Tijs Zwinkels wrote: > > > On Fri, Apr 3, 2009 at 8:51 PM, Stefan de Konink <[email protected] > <mailto:[email protected]>> wrote: > > I would go outside JOSM, and make this a webapp that can be included > as a layer in any editor. WMS like. > > I'm not sure whether this is very suitable for a webapp since it might > require quite some computation, and will generally operate on databases > of pictures that might be a pain to upload. It's certainly possible > though. Maybe we should think about a platform which allows it to be > used both locally and as a webapp.
sift.openstreetphoto.org already has a bunch of usercollected images, all rendered streetsigns from wikipedia. The thing why this should be a client side app is the processing might be actually faster (doubtful on a mobile though). > But please keep in mind that SIFT will *not* work for the typical > streetsign because SIFT looks for features, which are typically not > present in the 'easy to understand' signs (because they use colours). > > Which.. I of course read minutes after the application deadline > expiring. ;) - No sweat, I'll read up on the subject a bit more and keep > on adding new ideas to the proposal on the wiki. You added histograms so I was happy ;) You really want to read 'Indexing Via Color Histograms' Swain/Ballard. > SIFT *might* be able to do some of it's work on features typically > present in street-signs. For example: Many street signs have a white bar > around them. And that is exactly what is failing (for me). What actually works is recognizing of a bicycle. > Otherwise we will have to trust on the color-histogram matching, and > I'll think about other feature detectors to use as well. (suggestions > welcome ofcourse) As provided ;) See also my previous comment about the sharing visual features paper. The sure do magic, especially related to the shrinking of the image. Stefan _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
