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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkRescaleIntensityImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:41 $
Version: $Revision: 1.15 $
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 __itkRescaleIntensityImageFilter_h
#define __itkRescaleIntensityImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
// This functor class applies a linear transformation A.x + B
// to input values.
namespace Functor {
template< typename TInput, typename TOutput>
class IntensityLinearTransform
{
public:
typedef typename NumericTraits< TInput >::RealType RealType;
IntensityLinearTransform()
{
m_Factor = 1.0;
m_Offset = 0.0;
m_Minimum = NumericTraits<TOutput>::NonpositiveMin();
m_Maximum = NumericTraits<TOutput>::max();
}
~IntensityLinearTransform() {}
void SetFactor( RealType a ) { m_Factor = a; }
void SetOffset( RealType b ) { m_Offset = b; }
void SetMinimum( TOutput min ) { m_Minimum = min; }
void SetMaximum( TOutput max ) { m_Maximum = max; }
bool operator!=( const IntensityLinearTransform & other ) const
{
if( m_Factor != other.m_Factor ||
m_Offset != other.m_Offset ||
m_Maximum != other.m_Maximum ||
m_Minimum != other.m_Minimum )
{
return true;
}
return false;
}
bool operator==( const IntensityLinearTransform & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput & x )
{
RealType value = static_cast<RealType>(x) * m_Factor + m_Offset;
TOutput result = static_cast<TOutput>( value );
result = ( result > m_Maximum ) ? m_Maximum : result;
result = ( result < m_Minimum ) ? m_Minimum : result;
return result;
}
private:
RealType m_Factor;
RealType m_Offset;
TOutput m_Maximum;
TOutput m_Minimum;
};
} // end namespace functor
/** \class RescaleIntensityImageFilter
* \brief Applies a linear transformation to the intensity levels of the
* input Image.
*
* RescaleIntensityImageFilter 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.
*
* All computations are performed in the precison of the input pixel's
* RealType. Before assigning the computed value to the output pixel.
*
* NOTE: In this filter the minimum and maximum values of the input image are
* computed internally using the MinimumMaximumImageCalculator. Users are not
* supposed to set those values in this filter. If you need a filter where you
* can set the minimum and maximum values of the input, please use the
* IntensityWindowingImageFilter. If you want a filter that can use a
* user-defined linear transformation for the intensity, then please use teh
* ShiftScaleImageFilter.
*
* \sa IntensityWindowingImageFilter
*
* \ingroup IntensityImageFilters Multithreaded
*
*/
template <typename TInputImage, typename TOutputImage=TInputImage>
class ITK_EXPORT RescaleIntensityImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::IntensityLinearTransform<
typename TInputImage::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef RescaleIntensityImageFilter Self;
typedef UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::IntensityLinearTransform<
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(RescaleIntensityImageFilter,
UnaryFunctorImageFilter);
itkSetMacro( OutputMinimum, OutputPixelType );
itkSetMacro( OutputMaximum, OutputPixelType );
itkGetConstReferenceMacro( OutputMinimum, OutputPixelType );
itkGetConstReferenceMacro( OutputMaximum, OutputPixelType );
/** 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 );
/** Get the Minimum and Maximum values of the input image.
\warning These Values are only valid after the filter has been updated */
itkGetConstReferenceMacro( InputMinimum, InputPixelType );
itkGetConstReferenceMacro( InputMaximum, InputPixelType );
/** 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>));
itkConceptMacro(OutputHasNumericTraitsCheck,
(Concept::HasNumericTraits<OutputPixelType>));
itkConceptMacro(RealTypeMultiplyOperatorCheck,
(Concept::MultiplyOperator<RealType>));
itkConceptMacro(RealTypeAdditiveOperatorsCheck,
(Concept::AdditiveOperators<RealType>));
/** End concept checking */
#endif
protected:
RescaleIntensityImageFilter();
virtual ~RescaleIntensityImageFilter() {};
private:
RescaleIntensityImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
RealType m_Scale;
RealType m_Shift;
InputPixelType m_InputMinimum;
InputPixelType m_InputMaximum;
OutputPixelType m_OutputMinimum;
OutputPixelType m_OutputMaximum;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkRescaleIntensityImageFilter.txx"
#endif
#endif
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