itkZeroCrossingBasedEdgeDetectionImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkZeroCrossingBasedEdgeDetectionImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-07 17:31:02 $
  Version:   $Revision: 1.18 $

  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 __itkZeroCrossingBasedEdgeDetectionImageFilter_h
#define __itkZeroCrossingBasedEdgeDetectionImageFilter_h

#include "itkImageToImageFilter.h"
#include "itkFixedArray.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 );
  itkStaticConstMacro(OutputImageDimension, 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(BackgroundValue, OutputImagePixelType);
  itkSetMacro(BackgroundValue, OutputImagePixelType);
  itkGetMacro(ForegroundValue, OutputImagePixelType);
  itkSetMacro(ForegroundValue, OutputImagePixelType);

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

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

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(OutputEqualityComparableCheck,
    (Concept::EqualityComparable<OutputImagePixelType>));
  itkConceptMacro(SameDimensionCheck,
    (Concept::SameDimension<ImageDimension, OutputImageDimension>));
  itkConceptMacro(SameTypeCheck,
    (Concept::SameType<InputImagePixelType, OutputImagePixelType>));
  itkConceptMacro(OutputOStreamWritableCheck,
    (Concept::OStreamWritable<OutputImagePixelType>));
  itkConceptMacro(PixelTypeIsFloatingPointCheck,
    (Concept::IsFloatingPoint<InputImagePixelType>));

#endif

protected:
  ZeroCrossingBasedEdgeDetectionImageFilter()
    {
    m_Variance.Fill(1.0);
    m_MaximumError.Fill(0.01);
    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:
  ArrayType m_Variance;

  ArrayType m_MaximumError;

  OutputImagePixelType m_BackgroundValue;
  OutputImagePixelType m_ForegroundValue;
};
  
} //end of namespace itk

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

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