itkWatershedImageFilter.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkWatershedImageFilter_h
#define __itkWatershedImageFilter_h


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

namespace itk
{
template< typename TInputImage >
class WatershedImageFilter:
  public ImageToImageFilter< TInputImage, Image< IdentifierType,
                                                 TInputImage::ImageDimension > >
{
public:
  typedef WatershedImageFilter Self;

  typedef TInputImage InputImageType;

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

  typedef Image< IdentifierType, 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();

  using Superclass::SetInput;
  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);

  itkGetConstMacro(Threshold, double);

  void SetLevel(double);

  itkGetConstMacro(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);

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputEqualityComparableCheck,
                   ( Concept::EqualityComparable< ScalarType > ) );
  itkConceptMacro( InputAdditiveOperatorsCheck,
                   ( Concept::AdditiveOperators< ScalarType > ) );
  itkConceptMacro( DoubleInputMultiplyOperatorCheck,
                   ( Concept::MultiplyOperator< double, ScalarType, ScalarType > ) );
  itkConceptMacro( InputLessThanComparableCheck,
                   ( Concept::LessThanComparable< ScalarType > ) );
  // End concept checking
#endif

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

  virtual void PrepareOutputs();

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

  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.hxx"
#endif

#endif