TOutputValueType=float>
class ITK_EXPORT GradientImageFilter :
    public ImageToImageFilter< TInputImage,
                               Image<CovariantVector<TOutputValueType, ::itk::GetImageDimension<TInputImage>::ImageDimension>,  ::itk::GetImageDimension<TInputImage>::ImageDimension> >
{
public:
  itkStaticConstMacro(InputImageDimension, unsigned int,
                      TInputImage::ImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef GradientImageFilter Self;

  typedef TInputImage InputImageType;
  typedef typename InputImageType::Pointer InputImagePointer;
  typedef Image<CovariantVector<TOutputValueType, itkGetStaticConstMacro(OutputImageDimension)>,  itkGetStaticConstMacro(OutputImageDimension)> OutputImageType;
  typedef typename OutputImageType::Pointer OutputImagePointer;

  typedef ImageToImageFilter< InputImageType, OutputImageType> Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(GradientImageFilter, ImageToImageFilter);
  
  typedef typename InputImageType::PixelType InputPixelType;
  typedef TOperatorValueType OperatorValueType;
  typedef TOutputValueType OutputValueType;
  typedef CovariantVector<OutputValueType, itkGetStaticConstMacro(OutputImageDimension)> OutputPixelType;
  typedef typename OutputImageType::RegionType OutputImageRegionType;
  
  virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);

protected:
  GradientImageFilter() {}
  virtual ~GradientImageFilter() {}

  void ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
                            int threadId );

private:
  GradientImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};
  
} // end namespace itk

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

#endif

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