Fiber-optic fringe projection with crosstalk reduction by adaptive pattern masking

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dc.identifier.uri http://dx.doi.org/10.15488/1763
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/1788
dc.contributor.author Matthias, Steffen
dc.contributor.author Kästner, Markus
dc.contributor.author Reithmeier, Eduard
dc.date.accessioned 2017-08-08T11:41:47Z
dc.date.available 2017-08-08T11:41:47Z
dc.date.issued 2017
dc.identifier.citation Matthias, S.; Kästner, M.; Reithmeier, E.: Fiber-optic fringe projection with crosstalk reduction by adaptive pattern masking. In: Proceedings of SPIE - The International Society for Optical Engineering 10117 (2017), 101170A. DOI: https://doi.org/10.1117/12.2254826
dc.description.abstract To enable in-process inspection of industrial manufacturing processes, measuring devices need to fulfill time and space constraints, while also being robust to environmental conditions, such as high temperatures and electromagnetic fields. A new fringe projection profilometry system is being developed, which is capable of performing the inspection of filigree tool geometries, e.g. gearing elements with tip radii of 0.2 mm, inside forming machines of the sheet-bulk metal forming process. Compact gradient-index rod lenses with a diameter of 2 mm allow for a compact design of the sensor head, which is connected to a base unit via flexible high-resolution image fibers with a diameter of 1.7 mm. The base unit houses a flexible DMD based LED projector optimized for fiber coupling and a CMOS camera sensor. The system is capable of capturing up to 150 gray-scale patterns per second as well as high dynamic range images from multiple exposures. Owing to fiber crosstalk and light leakage in the image fiber, signal quality suffers especially when capturing 3-D data of technical surfaces with highly varying reflectance or surface angles. An algorithm is presented, which adaptively masks parts of the pattern to reduce these effects via multiple exposures. The masks for valid surface areas are automatically defined according to different parameters from an initial capture, such as intensity and surface gradient. In a second step, the masks are re-projected to projector coordinates using the mathematical model of the system. This approach is capable of reducing both inter-pixel crosstalk and inter-object reflections on concave objects while maintaining measurement durations of less than 5 s. eng
dc.description.sponsorship DFG/CRC/TR 73
dc.language.iso eng
dc.publisher Bellingham, WA : S P I E - International Society for Optical Engineering
dc.relation.ispartofseries Proceedings of SPIE 10117 (2017)
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject Fringe projection eng
dc.subject high dynamic range eng
dc.subject image bers eng
dc.subject inverse fringe projection eng
dc.subject Electromagnetic fields eng
dc.subject Fibers eng
dc.subject Metal forming eng
dc.subject Sheet metal eng
dc.subject Environmental conditions eng
dc.subject Fringe projection eng
dc.subject Fringe projection profilometry eng
dc.subject High dynamic range eng
dc.subject High dynamic range images eng
dc.subject image bers eng
dc.subject Industrial manufacturing process eng
dc.subject Sheet-Bulk Metal Forming eng
dc.subject Crosstalk eng
dc.subject.ddc 530 | Physik ger
dc.title Fiber-optic fringe projection with crosstalk reduction by adaptive pattern masking
dc.type article
dc.type conferenceObject
dc.type Text
dc.relation.issn 0277-786X
dc.relation.doi https://doi.org/10.1117/12.2254826
dc.bibliographicCitation.volume 10117
dc.bibliographicCitation.firstPage 101170A
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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