Using light polarization in laser scanning

Authors:
James Clark;Emanuele Trucco;Lawrence B. Wolff
Affiliations:
Department of Computing and Electrical Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK;Department of Computing and Electrical Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK;Department of Computer Science, The Johns Hopkins University, Baltimore, MD 21218, USA
Venue:
Image and Vision Computing
Year:
1997

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Abstract

We use polarization analysis in triangulation-based laser scanning to disambiguate the true laser stripe from spurious inter-reflections caused by holes and concavities on metal surfaces. Stripe candidates are discriminated by projecting linearly polarized laser light onto the objects, and measuring the polarization state of the reflected light at each pixel of the various candidates. We sketch a model for predicting the polarization state of the true stripe, and report several experimental results.