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 Member Functions
virtual vtkTypeBool	IsA (const char *type)
	Return 1 if this class is the same type of (or a subclass of) the named class. More...

vtkImageSincInterpolator *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses. More...

void	SetWindowHalfWidth (int n)
	Set the window half-width, this must be an integer between 1 and 16, with a default value of 3. More...

int	GetWindowHalfWidth ()

void	SetUseWindowParameter (int val)
	Turn this on in order to use SetWindowParameter. More...

void	UseWindowParameterOn ()

void	UseWindowParameterOff ()

int	GetUseWindowParameter ()

void	SetWindowParameter (double parm)
	Set the alpha parameter for the Kaiser window function. More...

double	GetWindowParameter ()

void	ComputeSupportSize (const double matrix[16], int support[3]) override
	Get the support size for use in computing update extents. More...

void	SetAntialiasing (int antialiasing)
	Turn on antialiasing. More...

void	AntialiasingOn ()

void	AntialiasingOff ()

int	GetAntialiasing ()

void	SetRenormalization (int renormalization)
	Turn off renormalization. More...

void	RenormalizationOn ()

void	RenormalizationOff ()

int	GetRenormalization ()

bool	IsSeparable () override
	Returns true if the interpolator supports weight precomputation. More...

void	FreePrecomputedWeights (vtkInterpolationWeights *&weights) override
	Free the precomputed weights. More...


virtual void	SetWindowFunction (int mode)
	The window function to use. More...

void	SetWindowFunctionToLanczos ()
	The window function to use. More...

void	SetWindowFunctionToKaiser ()
	The window function to use. More...

void	SetWindowFunctionToCosine ()
	The window function to use. More...

void	SetWindowFunctionToHann ()
	The window function to use. More...

void	SetWindowFunctionToHamming ()
	The window function to use. More...

void	SetWindowFunctionToBlackman ()
	The window function to use. More...

void	SetWindowFunctionToBlackmanHarris3 ()
	The window function to use. More...

void	SetWindowFunctionToBlackmanHarris4 ()
	The window function to use. More...

void	SetWindowFunctionToNuttall ()
	The window function to use. More...

void	SetWindowFunctionToBlackmanNuttall3 ()
	The window function to use. More...

void	SetWindowFunctionToBlackmanNuttall4 ()
	The window function to use. More...

int	GetWindowFunction ()
	The window function to use. More...

virtual const char *	GetWindowFunctionAsString ()
	The window function to use. More...


void	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. More...

void	SetBlurFactors (const double f[3])
	Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. More...

void	GetBlurFactors (double f[3])
	Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. More...

double *	GetBlurFactors ()
	Blur the image by widening the windowed sinc kernel by the specified factors for the x, y, and z directions. More...


void	PrecomputeWeightsForExtent (const double matrix[16], const int extent[6], int newExtent[6], vtkInterpolationWeights *&weights) override
	If the data is going to be sampled on a regular grid, then the interpolation weights can be precomputed. More...

void	PrecomputeWeightsForExtent (const float matrix[16], const int extent[6], int newExtent[6], vtkInterpolationWeights *&weights) override
	If the data is going to be sampled on a regular grid, then the interpolation weights can be precomputed. More...

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

virtual void	Initialize (vtkDataObject *data)
	Initialize the interpolator with the data that you wish to interpolate. More...

virtual void	ReleaseData ()
	Release any data stored by the interpolator. More...

void	DeepCopy (vtkAbstractImageInterpolator *obj)
	Copy the interpolator. More...

void	Update ()
	Update the interpolator. More...

double	Interpolate (double x, double y, double z, int component)
	Get the result of interpolating the specified component of the input data, which should be set to zero if there is only one component. More...

bool	Interpolate (const double point[3], double *value)
	Sample the input data. More...

void	SetOutValue (double outValue)
	The value to return when the point is out of bounds. More...

double	GetOutValue ()

void	SetTolerance (double tol)
	The tolerance to apply when checking whether a point is out of bounds. More...

double	GetTolerance ()

void	SetComponentOffset (int offset)
	This method specifies which component of the input will be interpolated, or if ComponentCount is also set, it specifies the first component. More...

int	GetComponentOffset ()

void	SetComponentCount (int count)
	This method specifies the number of components to extract. More...

int	GetComponentCount ()

int	ComputeNumberOfComponents (int inputComponents)
	Compute the number of output components based on the ComponentOffset, ComponentCount, and the number of components in the input data. More...

int	GetNumberOfComponents ()
	Get the number of components that will be returned when Interpolate() is called. More...

void	SetSlidingWindow (bool x)
	Enable sliding window for separable kernels. More...

