[FFmpeg-user] Seeking for filter to recognize and thicken thin curves

[Andrey Utkin]

I am not keen on such thing as objects recognition on image. I'd like
to know if there is filter available in libavfilter, or in the libs
pluggable to it, or even another graphical package, to do what i ask
for: to thicken exactly thin curved lines (if it helps, let's say
there's a limit of its width), these lines of interest all have
certain color.
The application is processing terrain satellite photos, to make small
roads and trails more noticeable.

--
Andrey Utkin