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itk::CurvatureNDAnisotropicDiffusionFunction< TImage > Class Template Reference
[Finite Difference FunctionsImage Enhancement Filters]

#include <itkCurvatureNDAnisotropicDiffusionFunction.h>

Inheritance diagram for itk::CurvatureNDAnisotropicDiffusionFunction< TImage >:

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Collaboration diagram for itk::CurvatureNDAnisotropicDiffusionFunction< TImage >:

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List of all members.

Public Types

typedef SmartPointer< const SelfConstPointer
typedef
ZeroFluxNeumannBoundaryCondition
< ImageType
DefaultBoundaryConditionType
typedef Superclass::FloatOffsetType FloatOffsetType
typedef Superclass::ImageType ImageType
typedef Vector< PixelRealType,
itkGetStaticConstMacro(ImageDimension)> 
NeighborhoodScalesType
typedef
Superclass::NeighborhoodType 
NeighborhoodType
typedef Superclass::PixelRealType PixelrealType
typedef Superclass::PixelRealType PixelRealType
typedef Superclass::PixelType PixelType
typedef SmartPointer< SelfPointer
typedef Superclass::RadiusType RadiusType
typedef
CurvatureNDAnisotropicDiffusionFunction 
Self
typedef
ScalarAnisotropicDiffusionFunction
< TImage > 
Superclass
typedef Superclass::TimeStepType TimeStepType

Public Member Functions

virtual void CalculateAverageGradientMagnitudeSquared (ImageType *)=0
virtual void CalculateAverageGradientMagnitudeSquared (TImage *)
virtual TimeStepType ComputeGlobalTimeStep (void *) const
const NeighborhoodScalesType ComputeNeighborhoodScales () const
virtual PixelType ComputeUpdate (const NeighborhoodType &neighborhood, void *globalData, const FloatOffsetType &offset=FloatOffsetType(0.0))
virtual Pointer CreateAnother () const
virtual void Delete ()
virtual void * GetGlobalDataPointer () const
virtual const char * GetNameOfClass () const
const RadiusTypeGetRadius () const
virtual int GetReferenceCount () const
virtual void InitializeIteration ()
 itkStaticConstMacro (ImageDimension, unsigned int, ImageType::ImageDimension)
 itkStaticConstMacro (ImageDimension, unsigned int, Superclass::ImageDimension)
void Print (std::ostream &os, Indent indent=0) const
virtual void Register () const
virtual void ReleaseGlobalDataPointer (void *) const
void SetRadius (const RadiusType &r)
virtual void SetReferenceCount (int)
virtual void UnRegister () const
const double & GetAverageGradientMagnitudeSquared () const
void SetAverageGradientMagnitudeSquared (const double &c)
const double & GetConductanceParameter () const
void SetConductanceParameter (const double &c)
const TimeStepTypeGetTimeStep () const
void SetTimeStep (const TimeStepType &t)
void SetScaleCoefficients (PixelRealType vals[ImageDimension])

Static Public Member Functions

static void BreakOnError ()
static Pointer New ()

Protected Types

typedef int InternalReferenceCountType

Protected Member Functions

 CurvatureNDAnisotropicDiffusionFunction ()
void PrintSelf (std::ostream &os, Indent indent) const
 ~CurvatureNDAnisotropicDiffusionFunction ()
virtual void PrintHeader (std::ostream &os, Indent indent) const
virtual void PrintTrailer (std::ostream &os, Indent indent) const

Protected Attributes

RadiusType m_Radius
InternalReferenceCountType m_ReferenceCount
SimpleFastMutexLock m_ReferenceCountLock
PixelRealType m_ScaleCoefficients [ImageDimension]


Detailed Description

template<class TImage>
class itk::CurvatureNDAnisotropicDiffusionFunction< TImage >

This class implements a variation on the classic, Perona-Malik anisotropic image diffusion equation as described in itkGradientNDAnisotropicDiffusionFunction. This object is a level-set analog of that equation and will be referred to below as the modified curvature diffusion equation (MCDE). MCDE does not exhibit the edge enhancing properties of classic anisotropic diffusion, which can under certain conditions undergo a ``negative'' diffusion,which enhances the contrast of edges. Equations of the form of MCDE always undergo positive diffusion, with the conductance term only varying the strength of that diffusion.

