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- W579454852 abstract "The application of terrestrial (close-range) photogrammetry to transportation engineering was investigated using a PC-based vision system. The key to the use of such a system is the extraction of measurements from digital stereo images within a fraction of a second. Speed and traffic queue lengths obtained using digital and convergent stereo vision technology were compared with those measured by conventional methods (eg, radar speed devices, stop watches and tapes). A 3-D measurement scheme to quantify traffic parameters, based on digital stereo images, was developed. An absolute error of about 2 km/h was obtained for speed measurements. The new method showed potential for producing vehicle speed profiles in different motion cases (slowing down, moving modes, for example). Queue length measurements were accurate to within one metre. Frequent camera calibration, the use of high resolution cameras, and a reliable and stereo- convergent camera configuration enhanced accuracy. Independent stereo convergent cameras, which are not properly oriented with respect to each other, have a major limitation of using object space control in the field of view of the cameras. This in turn affects the automation capability of the PC-based vision system, in spite of its high accuracy potential. Therefore, the use of a dual camera system, which does not require control in the mapped scene, is expected to enhance the degree of automation of the used vision system. A road inventory coding system was developed to produce road features from digital images, and maps were thus generated from digital stereo images. Therefore, the integration of stereo vision systems with GIS systems is possible. Terrestrial photogrammetric techniques are safe, speedy and reliable and they may lead to other non-topographic mapping applications in transportation engineering." @default.
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- W579454852 title "The application of terrestrial photogrammetry to transportation engineering" @default.
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