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CROSSING

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

 

NAME

crossing - find zero crossing or any other crossing

 

SYNTAX

crossing [-t <t>] <inimage> <outimage>

 

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

 

RESTRICTIONS

inimagemust have bands with pixel type unsigned byte.

 

OPTIONS

-t t

Crossing value. Default is 127.

 

SEE ALSO

crossing(3), contour(1)

 

AUTHOR

Tor Lřnnestad, BLAB, Ifi, UiO

 

EXAMPLES

crossing -t 100 mona.img monacross.img

 

ID

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

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Index

NAME

SYNTAX

DESCRIPTION

RESTRICTIONS

OPTIONS

SEE ALSO

AUTHOR

EXAMPLES

ID

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