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Optimization-based extrinsic calibration of a three-dimensional sensor composed of an array projector and a single camera

 
: Wong, E.; Heist, S.; Bräuer-Burchardt, C.; Stark, A.; Babovsky, H.; Kowarschik, R.

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Optical engineering 58 (2019), No.10, Art. 104109, 9 pp.
ISSN: 0091-3286
ISSN: 0036-1860
ISSN: 1560-2303
English
Journal Article
Fraunhofer IOF ()

Abstract
We previously presented a technique calibrating a multiaperture array projector (MAAP) for performing high-speed three-dimensional (3-D) surface topology measurements with aperiodic sinusoidal fringe structured illumination. Although a stereo-camera setup used to be required for triangulation, the presented MAAP calibration technique re-enables photogrammetric 3-D measurements to be made using a single CCD or CMOS camera. For such a monocular-view photogrammetric system, intrinsic camera calibration, intrinsic projector calibration, and extrinsic system calibration are vital to obtain high-measurement performance. However, there is currently no such technique that can comprehensively perform the required extrinsic system calibration when using an MAAP and a single-camera setup. A comprehensive optimization-based method is proposed and the resulting measurement performance is evaluated. With the new calibration technique, we are able to achieve a surface standard deviation of ∼50 μm.

: http://publica.fraunhofer.de/documents/N-572266.html