perform sinc interpolation on images More...

#include <vtkImageSincInterpolator.h>

Inheritance diagram for vtkImageSincInterpolator:

Collaboration diagram for vtkImageSincInterpolator:

Public Types
typedef vtkAbstractImageInterpolator	Superclass

Public Types inherited from vtkAbstractImageInterpolator
typedef vtkObject	Superclass

Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

Public Member Functions
virtual int	IsA (const char *type)

vtkImageSincInterpolator *	NewInstance () const

virtual void	PrintSelf (ostream &os, vtkIndent indent)

virtual void	ComputeSupportSize (const double matrix[16], int support[3])

virtual bool	IsSeparable ()

virtual void	FreePrecomputedWeights (vtkInterpolationWeights *&weights)


virtual void	SetWindowFunction (int mode)

void	SetWindowFunctionToLanczos ()

void	SetWindowFunctionToKaiser ()

void	SetWindowFunctionToCosine ()

void	SetWindowFunctionToHann ()

void	SetWindowFunctionToHamming ()

void	SetWindowFunctionToBlackman ()

void	SetWindowFunctionToBlackmanHarris3 ()

void	SetWindowFunctionToBlackmanHarris4 ()

void	SetWindowFunctionToNuttall ()

void	SetWindowFunctionToBlackmanNuttall3 ()

void	SetWindowFunctionToBlackmanNuttall4 ()

int	GetWindowFunction ()

virtual const char *	GetWindowFunctionAsString ()


void	SetWindowHalfWidth (int n)

int	GetWindowHalfWidth ()


void	SetUseWindowParameter (int val)

void	UseWindowParameterOn ()

void	UseWindowParameterOff ()

int	GetUseWindowParameter ()


void	SetWindowParameter (double parm)

double	GetWindowParameter ()


void	SetBlurFactors (double x, double y, double z)

void	SetBlurFactors (const double f[3])

void	GetBlurFactors (double f[3])

double *	GetBlurFactors ()


void	SetAntialiasing (int antialiasing)

void	AntialiasingOn ()

void	AntialiasingOff ()

int	GetAntialiasing ()


void	SetRenormalization (int renormalization)

void	RenormalizationOn ()

void	RenormalizationOff ()

int	GetRenormalization ()


virtual void	PrecomputeWeightsForExtent (const double matrix[16], const int extent[6], int newExtent[6], vtkInterpolationWeights *&weights)

virtual void	PrecomputeWeightsForExtent (const float matrix[16], const int extent[6], int newExtent[6], vtkInterpolationWeights *&weights)

Public Member Functions inherited from vtkAbstractImageInterpolator
vtkAbstractImageInterpolator *	NewInstance () const

virtual void	Initialize (vtkDataObject *data)

virtual void	ReleaseData ()

void	DeepCopy (vtkAbstractImageInterpolator *obj)

void	Update ()

double	Interpolate (double x, double y, double z, int component)

bool	Interpolate (const double point[3], double *value)

int	ComputeNumberOfComponents (int inputComponents)

int	GetNumberOfComponents ()

void	SetOutValue (double outValue)

double	GetOutValue ()

void	SetTolerance (double tol)

double	GetTolerance ()

void	SetComponentOffset (int offset)

int	GetComponentOffset ()

void	SetComponentCount (int count)

int	GetComponentCount ()

void	InterpolateIJK (const double point[3], double *value)

void	InterpolateIJK (const float point[3], float *value)

bool	CheckBoundsIJK (const double x[3])

bool	CheckBoundsIJK (const float x[3])

void	SetBorderMode (int mode)

void	SetBorderModeToClamp ()

void	SetBorderModeToRepeat ()

void	SetBorderModeToMirror ()

int	GetBorderMode ()

const char *	GetBorderModeAsString ()

void	InterpolateRow (vtkInterpolationWeights &weights, int xIdx, int yIdx, int zIdx, double value, int n)

void	InterpolateRow (vtkInterpolationWeights &weights, int xIdx, int yIdx, int zIdx, float value, int n)

virtual double *	GetSpacing ()

virtual void	GetSpacing (double &, double &, double &)

virtual void	GetSpacing (double[3])

virtual double *	GetOrigin ()

virtual void	GetOrigin (double &, double &, double &)

virtual void	GetOrigin (double[3])

virtual int *	GetExtent ()

virtual void	GetExtent (int &, int &, int &, int &, int &, int &)

virtual void	GetExtent (int[6])

virtual int *	GetWholeExtent ()

virtual void	GetWholeExtent (int &, int &, int &, int &, int &, int &)

virtual void	GetWholeExtent (int[6])

