29 January 2007 Concepts of single highspeed-camera photogrammetric 3D measurement systems
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Abstract
Highspeed cameras form a central component of photogrammetric 3D measurement systems in applications requiring a high temporal resolution in fields such as fast object tracking or high frequency deformation measurement. Current highspeed cameras offer data rates in the order of 1 Gigabyte per second or beyond, delivering for instance 1000 frames per second at 1000×1000 pixels. Most applications using highspeed cameras for visualization or measurement purposes are still 2D. Highspeed camera stereo systems are rare because of the costs of cameras and the lack of synchronizibility of some camera types. The paper gives a short overview on single camera 3D measurement system concepts. It presents two concepts of setting up photogrammetric 3D measurement systems based on a single highspeed camera in detail, one based on a single camera with a stereo mirror system and one on based on a camera-projector combination: A stereo mirror system in front of a camera generates multiple views on one sensor. These views can be considered virtual cameras of a multi-camera photogrammetric measurement system. The paper presents a flexible quadruple-mirror system to be used in 3D motion analysis applications and discusses geometric modeling and system calibration. Photogrammetric surface measurement systems can be configured by a camera and a projector device projecting strip or dot patterns onto a surface. Using the projector as an active element in the system design, dense and accurate 3D surface representations may be generated using coded light approach or phase shift techniques. In the geometric modeling and calibration, the projector can be considered an inverse camera with infinite frame rate. The paper presents results of an accuracy test obtaining a precision potential in the order of 1/50 pixel from a standard consumergrade beamer. Besides the system design and the geometric modeling of the two concepts, the paper shows results from pilot studies and practical applications.
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Hans-Gerd Maas, Hans-Gerd Maas, } "Concepts of single highspeed-camera photogrammetric 3D measurement systems", Proc. SPIE 6491, Videometrics IX, 64910K (29 January 2007); doi: 10.1117/12.703795; https://doi.org/10.1117/12.703795
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