itkMinimumImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkMinimumImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2009-04-01 14:36:30 $
  Version:   $Revision: 1.12 $

  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 __itkMinimumImageFilter_h
#define __itkMinimumImageFilter_h

#include "itkBinaryFunctorImageFilter.h"

namespace itk
{
  
namespace Function {  

template< class TInput1, class TInput2=TInput1, class TOutput=TInput1>
class Minimum
{
public:
  Minimum() {}
  ~Minimum() {}
  bool operator!=( const Minimum & ) const
    {
    return false;
    }
  bool operator==( const Minimum & other ) const
    {
    return !(*this != other);
    }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
    { return static_cast<TOutput>( (A < B)? A : B ); }
}; 
}

template <class TInputImage1, class TInputImage2=TInputImage1, class TOutputImage=TInputImage1>
class ITK_EXPORT MinimumImageFilter :
    public
BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
                         Function::Minimum< 
  typename TInputImage1::PixelType, 
  typename TInputImage2::PixelType,
  typename TOutputImage::PixelType>   >
{
public:
  typedef MinimumImageFilter        Self;
  typedef BinaryFunctorImageFilter<
    TInputImage1,TInputImage2,TOutputImage, 
    Function::Minimum< 
      typename TInputImage1::PixelType, 
      typename TInputImage2::PixelType,
      typename TOutputImage::PixelType>   
    >                               Superclass;
  typedef SmartPointer<Self>        Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(MinimumImageFilter, 
               BinaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(Input1ConvertibleToInput2Check,
    (Concept::Convertible<typename TInputImage1::PixelType,
                          typename TInputImage2::PixelType>));
  itkConceptMacro(Input2ConvertibleToOutputCheck,
    (Concept::Convertible<typename TInputImage2::PixelType,
                          typename TOutputImage::PixelType>));
  itkConceptMacro(Input1LessThanInput2Check,
    (Concept::LessThanComparable<typename TInputImage1::PixelType,
                                 typename TInputImage2::PixelType>));

#endif

protected:
  MinimumImageFilter() {}
  virtual ~MinimumImageFilter() {}

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

};

} // end namespace itk


#endif