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THRESLLOYD

Section: C Library Functions (3)
Updated: 16 Mar 1998
Index

NAME

thresLloyd - threshold by the method of Lloyd

SYNTAX

#include <xite/threshold.h>

int thresLloyd( histogram h );

DESCRIPTION

thresLloydcalculates the threshold value by usingthe method of Lloyd, 1985. Initially, the thresholdvalue is set to the average brightness. Then,iteratively, the threshold is set to the average ofthe mean of the pixels below the threshold, and themean of the pixels above the threshold , PLUS acompensation factor depending on the varince of thedistribution. When the threshold value remainsconstant, iteration terminates.

The actual thresholding is not performed, see theroutine "threshold".

RESTRICTIONS

RETURN VALUE

The threshold value. Pixel values up to, and including,the return value, is below the threshold.

AUTHOR

Tor L|nnestad, BLAB, ifi, UiO

ID

$Id: thresLloyd.c,v 1.17 1996/11/08 14:06:06 svein Exp $

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