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itkRescaleIntensityImageFilter.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkRescaleIntensityImageFilter.h,v $
00005   Language:  C++
00006   Date:      $Date: 2006/03/31 14:31:04 $
00007   Version:   $Revision: 1.13 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __itkRescaleIntensityImageFilter_h
00018 #define __itkRescaleIntensityImageFilter_h
00019 
00020 #include "itkUnaryFunctorImageFilter.h"
00021 
00022 namespace itk
00023 {
00024 
00025 // This functor class applies a linear transformation A.x + B 
00026 // to input values.
00027 namespace Functor {  
00028  
00029 template< typename TInput, typename  TOutput>
00030 class IntensityLinearTransform
00031 {
00032 public:
00033   typedef typename NumericTraits< TInput >::RealType RealType;
00034   IntensityLinearTransform() {}
00035   ~IntensityLinearTransform() {}
00036   void SetFactor( RealType a ) { m_Factor = a; }
00037   void SetOffset( RealType b ) { m_Offset = b; }
00038   void SetMinimum( TOutput min ) { m_Minimum = min; }
00039   void SetMaximum( TOutput max ) { m_Maximum = max; }
00040   bool operator!=( const IntensityLinearTransform & other ) const
00041   {
00042     if( m_Factor != other.m_Factor ||
00043         m_Offset != other.m_Offset ||
00044         m_Maximum != other.m_Maximum    ||
00045         m_Minimum != other.m_Minimum )
00046       {
00047       return true;
00048       }
00049     return false;
00050    }
00051   bool operator==( const IntensityLinearTransform & other ) const
00052   {
00053     return !(*this != other);
00054   }
00055   inline TOutput operator()( const TInput & x )
00056   {
00057     RealType value  = static_cast<RealType>(x) * m_Factor + m_Offset;
00058     TOutput  result = static_cast<TOutput>( value );
00059     result = ( result > m_Maximum ) ? m_Maximum : result;
00060     result = ( result < m_Minimum ) ? m_Minimum : result;
00061     return result;
00062   }
00063 private:
00064   RealType m_Factor;
00065   RealType m_Offset;
00066   TOutput  m_Maximum;
00067   TOutput  m_Minimum;
00068 }; 
00069 
00070 }  // end namespace functor
00071 
00072 
00098 template <typename  TInputImage, typename  TOutputImage=TInputImage>
00099 class ITK_EXPORT RescaleIntensityImageFilter :
00100     public
00101 UnaryFunctorImageFilter<TInputImage,TOutputImage, 
00102                         Functor::IntensityLinearTransform< 
00103   typename TInputImage::PixelType, 
00104   typename TOutputImage::PixelType>   >
00105 {
00106 public:
00108   typedef RescaleIntensityImageFilter  Self;
00109   typedef UnaryFunctorImageFilter<TInputImage,TOutputImage, 
00110                                   Functor::IntensityLinearTransform< 
00111     typename TInputImage::PixelType, 
00112     typename TOutputImage::PixelType> >  Superclass;
00113   typedef SmartPointer<Self>   Pointer;
00114   typedef SmartPointer<const Self>  ConstPointer;
00115 
00116   typedef typename TOutputImage::PixelType OutputPixelType;
00117   typedef typename TInputImage::PixelType  InputPixelType;
00118   typedef typename NumericTraits<InputPixelType>::RealType RealType;
00119 
00121   itkNewMacro(Self);
00122 
00123   itkSetMacro( OutputMinimum, OutputPixelType );
00124   itkSetMacro( OutputMaximum, OutputPixelType );
00125   itkGetConstReferenceMacro( OutputMinimum, OutputPixelType );
00126   itkGetConstReferenceMacro( OutputMaximum, OutputPixelType );
00127 
00131   itkGetConstReferenceMacro( Scale, RealType );
00132   itkGetConstReferenceMacro( Shift, RealType );
00134 
00137   itkGetConstReferenceMacro( InputMinimum, InputPixelType );
00138   itkGetConstReferenceMacro( InputMaximum, InputPixelType );
00140 
00142   void BeforeThreadedGenerateData(void);
00143 
00145   void PrintSelf(std::ostream& os, Indent indent) const;
00146 
00147 #ifdef ITK_USE_CONCEPT_CHECKING
00148 
00149   itkConceptMacro(InputHasNumericTraitsCheck,
00150                   (Concept::HasNumericTraits<InputPixelType>));
00151   itkConceptMacro(OutputHasNumericTraitsCheck,
00152                   (Concept::HasNumericTraits<OutputPixelType>));
00153   itkConceptMacro(RealTypeMultiplyOperatorCheck,
00154                   (Concept::MultiplyOperator<RealType>));
00155   itkConceptMacro(RealTypeAdditiveOperatorsCheck,
00156                   (Concept::AdditiveOperators<RealType>));
00157 
00159 #endif
00160 
00161 protected:
00162   RescaleIntensityImageFilter();
00163   virtual ~RescaleIntensityImageFilter() {};
00164 
00165 private:
00166   RescaleIntensityImageFilter(const Self&); //purposely not implemented
00167   void operator=(const Self&); //purposely not implemented
00168 
00169   RealType m_Scale;
00170   RealType m_Shift;
00171 
00172   InputPixelType        m_InputMinimum;
00173   InputPixelType        m_InputMaximum;
00174 
00175   OutputPixelType       m_OutputMinimum;
00176   OutputPixelType       m_OutputMaximum;
00177 
00178 };
00179 
00180 
00181   
00182 } // end namespace itk
00183   
00184 #ifndef ITK_MANUAL_INSTANTIATION
00185 #include "itkRescaleIntensityImageFilter.txx"
00186 #endif
00187   
00188 #endif
00189 

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