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Shape measurement of discontinuous objects using projected fringes and temporal phase unwrapping

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2 Author(s)
Saldner, H.O. ; Optronic Consult AB, Stockholm, Sweden ; Huntley, J.M.

Temporal phase unwrapping is a method of analyzing fringe patterns in which the fringe phase, Φ, at each pixel is measured and unwrapped as a function of time, t. We propose a method for improving the signal-to-noise ratio of the total phase change by incorporating data from the intermediate phase values. The performance of the method is compared theoretical and experimentally, using data from a fringe projector based on a spatial tight modulator. The best way to use the method is with Φ decreasing exponentially with time from its maximum value to zero; this provides significant improvements in reliability, accuracy and computation time compared with the original temporal unwrapping algorithm

Published in:

3-D Digital Imaging and Modeling, 1997. Proceedings., International Conference on Recent Advances in

Date of Conference:

12-15 May 1997