vtrace − trace the boundaries of image segments

vtrace [-c4] [min=val] [if=][<filename>] [of=<ofile>]

Vtrace traces the boundary of all connected labeled regions in an image. The background with a value of zero is not traced. A 2D vector boundary is generated for each unique segment encountered. Segments are identified by all connected member pixels having the same grey level value.

Only unsigned byte images are currently accepted for input. Other formats will be accepted in the future.

-c4

The boundary will be traced using a 4-connected rule. The default is that the boundary is 8-connected.

min=value

Set a minimum size for the area of the segments. If a segment covers an area less than value then it is not output.

A. P. Reeves and Christos S. Zoulas