skyview.geometry.distorter

Class DSS.DSSInv

java.lang.Object

skyview.geometry.Transformer

skyview.geometry.Distorter

skyview.geometry.distorter.DSS.DSSInv

All Implemented Interfaces:

java.io.Serializable, Component

Enclosing class:

DSS

public class DSS.DSSInv
extends Distorter

This inner class is the inverse of the DSS Distorter and corrects the distortion generated there. For the DSS projection, this direction is described analytically using a polynomial expansion, while the 'forward' distortion must be done by inverting the polynomial using Newton's method.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DSSInv()

Method Summary

Modifier and Type	Method and Description
java.lang.String	getDescription() Get a description of this component
java.lang.String	getName() Get the name of this component
Distorter	inverse() Get the inverse Distorter
Distorter	invert() Get the forward distorter back
boolean	isInverse(Transformer t) Is this the inverse of another distorter?
double[][]	jacobian(double[] x) Get the local Jacobian for the distortion.
void	transform(double[] x, double[] y) Transform a point

Methods inherited from class skyview.geometry.Distorter

applyBeforeScaling, getInputDimension, getOutputDimension

Methods inherited from class skyview.geometry.Transformer

transform, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

DSSInv

public DSSInv()

Method Detail

invert

public Distorter invert()

Get the forward distorter back

getName

public java.lang.String getName()

Get the name of this component

Specified by:

getName in interface Component

Specified by:

getName in class Distorter

getDescription

public java.lang.String getDescription()

Get a description of this component

Specified by:

getDescription in interface Component

Specified by:

getDescription in class Distorter

inverse

public Distorter inverse()

Get the inverse Distorter

Specified by:

inverse in class Distorter

isInverse

public boolean isInverse(Transformer t)

Is this the inverse of another distorter?

Specified by:

isInverse in class Transformer

transform

public void transform(double[] x,
                      double[] y)

Transform a point

Specified by:

transform in class Transformer

Parameters:

x - The input vector.

y - The output vector, it may be the same as the input vector if the dimensionalities are the same. All transformers are expected to work with aliased inputs and output.

jacobian

public double[][] jacobian(double[] x)

Description copied from class: Distorter

Get the local Jacobian for the distortion. This implementation defers the calculation to the inverse distorter. Clearly this will need to be overriden in either the forward or backward distorter.

Overrides:

jacobian in class Distorter

Parameters:

x - The input position.

Returns:

The Jabobian matrix.