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itkCannyEdgeDetectionImageFilter.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkCannyEdgeDetectionImageFilter.h,v $
00005   Language:  C++
00006   Date:      $Date: 2009-04-25 12:27:15 $
00007   Version:   $Revision: 1.28 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __itkCannyEdgeDetectionImageFilter_h
00018 #define __itkCannyEdgeDetectionImageFilter_h
00019 
00020 #include "itkImageToImageFilter.h"
00021 #include "itkImage.h"
00022 #include "itkFixedArray.h"
00023 #include "itkConstNeighborhoodIterator.h"
00024 #include "itkDiscreteGaussianImageFilter.h"
00025 #include "itkMultiplyImageFilter.h"
00026 #include "itkZeroFluxNeumannBoundaryCondition.h"
00027 #include "itkMultiThreader.h"
00028 #include "itkDerivativeOperator.h"
00029 #include "itkSparseFieldLayer.h"
00030 #include "itkObjectStore.h"
00031 
00032 
00033 namespace itk
00034 {
00035 
00036 
00037 template <class TValueType>
00038 class ListNode
00039 {
00040 public:
00041   TValueType m_Value;
00042 
00043   ListNode   *Next;
00044   ListNode   *Previous;
00045 };
00046 
00047 
00089 template<class TInputImage, class TOutputImage>
00090 class ITK_EXPORT CannyEdgeDetectionImageFilter
00091   : public ImageToImageFilter<TInputImage, TOutputImage>
00092 {
00093 public:
00095   typedef CannyEdgeDetectionImageFilter                 Self;
00096   typedef ImageToImageFilter<TInputImage, TOutputImage> Superclass;
00097 
00099   typedef TInputImage  InputImageType;
00100   typedef TOutputImage OutputImageType;
00101 
00103   typedef SmartPointer<Self>        Pointer;
00104   typedef SmartPointer<const Self>  ConstPointer;
00105 
00107   typedef typename TInputImage::PixelType   InputImagePixelType;
00108   typedef typename TOutputImage::PixelType  OutputImagePixelType;
00109   typedef typename TInputImage::IndexType   IndexType;
00110 
00113   typedef ZeroFluxNeumannBoundaryCondition<OutputImageType>
00114   DefaultBoundaryConditionType;
00115 
00119   typedef ConstNeighborhoodIterator<OutputImageType,
00120                                     DefaultBoundaryConditionType> NeighborhoodType;
00121 
00122   typedef ListNode<IndexType>            ListNodeType;
00123   typedef ObjectStore<ListNodeType>      ListNodeStorageType;
00124   typedef SparseFieldLayer<ListNodeType> ListType;
00125   typedef typename ListType::Pointer     ListPointerType;
00126 
00128   itkNewMacro(Self);  
00129 
00131   typedef typename TOutputImage::RegionType OutputImageRegionType;
00132   typedef typename TInputImage::RegionType  InputImageRegionType;
00133 
00135   itkTypeMacro(CannyEdgeDetectionImageFilter, ImageToImageFilter);
00136 
00138   itkStaticConstMacro(ImageDimension, unsigned int,
00139                       TInputImage::ImageDimension);
00140   itkStaticConstMacro(OutputImageDimension, unsigned int,
00141                       TOutputImage::ImageDimension);
00143 
00145   typedef FixedArray<double, itkGetStaticConstMacro(ImageDimension)> ArrayType;
00146 
00148   itkSetMacro(Variance, ArrayType);
00149   itkGetConstMacro(Variance, const ArrayType);
00150   itkSetMacro(MaximumError, ArrayType);
00151   itkGetConstMacro(MaximumError, const ArrayType);
00153 
00156   void SetVariance(const typename ArrayType::ValueType v)
00157     {
00158     for (unsigned int i=0; i < TInputImage::ImageDimension; i++)
00159       {
00160       if (m_Variance[i] != v)
00161         {
00162         m_Variance.Fill(v);
00163         this->Modified();
00164         break;
00165         }
00166       }
00167     }
00169 
00172   void SetMaximumError(const typename ArrayType::ValueType v)
00173     {
00174     for (unsigned int i=0; i < TInputImage::ImageDimension; i++)
00175       {
00176       if (m_MaximumError[i] != v)
00177         {
00178         m_MaximumError.Fill(v);
00179         this->Modified();
00180         break;
00181         }
00182       }
00183     }
00185 
00186   /* Set the Threshold value for detected edges. */
00187   void SetThreshold(const OutputImagePixelType th)
00188     {
00189     this->m_Threshold = th;
00190     this->m_UpperThreshold = m_Threshold;
00191     this->m_LowerThreshold = m_Threshold/2.0;
00192     itkLegacyReplaceBodyMacro(SetThreshold, 2.2, SetUpperThreshold);
00193     }
00194   
00195   OutputImagePixelType GetThreshold(OutputImagePixelType th) 
00196     {
00197     itkLegacyReplaceBodyMacro(GetThreshold, 2.2, GetUpperThreshold);