void	SlidingWindowOn ()

void	SlidingWindowOff ()

bool	GetSlidingWindow ()

void	InterpolateIJK (const double point[3], double *value)
	A version of Interpolate that takes structured coords instead of data coords. More...

void	InterpolateIJK (const float point[3], float *value)
	A version of Interpolate that takes structured coords instead of data coords. More...

bool	CheckBoundsIJK (const double x[3])
	Check an x,y,z point to see if it is within the bounds for the structured coords of the image. More...

bool	CheckBoundsIJK (const float x[3])
	Check an x,y,z point to see if it is within the bounds for the structured coords of the image. More...

void	SetBorderMode (int mode)
	The border mode (default: clamp). More...

void	SetBorderModeToClamp ()
	The border mode (default: clamp). More...

void	SetBorderModeToRepeat ()
	The border mode (default: clamp). More...

void	SetBorderModeToMirror ()
	The border mode (default: clamp). More...

int	GetBorderMode ()
	The border mode (default: clamp). More...

const char *	GetBorderModeAsString ()
	The border mode (default: clamp). More...

void	InterpolateRow (vtkInterpolationWeights &weights, int xIdx, int yIdx, int zIdx, double value, int n)
	Get a row of samples, using the weights that were precomputed by PrecomputeWeightsForExtent. More...

void	InterpolateRow (vtkInterpolationWeights &weights, int xIdx, int yIdx, int zIdx, float value, int n)
	Get a row of samples, using the weights that were precomputed by PrecomputeWeightsForExtent. More...

virtual double *	GetSpacing ()
	Get the spacing of the data being interpolated. More...

virtual void	GetSpacing (double &, double &, double &)
	Get the spacing of the data being interpolated. More...

virtual void	GetSpacing (double[3])
	Get the spacing of the data being interpolated. More...

virtual double *	GetOrigin ()
	Get the origin of the data being interpolated. More...

virtual void	GetOrigin (double &, double &, double &)
	Get the origin of the data being interpolated. More...

virtual void	GetOrigin (double[3])
	Get the origin of the data being interpolated. More...

virtual int *	GetExtent ()
	Get the extent of the data being interpolated. More...

virtual void	GetExtent (int &, int &, int &, int &, int &, int &)
	Get the extent of the data being interpolated. More...

virtual void	GetExtent (int[6])
	Get the extent of the data being interpolated. More...

int *	GetWholeExtent ()
	Get the whole extent of the data being interpolated, including parts of the data that are not currently in memory. More...

void	GetWholeExtent (int extent[6])
	Get the whole extent of the data being interpolated, including parts of the data that are not currently in memory. More...

Public Member Functions inherited from vtkObject
	vtkBaseTypeMacro (vtkObject, vtkObjectBase)

virtual void	DebugOn ()
	Turn debugging output on. More...

virtual void	DebugOff ()
	Turn debugging output off. More...

bool	GetDebug ()
	Get the value of the debug flag. More...

void	SetDebug (bool debugFlag)
	Set the value of the debug flag. More...

virtual void	Modified ()
	Update the modification time for this object. More...

virtual vtkMTimeType	GetMTime ()
	Return this object's modified time. More...

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

vtkTypeBool	HasObserver (unsigned long event)

vtkTypeBool	HasObserver (const char *event)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkCommand *	GetCommand (unsigned long tag)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObserver (vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Allow user to set the AbortFlagOn() with the return value of the callback method. More...

int	InvokeEvent (unsigned long event, void *callData)
	This method invokes an event and return whether the event was aborted or not. More...

int	InvokeEvent (const char event, void callData)
	This method invokes an event and return whether the event was aborted or not. More...

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const
	Return the class name as a string. More...

virtual void	Delete ()
	Delete a VTK object. More...

virtual void	FastDelete ()
	Delete a reference to this object. More...

void	InitializeObjectBase ()

void	Print (ostream &os)
	Print an object to an ostream. More...

virtual void	Register (vtkObjectBase *o)
	Increase the reference count (mark as used by another object). More...

virtual void	UnRegister (vtkObjectBase *o)
	Decrease the reference count (release by another object). More...

int	GetReferenceCount ()
	Return the current reference count of this object. More...

void	SetReferenceCount (int)
	Sets the reference count. More...

void	PrintRevisions (ostream &)
	Legacy. More...

virtual void	PrintHeader (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

virtual void	PrintTrailer (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

Static Public Member Functions
static vtkImageSincInterpolator *	New ()

static vtkTypeBool	IsTypeOf (const char *type)

static vtkImageSincInterpolator *	SafeDownCast (vtkObjectBase *o)

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

static vtkAbstractImageInterpolator *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkObject
static vtkObject *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

static void	BreakOnError ()
	This method is called when vtkErrorMacro executes. More...

