Real-time videogrammetry uncertainty computation and test results

Scott C. Sandwith

doi:10.1117/12.334325

29 December 1998 Real-time videogrammetry uncertainty computation and test results

Scott C. Sandwith

Author Affiliations +

Proceedings Volume 3520, Three-Dimensional Imaging, Optical Metrology, and Inspection IV; (1998) https://doi.org/10.1117/12.334325
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

This report documents system uncertainty, best practices, and process limitations for the real-time videogrammetry system developed by Metronor, ASA. The report describes the system and the tests used to establish its performance. It then documents the test result and draws conclusions. An uncertainty of 23.6 ppm within the 3.2 by 2.8 by 1.5-meter test volume was achieved with the baseline between the cameras parallel to the length of the target field. A slightly lower uncertainty of 18.5 ppm was achieved when the cameras were setup with their baseline normal to the length of the target field.Results suggest that the orientation of the camera baseline relative to the target field does not play a significant role when targets are more than 2 meters apart. Testing shows a significant dependence in system accuracy relative to the apex angle between the cameras and the targets. When the apex angle was between 60 degrees and 95 degrees the performance specification was met. Conclusions drawn from a series of two-sample F-tests of RSS error values establish that sampling a point more than three times does not significantly reduce its uncertainty. This result is in part explained by the redundant fitting of the five-diode points on the light pen: the fitting effects an averaging process even on samples of one.

Citation Download Citation

Scott C. Sandwith "Real-time videogrammetry uncertainty computation and test results", Proc. SPIE 3520, Three-Dimensional Imaging, Optical Metrology, and Inspection IV, (29 December 1998); https://doi.org/10.1117/12.334325

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