The use of multi camera systems to determine 3D object coordinates is a common approach in close
range photogrammetry. The paper discusses system configurations based on a single camera and
mirror systems to generate a virtual multi camera system. The two main advantages of mirror-based
multiple-view vision systems can be seen in the lack of synchronisation requirements and the costs
of only one camera. The latter applies especially if high speed cameras are required to capture the
dynamics of an application. These advantages have to be weighted against the disadvantages of a
reduced active image format per view and the restrictions to the imaging geometry.
In the paper we present two different systems used for motion analysis applications: A fixed two
mirror system is used to analyse pedestrian protection testing in the context of vehicle safety
development, and a flexible four mirror system is used to capture 3D velocity fields of particles
visualising gas flows in a wind tunnel. A geometric model for multi-mirror stereoscopic systems has
been developed, representing the mirror system by multiple virtual cameras in order to warrant
compatibility with existing photogrammetric stereo data processing software solutions. The
accuracies achieved in practical tests are almost comparable to those obtained with multi camera
systems.
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