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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBinaryThinningImageFilter.h,v $
Language: C++
Date: $Date: 2008-02-03 04:05:28 $
Version: $Revision: 1.6 $
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 __itkBinaryThinningImageFilter_h
#define __itkBinaryThinningImageFilter_h
#include <itkNeighborhoodIterator.h>
#include <itkImageToImageFilter.h>
#include <itkImageRegionIteratorWithIndex.h>
namespace itk
{
/** \class BinaryThinningImageFilter
*
* \brief This filter computes one-pixel-wide edges of the input image.
*
* This class is parametrized over the type of the input image
* and the type of the output image.
*
* The input is assumed to be a binary image. If the foreground pixels
* of the input image do not have a value of 1, they are rescaled to 1
* internally to simplify the computation.
*
* The filter will produce a skeleton of the object. The output
* background values are 0, and the foreground values are 1.
*
* This filter is a sequential thinning algorithm and known to be computational time
* dependable on the image size. The algorithm corresponds with the 2D
* implementation described in:
*
* Rafael C. Gonzales and Richard E. Woods.
* Digital Image Processing.
* Addison Wesley, 491-494, (1993).
*
* To do: Make this filter ND.
*
* \sa MorphologyImageFilter
* \ingroup ImageEnhancement MathematicalMorphologyImageFilters
*/
template <class TInputImage,class TOutputImage>
class ITK_EXPORT BinaryThinningImageFilter :
public ImageToImageFilter<TInputImage,TOutputImage>
{
public:
/** Standard class typedefs. */
typedef BinaryThinningImageFilter Self;
typedef ImageToImageFilter<TInputImage,TOutputImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro( BinaryThinningImageFilter, ImageToImageFilter );
/** Type for input image. */
typedef TInputImage InputImageType;
/** Type for output image: Skelenton of the object. */
typedef TOutputImage OutputImageType;
/** Type for the region of the input image. */
typedef typename InputImageType::RegionType RegionType;
/** Type for the index of the input image. */
typedef typename RegionType::IndexType IndexType;
/** Type for the index of the input image. */
typedef typename InputImageType::PixelType PixelType ;
/** Type for the size of the input image. */
typedef typename RegionType::SizeType SizeType;
/** Pointer Type for input image. */
typedef typename InputImageType::ConstPointer InputImagePointer;
/** Pointer Type for the output image. */
typedef typename OutputImageType::Pointer OutputImagePointer;
/** Superclass typedefs. */
typedef typename Superclass::OutputImagePixelType OutputImagePixelType;
/** Neighborhood iterator type */
typedef NeighborhoodIterator<TInputImage> NeighborhoodIteratorType ;
/** Get Skelenton by thinning image. */
OutputImageType * GetThinning(void);
/** ImageDimension enumeration */
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension );
itkStaticConstMacro(OutputImageDimension, unsigned int,
TOutputImage::ImageDimension );
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(SameDimensionCheck,
(Concept::SameDimension<InputImageDimension, OutputImageDimension>));
itkConceptMacro(InputAdditiveOperatorsCheck,
(Concept::AdditiveOperators<PixelType>));
itkConceptMacro(InputConvertibleToIntCheck,
(Concept::Convertible<PixelType, int>));
itkConceptMacro(IntConvertibleToInputCheck,
(Concept::Convertible<int, PixelType>));
itkConceptMacro(SameTypeCheck,
(Concept::SameType<PixelType, typename TOutputImage::PixelType>));
itkConceptMacro(InputIntComparableCheck,
(Concept::Comparable<PixelType, int>));
/** End concept checking */
#endif
protected:
BinaryThinningImageFilter();
virtual ~BinaryThinningImageFilter() {};
/** Compute thinning Image. */
void GenerateData();
/** Prepare data. */
void PrepareData();
/** Compute thinning Image. */
void ComputeThinImage();
private:
BinaryThinningImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
}; // end of BinaryThinningImageFilter class
} //end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBinaryThinningImageFilter.txx"
#endif
#endif
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