Module imagingbook.common

Package imagingbook.common.image.interpolation

Class SplineInterpolator

java.lang.Object

imagingbook.common.image.interpolation.SplineInterpolator

All Implemented Interfaces:

PixelInterpolator

Direct Known Subclasses:

CatmullRomInterpolator, CubicBSplineInterpolator, MitchellNetravaliInterpolator

public class SplineInterpolator
extends Object
implements PixelInterpolator

A PixelInterpolator implementing spline interpolation in 2D. See Sec. 22.4 of [1] for additional details.

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

Version:

2022/09/16

See Also:

• CatmullRomInterpolator
• CubicBSplineInterpolator
• MitchellNetravaliInterpolator

Constructor Summary

Constructors

Constructor	Description
SplineInterpolator(double a, double b)	Constructor for creating a custom spline interpolator.

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

SplineInterpolator

public SplineInterpolator(double a,
 double b)

Constructor for creating a custom spline interpolator.

Parameters:

a - spline control parameter

b - spline control parameter

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