at.mug.iqm.commons.util

Class Otsu

java.lang.Object

at.mug.iqm.commons.util.Otsu

public class Otsu
extends Object

Implementation of Otsu's thresholding algorithm

Author:

2012 11 Jürgen Kleinowitz

Field Summary

Fields

Modifier and Type	Field and Description
(package private) javax.media.jai.Histogram	histo
private static org.apache.log4j.Logger	logger

Constructor Summary

Constructors

Constructor and Description
Otsu()
Otsu(javax.media.jai.Histogram histo)

Method Summary

Modifier and Type	Method and Description
private double	calcOtsu(int[] histogram) Otsu calculation for a single band based on http://www.labbookpages.co.uk/software/imgProc/otsuThreshold.html
double[]	calcThreshold() Calculates a threshold for each of the bands stored in histo
void	setHisto(javax.media.jai.Histogram histo)

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final org.apache.log4j.Logger logger

histo

javax.media.jai.Histogram histo

Constructor Detail

Otsu

public Otsu()

Otsu

public Otsu(javax.media.jai.Histogram histo)

Method Detail

calcThreshold

public double[] calcThreshold()

Calculates a threshold for each of the bands stored in histo

Returns:

an array of threshold values

calcOtsu

private double calcOtsu(int[] histogram)

Otsu calculation for a single band based on http://www.labbookpages.co.uk/software/imgProc/otsuThreshold.html

Parameters:

histogram - an int[] array containing the histogram

Returns:

double threshold

setHisto

public void setHisto(javax.media.jai.Histogram histo)