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THRESHOLD
Section: C Library Functions (3)
Updated: 16 Mar 1998
Index
NAME
threshold, thresholdSpOut - threshold a band with specifiedthreshold
SYNTAX
#include <
xite/threshold.h>
int threshold( IBAND b1, IBAND b2, int t );
int thresholdSpOut( IBAND b1, IBAND b2, int t,
int lpv, int hpv );
DESCRIPTION
thresholdand
thresholdSpOutthresholds
b1into
b2with threshold
t.
if (b1[x,y] LE t) b2[x,y] = lpv; else b2[x,y] = hpv;
thresholduses 0 for low pixel value (lpv)and 255for high pixel value (hpv),while thresholdSpOutuses the supplied arguments.Only largest common rectangle of b1and b2is thresholded. Accepts only UNS_BYTE pixles.Identical in- and out- parameters are legal.<lpv> and <hpv> should be in 1..255.
RETURN VALUE
0 => ok
1 => Bad input pixel type
2 => Bad output pixel type
3 => Bad lpv value (only thresholdSpOut)
4 => Bad hpv value (only thresholdSpOut)
AUTHOR
Tor L|nnestad, BLAB, IfI, UiO
ID
$Id: threshold.c,v 1.26 1996/11/08 14:06:13 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- RETURN VALUE
- AUTHOR
- ID
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