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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#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.
* \ingroup ITKLevelSets
*/
template< typename TSparseImageType >
class ITK_TEMPLATE_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 ITK_OVERRIDE { return ITK_NULLPTR; }
virtual void ReleaseGlobalDataPointer(void *) const ITK_OVERRIDE {}
/** For the global time step, we return the time step parameter. */
virtual TimeStepType ComputeGlobalTimeStep(void *) const ITK_OVERRIDE
{ 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() ITK_OVERRIDE {}
virtual void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
private:
/** The time step for normal vector finite difference computations. */
TimeStepType m_TimeStep;
ITK_DISALLOW_COPY_AND_ASSIGN(NormalVectorFunctionBase);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkNormalVectorFunctionBase.hxx"
#endif
#endif
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