threshold

Name

threshold - threshold an image with specified threshold

Syntax

threshold [-l <lpv>] [-h <hpv>] \ <input image> <output image> <threshold>

Description

threshold thresholds an image. Pixels below or equal to threshold is set to lpv (low pixel value), pixels above threshold are set to hpv. Default values 0 and 255 can be modified with the -l and -h switches.

 if (old_pixel_value LE threshold) new_pixel_value = lpv
 else new_pixel_value = hpv;

Restrictions

Acepts only UNS_BYTE pixels.

Author

Tor Lønnestad, BLAB, IfI, UiO

Examples

 threshold mona.img monath.img 110
 threshold -h 1 mona.img monath.img 150
 threshold -l 255 -h 0 mona.img monath.img 127

Id

$Id: threshold.c,v 1.26 1996/11/08 14:06:13 svein Exp $