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itkBSplineDerivativeKernelFunction.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkBSplineDerivativeKernelFunction.h,v $
00005   Language:  C++
00006   Date:      $Date: 2008-06-25 11:00:19 $
00007   Version:   $Revision: 1.7 $
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 __itkBSplineDerivativeKernelFunction_h
00018 #define __itkBSplineDerivativeKernelFunction_h
00019 
00020 #include "itkKernelFunction.h"
00021 #include "itkBSplineKernelFunction.h"
00022 
00023 namespace itk
00024 {
00025 
00041 template <unsigned int VSplineOrder = 3>
00042 class ITK_EXPORT BSplineDerivativeKernelFunction : public KernelFunction
00043 {
00044 public:
00046   typedef BSplineDerivativeKernelFunction Self;
00047   typedef KernelFunction                  Superclass;
00048   typedef SmartPointer<Self>              Pointer;
00049 
00051   itkNewMacro(Self); 
00052 
00054   itkTypeMacro(BSplineDerivativeKernelFunction, KernelFunction); 
00055 
00057   itkStaticConstMacro(SplineOrder, unsigned int, VSplineOrder);
00058 
00060   inline double Evaluate( const double & u ) const
00061     {
00062     return ( m_KernelFunction->Evaluate( u + 0.5 ) - 
00063       m_KernelFunction->Evaluate( u - 0.5 ) );
00064     }
00065 
00066 protected:
00067 
00068   typedef BSplineKernelFunction<itkGetStaticConstMacro(SplineOrder) - 1>
00069       KernelType;
00070 
00071   BSplineDerivativeKernelFunction()
00072     {
00073     m_KernelFunction = KernelType::New();
00074     }
00075 
00076   ~BSplineDerivativeKernelFunction(){};
00077   void PrintSelf(std::ostream& os, Indent indent) const
00078     { 
00079     Superclass::PrintSelf( os, indent ); 
00080     os << indent  << "Spline Order: " << SplineOrder << std::endl;
00081     }  
00082 
00083 private:
00084   BSplineDerivativeKernelFunction(const Self&); //purposely not implemented
00085   void operator=(const Self&); //purposely not implemented
00086 
00087   typename KernelType::Pointer  m_KernelFunction;
00088 
00089 };
00090 
00091 } // end namespace itk
00092 
00093 #endif
00094 

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