Qualitatively, MCDE compares well with other non-linear diffusion techniques. It is less sensitive to contrast than classic Perona-Malik style diffusion, and preserves finer detailed structures in images. There is a potential speed trade-off for using this function in place of itkGradientNDAnisotropicDiffusionFunction. Each iteration of the solution takes roughly twice as long. Fewer iterations, however, may be required to reach an acceptable solution.
The MCDE equation is given as:

\[ f_t = \mid \nabla f \mid \nabla \cdot c( \mid \nabla f \mid ) \frac{ \nabla f }{ \mid \nabla f \mid } \]

,

where the conductance modified curvature term is

\[ \nabla \cdot \frac{\nabla f}{\mid \nabla f \mid} \]

.

References
R. Whitaker and X. Xue. Variable-Conductance, Level-Set Curvature for Image Denoising, International Conference on Image Processing, 2001 pp. 142-145, Vol.3.
See also:
AnisotropicDiffusionFunction
Todo:
References

Definition at line 72 of file itkCurvatureNDAnisotropicDiffusionFunction.h.


Member Typedef Documentation

template<class TImage>
typedef SmartPointer<const Self> itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::ConstPointer

The default boundary condition for finite difference functions that is used unless overridden in the Evaluate() method.

Definition at line 92 of file itkFiniteDifferenceFunction.h.

A floating point offset from an image grid location. Used for interpolation among grid values in a neighborhood.

Reimplemented from itk::AnisotropicDiffusionFunction< TImage >.

Definition at line 96 of file itkCurvatureNDAnisotropicDiffusionFunction.h.

Inherit some parameters from the superclass type.

Reimplemented from itk::ScalarAnisotropicDiffusionFunction< TImage >.

Definition at line 88 of file itkCurvatureNDAnisotropicDiffusionFunction.h.

typedef int itk::LightObject::InternalReferenceCountType [protected, inherited]

Define the type of the reference count according to the target. This allows the use of atomic operations

Definition at line 139 of file itkLightObject.h.

typedef Vector<PixelRealType,itkGetStaticConstMacro(ImageDimension)> itk::FiniteDifferenceFunction< TImage >::NeighborhoodScalesType [inherited]

The type of data structure that holds the scales with which the neighborhood is weighted to properly account for spacing and neighborhood radius.

Reimplemented in itk::CurvatureFlowFunction< TImage >, and itk::CurvatureFlowFunction< TImage >.

Definition at line 103 of file itkFiniteDifferenceFunction.h.

The type of data structure that is passed to this function object to evaluate at a pixel that does not lie on a data set boundary.

Reimplemented from itk::ScalarAnisotropicDiffusionFunction< TImage >.

Definition at line 95 of file itkCurvatureNDAnisotropicDiffusionFunction.h.

Definition at line 152 of file itkAnisotropicDiffusionFunction.h.

template<class TImage>
typedef SmartPointer<Self> itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::Pointer

Standard class typedefs.

Reimplemented from itk::ScalarAnisotropicDiffusionFunction< TImage >.

Definition at line 78 of file itkCurvatureNDAnisotropicDiffusionFunction.h.

Define the TimeStepType to always be double.

Reimplemented from itk::ScalarAnisotropicDiffusionFunction< TImage >.

Definition at line 93 of file itkCurvatureNDAnisotropicDiffusionFunction.h.


Constructor & Destructor Documentation

template<class TImage>
itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::CurvatureNDAnisotropicDiffusionFunction (  )  [protected]

template<class TImage>
itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::~CurvatureNDAnisotropicDiffusionFunction (  )  [inline, protected]


Member Function Documentation

static void itk::LightObject::BreakOnError (  )  [static, inherited]

This method is called when itkExceptionMacro executes. It allows the debugger to break on error.

virtual void itk::AnisotropicDiffusionFunction< TImage >::CalculateAverageGradientMagnitudeSquared ( ImageType *   )  [pure virtual, inherited]

This method is called before each iteration. It calculates a scalar value that is the average of the gradient magnitude squared at each pixel in the output image (intermediate solution). The average gradient magnitude value is typically used in the anisotropic diffusion equations to calibrate the conductance term.

virtual void itk::ScalarAnisotropicDiffusionFunction< TImage >::CalculateAverageGradientMagnitudeSquared ( TImage *   )  [virtual, inherited]

virtual TimeStepType itk::AnisotropicDiffusionFunction< TImage >::ComputeGlobalTimeStep ( void *   )  const [inline, virtual, inherited]

Returns the time step supplied by the user. We don't need to use the global data supplied since we are returning a fixed value.

