期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 1
出版社：Copernicus Publications
摘要：Accurate time registration, georeferencing, and instantaneous feature extraction are important challenges for real-time mapping systems. The Geodetic Engineering Laboratory (TOPO) at the EPFL has designed a mobile platform to automatically determine the geometry of the road centerline: the Photobus. Our system fully exploits the concept of direct georeferencing by combining navigation data with video sequences grabbed by a downward-pointing camera. This paper presents the realization of the authors' vision of real-time mapping that encompasses a mobile acquisition platform dedicated for a well-defined task. To sustain the high performance requirements of such a data-critical application, the use of custom-made software based on open-source libraries is a preferred approach of implementation. In this context, we investigate the suitability of using a close-to-nadiral CMOS camera to extract the road geometry with a reliable and almost latency-free methodology. We will first focus on the frame-grabbing process for which an open-source approach guarantees the versatile integration of the camera into the mapping platform. The second part of the paper discusses the process of extracting and georeferencing features of interest in an automatic manner. To open perspectives, we will investigate an extension of the surveying capabilities of the Photobus with stereovision
关键词：Automation; Calibration; CMOS; Close Range; Mobile Mapping; Real-Time
