Module imagingbook.common

Package imagingbook.common.threshold.global

Class OtsuThresholder

java.lang.Object

imagingbook.common.threshold.global.OtsuThresholder

All Implemented Interfaces:

GlobalThresholder, Thresholder

public class OtsuThresholder
extends Object
implements GlobalThresholder

This is an implementation of the global thresholder proposed by Otsu [1]. See Sec. 9.1.4 (Alg. 9.4 and 9.3) in [2] for a detailed description.

[1] N. Otsu, "A threshold selection method from gray-level histograms", IEEE Transactions on Systems, Man, and Cybernetics 9(1), 62-66 (1979).
[2] W. Burger, M.J. Burge, Digital Image Processing – An Algorithmic Introduction, 3rd ed, Springer (2022).

Version:

2022/08/21

Nested Class Summary

Nested classes/interfaces inherited from interface imagingbook.common.threshold.Thresholder

Thresholder.BackgroundMode

Field Summary

Fields inherited from interface imagingbook.common.threshold.global.GlobalThresholder

NoThreshold

Constructor Summary

Constructors

Constructor	Description
OtsuThresholder()

Method Summary

Modifier and Type	Method	Description
float	getThreshold(int[] h)	Returns a single (global) threshold value for the specified histogram.

Methods inherited from class java.lang.Object

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

Methods inherited from interface imagingbook.common.threshold.global.GlobalThresholder

getThreshold, threshold

Constructor Details

OtsuThresholder

public OtsuThresholder()

Method Details

getThreshold

public float getThreshold(int[] h)

Description copied from interface: GlobalThresholder

Returns a single (global) threshold value for the specified histogram.

Specified by:

getThreshold in interface GlobalThresholder

Parameters:

h - a histogram (array of frequencies)

Returns:

a single (global) threshold value