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THRESBERNSEN

Section: User Commands (1)
Updated: 16 Mar 1998
Index

NAME

thresBernsen - local variable treshold by the method ofBernsen.

SYNTAX

thresBernsen [<option>...] <infile> <outfile> cmin [dx [dy]]

DESCRIPTION

Local variable treshold by the method of Bernsen.

cmin

Local contrast treshold.

dx

Local window width, default 3.

dy

Local window height, default dx.

OPTIONS

-lpv lpv

Low pixel value, default 0.

-hpv hpv

High pixel value, default 255.

-low

Homogenous areas are assumed to be low, belowthe threshold. Default: above the threshold

If the difference between the largest and the smallest pixelvalue within the dx*dywindow is greater than or equal tocmin,the average of the two values is used as threshold.Pixels below this threshold are set to lpv,and pixels aboveare set to hpv.

If -lowis set, pixels in homogenous areas (differencebelow cmin)are assumed to be below the threshold and areset to lpv,otherwise these pixels are set to hpv.

REFERENCE

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

EXAMPLE

thresBernsen mona.img monat.img 100
thresBernsen -lpv 1 -hpv 0 mona.img monat.img 75 35 55

AUTHOR

Olav Borgli and Tor L|nnestad

ID

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

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