Polarization-based peak detection in laser triangulation-range sensors

Jim Clark; Emanuele Trucco

doi:10.1117/12.230402

19 January 1996 Polarization-based peak detection in laser triangulation-range sensors

Jim Clark, Emanuele Trucco

Proceedings Volume 2599, Three-Dimensional and Unconventional Imaging for Industrial Inspection and Metrology; (1996) https://doi.org/10.1117/12.230402
Event: Photonics East '95, 1995, Philadelphia, PA, United States

Abstract

We report a polarization-based peak detection method for use in laser triangulation range sensors. Such sensors depend critically on the accurate detection of a pattern of laser light projected onto a scene, usually a point or line. Problems arise with highly specularly reflective surfaces, which can generate visible reflections of the light in various parts of the image. These can confuse intensity-based detection algorithms and lead to incorrect range measurements. This paper demonstrates the failure of intensity-based methods by reference to an existing triangulation scanner and sample depth data. A polarization-based method is proposed and we demonstrate experimentally the feasibility of polarization-based vision for disambiguating multiple specular inter-reflections of the laser light.

Citation Download Citation

Jim Clark and Emanuele Trucco "Polarization-based peak detection in laser triangulation-range sensors", Proc. SPIE 2599, Three-Dimensional and Unconventional Imaging for Industrial Inspection and Metrology, (19 January 1996); https://doi.org/10.1117/12.230402

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