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Virtual projective shape matching in targetless CAD-based close-range photogrammetry for efficient estimation of specific deviations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-7566-3656
Viospatia AB.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2018 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 57, no 5, article id 053110Article in journal (Refereed) Published
Abstract [en]

A concept for targetless, computer-aided design (CAD)-based, close-range photogrammetry for online shape inspection is introduced. The shape of an object, which is arbitrarily located on a conveyor belt, is to be measured and compared with its nominal shape as defined by a CAD model. For most manufactured objects, deviations are only measured at a few given comparison points. These deviations can be estimated using local photogrammetry based on a priori geometrical information given by the CAD model and the comparison points. Our method results in faster output with higher precision, because we do not generate a shape representation of the entire measured object using typical photogrammetric methods. Images depicting the object from convergent angles are captured by an array of cameras in a precalibrated network, and the CAD model is matched and aligned, within the projective geometry of the camera network, to the depicted object in the images without the use of targets. An algorithm for solving this virtual projective targetless shape matching problem is presented.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2018. Vol. 57, no 5, article id 053110
Keywords [en]
computer-aided design, close-range, matching, online, photogrammetry, shape
National Category
Reliability and Maintenance Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-68856DOI: 10.1117/1.OE.57.5.053110ISI: 000435435300019Scopus ID: 2-s2.0-85047752202OAI: oai:DiVA.org:ltu-68856DiVA, id: diva2:1209384
Projects
SIVPRO
Note

Validerad;2018;Nivå 2;2018-05-28 (andbra)

Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-07-26Bibliographically approved

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Publisher's full textScopushttp://dx.doi.org/10.1117/1.OE.57.5.053110

Authority records BETA

Bergström, PerSjödahl, Mikael

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