itkWatershedImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkWatershedImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2005/01/12 23:09:39 $
  Version:   $Revision: 1.42 $

  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 __itkWatershedImageFilter_h
#define __itkWatershedImageFilter_h

#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif

#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkWatershedSegmenter.h"
#include "itkWatershedSegmentTreeGenerator.h"
#include "itkWatershedRelabeler.h"
#include "itkWatershedMiniPipelineProgressCommand.h"

namespace itk
{
template <class TInputImage>
class ITK_EXPORT WatershedImageFilter :
    public ImageToImageFilter< TInputImage, Image<unsigned long,
                                                  ::itk::GetImageDimension<TInputImage>::ImageDimension> >
{
public:
  typedef WatershedImageFilter Self;

  typedef TInputImage InputImageType;

  itkStaticConstMacro (ImageDimension, unsigned int,
                       TInputImage::ImageDimension);
  
  typedef Image<unsigned long, itkGetStaticConstMacro(ImageDimension)> OutputImageType;

  typedef typename InputImageType::RegionType RegionType;
  typedef typename InputImageType::SizeType   SizeType;
  typedef typename InputImageType::IndexType  IndexType;
  
  typedef ImageToImageFilter< InputImageType, OutputImageType > Superclass;

  typedef typename InputImageType::PixelType ScalarType;

  typedef SmartPointer<Self> Pointer;

  itkTypeMacro(WatershedImageFilter, ImageToImageFilter);
  
  itkNewMacro(Self);

  void GenerateData();

  void SetInput(const InputImageType *input)
    {
    // if the input is changed, we'll need to clear the cached tree
    // when we execute
    if (input != this->GetInput(0))
      {
      m_InputChanged = true;
      }
      
    // processObject is not const-correct so a const_cast is needed here
    this->ProcessObject::SetNthInput(0, const_cast<InputImageType *>(input));
    m_Segmenter->SetInputImage( const_cast<InputImageType *>( input ) );
    }

  virtual void SetInput( unsigned int i, const TInputImage * image)
  {
    if (i != 0)
      { itkExceptionMacro(<< "Filter has only one input."); }
    else
      { this->SetInput(image); }
  }
  void SetThreshold(double);
  itkGetMacro(Threshold, double);
  
  void SetLevel(double);
  itkGetMacro(Level, double);

  typename watershed::Segmenter<InputImageType>::OutputImageType *
  GetBasicSegmentation()
  {
    m_Segmenter->Update();
    return m_Segmenter->GetOutputImage();
  }

  typename watershed::SegmentTreeGenerator<ScalarType>::SegmentTreeType *
  GetSegmentTree()
  {
    return m_TreeGenerator->GetOutputSegmentTree();
  }
   
  // Override since the filter produces all of its output
  void EnlargeOutputRequestedRegion(DataObject *data);

protected:
  WatershedImageFilter();
  virtual ~WatershedImageFilter() {}
  WatershedImageFilter(const Self&) {}
  void operator=(const Self&) {}
  void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void PrepareOutputs();
  
private:
  double m_Threshold;

  double m_Level;

  typename watershed::Segmenter<InputImageType>::Pointer m_Segmenter;
  typename watershed::SegmentTreeGenerator<ScalarType>::Pointer m_TreeGenerator;
  typename watershed::Relabeler<ScalarType, itkGetStaticConstMacro(ImageDimension)>::Pointer m_Relabeler;

  unsigned long m_ObserverTag;

  bool m_LevelChanged;
  bool m_ThresholdChanged;
  bool m_InputChanged;
  TimeStamp m_GenerateDataMTime;
};

} // end namespace itk

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

#endif

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