net.sf.ij_plugins.thresholding

Class HistogramThreshold

java.lang.Object

net.sf.ij_plugins.thresholding.HistogramThreshold

public final class HistogramThreshold
extends java.lang.Object

Histogram based thresholding.

Author:

Jarek Sacha

Method Summary

Methods

Modifier and Type	Method and Description
static int	maximumEntropy(int[] hist) Equivalent to calling maximumEntropy(hist, null).
static int	maximumEntropy(int[] hist, ProgressListener progressListener) Calculate maximum entropy split of a histogram.

Methods inherited from class java.lang.Object

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

Method Detail

maximumEntropy

public static int maximumEntropy(int[] hist)

Equivalent to calling maximumEntropy(hist, null).

Parameters:

hist - histogram to be thresholded.

Returns:

index of the maximum entropy split.

See Also:

maximumEntropy(int[], net.sf.ij_plugins.util.progress.ProgressListener)

maximumEntropy

public static int maximumEntropy(int[] hist,
                 ProgressListener progressListener)

Calculate maximum entropy split of a histogram. For more information see: 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", CVGIP, (29), pp.273-285 , 1985.

Returned value indicates split position t. First interval are values less than t, second interval are values equal or larger than t.

If all values in hist are zero, the split, return value, is set to zero.

Parameters:

hist - histogram to be thresholded.

progressListener - progress listener, can be null.

Returns:

index of the maximum entropy split.