Implements itk::FiniteDifferenceFunction< TImage >.

Definition at line 205 of file itkAnisotropicDiffusionFunction.h.

const NeighborhoodScalesType itk::FiniteDifferenceFunction< TImage >::ComputeNeighborhoodScales (  )  const [inherited]

Compute the scales that weight the neighborhood during difference operations to properly account for spacing and neighborhood radius

template<class TImage>
virtual PixelType itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::ComputeUpdate ( const NeighborhoodType neighborhood,
void *  globalData,
const FloatOffsetType offset = FloatOffsetType(0.0) 
) [virtual]

Compute incremental update.

Implements itk::FiniteDifferenceFunction< TImage >.

virtual Pointer itk::LightObject::CreateAnother (  )  const [virtual, inherited]

Create an object from an instance, potentially deferring to a factory. This method allows you to create an instance of an object that is exactly the same type as the referring object. This is useful in cases where an object has been cast back to a base class.

Reimplemented in itk::Object.

virtual void itk::LightObject::Delete (  )  [virtual, inherited]

Delete an itk object. This method should always be used to delete an object when the new operator was used to create it. Using the C delete method will not work with reference counting.

const double& itk::AnisotropicDiffusionFunction< TImage >::GetAverageGradientMagnitudeSquared (  )  const [inline, inherited]

Set/Get the average gradient magnitude squared.

Definition at line 193 of file itkAnisotropicDiffusionFunction.h.

const double& itk::AnisotropicDiffusionFunction< TImage >::GetConductanceParameter (  )  const [inline, inherited]

Set/Get the conductance parameter. The conductance parameter.

Definition at line 186 of file itkAnisotropicDiffusionFunction.h.

virtual void* itk::AnisotropicDiffusionFunction< TImage >::GetGlobalDataPointer (  )  const [inline, virtual, inherited]

The anisotropic diffusion classes don't use this particular parameter so it's safe to return a null value.

Implements itk::FiniteDifferenceFunction< TImage >.

Definition at line 212 of file itkAnisotropicDiffusionFunction.h.

template<class TImage>
virtual const char* itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::GetNameOfClass (  )  const [virtual]

Run-time type information (and related methods)

Reimplemented from itk::ScalarAnisotropicDiffusionFunction< TImage >.

const RadiusType& itk::FiniteDifferenceFunction< TImage >::GetRadius ( void   )  const [inline, inherited]

Returns the radius of the neighborhood this FiniteDifferenceFunction needs to perform its calculations.

Definition at line 146 of file itkFiniteDifferenceFunction.h.

virtual int itk::LightObject::GetReferenceCount (  )  const [inline, virtual, inherited]

Gets the reference count on this object.

Definition at line 106 of file itkLightObject.h.

const TimeStepType& itk::AnisotropicDiffusionFunction< TImage >::GetTimeStep (  )  const [inline, inherited]

Set/Get the time step. For this class of anisotropic diffusion filters, the time-step is supplied by the user and remains fixed for all updates.

Definition at line 175 of file itkAnisotropicDiffusionFunction.h.

template<class TImage>
virtual void itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::InitializeIteration (  )  [inline, virtual]

This method is called prior to each iteration of the solver.

Reimplemented from itk::FiniteDifferenceFunction< TImage >.

Definition at line 108 of file itkCurvatureNDAnisotropicDiffusionFunction.h.

itk::FiniteDifferenceFunction< TImage >::itkStaticConstMacro ( ImageDimension  ,
unsigned  int,
ImageType::ImageDimension   
) [inherited]

Save image dimension.

template<class TImage>
itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::itkStaticConstMacro ( ImageDimension  ,
unsigned  int,
Superclass::ImageDimension   
)

Inherit some parameters from the superclass type.

Reimplemented from itk::ScalarAnisotropicDiffusionFunction< TImage >.

template<class TImage>
static Pointer itk::CurvatureNDAnisotropicDiffusionFunction< TImage >::New (  )  [static]

Method for creation through the object factory.

