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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBinaryThresholdImageFilter.h,v $
Language: C++
Date: $Date: 2007-01-22 21:18:18 $
Version: $Revision: 1.13 $
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 __itkBinaryThresholdImageFilter_h
#define __itkBinaryThresholdImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "itkConceptChecking.h"
#include "itkSimpleDataObjectDecorator.h"
namespace itk
{
/** \class BinaryThresholdImageFilter
*
* \brief Binarize an input image by thresholding.
*
* This filter produces an output image whose pixels
* are either one of two values ( OutsideValue or InsideValue ),
* depending on whether of not the corresponding input image pixel
* lie between the two thresholds ( LowerThreshold and UpperThreshold ).
* Values equal to either threshold is considered to be between the thresholds.
*
* More precisely
* \f[ Output(x_i) =
\begin{cases}
InsideValue & \text{if $LowerThreshold \leq x_i \leq UpperThreshold$} \ \
OutsideValue & \text{otherwise}
\end{cases}
\f]
*
* This filter is templated over the input image type
* and the output image type.
*
* The filter expect both images to have the same number of dimensions.
*
* \ingroup IntensityImageFilters Multithreaded
*/
namespace Functor {
template< class TInput, class TOutput>
class BinaryThreshold
{
public:
BinaryThreshold()
{
m_LowerThreshold = NumericTraits<TInput>::NonpositiveMin();
m_UpperThreshold = NumericTraits<TInput>::max();
m_OutsideValue = NumericTraits<TOutput>::Zero;
m_InsideValue = NumericTraits<TOutput>::max();
};
~BinaryThreshold() {};
void SetLowerThreshold( const TInput & thresh )
{ m_LowerThreshold = thresh; }
void SetUpperThreshold( const TInput & thresh )
{ m_UpperThreshold = thresh; }
void SetInsideValue( const TOutput & value )
{ m_InsideValue = value; }
void SetOutsideValue( const TOutput & value )
{ m_OutsideValue = value; }
bool operator!=( const BinaryThreshold & other ) const
{
if( m_LowerThreshold != other.m_LowerThreshold ||
m_UpperThreshold != other.m_UpperThreshold ||
m_InsideValue != other.m_InsideValue ||
m_OutsideValue != other.m_OutsideValue )
{
return true;
}
return false;
}
bool operator==( const BinaryThreshold & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput & A )
{
if ( m_LowerThreshold <= A && A <= m_UpperThreshold )
{
return m_InsideValue;
}
return m_OutsideValue;
}
private:
TInput m_LowerThreshold;
TInput m_UpperThreshold;
TOutput m_InsideValue;
TOutput m_OutsideValue;
};
}
template <class TInputImage, class TOutputImage>
class ITK_EXPORT BinaryThresholdImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::BinaryThreshold<
typename TInputImage::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef BinaryThresholdImageFilter Self;
typedef UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::BinaryThreshold<
typename TInputImage::PixelType,
typename TOutputImage::PixelType>
> 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(BinaryThresholdImageFilter, UnaryFunctorImageFilter);
/** Pixel types. */
typedef typename TInputImage::PixelType InputPixelType;
typedef typename TOutputImage::PixelType OutputPixelType;
/** Type of DataObjects to use for scalar inputs */
typedef SimpleDataObjectDecorator<InputPixelType> InputPixelObjectType;
/** Set the "outside" pixel value. The default value
* NumericTraits<OutputPixelType>::Zero. */
itkSetMacro(OutsideValue,OutputPixelType);
/** Get the "outside" pixel value. */
itkGetConstReferenceMacro(OutsideValue,OutputPixelType);
/** Set the "inside" pixel value. The default value
* NumericTraits<OutputPixelType>::max() */
itkSetMacro(InsideValue,OutputPixelType);
/** Get the "inside" pixel value. */
itkGetConstReferenceMacro(InsideValue,OutputPixelType);
/** Set the thresholds. The default lower threshold
* is NumericTraits<InputPixelType>::NonpositiveMin(). The default upper
* threshold is NumericTraits<InputPixelType>::max. An execption is thrown
* if the lower threshold is greater than the upper threshold. */
virtual void SetUpperThreshold(const InputPixelType threshold);
virtual void SetUpperThresholdInput( const InputPixelObjectType *);
virtual void SetLowerThreshold(const InputPixelType threshold);
virtual void SetLowerThresholdInput( const InputPixelObjectType *);
/** Get the threshold values. */
virtual InputPixelType GetUpperThreshold() const;
virtual InputPixelObjectType *GetUpperThresholdInput();
virtual const InputPixelObjectType *GetUpperThresholdInput() const;
virtual InputPixelType GetLowerThreshold() const;
virtual InputPixelObjectType *GetLowerThresholdInput();
virtual const InputPixelObjectType *GetLowerThresholdInput() const;
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(OutputEqualityComparableCheck,
(Concept::EqualityComparable<OutputPixelType>));
itkConceptMacro(InputPixelTypeComparable,
(Concept::Comparable<InputPixelType>));
itkConceptMacro(InputOStreamWritableCheck,
(Concept::OStreamWritable<InputPixelType>));
itkConceptMacro(OutputOStreamWritableCheck,
(Concept::OStreamWritable<OutputPixelType>));
/** End concept checking */
#endif
protected:
BinaryThresholdImageFilter();
virtual ~BinaryThresholdImageFilter() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** This method is used to set the state of the filter before
* multi-threading. */
virtual void BeforeThreadedGenerateData();
private:
BinaryThresholdImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
OutputPixelType m_InsideValue;
OutputPixelType m_OutsideValue;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBinaryThresholdImageFilter.txx"
#endif
#endif
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