``border of binary vol'' -- find borders in a binary volume

purpose:

Locate the outer borders of objects in a binary-valued volume.

The border-detection operation is done via the mathematical morphology operation

where volume is the input binary-valued volume. The connectivity selected (parameter ``conectivity = '') determines the connectivity property of border points.

input:

An 8-bit binary-valued volume.

output:

An 8-bit binary-valued volume.

parameters:

Default parameters menu is

connectivity = 6
input from vol # = 0
copy output to vol # = 0

When ``connectivity = 6'', all ``1'' points in the input volume that are 6-connected to a ``0'' (points in the background) are singled out as border points. A similar interpretation applies to the case ``connectivity = 26''.

comments:

1. A moderately fast operation, taking slightly longer than an erosion.

Updated: Fri May 19 14:39:07 CDT