Public Member Functions inherited from vtkObject
vtkObject *	NewInstance () const

virtual void	DebugOn ()

virtual void	DebugOff ()

bool	GetDebug ()

void	SetDebug (bool debugFlag)

virtual void	Modified ()

virtual unsigned long	GetMTime ()

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)

vtkCommand *	GetCommand (unsigned long tag)

void	RemoveObserver (vtkCommand *)

void	RemoveObservers (unsigned long event, vtkCommand *)

void	RemoveObservers (const char event, vtkCommand )

int	HasObserver (unsigned long event, vtkCommand *)

int	HasObserver (const char event, vtkCommand )

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

int	HasObserver (unsigned long event)

int	HasObserver (const char *event)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

int	InvokeEvent (unsigned long event, void *callData)

int	InvokeEvent (const char event, void callData)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const

virtual void	Delete ()

virtual void	FastDelete ()

void	Print (ostream &os)

virtual void	Register (vtkObjectBase *o)

virtual void	UnRegister (vtkObjectBase *o)

void	SetReferenceCount (int)

void	PrintRevisions (ostream &)

virtual void	PrintHeader (ostream &os, vtkIndent indent)

virtual void	PrintTrailer (ostream &os, vtkIndent indent)

int	GetReferenceCount ()

Static Public Member Functions
static vtkImageSincInterpolator *	New ()

static int	IsTypeOf (const char *type)

static vtkImageSincInterpolator *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkAbstractImageInterpolator
static int	IsTypeOf (const char *type)

static vtkAbstractImageInterpolator *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkObject
static int	IsTypeOf (const char *type)

static vtkObject *	SafeDownCast (vtkObjectBase *o)

static vtkObject *	New ()

static void	BreakOnError ()

static void	SetGlobalWarningDisplay (int val)

static void	GlobalWarningDisplayOn ()

static void	GlobalWarningDisplayOff ()

static int	GetGlobalWarningDisplay ()

Static Public Member Functions inherited from vtkObjectBase
static int	IsTypeOf (const char *name)

static vtkObjectBase *	New ()

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkImageSincInterpolator ()

	~vtkImageSincInterpolator ()

virtual void	InternalUpdate ()

virtual void	InternalDeepCopy (vtkAbstractImageInterpolator *obj)

virtual void	BuildKernelLookupTable ()

virtual void	FreeKernelLookupTable ()


virtual void	GetInterpolationFunc (void(*doublefunc)(vtkInterpolationInfo , const double[3], double *))

virtual void	GetInterpolationFunc (void(*floatfunc)(vtkInterpolationInfo , const float[3], float *))


virtual void	GetRowInterpolationFunc (void(*doublefunc)(vtkInterpolationWeights , int, int, int, double *, int))

virtual void	GetRowInterpolationFunc (void(*floatfunc)(vtkInterpolationWeights , int, int, int, float *, int))

Protected Member Functions inherited from vtkAbstractImageInterpolator
	vtkAbstractImageInterpolator ()

	~vtkAbstractImageInterpolator ()

Protected Member Functions inherited from vtkObject
	vtkObject ()

virtual	~vtkObject ()

virtual void	RegisterInternal (vtkObjectBase *, int check)

virtual void	UnRegisterInternal (vtkObjectBase *, int check)

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=NULL)

void	InternalReleaseFocus ()

