Polarization-based peak detection in laser triangulation-range sensors

Jim Clark, Emanuele Trucco

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Number of pages12
Publication statusPublished - 1996
EventThree-Dimensional and Unconventional Imaging for Industrial Inspection and Metrology - Philadelphia, PA, USA
Duration: 23 Oct 199525 Oct 1995


ConferenceThree-Dimensional and Unconventional Imaging for Industrial Inspection and Metrology
CityPhiladelphia, PA, USA


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