Improved defect segmentation by combining fiber optic fringe projection profilometry with directional variable brightfield illumination

Lennart Hinz; Markus Kästner; Eduard Reithmeier

doi:10.1117/12.2578564

5 March 2021 Improved defect segmentation by combining fiber optic fringe projection profilometry with directional variable brightfield illumination

Lennart Hinz, Markus Kästner, Eduard Reithmeier

Author Affiliations +

Proceedings Volume 11698, Emerging Digital Micromirror Device Based Systems and Applications XIII; 116980S (2021) https://doi.org/10.1117/12.2578564
Event: SPIE OPTO, 2021, Online Only

Abstract

Based the fringe projection profilometry, a compact and flexible positionable measuring head can be combined with optical fiber bundles to perform in-situ inspection tasks in industrial applications. Surfaces of complex geometries can be reconstructed and quantified in metric coordinates by means of a fast, non-contact and high-resolution measurement. Defect segmentation, on the other hand, is rather complex with three-dimensional point clouds, since reference data is required or a deviation determination is ambiguous and susceptible to errors. Due to each reconstructed object point corresponding to a camera pixel, it is possible to apply image processing algorithms or neural networks for defect segmentation. Since image based segmentation is more susceptible to poor illumination and deviating surface curvature or texture, a circular array of miniature LEDs has been coaxially arranged around the imaging optics of the camera’s fiber to provide different illumination directions. By utilizing a directional variable illumination sequence, the advantages of image-based segmentation can be combined with the unambiguousness and metric quantifiability of point cloud data.

Conference Presentation

Citation Download Citation

Lennart Hinz, Markus Kästner, and Eduard Reithmeier "Improved defect segmentation by combining fiber optic fringe projection profilometry with directional variable brightfield illumination", Proc. SPIE 11698, Emerging Digital Micromirror Device Based Systems and Applications XIII, 116980S (5 March 2021); https://doi.org/10.1117/12.2578564

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