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

virtual void	ReportReferences (vtkGarbageCollector *)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
int	WindowFunction

int	WindowHalfWidth

float *	KernelLookupTable [3]

int	KernelSize [3]

int	Antialiasing

int	Renormalization

double	BlurFactors [3]

double	LastBlurFactors [3]

double	WindowParameter

int	UseWindowParameter

Protected Attributes inherited from vtkAbstractImageInterpolator
vtkDataArray *	Scalars

double	StructuredBoundsDouble [6]

float	StructuredBoundsFloat [6]

int	WholeExtent [6]

int	Extent [6]

double	Spacing [3]

double	Origin [3]

double	OutValue

double	Tolerance

int	BorderMode

int	ComponentOffset

int	ComponentCount

vtkInterpolationInfo *	InterpolationInfo

void(*	InterpolationFuncDouble )(vtkInterpolationInfo info, const double point[3], double outPtr)

void(*	InterpolationFuncFloat )(vtkInterpolationInfo info, const float point[3], float outPtr)

void(*	RowInterpolationFuncDouble )(vtkInterpolationWeights weights, int idX, int idY, int idZ, double outPtr, int n)

void(*	RowInterpolationFuncFloat )(vtkInterpolationWeights weights, int idX, int idY, int idZ, float outPtr, int n)

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Detailed Description

perform sinc interpolation on images

vtkImageSincInterpolator provides various windowed sinc interpolation methods for image data. The default is a five-lobed Lanczos interpolant, with a kernel size of 6. The interpolator can also bandlimit the image, which can be used for antialiasing. The interpolation kernels are evaluated via a lookup table for efficiency.

Thanks:: Thanks to David Gobbi at the Seaman Family MR Centre and Dept. of Clinical Neurosciences, Foothills Medical Centre, Calgary, for providing this class.

See also: vtkImageReslice

Tests:: vtkImageSincInterpolator (Tests)

Definition at line 55 of file vtkImageSincInterpolator.h.

Member Typedef Documentation

typedef vtkAbstractImageInterpolator vtkImageSincInterpolator::Superclass

Definition at line 60 of file vtkImageSincInterpolator.h.

Constructor & Destructor Documentation

vtkImageSincInterpolator::vtkImageSincInterpolator ( )

protected

vtkImageSincInterpolator::~vtkImageSincInterpolator ( )

protected

Member Function Documentation

static vtkImageSincInterpolator* vtkImageSincInterpolator::New ( )

static

static int vtkImageSincInterpolator::IsTypeOf ( const char * type )

static

virtual int vtkImageSincInterpolator::IsA ( const char * name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkAbstractImageInterpolator.

static vtkImageSincInterpolator* vtkImageSincInterpolator::SafeDownCast ( vtkObjectBase * o )

static

virtual vtkObjectBase* vtkImageSincInterpolator::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkAbstractImageInterpolator.

vtkImageSincInterpolator* vtkImageSincInterpolator::NewInstance ( ) const

virtual void vtkImageSincInterpolator::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)

virtual

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 vtkAbstractImageInterpolator.

virtual void vtkImageSincInterpolator::SetWindowFunction ( int mode )

virtual

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

void vtkImageSincInterpolator::SetWindowFunctionToLanczos ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 71 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToKaiser ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 73 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToCosine ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 75 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToHann ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 77 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToHamming ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 79 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToBlackman ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 81 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToBlackmanHarris3 ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 83 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToBlackmanHarris4 ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 85 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToNuttall ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 87 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToBlackmanNuttall3 ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 89 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowFunctionToBlackmanNuttall4 ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 91 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetWindowFunction ( )

inline

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

Definition at line 93 of file vtkImageSincInterpolator.h.

virtual const char* vtkImageSincInterpolator::GetWindowFunctionAsString ( )

virtual

The window function to use. The default is Lanczos, which is very popular and performs well with a kernel width of 6. The Cosine window is included for historical reasons. All other windows are described in AH Nuttall, "Some windows with very good sidelobe behavior," IEEE Transactions on Acoustics, Speech, and Signal Processing 29:84-91, 1981.

void vtkImageSincInterpolator::SetWindowHalfWidth ( int n )

Set the window half-width, this must be an integer between 1 and 16, with a default value of 3. The kernel size will be twice this value if no blur factors are applied. The total number of sinc lobes will be one less than twice the half-width, so if the half-width is 3 then the kernel size will be 6 and there will be 5 sinc lobes.

int vtkImageSincInterpolator::GetWindowHalfWidth ( )

inline

Set the window half-width, this must be an integer between 1 and 16, with a default value of 3. The kernel size will be twice this value if no blur factors are applied. The total number of sinc lobes will be one less than twice the half-width, so if the half-width is 3 then the kernel size will be 6 and there will be 5 sinc lobes.