00198     return this->m_Threshold; 
00199     }
00200 
00202   itkSetMacro(UpperThreshold, OutputImagePixelType );
00203   itkGetConstMacro(UpperThreshold, OutputImagePixelType);
00204 
00205   itkSetMacro(LowerThreshold, OutputImagePixelType );
00206   itkGetConstMacro(LowerThreshold, OutputImagePixelType);
00207 
00208   /* Set the Thresholdvalue for detected edges. */
00209   itkSetMacro(OutsideValue, OutputImagePixelType);
00210   itkGetConstMacro(OutsideValue, OutputImagePixelType);
00211   
00212   OutputImageType * GetNonMaximumSuppressionImage()
00213     {
00214     return this->m_MultiplyImageFilter->GetOutput();
00215     }
00216 
00224   virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);
00225 
00226 #ifdef ITK_USE_CONCEPT_CHECKING
00227 
00228   itkConceptMacro(InputHasNumericTraitsCheck,
00229     (Concept::HasNumericTraits<InputImagePixelType>));
00230   itkConceptMacro(OutputHasNumericTraitsCheck,
00231     (Concept::HasNumericTraits<OutputImagePixelType>));
00232   itkConceptMacro(SameDimensionCheck,
00233     (Concept::SameDimension<ImageDimension, OutputImageDimension>));
00234   itkConceptMacro(InputIsFloatingPointCheck,
00235     (Concept::IsFloatingPoint<InputImagePixelType>));
00236   itkConceptMacro(OutputIsFloatingPointCheck,
00237     (Concept::IsFloatingPoint<OutputImagePixelType>));
00238 
00240 #endif
00241 
00242 protected:
00243   CannyEdgeDetectionImageFilter();
00244   CannyEdgeDetectionImageFilter(const Self&) {}
00245   void PrintSelf(std::ostream& os, Indent indent) const;
00246 
00247   void GenerateData();
00248 
00249   typedef DiscreteGaussianImageFilter<InputImageType, OutputImageType>
00250                                                       GaussianImageFilterType;
00251   typedef MultiplyImageFilter< OutputImageType, 
00252               OutputImageType, OutputImageType>       MultiplyImageFilterType;
00253 
00254 private:
00255   virtual ~CannyEdgeDetectionImageFilter(){};
00256 
00258   struct CannyThreadStruct
00259     {
00260     CannyEdgeDetectionImageFilter *Filter;
00261     };
00262 
00264   void AllocateUpdateBuffer();
00265 
00267   void HysteresisThresholding();
00268 
00270   void FollowEdge(IndexType index);
00271 
00272 
00276   void Compute2ndDerivative();
00277 
00286   //  virtual
00287   //  int SplitUpdateContainer(int i, int num, ThreadRegionType& splitRegion);
00288 
00294   void ThreadedCompute2ndDerivative(const OutputImageRegionType&
00295                                     outputRegionForThread, int threadId);
00296 
00300   static ITK_THREAD_RETURN_TYPE
00301   Compute2ndDerivativeThreaderCallback( void * arg );
00302 
00306   OutputImagePixelType ComputeCannyEdge(const NeighborhoodType &it,
00307                                         void *globalData );
00308 
00313   void Compute2ndDerivativePos();
00314 
00320   void ThreadedCompute2ndDerivativePos(const OutputImageRegionType&
00321                                        outputRegionForThread, int threadId);
00322 
00326   static ITK_THREAD_RETURN_TYPE
00327   Compute2ndDerivativePosThreaderCallback( void *arg );
00328 
00330   ArrayType m_Variance;
00331 
00334   ArrayType m_MaximumError;
00335 
00337   OutputImagePixelType m_UpperThreshold;  //should be float here?
00338 
00340   OutputImagePixelType m_LowerThreshold; //should be float here?
00341 
00343   OutputImagePixelType m_Threshold;
00344 
00346   OutputImagePixelType m_OutsideValue;
00347 
00349   typename OutputImageType::Pointer  m_UpdateBuffer1;
00350 
00352   typename GaussianImageFilterType::Pointer m_GaussianFilter;
00353 
00356   typename MultiplyImageFilterType::Pointer m_MultiplyImageFilter;
00357 
00360   DerivativeOperator<OutputImagePixelType,itkGetStaticConstMacro(ImageDimension)>
00361   m_ComputeCannyEdge1stDerivativeOper;
00362   DerivativeOperator<OutputImagePixelType,itkGetStaticConstMacro(ImageDimension)>
00363   m_ComputeCannyEdge2ndDerivativeOper;
00365 
00366   std::slice  m_ComputeCannyEdgeSlice[ImageDimension];
00367 
00368   unsigned long m_Stride[ImageDimension];
00369   unsigned long m_Center;
00370 
00371   typename ListNodeStorageType::Pointer m_NodeStore;
00372   ListPointerType                       m_NodeList;
00373 
00374 };
00375 
00376 } //end of namespace itk
00377 
00378 #ifndef ITK_MANUAL_INSTANTIATION
00379 #include "itkCannyEdgeDetectionImageFilter.txx"
00380 #endif
00381   
00382 #endif
00383 

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