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Proceedings Paper

Analysis of sub-pixel laser spot detection in laser triangulation systems
Author(s): Patrick Kienle; Elif Nallar; Michael H. Köhler; Martin Jakobi; Alexander W. Koch
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Paper Abstract

Laser spot detection is an important step of laser triangulation and limits its accuracy. Common methods to determine the center position include circle fitting, the Hough transformation, the gray centroid method or Gaussian fitting. As these algorithms were often tested in different set-ups and under various conditions, they generally lead to diverse results. The aim of this contribution is to investigate the algorithms in a more objective and realistic approach. After a short introduction to laser triangulation, basic information about laser spot center detection is given. Fundamental limitations of the laser spot detection are then considered and analyzed. The investigations are followed by evaluations of measurements in a real laser triangulation setup. Through this approach we could show that the influence of the spatial quantization and the quantization due to the limited bit depth of the detector can be in a similar range as the deviation due to speckle noise in the image. By using adapted image processing steps, the performance of the laser spot center determination could be improved significantly.

Paper Details

Date Published: 21 June 2019
PDF: 11 pages
Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 110563O (21 June 2019); doi: 10.1117/12.2525669
Show Author Affiliations
Patrick Kienle, Technische Univ. München (Germany)
Elif Nallar, Technische Univ. München (Germany)
Michael H. Köhler, Technische Univ. München (Germany)
Martin Jakobi, Technische Univ. München (Germany)
Alexander W. Koch, Technische Univ. München (Germany)

Published in SPIE Proceedings Vol. 11056:
Optical Measurement Systems for Industrial Inspection XI
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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