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Flexible calibration procedure for fringe projection profilometry

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Quiroga Mellado, Juan Antonio and Vargas, Javier and Terrón López, M. José (2007) Flexible calibration procedure for fringe projection profilometry. Optical Engineering, 46 (2). ISSN 0091-3286

Official URL: http://dx.doi.org/10.1117/1.2709855




Abstract

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.


Item Type:Article
Additional Information:

© 2007 Society of Photo-Optical Instrumentation Engineers.

Uncontrolled Keywords:Projected Fringe Profilometry, Phase-Shifting Technique, Gray Coding, Camera Calibration
Subjects:Sciences > Physics > Optics
ID Code:22895
Deposited On:30 Sep 2013 07:43
Last Modified:14 Oct 2013 12:09

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