Modeling and Calibration of a Structured-light Optical CMM via Skewed Frame Representation

[+] Author and Article Information
Chenggang Che, Jun Ni

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109

J. Manuf. Sci. Eng 118(4), 595-603 (Nov 01, 1996) (9 pages) doi:10.1115/1.2831072 History: Received January 01, 1995; Revised August 01, 1995; Online January 17, 2008


A new tetrahedron-target-based approach is presented for the extrinsic calibration of a non-contact “light-striping” (structured light) optical coordinate measuring machine (CMM). The procedure makes automated on-line calibration possible. The system modeling is based on a unique skewed frame representation without the use of pin-hole camera model assumption. It is demonstrated that the extrinsic calibration matrix can be decomposed into two classes of transformations, one homogeneous and the other nonhomogeneous. The nonhomogeneous transformation between a Cartesian world frame and the non-Cartesian skewed sensor frame is studied. The sensitivity of the dimensional deformation on the two skew angles is simulated. Experimental studies show that a micron level calibration accuracy can be achieved.

Copyright © 1996 by The American Society of Mechanical Engineers
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