ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkExpNegativeImageFilter.h
Go to the documentation of this file.
00001 /*=========================================================================
00002  *
00003  *  Copyright Insight Software Consortium
00004  *
00005  *  Licensed under the Apache License, Version 2.0 (the "License");
00006  *  you may not use this file except in compliance with the License.
00007  *  You may obtain a copy of the License at
00008  *
00009  *         http://www.apache.org/licenses/LICENSE-2.0.txt
00010  *
00011  *  Unless required by applicable law or agreed to in writing, software
00012  *  distributed under the License is distributed on an "AS IS" BASIS,
00013  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  *  See the License for the specific language governing permissions and
00015  *  limitations under the License.
00016  *
00017  *=========================================================================*/
00018 #ifndef __itkExpNegativeImageFilter_h
00019 #define __itkExpNegativeImageFilter_h
00020 
00021 #include "itkUnaryFunctorImageFilter.h"
00022 #include "vnl/vnl_math.h"
00023 
00024 namespace itk
00025 {
00026 namespace Functor
00027 {
00033 template< class TInput, class TOutput >
00034 class ExpNegative
00035 {
00036 public:
00037   ExpNegative() { m_Factor = 1.0; }
00038   ~ExpNegative() {}
00040 
00041   bool operator!=(const ExpNegative & other) const
00042   {
00043     if ( m_Factor != other.m_Factor )
00044       {
00045       return true;
00046       }
00047     return false;
00048   }
00049 
00050   bool operator==(const ExpNegative & other) const
00051   {
00052     return !( *this != other );
00053   }
00054 
00055   inline TOutput operator()(const TInput & A) const
00056   {
00057     return static_cast< TOutput >( vcl_exp( -m_Factor * static_cast< double >( A ) ) );
00058   }
00059 
00061   void SetFactor(double factor)
00062   {
00063     m_Factor = factor;
00064   }
00065 
00066   double GetFactor() const
00067   {
00068     return m_Factor;
00069   }
00070 
00071 private:
00072   double m_Factor;
00073 };
00074 }
00087 template< class TInputImage, class TOutputImage >
00088 class ITK_EXPORT ExpNegativeImageFilter:
00089   public
00090   UnaryFunctorImageFilter< TInputImage, TOutputImage,
00091                            Functor::ExpNegative<
00092                              typename TInputImage::PixelType,
00093                              typename TOutputImage::PixelType >   >
00094 {
00095 public:
00097   typedef ExpNegativeImageFilter Self;
00098   typedef UnaryFunctorImageFilter<
00099     TInputImage, TOutputImage,
00100     Functor::ExpNegative< typename TInputImage::PixelType,
00101                           typename TOutputImage::PixelType > >  Superclass;
00102 
00103   typedef SmartPointer< Self >       Pointer;
00104   typedef SmartPointer< const Self > ConstPointer;
00105 
00107   itkNewMacro(Self);
00108 
00110   itkTypeMacro(ExpNegativeImageFilter,
00111                UnaryFunctorImageFilter);
00112 
00113   void SetFactor(double factor)
00114   {
00115     if ( factor == this->GetFunctor().GetFactor() )
00116       {
00117       return;
00118       }
00119     this->GetFunctor().SetFactor(factor);
00120     this->Modified();
00121   }
00122 
00123 #ifdef ITK_USE_CONCEPT_CHECKING
00124 
00125   itkConceptMacro( InputConvertibleToDoubleCheck,
00126                    ( Concept::Convertible< typename TInputImage::PixelType, double > ) );
00127   itkConceptMacro( DoubleConvertibleToOutputCheck,
00128                    ( Concept::Convertible< double, typename TOutputImage::PixelType > ) );
00129 
00131 #endif
00132 protected:
00133   ExpNegativeImageFilter() {}
00134   virtual ~ExpNegativeImageFilter() {}
00135 private:
00136   ExpNegativeImageFilter(const Self &); //purposely not implemented
00137   void operator=(const Self &);         //purposely not implemented
00138 };
00139 } // end namespace itk
00141 
00142 #endif
00143