Instrumentation, Measurement, and Metrology

Flexible calibration procedure for fringe projection profilometry

[+] Author Affiliations
Javier Vargas

Universidad Complutense de Madrid, Optics Department, Facultad de CC. Fisicas, Ciudad Universitaria s/n, 28040 Madrid, Spain

Juan Antonio Quiroga

Universidad Complutense de Madrid, Optics Department, Facultad de CC. Fisicas, Ciudad Universitaria s/n, 28040 Madrid, Spain

M. José Terrón-López

Universidad Europea de Madrid, Escuela Superior Politécnica, Electronic and Communications Department, 28670-Villaviciosa de Odón, Spain

Opt. Eng. 46(2), 023601 (February 27, 2007). doi:10.1117/1.2709855
History: Received March 14, 2006; Revised July 19, 2006; Accepted July 24, 2006; Published February 27, 2007
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A novel calibration method for whole field three-dimensional shape measurement by means of fringe projection is presented. Standard calibration techniques, polynomial-and model-based, have practical limitations such as the difficulty of measuring large fields of view, the need to use precise z stages, and bad calibration results due to inaccurate calibration points. The proposed calibration procedure is a mixture of the two main standard techniques, sharing their benefits and avoiding their main problems. In the proposed method, an absolute phase is projected over marked planes placed at unknown positions. The corresponding absolute phase and marks positions are recovered for each plane location. Using Zhang’s calibration method, internal camera parameters (also called intrinsic parameters) and the spatial position for each plane are computed. Later on, a polynomial fit of depth with respect to the phase is performed. To obtain the absolute position of an object point, the depth coordinate is obtained by means of the polynomial calibration and its absolute phase. Then the lateral coordinates are computed from the depth, the internal parameters, and the pixel coordinates of the imaged point. Experimental results comparing the proposed method with the standard polynomial-based calibration are shown, demonstrating the feasibility of the proposed technique.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Topics

Calibration ; Cameras

Citation

Javier Vargas ; Juan Antonio Quiroga and M. José Terrón-López
"Flexible calibration procedure for fringe projection profilometry", Opt. Eng. 46(2), 023601 (February 27, 2007). ; http://dx.doi.org/10.1117/1.2709855


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