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itkVectorConnectedComponentImageFilter.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkVectorConnectedComponentImageFilter.h,v $
00005   Language:  C++
00006   Date:      $Date: 2006/04/03 15:07:52 $
00007   Version:   $Revision: 1.6 $
00008 
00009      This software is distributed WITHOUT ANY WARRANTY; without even 
00010      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00011      PURPOSE.  See the above copyright notices for more information.
00012 
00013 =========================================================================*/
00014 #ifndef __itkVectorConnectedComponentImageFilter_h
00015 #define __itkVectorConnectedComponentImageFilter_h
00016 
00017 #include "vnl/vnl_math.h"
00018 #include "itkNumericTraits.h"
00019 #include "itkConnectedComponentFunctorImageFilter.h"
00020 
00021 namespace itk
00022 {
00023   
00033 namespace Functor {  
00034   
00035 template<class TInput>
00036 class SimilarVectorsFunctor
00037 {
00038 public:
00039   SimilarVectorsFunctor()
00040     {threshold = itk::NumericTraits<ITK_TYPENAME TInput::ValueType>::Zero;};
00041 
00042   ~SimilarVectorsFunctor() {};
00043 
00044   void SetDistanceThreshold(const typename TInput::ValueType &thresh)
00045     {threshold = thresh;};
00046   typename TInput::ValueType GetDistanceThreshold() {return (threshold);};
00047   
00048   bool operator!=( const SimilarVectorsFunctor & ) const
00049   {
00050     return false;
00051   }
00052   bool operator==( const SimilarVectorsFunctor & other ) const
00053   {
00054     return !(*this != other);
00055   }
00056   bool operator()(const TInput &a, const TInput &b)
00057     {
00058     typename TInput::ValueType dotProduct = vnl_math_abs(a * b);
00059     return (1.0 - dotProduct <= threshold);
00060     };
00061 
00062 protected:
00063   typename TInput::ValueType threshold;
00064                             
00065 };
00066 
00067 } // end namespace Functor 
00068 
00069 template <class TInputImage, class TOutputImage, class TMaskImage=TInputImage>
00070 class ITK_EXPORT VectorConnectedComponentImageFilter :
00071     public ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage,
00072              Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
00073                                            TMaskImage> 
00074 {
00075 public:
00077   typedef VectorConnectedComponentImageFilter Self;
00078   typedef ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage, 
00079              Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
00080              TMaskImage> Superclass;
00081   typedef SmartPointer<Self>   Pointer;
00082   typedef SmartPointer<const Self>  ConstPointer;
00083 
00085   itkNewMacro(Self);
00086 
00088   itkTypeMacro(VectorConnectedComponentImageFilter,ConnectedComponentFunctorImageFilter);
00089 
00090   typedef typename TInputImage::PixelType::ValueType  InputValueType;
00091   
00092   virtual void SetDistanceThreshold(const InputValueType& thresh)
00093     {this->GetFunctor().SetDistanceThreshold(thresh);}
00094 
00095   virtual InputValueType GetDistanceThreshold()
00096     {return (this->GetFunctor().GetDistanceThreshold());}
00097 
00098 #ifdef ITK_USE_CONCEPT_CHECKING
00099 
00100   itkConceptMacro(InputHasNumericTraitsCheck,
00101                   (Concept::HasNumericTraits<InputValueType>));
00102 
00104 #endif
00105 
00106 protected:
00107   VectorConnectedComponentImageFilter() {};
00108   virtual ~VectorConnectedComponentImageFilter() {};
00109 
00110 private:
00111   VectorConnectedComponentImageFilter(const Self&); //purposely not implemented
00112   void operator=(const Self&); //purposely not implemented
00113 
00114 };
00115 
00116 } // end namespace itk
00117 
00118 #endif
00119 

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