Module imagingbook.common

Package imagingbook.common.threshold.global

Class MaxEntropyThresholder

java.lang.Object

imagingbook.common.threshold.global.MaxEntropyThresholder

All Implemented Interfaces:

GlobalThresholder, Thresholder

public class MaxEntropyThresholder
extends Object
implements GlobalThresholder

This is an implementation of the global thresholder proposed by Kapur et al. in [1]. See Sec. 9.1.5 (Alg. 9.5) of [2] for a detailed description.

[1] J. N. Kapur, P. K. Sahoo, and A. K. C. Wong. A new method for gray-level picture thresholding using the entropy of the histogram. Computer Vision, Graphics, and Image Processing 29, 273–285 (1985).
[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
MaxEntropyThresholder()

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

MaxEntropyThresholder

public MaxEntropyThresholder()

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