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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkDoubleThresholdImageFilter.h
Language: C++
Date: $Date$
Version: $Revision$
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 __itkDoubleThresholdImageFilter_h
#define __itkDoubleThresholdImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkConceptChecking.h"
namespace itk
{
/** \class DoubleThresholdImageFilter
* \brief Binarize an input image using double thresholding.
*
* Double threshold addresses the difficulty in selecting a threshold
* that will select the objects of interest without selecting
* extraneous objects. Double threshold considers two threshold
* ranges: a narrow range and a wide range (where the wide range
* encompasses the narrow range). If the wide range was used for a
* traditional threshold (where values inside the range map to the
* foreground and values outside the range map to the background),
* many extraneous pixels may survive the threshold operation. If the
* narrow range was used for a traditional threshold, then too few
* pixels may survive the threshold.
*
* Double threshold uses the narrow threshold image as a marker image
* and the wide threshold image as a mask image in the geodesic
* dilation. Essentially, the marker image (narrow threshold) is
* dilated but constrained to lie within the mask image (wide
* threshold). Thus, only the objects of interest (those pixels that
* survived the narrow threshold) are extracted but the those objects
* appear in the final image as they would have if the wide threshold
* was used.
*
* \sa GrayscaleGeodesicDilateImageFilter
* \sa MorphologyImageFilter, GrayscaleDilateImageFilter, GrayscaleFunctionDilateImageFilter, BinaryDilateImageFilter
* \ingroup ImageEnhancement MathematicalMorphologyImageFilters
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT DoubleThresholdImageFilter :
public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
/** Standard class typedefs. */
typedef DoubleThresholdImageFilter 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(DoubleThresholdImageFilter, ImageToImageFilter);
/** Types from the superclass */
typedef typename Superclass::InputImagePointer InputImagePointer;
typedef typename Superclass::InputImageType InputImageType;
/** Pixel types. */
typedef typename TInputImage::PixelType InputPixelType;
typedef typename TOutputImage::PixelType OutputPixelType;
/** Set the "outside" pixel value. The default value
* NumericTraits<OutputPixelType>::Zero. */
itkSetMacro(OutsideValue,OutputPixelType);
/** Get the "outside" pixel value. */
itkGetConstMacro(OutsideValue,OutputPixelType);
/** Set the "inside" pixel value. The default value
* NumericTraits<OutputPixelType>::max() */
itkSetMacro(InsideValue,OutputPixelType);
/** Get the "inside" pixel value. */
itkGetConstMacro(InsideValue,OutputPixelType);
/** Set the thresholds. Four thresholds should be specified. The
* two lower thresholds default to
* NumericTraits<InputPixelType>::NonpositiveMin(). The two upper
* thresholds default NumericTraits<InputPixelType>::max.
* Threshold1 <= Threshold2 <= Threshold3 <= Threshold4. */
itkSetMacro( Threshold1, InputPixelType );
itkSetMacro( Threshold2, InputPixelType );
itkSetMacro( Threshold3, InputPixelType );
itkSetMacro( Threshold4, InputPixelType );
/** Get the threshold values. */
itkGetConstMacro( Threshold1, InputPixelType );
itkGetConstMacro( Threshold2, InputPixelType );
itkGetConstMacro( Threshold3, InputPixelType );
itkGetConstMacro( Threshold4, InputPixelType );
/** \deprecated
* Get the number of iterations used by the geodesic dilation to
* produce the current output. This method is scheduled for removal
* since the implementation now uses a noniterative solution. */
unsigned long GetNumberOfIterationsUsed()
{
itkLegacyBodyMacro(itk::DoubleThresholdImageFilter::GetNumberOfIterationsUsed, 2.2);
return m_NumberOfIterationsUsed;
};
/**
* 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);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(OutputEqualityComparableCheck,
(Concept::EqualityComparable<OutputPixelType>));
itkConceptMacro(InputComparableCheck,
(Concept::Comparable<InputPixelType>));
itkConceptMacro(InputOStreamWritableCheck,
(Concept::OStreamWritable<InputPixelType>));
itkConceptMacro(OutputOStreamWritableCheck,
(Concept::OStreamWritable<OutputPixelType>));
/** End concept checking */
#endif
protected:
DoubleThresholdImageFilter();
virtual ~DoubleThresholdImageFilter() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** DoubleThresholdImageFilter needs all of the input. So it must
* provide an implementation of GenerateInputRequestedRegion() */
void GenerateInputRequestedRegion();
/** DoubleThresholdImageFilter produces all of the output and must
* provide an implementation of EnlargeOutputRequestedRegion() */
void EnlargeOutputRequestedRegion(DataObject *itkNotUsed(output));
/** Single threaded version of
* GenerateData(). DoubleThresholdImageFilter delegates its
* implementation to the GrayscaleGeodesicDilateImageFilter. */
void GenerateData();
private:
DoubleThresholdImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
InputPixelType m_Threshold1;
InputPixelType m_Threshold2;
InputPixelType m_Threshold3;
InputPixelType m_Threshold4;
OutputPixelType m_InsideValue;
OutputPixelType m_OutsideValue;
unsigned long m_NumberOfIterationsUsed;
bool m_FullyConnected;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkDoubleThresholdImageFilter.txx"
#endif
#endif
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