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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkConnectedComponentImageFilter.h,v $
Language: C++
Date: $Date: 2007-10-05 10:31:58 $
Version: $Revision: 1.17 $
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 __itkConnectedComponentImageFilter_h
#define __itkConnectedComponentImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkConceptChecking.h"
#include <vector>
#include <map>
#include "itkProgressReporter.h"
namespace itk
{
/**
* \class ConnectedComponentImageFilter
* \brief Label the objects in a binary image
*
* ConnectedComponentImageFilter labels the objects in a binary image.
* Each distinct object is assigned a unique label. The filter experiments
* with some improvements to the existing implementation, and is based on
* run length encoding along raster lines.
* The final object labels start with 1 and are consecutive. Objects
* that are reached earlier by a raster order scan have a lower
* label. This is different to the behaviour of the original connected
* component image filter which did not produce consecutive labels or
* impose any particular ordering.
*
*
* \sa ImageToImageFilter
*
* \ingroup Singlethreaded
*/
template <class TInputImage, class TOutputImage, class TMaskImage=TInputImage>
class ITK_EXPORT ConnectedComponentImageFilter :
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/**
* Standard "Self" & Superclass typedef.
*/
typedef ConnectedComponentImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
/**
* Types from the Superclass
*/
typedef typename Superclass::InputImagePointer InputImagePointer;
/**
* Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same.
*/
typedef typename TOutputImage::PixelType OutputPixelType;
typedef typename TOutputImage::InternalPixelType OutputInternalPixelType;
typedef typename TInputImage::PixelType InputPixelType;
typedef typename TInputImage::InternalPixelType InputInternalPixelType;
typedef typename TMaskImage::PixelType MaskPixelType;
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension);
itkStaticConstMacro(OutputImageDimension, unsigned int,
TOutputImage::ImageDimension);
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension);
/**
* Image typedef support
*/
typedef TInputImage InputImageType;
typedef TMaskImage MaskImageType;
typedef typename TInputImage::IndexType IndexType;
typedef typename TInputImage::SizeType SizeType;
typedef typename TInputImage::OffsetType OffsetType;
typedef TOutputImage OutputImageType;
typedef typename TOutputImage::RegionType RegionType;
typedef typename TOutputImage::IndexType OutputIndexType;
typedef typename TOutputImage::SizeType OutputSizeType;
typedef typename TOutputImage::OffsetType OutputOffsetType;
typedef std::list<IndexType> ListType;
typedef typename MaskImageType::Pointer MaskImagePointer;
/**
* Smart pointer typedef support
*/
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/**
* Run-time type information (and related methods)
*/
itkTypeMacro(ConnectedComponentImageFilter, ImageToImageFilter);
/**
* Method for creation through the object factory.
*/
itkNewMacro(Self);
/**
* Set/Get whether the connected components are defined strictly by
* face connectivity or by face+edge+vertex connectivity. Default is
* FullyConnectedOff. For objects that are 1 pixel wide, use
* FullyConnectedOn.
*/
itkSetMacro(FullyConnected, bool);
itkGetConstReferenceMacro(FullyConnected, bool);
itkBooleanMacro(FullyConnected);
// only set after completion
itkGetConstReferenceMacro(ObjectCount, unsigned long);
// Concept checking -- input and output dimensions must be the same
itkConceptMacro(SameDimension,
(Concept::SameDimension<itkGetStaticConstMacro(InputImageDimension),
itkGetStaticConstMacro(OutputImageDimension)>));
void SetMaskImage(TMaskImage* mask)
{
this->SetNthInput(1, const_cast<TMaskImage *>( mask ));
}
const TMaskImage* GetMaskImage() const
{
return (static_cast<const TMaskImage*>(this->ProcessObject::GetInput(1)));
}
protected:
ConnectedComponentImageFilter()
{
m_FullyConnected = false;
m_ObjectCount = 0;
}
virtual ~ConnectedComponentImageFilter() {}
ConnectedComponentImageFilter(const Self&) {}
void PrintSelf(std::ostream& os, Indent indent) const;
/**
* Standard pipeline method.
*/
void GenerateData();
/** ConnectedComponentImageFilter needs the entire input. Therefore
* it must provide an implementation GenerateInputRequestedRegion().
* \sa ProcessObject::GenerateInputRequestedRegion(). */
void GenerateInputRequestedRegion();
/** ConnectedComponentImageFilter will produce all of the output.
* Therefore it must provide an implementation of
* EnlargeOutputRequestedRegion().
* \sa ProcessObject::EnlargeOutputRequestedRegion() */
void EnlargeOutputRequestedRegion(DataObject *itkNotUsed(output));
bool m_FullyConnected;
private:
unsigned long m_ObjectCount;
// some additional types
typedef typename TOutputImage::RegionType::SizeType OutSizeType;
// types to support the run length encoding of lines
class runLength
{
public:
// run length information - may be a more type safe way of doing this
long int length;
typename InputImageType::IndexType where; // Index of the start of the run
unsigned long int label; // the initial label of the run
};
typedef std::vector<runLength> lineEncoding;
// the map storing lines
typedef std::map<long, lineEncoding> LineMapType;
typedef std::vector<long> OffsetVec;
// the types to support union-find operations
typedef std::vector<unsigned long int> UnionFindType;
UnionFindType m_UnionFind;
UnionFindType m_Consecutive;
// functions to support union-find operations
void InitUnion(const unsigned long int size)
{
m_UnionFind = UnionFindType(size + 1);
}
void InsertSet(const unsigned long int label);
unsigned long int LookupSet(const unsigned long int label);
void LinkLabels(const unsigned long int lab1, const unsigned long int lab2);
unsigned long int CreateConsecutive();
//////////////////
bool CheckNeighbors(const OutputIndexType &A,
const OutputIndexType &B);
void CompareLines(lineEncoding ¤t, const lineEncoding &Neighbour);
void FillOutput(const LineMapType &LineMap,
ProgressReporter &progress);
void SetupLineOffsets(OffsetVec &LineOffsets);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkConnectedComponentImageFilter.txx"
#endif
#endif
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