static void	SetGlobalWarningDisplay (int val)
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOn ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOff ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static int	GetGlobalWarningDisplay ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool	IsTypeOf (const char *name)
	Return 1 if this class type is the same type of (or a subclass of) the named class. More...

static vtkObjectBase *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkImageSincInterpolator ()

	~vtkImageSincInterpolator () override

void	InternalUpdate () override
	Update the interpolator. More...

void	InternalDeepCopy (vtkAbstractImageInterpolator *obj) override
	Copy the interpolator. More...

virtual void	BuildKernelLookupTable ()
	Build the lookup tables used for the interpolation. More...

virtual void	FreeKernelLookupTable ()
	Free the kernel lookup tables. More...


void	GetInterpolationFunc (void(*doublefunc)(vtkInterpolationInfo , const double[3], double *)) override
	Get the interpolation functions. More...

void	GetInterpolationFunc (void(*floatfunc)(vtkInterpolationInfo , const float[3], float *)) override
	Get the interpolation functions. More...


void	GetRowInterpolationFunc (void(*doublefunc)(vtkInterpolationWeights , int, int, int, double *, int)) override
	Get the row interpolation functions. More...

void	GetRowInterpolationFunc (void(*floatfunc)(vtkInterpolationWeights , int, int, int, float *, int)) override
	Get the row interpolation functions. More...

Protected Member Functions inherited from vtkAbstractImageInterpolator
	vtkAbstractImageInterpolator ()

	~vtkAbstractImageInterpolator () override

virtual void	GetSlidingWindowFunc (void(*doublefunc)(vtkInterpolationWeights , int, int, int, double *, int))
	Get the sliding window interpolation functions. More...

virtual void	GetSlidingWindowFunc (void(*floatfunc)(vtkInterpolationWeights , int, int, int, float *, int))
	Get the sliding window interpolation functions. More...

Protected Member Functions inherited from vtkObject
	vtkObject ()

	~vtkObject () override

void	RegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=nullptr)
	These methods allow a command to exclusively grab all events. More...

void	InternalReleaseFocus ()
	These methods allow a command to exclusively grab all events. More...

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	Extent [6]

double	Spacing [3]

double	Origin [3]

double	OutValue

double	Tolerance

int	BorderMode

int	ComponentOffset

int	ComponentCount

bool	SlidingWindow

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

Examples:: vtkImageSincInterpolator (Examples)

Tests:: vtkImageSincInterpolator (Tests)

Definition at line 59 of file vtkImageSincInterpolator.h.

Member Typedef Documentation

typedef vtkAbstractImageInterpolator vtkImageSincInterpolator::Superclass

Definition at line 64 of file vtkImageSincInterpolator.h.

Constructor & Destructor Documentation

vtkImageSincInterpolator::vtkImageSincInterpolator ( )

protected

vtkImageSincInterpolator::~vtkImageSincInterpolator ( )

overrideprotected

Member Function Documentation

static vtkImageSincInterpolator* vtkImageSincInterpolator::New ( )

static

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

static

virtual vtkTypeBool 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

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

overridevirtual

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 77 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 79 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 81 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 83 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 85 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 87 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 89 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 91 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 93 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 95 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 97 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 99 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

Definition at line 111 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

Definition at line 118 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::UseWindowParameterOff ( )

inline

Definition at line 119 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetUseWindowParameter ( )

inline

Definition at line 120 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

Definition at line 131 of file vtkImageSincInterpolator.h.

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

overridevirtual

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 nullptr 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 151 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 153 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 157 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

Definition at line 171 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::AntialiasingOff ( )

inline

Definition at line 172 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetAntialiasing ( )

inline

Definition at line 173 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

Definition at line 183 of file vtkImageSincInterpolator.h.

void vtkImageSincInterpolator::RenormalizationOff ( )

inline

Definition at line 184 of file vtkImageSincInterpolator.h.

int vtkImageSincInterpolator::GetRenormalization ( )

inline

Definition at line 185 of file vtkImageSincInterpolator.h.

bool vtkImageSincInterpolator::IsSeparable ( )

overridevirtual

Returns true if the interpolator supports weight precomputation.

This will always return true for this interpolator.

Implements vtkAbstractImageInterpolator.

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

overridevirtual

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.

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

overridevirtual

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.

void vtkImageSincInterpolator::FreePrecomputedWeights ( vtkInterpolationWeights *& weights )

overridevirtual

Free the precomputed weights.

THIS METHOD IS THREAD SAFE.

Reimplemented from vtkAbstractImageInterpolator.

void vtkImageSincInterpolator::InternalUpdate ( )

overrideprotectedvirtual

Update the interpolator.

Implements vtkAbstractImageInterpolator.

void vtkImageSincInterpolator::InternalDeepCopy ( vtkAbstractImageInterpolator * obj )

overrideprotectedvirtual