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Calibration of focus-adjustable cameras for triangulation sensors by model-based camera parameter estimation

Authors
  • Bossemeyer, Hagen
  • Ahlborn, Patrick
  • Kästner, Markus
  • Reithmeier, Eduard
Type
Published Article
Journal
tm - Technisches Messen
Publisher
De Gruyter Oldenbourg
Publication Date
Apr 21, 2022
Volume
89
Issue
6
Pages
455–462
Identifiers
DOI: 10.1515/teme-2022-0023
Source
De Gruyter
Keywords
Disciplines
  • Beiträge
License
Yellow

Abstract

The working range of triangulation-based measuring systems is often limited by the depth of field of the applied optical system. Approaches such as increasing the depth of field range by reducing the aperture are limited in their effectiveness by a lower light yield and thus require a longer exposure time. Focus adjustable optics enable the depth of field to be modified and thus effect the location and shape of the working range. However, the validity of the model-based camera calibration is limited to the corresponding focus setting, especially with optics that exhibit the effect of focus breathing, i. e. whose focal length change with the focus setting. This paper presents an approach to model the calibration parameters over the entire focus range of a lens using function fitting of the camera parameters and the influence of different configurations on this process is examined.

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