Definition at line 104 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetUseWindowParameter ( int val )

Turn this on in order to use SetWindowParameter. If it is off, then the default parameter will be used for the window.

void vtkImageSincInterpolator::UseWindowParameterOn ( )

inline

Turn this on in order to use SetWindowParameter. If it is off, then the default parameter will be used for the window.

Definition at line 111 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::UseWindowParameterOff ( )

inline

Turn this on in order to use SetWindowParameter. If it is off, then the default parameter will be used for the window.

Definition at line 112 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetUseWindowParameter ( )

inline

Turn this on in order to use SetWindowParameter. If it is off, then the default parameter will be used for the window.

Definition at line 113 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetWindowParameter ( double parm )

Set the alpha parameter for the Kaiser window function. This parameter will be ignored unless UseWindowParameter is On. If UseWindowParameter is Off, then alpha is set to be the same as n where n is the window half-width. Using an alpha less than n increases the sharpness and ringing, while using an alpha greater than n increases the blurring.

double vtkImageSincInterpolator::GetWindowParameter ( )

inline

Set the alpha parameter for the Kaiser window function. This parameter will be ignored unless UseWindowParameter is On. If UseWindowParameter is Off, then alpha is set to be the same as n where n is the window half-width. Using an alpha less than n increases the sharpness and ringing, while using an alpha greater than n increases the blurring.

Definition at line 124 of file vtkImageSincInterpolator.h.

virtual void vtkImageSincInterpolator::ComputeSupportSize	(	const double	matrix[16],
		int	support[3]
	)

virtual

Get the support size for use in computing update extents. If the data will be sampled on a regular grid, then pass a matrix describing the structured coordinate transformation between the output and the input. Otherwise, pass NULL as the matrix to retrieve the full kernel size.

Implements vtkAbstractImageInterpolator.

void vtkImageSincInterpolator::SetBlurFactors	(	double	x,
		double	y,
		double	z
	)

Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. This reduces the bandwidth by these same factors. If you turn Antialiasing on, then the blur factors will be computed automatically from the output sampling rate. Blurring increases the computation time because the kernel size increases by the blur factor.

void vtkImageSincInterpolator::SetBlurFactors ( const double f[3] )

inline

Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. This reduces the bandwidth by these same factors. If you turn Antialiasing on, then the blur factors will be computed automatically from the output sampling rate. Blurring increases the computation time because the kernel size increases by the blur factor.

Definition at line 142 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::GetBlurFactors ( double f[3] )

inline

Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. This reduces the bandwidth by these same factors. If you turn Antialiasing on, then the blur factors will be computed automatically from the output sampling rate. Blurring increases the computation time because the kernel size increases by the blur factor.

Definition at line 144 of file vtkImageSincInterpolator.h.

double* vtkImageSincInterpolator::GetBlurFactors ( )

inline

Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. This reduces the bandwidth by these same factors. If you turn Antialiasing on, then the blur factors will be computed automatically from the output sampling rate. Blurring increases the computation time because the kernel size increases by the blur factor.

Definition at line 148 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetAntialiasing ( int antialiasing )

Turn on antialiasing. If antialiasing is on, then the BlurFactors will be computed automatically from the output sampling rate such that that the image will be bandlimited to the Nyquist frequency. This is only applicable when the interpolator is being used by a resampling filter like vtkImageReslice. Such a filter will indicate the output sampling by calling the interpolator's ComputeSupportSize() method, which will compute the blur factors at the same time that it computes the support size.

void vtkImageSincInterpolator::AntialiasingOn ( )

inline

Turn on antialiasing. If antialiasing is on, then the BlurFactors will be computed automatically from the output sampling rate such that that the image will be bandlimited to the Nyquist frequency. This is only applicable when the interpolator is being used by a resampling filter like vtkImageReslice. Such a filter will indicate the output sampling by calling the interpolator's ComputeSupportSize() method, which will compute the blur factors at the same time that it computes the support size.

