I've seen some quite awesome apps on the iphone that allow for augmented reality. http://layar.eu/ is one such example from a quick google. And another - http://www.youtube.com/watch?v=5fZk0HaIs4s
2009/8/16 Nick Whitelegg <[email protected]>: > Hello everyone, > > Have been thinking a bit more about my own interests within the > "OpenStreetView" project introduced by John McKerrell at SOTM. My > particular interest is an in the field navigation tools for countryside > users, particularly walkers/hikers/mountaineers etc, which I'm giving the > codename "footnav" for the moment (seeing as John already has > openstreetview and I'm more focusing on the countryside!) > > One option is simply to have a computer generated 3D view from SRTM, OSM > and 3D models of stiles, gates and so on. However I'm quite interested in > using actual photos: the advent of "compass phones" such as the N97 and > latest iPhone makes this a realistic possibility. > > What I'd like to do is build up a database of photos taken along a path or > footway, say every 10 metres or so. If a user wanted to navigate, the app > could locate the nearest photo to them, based on location and direction of > travel, and display it, with their position and OSM data overlaid on the > photo. I was on top of a hill looking down at a valley the other day and > was thinking "how cool would it be if I could see a photo of that valley > and have all the footpaths overlaid on it"! > > I've done a bit of OpenGL and believe something like this could be done if > the position, direction, slope, aspect ratio and field-of-view angle of > each photo were known. Most of these I have ideas on how to obtain, or at > least where to go to look it up, *except* the field of view angle. > > The thing I don't really know much about is: how can you get the > field-of-view angle of a photo taken from a digital camera (either a > standalone camera or within a phone)? I've seen a few explanations on the > web on how you get it from the focal length (which appears to be quoted in > e.g. the N95 specs) but they also require another parameter (the "size of > the film"). Where might I get this from? > > If anyone's an expert on photography theory I'd welcome any explanations > on how to obtain the field-of-view angle of digital photos. > > Thanks, > Nick > > > > > > > > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev > -- Regards, Thomas Wood (Edgemaster) _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
