Class LanczosInterpolator<T extends RealType<T>>

java.lang.Object

net.imglib2.AbstractEuclideanSpace

net.imglib2.position.transform.AbstractPositionableTransform<RandomAccess<T>>

net.imglib2.position.transform.FloorOffset<RandomAccess<T>>

net.imglib2.interpolation.randomaccess.LanczosInterpolator<T>

All Implemented Interfaces:

EuclideanSpace, Positionable, RealLocalizable, RealPositionable, RealRandomAccess<T>, Sampler<T>, Typed<T>

public class LanczosInterpolator<T extends RealType<T>>
extends FloorOffset<RandomAccess<T>>
implements RealRandomAccess<T>

n-dimensional double-based Lanczos Interpolation

Field Summary

Fields

Modifier and Type	Field	Description
protected final int	alpha
protected final boolean	clip
protected final T	interpolatedValue
protected final double[]	lut
protected static final int	lutScale
protected final long[]	max
protected final double	maxValue
protected final double	minValue
protected static final double	piSquare
protected final double[]	products
protected final long[]	size

Fields inherited from class FloorOffset

offset

Fields inherited from class AbstractPositionableTransform

discrete, position, target

Fields inherited from class AbstractEuclideanSpace

n

Constructor Summary

Constructors

Constructor	Description
LanczosInterpolator(LanczosInterpolator<T> interpolator)
LanczosInterpolator(RandomAccessible<T> randomAccessible, int alpha, boolean clip, double min, double max)	Creates a new Lanczos-interpolation

Method Summary

Modifier and Type	Method	Description
protected final void	accumulate(int d)
RealRandomAccess<T>	copy()
private static final double[]	createLanczosLUT(int max, int scale)
private static final long[]	createOffset(int a, int n)
T	get()	Access the actual T instance providing access to a pixel, sub-pixel or integral region value the Sampler points at.
T	getType()	Get an instance of T.
private static final double	lanczos(double x, double a)
private final double	lookUpLanczos(double x)
protected final void	resetKernel()

Methods inherited from class FloorOffset

f, f, f, f, f, move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPosition

Methods inherited from class AbstractPositionableTransform

bck, fwd, getDoublePosition, getFloatPosition, localize, localize, move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPosition, toString

Methods inherited from class AbstractEuclideanSpace

numDimensions

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface EuclideanSpace

numDimensions

Methods inherited from interface Positionable

bck, fwd, move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPosition

Methods inherited from interface RealLocalizable

getDoublePosition, getFloatPosition, localize, localize, localize, positionAsDoubleArray, positionAsRealPoint

Methods inherited from interface RealPositionable

move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPosition

Methods inherited from interface RealRandomAccess

copyRealRandomAccess, setPositionAndGet, setPositionAndGet, setPositionAndGet

Field Details

piSquare

protected static final double piSquare

See Also:

• Constant Field Values

lutScale

protected static final int lutScale

See Also:

• Constant Field Values

alpha

protected final int alpha

interpolatedValue

protected final T extends RealType<T> interpolatedValue

size

protected final long[] size

max

protected final long[] max

minValue

protected final double minValue

maxValue

protected final double maxValue

clip

protected final boolean clip

lut

protected final double[] lut

products

protected final double[] products

Constructor Details

LanczosInterpolator

public LanczosInterpolator(RandomAccessible<T> randomAccessible,
 int alpha,
 boolean clip,
 double min,
 double max)

Creates a new Lanczos-interpolation

Parameters:

randomAccessible - - the RandomAccessible to work on

alpha - - the radius of values to incorporate (typically 2 or 3)

clip - - clips the value to range of the RealType, i.e. tests if the interpolated value is out of range

min - - range for clipping (ignored if min==max)

max - - range for clipping (ignored if min==max)

LanczosInterpolator

public LanczosInterpolator(LanczosInterpolator<T> interpolator)

Method Details

createOffset

private static final long[] createOffset(int a,
 int n)

createLanczosLUT

private static final double[] createLanczosLUT(int max,
 int scale)

resetKernel

protected final void resetKernel()

accumulate

protected final void accumulate(int d)

get

public T get()

Description copied from interface: Sampler

Access the actual T instance providing access to a pixel, sub-pixel or integral region value the Sampler points at.

Specified by:

get in interface Sampler<T extends RealType<T>>

getType

public T getType()

Description copied from interface: Typed

Get an instance of T.

It should not be assumed that the returned T instance is an independent copy. In particular, repeated calls to getType() may return the same instance.

Specified by:

getType in interface Sampler<T extends RealType<T>>

Specified by:

getType in interface Typed<T extends RealType<T>>

Returns:

an instance of T

lanczos

private static final double lanczos(double x,
 double a)

lookUpLanczos

private final double lookUpLanczos(double x)

copy

public RealRandomAccess<T> copy()

Specified by:

copy in interface RealRandomAccess<T extends RealType<T>>

Specified by:

copy in interface Sampler<T extends RealType<T>>

Returns:

- A new Sampler in the same state accessing the same values. It does NOT copy T, just the state of the Sampler. Otherwise use T.copy() if available. Sampler.copy().get() == Sampler.get(), i.e. both hold the same value, not necessarily the same instance (this is the case for an ArrayCursor for example)