net.sourceforge.javaocr.plugin.moment
Class CentralMomentFilter

java.lang.Object
  net.sourceforge.javaocr.plugin.moment.AbstractMomentFilter
      net.sourceforge.javaocr.plugin.moment.CentralMomentFilter

All Implemented Interfaces:

ImageFilter

public class CentralMomentFilter
extends AbstractMomentFilter

computes central moments of image. see wikipedia or book of your choice about details. needs M10 & M01 to be computed before using it

Field Summary

(package private) double	xMean
(package private) double	yMean

Fields inherited from class net.sourceforge.javaocr.plugin.moment.AbstractMomentFilter

coeffx, coeffy, moment, p, q

Constructor Summary

CentralMomentFilter(int p, int q, double xMean, double yMean)

Method Summary

double	normalise(double m00) normalise, not sure whether this has be done here...
protected double[]	precomputeX(Image image) precompute x coefficient array
protected double[]	precomputeY(Image image) precompute y coefficients array

Methods inherited from class net.sourceforge.javaocr.plugin.moment.AbstractMomentFilter

getMoment, process

Methods inherited from class java.lang.Object

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

Field Detail

xMean

double xMean

yMean

double yMean

Constructor Detail

CentralMomentFilter

public CentralMomentFilter(int p,
                           int q,
                           double xMean,
                           double yMean)

Parameters:

p - order of x

q - order of y

xMean - M10

yMean - M01

Method Detail

precomputeX

protected double[] precomputeX(Image image)

Description copied from class: AbstractMomentFilter

precompute x coefficient array

Specified by:

precomputeX in class AbstractMomentFilter

precomputeY

protected double[] precomputeY(Image image)

Description copied from class: AbstractMomentFilter

precompute y coefficients array

Specified by:

precomputeY in class AbstractMomentFilter

normalise

public double normalise(double m00)

normalise, not sure whether this has be done here...

Parameters:

m00 -

Returns:

normalised moment value