itkRelabelComponentImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkRelabelComponentImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2005/08/03 18:50:05 $
  Version:   $Revision: 1.12 $

  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 __itkRelabelComponentImageFilter_h
#define __itkRelabelComponentImageFilter_h

#include "itkInPlaceImageFilter.h"
#include "itkImage.h"
#include <vector>

namespace itk
{

template <class TInputImage, class TOutputImage>
class ITK_EXPORT RelabelComponentImageFilter : 
    public InPlaceImageFilter< TInputImage, TOutputImage > 
{
public:
  typedef RelabelComponentImageFilter Self;
  typedef InPlaceImageFilter< TInputImage, TOutputImage > Superclass;

  typedef typename Superclass::InputImagePointer InputImagePointer;

  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 TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
  typedef   typename TInputImage::IndexType       IndexType;
  typedef   typename TInputImage::SizeType        SizeType;
  typedef   typename TOutputImage::RegionType     RegionType;

  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self>  ConstPointer;
  
  itkTypeMacro(RelabelComponentImageFilter, ImageToImageFilter);
  
  itkNewMacro(Self);

  itkGetMacro(NumberOfObjects, unsigned long);
  
  itkGetMacro(OriginalNumberOfObjects, unsigned long);

  itkSetMacro(NumberOfObjectsToPrint, unsigned long);
  itkGetConstReferenceMacro(NumberOfObjectsToPrint, unsigned long);

  itkSetMacro(MinimumObjectSize, unsigned long);

  itkGetMacro(MinimumObjectSize, unsigned long);
   
  const std::vector<unsigned long>& GetSizeOfObjectsInPixels() const
    { return m_SizeOfObjectsInPixels; }

  const std::vector<float>& GetSizeOfObjectsInPhysicalUnits() const
    { return m_SizeOfObjectsInPhysicalUnits; }

  unsigned long GetSizeOfObjectInPixels(unsigned long obj) const
    {
      if (obj > 0 && obj <= m_NumberOfObjects)
        {
        return m_SizeOfObjectsInPixels[obj-1];
        }
      else
        {
        return 0;
        }
    }

  float GetSizeOfObjectInPhysicalUnits(unsigned long obj) const
    { 
      if (obj > 0 && obj <= m_NumberOfObjects)
        {
        return m_SizeOfObjectsInPhysicalUnits[obj-1];
        }
      else
        {
        return 0;
        }
    }  

  
protected:

  RelabelComponentImageFilter()
    : m_NumberOfObjects(0), m_NumberOfObjectsToPrint(10),
    m_OriginalNumberOfObjects(0), m_MinimumObjectSize(0)
    { this->InPlaceOff(); }
  virtual ~RelabelComponentImageFilter() {}
  RelabelComponentImageFilter(const Self&) {}

  void GenerateData();

  void GenerateInputRequestedRegion();

  void PrintSelf(std::ostream& os, Indent indent) const;

  struct RelabelComponentObjectType
  {
    unsigned long m_ObjectNumber;
    unsigned long m_SizeInPixels;
    float m_SizeInPhysicalUnits;
  };

  // put the function objects here for sorting in descending order
  class RelabelComponentSizeInPixelsComparator
  {
  public:
    bool operator()(const RelabelComponentObjectType&a, 
                    const RelabelComponentObjectType &b)
      {
        if (a.m_SizeInPixels > b.m_SizeInPixels)
          {
          return true;
          }
        else if (a.m_SizeInPixels < b.m_SizeInPixels)
          {
          return false;
          }
        // size in pixels and physical units are the same, sort based on
        // original object number
        else if (a.m_ObjectNumber < b.m_ObjectNumber)
          {
          return true;
          }
        else
          {
          return false;
          }
      }
  };


private:

  unsigned long m_NumberOfObjects;
  unsigned long m_NumberOfObjectsToPrint;
  unsigned long m_OriginalNumberOfObjects;
  unsigned long m_MinimumObjectSize;
  std::vector<unsigned long> m_SizeOfObjectsInPixels;
  std::vector<float> m_SizeOfObjectsInPhysicalUnits;

};
  
} // end namespace itk

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

#endif

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