Module imagingbook.common

Package imagingbook.common.image.interpolation

Class LanczosInterpolator

java.lang.Object

imagingbook.common.image.interpolation.LanczosInterpolator

All Implemented Interfaces:

PixelInterpolator

public class LanczosInterpolator
extends Object
implements PixelInterpolator

A PixelInterpolator implementing Lanczos interpolation in 2D. See Sec. 22.5.4 of [1] for additional details.

[1] W. Burger, M.J. Burge, Digital Image Processing – An Algorithmic Introduction, 3rd ed, Springer (2022).

Constructor Summary

Constructors

Constructor	Description
LanczosInterpolator()	Constructor creating a Lanczos interpolator of order n = 2.
LanczosInterpolator(int n)	Constructor creating a Lanczos interpolator of arbitrary order n ≥ 2.

Method Summary

Modifier and Type	Method	Description
float	getInterpolatedValue(ScalarAccessor ia, double x, double y)	Returns the interpolated pixel value for the specified position.
double	getWeight(double x)	Returns the value of the one-dimensional weight function w(x), that is the weight given to some pixel at distance x from the current interpolation point.

Methods inherited from class java.lang.Object

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

Methods inherited from interface imagingbook.common.image.interpolation.PixelInterpolator

getWeight

Constructor Details

LanczosInterpolator

public LanczosInterpolator()

Constructor creating a Lanczos interpolator of order n = 2.

LanczosInterpolator

public LanczosInterpolator(int n)

Constructor creating a Lanczos interpolator of arbitrary order n ≥ 2.

Parameters:

n - order of the interpolator

Method Details

getInterpolatedValue

public float getInterpolatedValue(ScalarAccessor ia,
 double x,
 double y)

Description copied from interface: PixelInterpolator

Returns the interpolated pixel value for the specified position.

Specified by:

getInterpolatedValue in interface PixelInterpolator

Parameters:

ia - a ScalarAccessor to the interpolated image

x - continuous interpolation position (horiz.)

y - continuous interpolation position (vert.)

Returns:

the interpolated pixel value at position (x,y).

getWeight

public double getWeight(double x)

Description copied from interface: PixelInterpolator

Returns the value of the one-dimensional weight function w(x), that is the weight given to some pixel at distance x from the current interpolation point. This method is primarily used for testing.

Specified by:

getWeight in interface PixelInterpolator

Parameters:

x - the position relative to the interpolation point

Returns:

the weight for this position