ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkLogImageFilter.h
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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 __itkLogImageFilter_h
00019 #define __itkLogImageFilter_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 Log
00035 {
00036 public:
00037   Log() {}
00038   ~Log() {}
00039   bool operator!=(const Log &) const
00040   {
00041     return false;
00042   }
00044 
00045   bool operator==(const Log & other) const
00046   {
00047     return !( *this != other );
00048   }
00049 
00050   inline TOutput operator()(const TInput & A) const
00051   {
00052     return static_cast< TOutput >( vcl_log( static_cast< double >( A ) ) );
00053   }
00054 };
00055 }
00063 template< class TInputImage, class TOutputImage >
00064 class ITK_EXPORT LogImageFilter:
00065   public
00066   UnaryFunctorImageFilter< TInputImage, TOutputImage,
00067                            Functor::Log< typename TInputImage::PixelType,
00068                                          typename TOutputImage::PixelType >   >
00069 {
00070 public:
00072   typedef LogImageFilter Self;
00073   typedef UnaryFunctorImageFilter<
00074     TInputImage, TOutputImage,
00075     Functor::Log< typename TInputImage::PixelType,
00076                   typename TOutputImage::PixelType > > Superclass;
00077 
00078   typedef SmartPointer< Self >       Pointer;
00079   typedef SmartPointer< const Self > ConstPointer;
00080 
00082   itkNewMacro(Self);
00083 
00085   itkTypeMacro(LogImageFilter,
00086                UnaryFunctorImageFilter);
00087 
00088 #ifdef ITK_USE_CONCEPT_CHECKING
00089 
00090   itkConceptMacro( InputConvertibleToDoubleCheck,
00091                    ( Concept::Convertible< typename TInputImage::PixelType, double > ) );
00092   itkConceptMacro( DoubleConvertibleToOutputCheck,
00093                    ( Concept::Convertible< double, typename TOutputImage::PixelType > ) );
00094 
00096 #endif
00097 protected:
00098   LogImageFilter() {}
00099   virtual ~LogImageFilter() {}
00100 private:
00101   LogImageFilter(const Self &); //purposely not implemented
00102   void operator=(const Self &); //purposely not implemented
00103 };
00104 } // end namespace itk
00106 
00107 #endif
00108