itkGradientImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGradientImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2009-04-25 12:27:22 $
  Version:   $Revision: 1.20 $

  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 __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);

  void SetUseImageSpacingOn()
    { this->SetUseImageSpacing(true); }

  void SetUseImageSpacingOff()
    { this->SetUseImageSpacing(false); }

  itkSetMacro(UseImageSpacing, bool);
  itkGetConstMacro(UseImageSpacing, bool);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(InputConvertibleToOutputCheck,
    (Concept::Convertible<InputPixelType, OutputValueType>));
  itkConceptMacro(OutputHasNumericTraitsCheck,
    (Concept::HasNumericTraits<OutputValueType>));

#endif

  itkSetMacro( UseImageDirection, bool );
  itkGetConstMacro( UseImageDirection, bool );
  itkBooleanMacro( UseImageDirection );

protected:
  GradientImageFilter();
  virtual ~GradientImageFilter();
  void PrintSelf(std::ostream& os, Indent indent) const;

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

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

  bool m_UseImageSpacing;

  // flag to take or not the image direction into account
  // when computing the derivatives.
  bool m_UseImageDirection;

};
  
} // end namespace itk

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

#endif

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