itkDiscreteGaussianImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkDiscreteGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-14 19:20:33 $
  Version:   $Revision: 1.40 $

  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 __itkDiscreteGaussianImageFilter_h
#define __itkDiscreteGaussianImageFilter_h

#include "itkImageToImageFilter.h"
#include "itkFixedArray.h"
#include "itkImage.h"

namespace itk
{
template <class TInputImage, class TOutputImage >
class ITK_EXPORT DiscreteGaussianImageFilter :
    public ImageToImageFilter< TInputImage, TOutputImage > 
{
public:
  typedef DiscreteGaussianImageFilter                     Self;
  typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer<Self>                              Pointer;
  typedef SmartPointer<const Self>                        ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(DiscreteGaussianImageFilter, ImageToImageFilter);

  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;

  typedef typename TOutputImage::PixelType         OutputPixelType;
  typedef typename TOutputImage::InternalPixelType OutputInternalPixelType;
  typedef typename TInputImage::PixelType          InputPixelType;
  typedef typename TInputImage::InternalPixelType  InputInternalPixelType;

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

  typedef FixedArray<double, itkGetStaticConstMacro(ImageDimension)> ArrayType;

  itkSetMacro(Variance, ArrayType);
  itkGetMacro(Variance, const ArrayType);

  itkSetMacro(MaximumError, ArrayType);
  itkGetMacro(MaximumError, const ArrayType);

  itkGetMacro(MaximumKernelWidth, int);
  itkSetMacro(MaximumKernelWidth, int);

  itkGetMacro(FilterDimensionality, unsigned int);
  itkSetMacro(FilterDimensionality, unsigned int);

  void SetVariance (const typename ArrayType::ValueType v)
    {
    m_Variance.Fill(v);
    }

  void SetMaximumError (const typename ArrayType::ValueType v)
    {
    m_MaximumError.Fill(v);
    }

  void SetVariance (const double *v)
    {
    ArrayType dv;
    for (unsigned int i = 0; i < ImageDimension; i++)
      {
      dv[i] = v[i];
      }
    this->SetVariance(dv);
    }

  void SetVariance (const float *v)
    {
    ArrayType dv;
    for (unsigned int i = 0; i < ImageDimension; i++)
      {
      dv[i] = v[i];
      }
    this->SetVariance(dv);
    }

  void SetMaximumError (const double *v)
    {
    ArrayType dv;
    for (unsigned int i = 0; i < ImageDimension; i++)
      {
      dv[i] = v[i];
      }
    this->SetMaximumError(dv);
    }

  void SetMaximumError (const float *v)
    {
    ArrayType dv;
    for (unsigned int i = 0; i < ImageDimension; i++)
      {
      dv[i] = v[i];
      }
    this->SetMaximumError(dv);
    }

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

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

  itkSetMacro(UseImageSpacing, bool);
  itkGetMacro(UseImageSpacing, bool);

  virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(OutputHasNumericTraitsCheck,
    (Concept::HasNumericTraits<OutputPixelType>));

#endif

protected:
  DiscreteGaussianImageFilter()
    {
    m_Variance.Fill(0.0);
    m_MaximumError.Fill(0.01);
    m_MaximumKernelWidth = 32;
    m_UseImageSpacing = true;
    m_FilterDimensionality = ImageDimension;
    }
  virtual ~DiscreteGaussianImageFilter() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

  void GenerateData();

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

  ArrayType m_Variance;

  ArrayType m_MaximumError;

  int m_MaximumKernelWidth;

  unsigned int m_FilterDimensionality;

  bool m_UseImageSpacing;
};

} // end namespace itk

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

#endif