itkLogImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkLogImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2002/01/15 19:36:07 $
  Version:   $Revision: 1.14 $

  Copyright (c) 2002 Insight 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 __itkLogImageFilter_h
#define __itkLogImageFilter_h

#include "itkUnaryFunctorImageFilter.h"
#include "vnl/vnl_math.h"

namespace itk
{
  
namespace Function {  
  
  template< class TInput, class TOutput>
  class Log
  {
  public:
    Log() {}
    ~Log() {}
    inline TOutput operator()( const TInput & A )
    {
      return (TOutput)log((double)A);
    }
  }; 
}
template <class TInputImage, class TOutputImage>
class ITK_EXPORT LogImageFilter :
    public
    UnaryFunctorImageFilter<TInputImage,TOutputImage, 
    Function::Log< typename TInputImage::PixelType, 
                   typename TOutputImage::PixelType>   >
{
public:
  typedef LogImageFilter  Self;
  typedef UnaryFunctorImageFilter<TInputImage,TOutputImage, 
    Function::Log< typename TInputImage::PixelType, 
                   typename TOutputImage::PixelType> > Superclass;
  typedef SmartPointer<Self>   Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);
  
protected:
  LogImageFilter() {}
  virtual ~LogImageFilter() {}

private:
  LogImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};

} // end namespace itk


#endif

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