vedge − generic edge operator

vedge [if=<infile>] [of=<outfile>] [th=<value>] [-v] [-g] [-d] [-r] [-s] [-i] [a=]

Vedge is a script that permits a unified way of using a variety of different edge operators; i.e., it is the mother of all edge operators. Without any options, a thresholded edge image using the vderiche edge operator is invoked. Gradient rather than thresholded edge images can be specified with the -g option.

See the specific documentation for the edge operator used for constraints

-g

The -g option specifies that a gradient rather than a thresholded edge image is to be created.

th=

the th= parameter specifies a threshold for the edge image. (the default is 75).

-d

provide direction information in a second channel of the output. (not available when the -r option is specified.)

-s

use the sobel edge operator (vsobel).

-i

use fancy sobel operator with isotropic masks and euclidian distance

-r

use the roberts cross edge operator (vrcross).

a=

set the prefilter parameter for the default deriche (vderiche) edge operator, the default value is 1.0.

A. P. Reeves

vrcross(1), vderiche(1), vsobel(1), vedgex(1)