MAN page from Mandrake Other XITE-3.3-3.i386.rpm

THRESSIGMA

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

NAME

thresSigma - threshold at fraction of standard deviation

SYNTAX

thresSigma [-x <x>] [-l <lpv>] [-h <hpv>]
<inimage> [<outimage>]

DESCRIPTION

thresSigmacalculates, and eventually applies,the threshold value by finding the mean (mu) andthe standard deviation (sigma) of the image, andthen finding the threshold by the formula:

t = mu + (x * sigma)

-x <x>     - fraction of standard deviation.
              Default 0
-l <lpv>   - output for low pixels (below thrs.).
              Default 0
-h <hpv>   - output for high pixels (above thrs.).
              Default 255

inimage - input image
outimage - output image

If an output image is given, the input image isthresholded and written to the output image.Otherwise the threshold value is only reportedto standard output.

RESTRICTIONS

Only UNS_BYTE pixels are supported

AUTHOR

Olav Borgli, BLAB, ifi, UiO

EXAMPLES

thresSigma -x -2.5 mona.img monaThres.img

ID

$Id: thresSigma.c,v 1.20 1996/11/08 14:06:11 svein Exp $

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