The measurement of 3D coordinates using optical techniques is well known for more than 50 years. Today, modern photogrammetric systems are based on handheld digital cameras and are used to identify the location of any circular marker or feature on the object's surface. The ease of use and the accurate and automated derivation of 3D coordinates from 2D digital images helped to establish a powerful tool for position control, assembly checks and reverse engineering. A new application is the analysis of real vehicle crashes. The location of hundreds of markers on the damaged vehicle can easily be determined in vehicle body position. These coordinates are being compared to the undeformed geometry and provide herby 3D information on any displacement. Using reverse engineering techniques, surfaces are created from the 3D points and thus a 3D model of the crashed vehicle is available for an easy visualization of the deformation. The method delivers a measurement accuracy that can hardly be achieved by tools nowadays in use. In addition most of the known methods are very time consuming. In comparison: the subject photogrammetry discussed here is able to perform an evaluation of a complete vehicle with up to 5000 measurement points in less than two hours. A clear advantage of the photogrammetric method is the ability to further process the once photographed vehicles. Whenever needed, the measurement can be refined and extended. It is also possible to establish a data base of accident vehicles to allow a comparable examination. Evaluating the direction of the measurement can be refined and extended. It is also possible to establish a data base of accident vehicles to allow a comparable examination. Evaluating the direction of the measurement point displacement caused by the deformation, allows to determine the direction of the impact's forces. These analysis methods are new and possible, only with the help of the subject photogrammetry. This method is most beneficial for the evaluation of real life traffic accidents. Thus the base of information is extended to furgher improve vehicle safety.
Optical coordinate measuring techniques for the determination and visualization of the 3D displacement in crash investigations
Optische Formerfassung für Bestimmung und Visualisierung dreidimensionaler Verschiebungen bei Unfalluntersuchungen
2003
7 Seiten, 13 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
British Library Conference Proceedings | 2003
|British Library Online Contents | 1997
British Library Conference Proceedings | 1998
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