On Thu, 9 Apr 2009, Matt Amos wrote: > On Thu, Apr 9, 2009 at 11:37 AM, Stefan de Konink <ste...@konink.de> wrote: > > On Thu, 9 Apr 2009, Matt Amos wrote: > >> On Thu, Apr 9, 2009 at 1:05 AM, Tijs Zwinkels > >> <openstreet...@tumblecow.net> wrote: > >> > I mean, come on, one of these methods must be able to detect street > >> > signs. > >> > :) > >> > >> i stumbled across a paper about tracking text in videos[1]. maybe some > >> of the methods they're using are worth looking at and/or extending to > >> symbolic signs? > > > > Text is again siftable because it is complex. But we are talking with > > signs (the basic ones) in shapes/colours. > > they are only using SIFT for tracking. initial detection is done by a > (monochrome) connected components analysis. this might be a useful > tool for detecting street signs, as they generally come in a small > number of untextured colours.
Please review the url's i've send before. It can also be exemplar based. I just heard some other hypeword 'coloursift', but I have to look what the mean. > afaict, the only non-siftable street sign is the circlular > white-with-red-border, right? The one way, preference crossing, will probably also fail. Histograms is the way to go on those. > from a practical point of view, what > %age of road sign instances are that sign? maybe its worth focussing > on the large majority which are siftable and leaving the "grand > unified street sign detector" for a follow-up project. First we need recall, that means a streetsign *detector* then we find out what it is. Stefan _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
