Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!rutgers!rochester!PT.CS.CMU.EDU!ROVER.RI.CMU.EDU!nivek From: nivek@ROVER.RI.CMU.EDU (Kevin Dowling) Newsgroups: comp.sys.mac Subject: Re: 3-D Graphics Question Message-ID: <400@PT.CS.CMU.EDU> Date: Thu, 26-Nov-87 08:53:17 EST Article-I.D.: PT.400 Posted: Thu Nov 26 08:53:17 1987 Date-Received: Sun, 29-Nov-87 21:33:58 EST Sender: netnews@PT.CS.CMU.EDU Organization: Carnegie-Mellon University, CS/RI Lines: 30 >From: johnroc@ssyx.ucsc.edu (John Rocchio,,6888601) >Subject: 3-D Graphics Question > >I have digitized a photo of an African village taken from an unknown >altitude and an unknown angle. I am wondering if anyone can recommend >a program that can take this image and rotate it in 3-D so that I can >get an idea of the exact size of the fences surrounding the village, >from all angles. I'm not sure you understand how difficult this problem is. How do you get depth information from a single image? Humans do it pretty well through interpretation, but in a digitized photo (color?, grayscale?) how do you recover that information? Work at CMU can take stereo images (known translation and rotation bwtween images) and can construct 3d scenes in that manner. Other work has taken satellite photos and generated 3-D scenes of cities. All these methods are very computationally expensive. Laser scanners are nice for both depth and relectance and are being used in mobile robot efforts here too. Unless you have more information than you indicated in your post it's going to be a tough problem! nivek Aka : Kevin Dowling Bell: (412) 268-8830 Arpa: nivek@rover.ri.cmu.edu Mail: Robotics Institute Carnegie Mellon University Pgh, PA 15213-3890