Definition at line 161 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::AntialiasingOff ( )

inline

Turn on antialiasing. If antialiasing is on, then the BlurFactors will be computed automatically from the output sampling rate such that that the image will be bandlimited to the Nyquist frequency. This is only applicable when the interpolator is being used by a resampling filter like vtkImageReslice. Such a filter will indicate the output sampling by calling the interpolator's ComputeSupportSize() method, which will compute the blur factors at the same time that it computes the support size.

Definition at line 162 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetAntialiasing ( )

inline

Turn on antialiasing. If antialiasing is on, then the BlurFactors will be computed automatically from the output sampling rate such that that the image will be bandlimited to the Nyquist frequency. This is only applicable when the interpolator is being used by a resampling filter like vtkImageReslice. Such a filter will indicate the output sampling by calling the interpolator's ComputeSupportSize() method, which will compute the blur factors at the same time that it computes the support size.

Definition at line 163 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::SetRenormalization ( int renormalization )

Turn off renormalization. Most of the sinc windows provide kernels for which the weights do not sum to one, and for which the sum depends on the offset. This results in small ripple artifacts in the output. By default, the vtkImageSincInterpolator will renormalize these kernels. This method allows the renormalization to be turned off.

void vtkImageSincInterpolator::RenormalizationOn ( )

inline

Turn off renormalization. Most of the sinc windows provide kernels for which the weights do not sum to one, and for which the sum depends on the offset. This results in small ripple artifacts in the output. By default, the vtkImageSincInterpolator will renormalize these kernels. This method allows the renormalization to be turned off.

Definition at line 174 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::RenormalizationOff ( )

inline

Turn off renormalization. Most of the sinc windows provide kernels for which the weights do not sum to one, and for which the sum depends on the offset. This results in small ripple artifacts in the output. By default, the vtkImageSincInterpolator will renormalize these kernels. This method allows the renormalization to be turned off.

Definition at line 175 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetRenormalization ( )

inline

Turn off renormalization. Most of the sinc windows provide kernels for which the weights do not sum to one, and for which the sum depends on the offset. This results in small ripple artifacts in the output. By default, the vtkImageSincInterpolator will renormalize these kernels. This method allows the renormalization to be turned off.

Definition at line 176 of file vtkImageSincInterpolator.h.

virtual bool vtkImageSincInterpolator::IsSeparable ( )

virtual

Returns true if the interpolator supports weight precomputation. This will always return true for this interpolator.

Implements vtkAbstractImageInterpolator.

virtual void vtkImageSincInterpolator::PrecomputeWeightsForExtent	(	const double	matrix[16],
		const int	extent[6],
		int	newExtent[6],
		vtkInterpolationWeights *&	weights
	)

virtual

If the data is going to be sampled on a regular grid, then the interpolation weights can be precomputed. A matrix must be supplied that provides a transformation between the provided extent and the structured coordinates of the input. This matrix must perform only permutations, scales, and translation, i.e. each of the three columns must have only one non-zero value. A new extent is provided for out-of-bounds checks. THIS METHOD IS THREAD SAFE.

Reimplemented from vtkAbstractImageInterpolator.

virtual void vtkImageSincInterpolator::PrecomputeWeightsForExtent	(	const float	matrix[16],
		const int	extent[6],
		int	newExtent[6],
		vtkInterpolationWeights *&	weights
	)

virtual

If the data is going to be sampled on a regular grid, then the interpolation weights can be precomputed. A matrix must be supplied that provides a transformation between the provided extent and the structured coordinates of the input. This matrix must perform only permutations, scales, and translation, i.e. each of the three columns must have only one non-zero value. A new extent is provided for out-of-bounds checks. THIS METHOD IS THREAD SAFE.

Reimplemented from vtkAbstractImageInterpolator.

virtual void vtkImageSincInterpolator::FreePrecomputedWeights ( vtkInterpolationWeights *& weights )

virtual

Free the precomputed weights. THIS METHOD IS THREAD SAFE.

Reimplemented from vtkAbstractImageInterpolator.

virtual void vtkImageSincInterpolator::InternalUpdate ( )

protectedvirtual

Update the interpolator.

Implements vtkAbstractImageInterpolator.

virtual void vtkImageSincInterpolator::InternalDeepCopy ( vtkAbstractImageInterpolator * obj )

protectedvirtual

Copy the interpolator.