itkZeroCrossingBasedEdgeDetectionImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkZeroCrossingBasedEdgeDetectionImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2002/09/11 19:39:03 $
  Version:   $Revision: 1.9 $

  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 __itkZeroCrossingBasedEdgeDetectionImageFilter_h
#define __itkZeroCrossingBasedEdgeDetectionImageFilter_h

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


namespace itk
{
  
template<class TInputImage, class TOutputImage>
class ITK_EXPORT ZeroCrossingBasedEdgeDetectionImageFilter
  : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  typedef ZeroCrossingBasedEdgeDetectionImageFilter    Self;
  typedef ImageToImageFilter<TInputImage, TOutputImage> Superclass;
  
  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
  
  typedef SmartPointer<Self>  Pointer;
  typedef SmartPointer<const Self>  ConstPointer;
  
  typedef typename TInputImage::PixelType  InputImagePixelType;
  typedef typename TOutputImage::PixelType  OutputImagePixelType;
  
  itkNewMacro(Self);  
  
  typedef typename TOutputImage::RegionType OutputImageRegionType;
  
  itkTypeMacro(ZeroCrossingBasedEdgeDetectionImageFilter, ImageToImageFilter);
  
  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension );
  
  itkSetVectorMacro(Variance, double, ImageDimension);
  itkGetVectorMacro(Variance, const double, ImageDimension);
  itkSetVectorMacro(MaximumError, double, ImageDimension);
  itkGetVectorMacro(MaximumError, const double, ImageDimension);

  itkGetMacro(BackgroundValue, OutputImagePixelType);
  itkSetMacro(BackgroundValue, OutputImagePixelType);
  itkGetMacro(ForegroundValue, OutputImagePixelType);
  itkSetMacro(ForegroundValue, OutputImagePixelType);
  
  void SetVariance(const double v)
    {
      double vArray[ImageDimension];
      for (unsigned int i = 0; i<ImageDimension; ++i) { vArray[i] = v; }
      this->SetVariance(vArray);
    }
  
  void SetMaximumError(const double v)
    {
      double vArray[ImageDimension];
      for (unsigned int i = 0; i<ImageDimension; ++i) { vArray[i] = v; }
      this->SetMaximumError(vArray);
    }
  
  //  virtual void GenerateInputRequestedRegion()
  //  throw(InvalidRequestedRegionError);
  
protected:
  ZeroCrossingBasedEdgeDetectionImageFilter()
    {
      this->SetVariance(1.0f);
      this->SetMaximumError(0.01f);
      m_BackgroundValue = NumericTraits<OutputImagePixelType>::Zero;
      m_ForegroundValue = NumericTraits<OutputImagePixelType>::One;
    }
  ~ZeroCrossingBasedEdgeDetectionImageFilter(){}
  ZeroCrossingBasedEdgeDetectionImageFilter(const Self&) {}
  void PrintSelf(std::ostream& os, Indent indent) const;
  
  void GenerateData();
  
private:
  double m_Variance[ImageDimension];

  double m_MaximumError[ImageDimension];
 
  OutputImagePixelType m_BackgroundValue;
  OutputImagePixelType m_ForegroundValue;
};
  
} //end of namespace itk

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

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