The Ohio State University Highway Mapping System: The Stereo Vision System Component

Kurt Novak

Abstract:	The digital stereo-vision system of the highway mapping van developed at the Ohio State University is &scribed in this paper. Its components and its functionality are explained in connection with the other sensors mounted on the van (a GPS receiver and an inertial system). The major purpose of the stereo-vision system is to capture image-pairs once every Tecond while the van is moving at highway speeds and to reference them to the GPS positions recorded at the same time. Algorithms were developed to calibrate the digital cameras, using analytical photogrammetrk methods. TO find their location relative to the GPS antenna the offset between antenna andperspective centers of the cameras were determined by geodetic methods. These positions are related to a coordinate system connected to the van. Every object in the field of view of both cameras can be positioned to about IO cm in front of the van. By applying GPS coordinates and inertial measurements a transformation into a global system is possible. The automatic analysis of digital stereo-images is demonstrated by the extraction of the edges of a road. The major objective offuture research will be the automation of spatial image analysis. This wifl pennit to derive features while driving the van, which is the only means of handling the enormous amounts of data collected by this system.
Published in:	Proceedings of the 47th Annual Meeting of The Institute of Navigation (1991) June 10 - 12, 1991 Williamsburg Hilton and National Conference Center Williamsburg, VA
Pages:	121 - 124
Cite this article:	Novak, Kurt, "The Ohio State University Highway Mapping System: The Stereo Vision System Component," Proceedings of the 47th Annual Meeting of The Institute of Navigation (1991), Williamsburg, VA, June 1991, pp. 121-124.
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