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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkIntensityWindowingImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:40 $
Version: $Revision: 1.8 $
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 __itkIntensityWindowingImageFilter_h
#define __itkIntensityWindowingImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
// This functor class applies a linear transformation A.x + B inside a specified
// range. Values below the range are mapped to a constant. Values over the range
// are mapped to another constant.
namespace Functor {
template< typename TInput, typename TOutput>
class IntensityWindowingTransform
{
public:
typedef typename NumericTraits< TInput >::RealType RealType;
IntensityWindowingTransform() {}
~IntensityWindowingTransform() {}
bool operator!=( const IntensityWindowingTransform & other ) const
{
if( m_Factor != other.m_Factor ||
m_Offset != other.m_Offset ||
m_OutputMaximum != other.m_OutputMaximum ||
m_OutputMinimum != other.m_OutputMinimum ||
m_WindowMaximum != other.m_WindowMaximum ||
m_WindowMinimum != other.m_WindowMinimum )
{
return true;
}
return false;
}
bool operator==( const IntensityWindowingTransform & other ) const
{
return !(*this != other);
}
void SetFactor( RealType a ) { m_Factor = a; }
void SetOffset( RealType b ) { m_Offset = b; }
void SetOutputMinimum( TOutput min ) { m_OutputMinimum = min; }
void SetOutputMaximum( TOutput max ) { m_OutputMaximum = max; }
void SetWindowMinimum( TInput min ) { m_WindowMinimum = min; }
void SetWindowMaximum( TInput max ) { m_WindowMaximum = max; }
inline TOutput operator()( const TInput & x )
{
if( x < m_WindowMinimum )
{
return m_OutputMinimum;
}
if( x > m_WindowMaximum )
{
return m_OutputMaximum;
}
const RealType value = static_cast<RealType>(x) * m_Factor + m_Offset;
const TOutput result = static_cast<TOutput>( value );
return result;
}
private:
RealType m_Factor;
RealType m_Offset;
TOutput m_OutputMaximum;
TOutput m_OutputMinimum;
TInput m_WindowMaximum;
TInput m_WindowMinimum;
};
} // end namespace functor
/** \class IntensityWindowingImageFilter
* \brief Applies a linear transformation to the intensity levels of the
* input Image that are inside a user-defined interval. Values below this
* interval are mapped to a constant. Values over the interval are mapped
* to another constant.
*
* IntensityWindowingImageFilter applies pixel-wise a linear transformation
* to the intensity values of input image pixels. The linear transformation
* is defined by the user in terms of the minimum and maximum values that
* the output image should have and the lower and upper limits of the intensity
* window of the input image. This operation is very common in visualization,
* and can also be applied as a convenient preprocessing operation for image
* segmentation.
*
* All computations are performed in the precison of the input pixel's
* RealType. Before assigning the computed value to the output pixel.
*
* \ingroup IntensityImageFilters Multithreaded
*
*/
template <typename TInputImage, typename TOutputImage=TInputImage>
class ITK_EXPORT IntensityWindowingImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::IntensityWindowingTransform<
typename TInputImage::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef IntensityWindowingImageFilter Self;
typedef UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::IntensityWindowingTransform<
typename TInputImage::PixelType,
typename TOutputImage::PixelType> > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
typedef typename TOutputImage::PixelType OutputPixelType;
typedef typename TInputImage::PixelType InputPixelType;
typedef typename NumericTraits<InputPixelType>::RealType RealType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(IntensityWindowingImageFilter,
UnaryFunctorImageFilter);
/** Set/Get the values of the maximum and minimum
* intensities of the outputimage */
itkSetMacro( OutputMinimum, OutputPixelType );
itkSetMacro( OutputMaximum, OutputPixelType );
itkGetConstReferenceMacro( OutputMinimum, OutputPixelType );
itkGetConstReferenceMacro( OutputMaximum, OutputPixelType );
/** Set/Get the values of the maximum and minimum
* intensities of the input intensity window */
itkSetMacro( WindowMinimum, InputPixelType );
itkSetMacro( WindowMaximum, InputPixelType );
itkGetConstReferenceMacro( WindowMinimum, InputPixelType );
itkGetConstReferenceMacro( WindowMaximum, InputPixelType );
/** Set/Get the window width and level. This is an alternative API
* to using the SetWindowMinimum()/SetWindowMaximum(). The window
* minimum and maximum are set as [level-window/2,
* level+window/2]. */
void SetWindowLevel(const InputPixelType& window,
const InputPixelType& level);
InputPixelType GetWindow() const;
InputPixelType GetLevel() const;
/** Get the Scale and Shift used for the linear transformation
of gray level values.
\warning These Values are only valid after the filter has been updated */
itkGetConstReferenceMacro( Scale, RealType );
itkGetConstReferenceMacro( Shift, RealType );
/** Process to execute before entering the multithreaded section */
void BeforeThreadedGenerateData(void);
/** Print internal ivars */
void PrintSelf(std::ostream& os, Indent indent) const;
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<InputPixelType>));
/** End concept checking */
#endif
protected:
IntensityWindowingImageFilter();
virtual ~IntensityWindowingImageFilter() {};
private:
IntensityWindowingImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
RealType m_Scale;
RealType m_Shift;
InputPixelType m_WindowMinimum;
InputPixelType m_WindowMaximum;
OutputPixelType m_OutputMinimum;
OutputPixelType m_OutputMaximum;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkIntensityWindowingImageFilter.txx"
#endif
#endif
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