Reimplemented from itk::LightObject.

void itk::LightObject::Print ( std::ostream &  os,
Indent  indent = 0 
) const [inherited]

Cause the object to print itself out.

Referenced by itk::WeakPointer< ProcessObject >::Print().

virtual void itk::LightObject::PrintHeader ( std::ostream &  os,
Indent  indent 
) const [protected, virtual, inherited]

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

void itk::AnisotropicDiffusionFunction< TImage >::PrintSelf ( std::ostream &  os,
Indent  indent 
) const [inline, protected, virtual, inherited]

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from itk::FiniteDifferenceFunction< TImage >.

Reimplemented in itk::VectorAnisotropicDiffusionFunction< TImage >, itk::VectorCurvatureNDAnisotropicDiffusionFunction< TImage >, and itk::VectorAnisotropicDiffusionFunction< TImage >.

Definition at line 232 of file itkAnisotropicDiffusionFunction.h.

References HardConnectedComponentImageFilter::PrintSelf().

virtual void itk::LightObject::PrintTrailer ( std::ostream &  os,
Indent  indent 
) const [protected, virtual, inherited]

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

virtual void itk::LightObject::Register (  )  const [virtual, inherited]

Increase the reference count (mark as used by another object).

Reimplemented in itk::Object.

virtual void itk::AnisotropicDiffusionFunction< TImage >::ReleaseGlobalDataPointer ( void *   )  const [inline, virtual, inherited]

Does nothing. No global data is used in this class of equations.

Implements itk::FiniteDifferenceFunction< TImage >.

Definition at line 218 of file itkAnisotropicDiffusionFunction.h.

void itk::AnisotropicDiffusionFunction< TImage >::SetAverageGradientMagnitudeSquared ( const double &  c  )  [inline, inherited]

Set/Get the average gradient magnitude squared.

Definition at line 197 of file itkAnisotropicDiffusionFunction.h.

void itk::AnisotropicDiffusionFunction< TImage >::SetConductanceParameter ( const double &  c  )  [inline, inherited]

Set/Get the conductance parameter. The conductance parameter.

Definition at line 182 of file itkAnisotropicDiffusionFunction.h.

void itk::FiniteDifferenceFunction< TImage >::SetRadius ( const RadiusType &  r  )  [inline, inherited]

Sets the radius of the neighborhood this FiniteDifferenceFunction needs to perform its calculations.

Definition at line 141 of file itkFiniteDifferenceFunction.h.

virtual void itk::LightObject::SetReferenceCount ( int   )  [virtual, inherited]

Sets the reference count on this object. This is a dangerous method, use it with care.

Reimplemented in itk::Object.

void itk::FiniteDifferenceFunction< TImage >::SetScaleCoefficients ( PixelRealType  vals[ImageDimension]  )  [inline, inherited]

Set the ScaleCoefficients for the difference operators. The defaults a 1.0. These can be set to take the image spacing into account.

Definition at line 152 of file itkFiniteDifferenceFunction.h.

void itk::AnisotropicDiffusionFunction< TImage >::SetTimeStep ( const TimeStepType &  t  )  [inline, inherited]

Set/Get the time step. For this class of anisotropic diffusion filters, the time-step is supplied by the user and remains fixed for all updates.

Definition at line 171 of file itkAnisotropicDiffusionFunction.h.

virtual void itk::LightObject::UnRegister (  )  const [virtual, inherited]

Decrease the reference count (release by another object).

Reimplemented in itk::Object.


Member Data Documentation

RadiusType itk::FiniteDifferenceFunction< TImage >::m_Radius [protected, inherited]

Definition at line 203 of file itkFiniteDifferenceFunction.h.

Number of uses of this object by other objects.

Definition at line 144 of file itkLightObject.h.

Mutex lock to protect modification to the reference count

Definition at line 147 of file itkLightObject.h.

PixelRealType itk::FiniteDifferenceFunction< TImage >::m_ScaleCoefficients[ImageDimension] [protected, inherited]

Definition at line 204 of file itkFiniteDifferenceFunction.h.


The documentation for this class was generated from the following file:

Generated at Tue Sep 15 07:38:12 2009 for ITK by doxygen 1.5.8 written by Dimitri van Heesch, © 1997-2000