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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkNormalVectorFunctionBase.h,v $
Language: C++
Date: $Date: 2003-09-10 14:28:53 $
Version: $Revision: 1.5 $
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 __itkNormalVectorFunctionBase_h_
#define __itkNormalVectorFunctionBase_h_
#include "itkFiniteDifferenceSparseImageFunction.h"
namespace itk {
/*
* \class NormalVectorFunctionBase
*
* \brief This class defines the common functionality for Sparse Image
* neighborhoods of unit vectors.
*
* \par
* This class is derived from the FiniteDifferenceSparseImageFunction class and
* adds the functionality needed to process unit normal vector
* neighborhoods.
*
* \par
* This class is the parent class of the NormalVectorDiffusionFunction
* class which defines all the necessary functionality for performing diffusion
* operations on unit vectors stored in sparse images. Other (non-diffusion)
* filters (such as median filtering) on unit vectors can also be derived from
* this base class.
*
* \par PARAMETERS
* This function class has a time step parameter which is returned by the
* ComputeGloablTimeStep method. Unlike other finite difference function
* classes, this class does not use the maximum change magnitude to compute the
* time step, it returns this predetermined time step.
*/
template <class TSparseImageType>
class ITK_EXPORT NormalVectorFunctionBase
:public FiniteDifferenceSparseImageFunction<TSparseImageType>
{
public:
/** Standard class typedef. */
typedef NormalVectorFunctionBase Self;
typedef FiniteDifferenceSparseImageFunction<TSparseImageType> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods) */
itkTypeMacro( NormalVectorFunctionBase, FiniteDifferenceSparseImageFunction );
/** Image dimension derived from the superclass. */
itkStaticConstMacro(ImageDimension, unsigned int, Superclass::ImageDimension);
/** Typedefs from the superclass. */
typedef typename Superclass::TimeStepType TimeStepType;
typedef typename Superclass::RadiusType RadiusType;
typedef typename Superclass::NeighborhoodType NeighborhoodType;
typedef typename Superclass::FloatOffsetType FloatOffsetType;
typedef typename Superclass::IndexType IndexType;
typedef typename Superclass::SparseImageType SparseImageType;
/** The node type for the sparse image. */
typedef typename SparseImageType::NodeType NodeType;
/** The basic floating point type for the variables. */
typedef typename NodeType::NodeValueType NodeValueType;
/** The vector type for the normals. */
typedef typename NodeType::NodeDataType NormalVectorType;
/** Globaldata methods are not needed in this class. */
virtual void *GetGlobalDataPointer() const {return 0;}
virtual void ReleaseGlobalDataPointer( void* ) const {};
/** For the global time step, we return the time step parameter. */
virtual TimeStepType ComputeGlobalTimeStep( void* ) const
{ return m_TimeStep; }
/** Sets the time step. */
void SetTimeStep( const TimeStepType &ts )
{ m_TimeStep = ts; }
/** Returns the time step. */
TimeStepType GetTimeStep() const
{ return m_TimeStep; }
protected:
NormalVectorFunctionBase();
~NormalVectorFunctionBase() {}
virtual void PrintSelf(std::ostream& os, Indent indent) const;
private:
/** The time step for normal vector finite difference computations. */
TimeStepType m_TimeStep;
NormalVectorFunctionBase(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkNormalVectorFunctionBase.txx"
#endif
#endif
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