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

CROSSING

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

 

NAME

crossing - find zero crossing or any other crossing

 

SYNTAX

 #include <xite/convolve.h>

 int crossing( IBAND iband, IBAND oband, int t );

 

DESCRIPTION

Can be used to find zero crossing of second derivative,laplace. Can also be used to determine any other kindof crossing. Pixels below or equal to tare set if the pixelto the right or below is above t,pixels above tareset if the pixel to the right or below is below or equal tot.Pixels that are "set" are set to the maximum absolutedifference of the two neighbours, to indicate the strengthof the edge.

 IF (crossing t)
   out(x,y) = MAX(ABS(in(x,y)-in(x+1,y)),
                  ABS(in(x,y)-in(x,y+1)))
 ELSE
   out(x,y) = 0

Identical ibandand obandarguments are allowed.

 

RESTRICTIONS

ibandand obandmust have pixel type unsigned byte.

 

RETURN VALUE

 0 => ok
 1 => bad pixel type input band
 2 => bad pixel type output band

 

SEE ALSO

crossing(1), contour(3)

 

AUTHOR

Tor Lřnnestad, BLAB, Ifi, UiO

 

ID

$Id: crossing.c,v 1.24 1997/01/16 15:53:28 svein Exp $

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Index

NAME

SYNTAX

DESCRIPTION

RESTRICTIONS

RETURN VALUE

SEE ALSO

AUTHOR

ID

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