[GRASS-user] OCR

[Markus Neteler]

On Mon, May 9, 2011 at 5:06 AM, John C. Tull <jctull at gmail.com> wrote:
> You can also try to select by color in Gimp. I've done this in the past with varying degrees of success. Gimp allows you to adjust the threshold on those types of selects. GRASS's r.thin and r.to.vect might come in handy if you get any useful information from this technique. Obviously, it is dependent on the map and whether or not features that you are hoping to extract have unique, or nearly so, colors.

In this regard also check the "r.seg" extension from Alfonso Vitti,
Univ. of Trento
(find in GRASS Addons) which does wonders in preprocessing such data.

Markus