Hi Keshan,I'm currently working on the videomapping plugin as my bachelor thesis. I guess this would be a good starting point.
http://wiki.openstreetmap.org/wiki/JOSM/Plugins/VideoMapping
Personaly I'm not that sure, how a detection of signs can be added in the workflow but let's see ;)
Matthias _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
