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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
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>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
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