Special Section on High-Speed 3-D Optical Metrology and Applications

Generic design methodology for the development of three-dimensional structured-light sensory systems for measuring complex objects

[+] Author Affiliations
Veronica E. Marin

University of Toronto, Department of Mechanical and Industrial Engineering, Autonomous Systems and Biomechatronics Laboratory, 5 King’s College Road, Toronto, Ontario, M5S 3G8, Canada

Wei Hao Wayne Chang

University of Toronto, Department of Mechanical and Industrial Engineering, Autonomous Systems and Biomechatronics Laboratory, 5 King’s College Road, Toronto, Ontario, M5S 3G8, Canada

Goldie Nejat

University of Toronto, Department of Mechanical and Industrial Engineering, Autonomous Systems and Biomechatronics Laboratory, 5 King’s College Road, Toronto, Ontario, M5S 3G8, Canada

Opt. Eng. 53(11), 112210 (May 07, 2014). doi:10.1117/1.OE.53.11.112210
History: Received February 2, 2014; Revised March 30, 2014; Accepted April 8, 2014
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Abstract.  Structured-light (SL) techniques are emerging as popular noncontact approaches for obtaining three-dimensional (3-D) measurements of complex objects for real-time applications in manufacturing, bioengineering, and robotics. The performance of SL systems is determined by the emitting (i.e., projector) and capturing (i.e., camera) hardware components and the triangulation configuration between them and an object of interest. A generic design methodology is presented to determine optimal triangulation configurations for SL systems. These optimal configurations are determined with respect to a set of performance metrics: (1) minimizing the 3-D reconstruction errors, (2) maximizing the pixel-to-pixel correspondence between the projector and camera, and (3) maximizing the dispersion of the measured 3-D points within a measurement volume, while satisfying design constraints based on hardware and user-defined specifications. The proposed methodology utilizes a 3-D geometric triangulation model based on ray-tracing geometry and pin-hole models for the projector and camera. Using the methodology, a set of optimal system configurations can be determined for a given set of hardware components. The design methodology was applied to a real-time SL system for surface profiling of complex objects. Experiments were conducted with an optimal sensor configuration and its performance verified with respect to a nonoptimal hardware configuration.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Veronica E. Marin ; Wei Hao Wayne Chang and Goldie Nejat
"Generic design methodology for the development of three-dimensional structured-light sensory systems for measuring complex objects", Opt. Eng. 53(11), 112210 (May 07, 2014). ; http://dx.doi.org/10.1117/1.OE.53.11.112210


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