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THRESBERNSEN

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

NAME

thresBernsen - local treshold by the method of Bernsen.

SYNTAX

#include <xite/threshold.h>

int thresBernsen( IBAND inband, IBAND outband,
int cmin, int dx, int dy, int lpv, int hpv,
int low );

DESCRIPTION

If the difference between the largest and the smallestpixel value within the dx*dywindow is greater thanor equal to cmin(local contrast threshold), the averageof the two values is used as threshold. Pixels below thisthreshold are set to lpv,and pixels above are set to hpv.

If lowis TRUE, pixels in homogenous areas (differencebelow cmin)are assumed to be below the threshold and areset to lpv,and if lowis FALSE these pixels are setto hpv.

RESTRICTIONS

inbandand outbandmust have pixel type unsigned byte.

REFERENCE

Bernsen, J: "Dynamic thresholding of grey-level images"Proc. of the 8th ICPR, Paris, Oct 1986, 1251-1255.

RETURN VALUE

0 => ok
1 => bad pixel type inband
2 => bad pixel type outband
3 => bad cmin value
4 => bad dx or dy value
5 => bad lpv or hpv value
6 => not enough memory

AUTHOR

Olav Borgli and Tor Lřnnestad, BLAB, Ifi, UiO

ID

$Id: thresBernsen.c,v 1.22 1997/01/14 13:10:39 svein Exp $

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