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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 itkMinMaxCurvatureFlowFunction_h
#define itkMinMaxCurvatureFlowFunction_h
#include "itkCurvatureFlowFunction.h"
#include "itkNeighborhoodOperator.h"
namespace itk
{
/** \class MinMaxCurvatureFlowFunction
*
* This class encapsulate the finite difference equation which drives a
* min/max curvature flow denoising algorithm.
*
* This class uses a zero flux Neumann boundary condition when computing
* derivatives near the data boundary.
*
* This class operates as part of the finite difference solver hierarchy.
*
* \sa MinMaxCurvatureFlowImageFilter
* \sa ZeroFluxNeumannBoundaryCondition
* \ingroup FiniteDifferenceFunctions
* \ingroup ITKCurvatureFlow
*/
template< typename TImage >
class ITK_TEMPLATE_EXPORT MinMaxCurvatureFlowFunction:
public CurvatureFlowFunction< TImage >
{
public:
/** Standard class typedefs. */
typedef MinMaxCurvatureFlowFunction Self;
typedef CurvatureFlowFunction< TImage > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods) */
itkTypeMacro(MinMaxCurvatureFlowFunction,
CurvatureFlowFunction);
/** Inherit some parameters from the superclass type. */
typedef typename Superclass::ImageType ImageType;
typedef typename Superclass::PixelType PixelType;
typedef typename Superclass::RadiusType RadiusType;
typedef typename Superclass::NeighborhoodType NeighborhoodType;
typedef typename Superclass::FloatOffsetType FloatOffsetType;
/** Extract superclass dimension. */
itkStaticConstMacro(ImageDimension, unsigned int,
Superclass::ImageDimension);
/** Typedef support for the stencil radius. */
typedef typename RadiusType::SizeValueType RadiusValueType;
/** Set/Get the stencil radius. */
void SetStencilRadius(const RadiusValueType radius);
const RadiusValueType & GetRadiusValueType() const
{ return m_StencilRadius; }
/** Convenience function for symmetry with SetStencilRadius. */
const RadiusValueType & GetStencilRadius() const
{ return GetRadiusValueType(); }
/** This method computes the solution update for each pixel that does not
* lie on a the data set boundary. */
virtual PixelType ComputeUpdate(const NeighborhoodType & neighborhood,
void *globalData,
const FloatOffsetType & offset = FloatOffsetType(0.0)
) ITK_OVERRIDE;
protected:
MinMaxCurvatureFlowFunction();
~MinMaxCurvatureFlowFunction() ITK_OVERRIDE {}
typedef Neighborhood< PixelType, itkGetStaticConstMacro(ImageDimension) > StencilOperatorType;
StencilOperatorType m_StencilOperator;
/** Initialize the stencil opearator to be an N-Dimensional sphere
* of radius m_StencilRadius. */
void InitializeStencilOperator();
private:
ITK_DISALLOW_COPY_AND_ASSIGN(MinMaxCurvatureFlowFunction);
RadiusValueType m_StencilRadius;
// To control overloaded versions of ComputeThreshold
struct DispatchBase {};
template< signed int VDimension >
struct Dispatch: public DispatchBase {};
/** This method computes the threshold by averaging the intensity
* in direction perpendicular to the image gradient. */
PixelType ComputeThreshold(const Dispatch< 2 > &,
const NeighborhoodType & neighborhood) const;
PixelType ComputeThreshold(const Dispatch< 3 > &,
const NeighborhoodType & neighborhood) const;
PixelType ComputeThreshold(const DispatchBase &,
const NeighborhoodType & neighborhood) const;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMinMaxCurvatureFlowFunction.hxx"
#endif
#endif
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