Package net.imglib2.interpolation.randomaccess

Class LanczosInterpolator<T extends RealType<T>>

java.lang.Object

net.imglib2.AbstractEuclideanSpace

net.imglib2.position.transform.AbstractPositionableTransform<LocalizablePositionable>

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 int	alpha
protected boolean	clip
protected T	interpolatedValue
protected double[]	lut
protected static int	lutScale
protected long[]	max
protected double	maxValue
protected double	minValue
protected static double	piSquare
protected double[]	products
protected long[]	size

Fields inherited from class net.imglib2.position.transform.FloorOffset

offset

Fields inherited from class net.imglib2.position.transform.AbstractPositionableTransform

discrete, position, target

Fields inherited from class net.imglib2.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 void	accumulate(int d)
RealRandomAccess<T>	copy()
private static double[]	createLanczosLUT(int max, int scale)
private static 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 double	lanczos(double x, double a)
private double	lookUpLanczos(double x)
protected void	resetKernel()

Methods inherited from class net.imglib2.position.transform.FloorOffset

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

Methods inherited from class net.imglib2.position.transform.AbstractPositionableTransform

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

Methods inherited from class net.imglib2.AbstractEuclideanSpace

numDimensions

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.imglib2.EuclideanSpace

numDimensions

Methods inherited from interface net.imglib2.Positionable

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

Methods inherited from interface net.imglib2.RealLocalizable

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

Methods inherited from interface net.imglib2.RealPositionable

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

Methods inherited from interface net.imglib2.RealRandomAccess

copyRealRandomAccess, setPositionAndGet, setPositionAndGet, setPositionAndGet

Field Detail

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 Detail

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 Detail

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)