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Close Range Calibration of Long Focal Length Lenses in a Changing Environment

Robson, S; MacDonald, L; Kyle, S; Shortis, MR; (2016) Close Range Calibration of Long Focal Length Lenses in a Changing Environment. In: Halounova, L and Šafář, V and Remondino, R and Hodač, H and Pavelka, P and Shortis, S and Rinaudo, R and Scaioni, S and Boehm, B and Rieke-Zapp, D, (eds.) Proceedings of 23rd Congress of the International Society for Photogrammetry and Remote Sensing (ISPRS). (pp. pp. 115-122). International Society for Photogrammetry and Remote Sensing (ISPRS): Prague, Czech Republic. Green open access

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Abstract

University College London is currently developing a large-scale multi-camera system for dimensional control tasks in manufacturing, including part machining, assembly and tracking, as part of the Light Controlled Factory project funded by the UK Engineering and Physical Science Research Council. In parallel, as part of the EU LUMINAR project funded by the European Association of National Metrology Institutes, refraction models of the atmosphere in factory environments are being developed with the intent of modelling and eliminating the effects of temperature and other variations. The accuracy requirements for both projects are extremely demanding, so accordingly improvements in the modelling of both camera imaging and the measurement environment are essential. At the junction of these two projects lies close range camera calibration. The accurate and reliable calibration of cameras across a realistic range of atmospheric conditions in the factory environment is vital in order to eliminate systematic errors. This paper demonstrates the challenge of experimentally isolating environmental effects at the level of a few tens of microns. Longer lines of sight promote the use and calibration of a near perfect perspective projection from a Kern 75mm lens with maximum radial distortion of the order of 0.5m. Coordination of a reference target array, representing a manufactured part, is achieved to better than 0.1mm at a standoff of 8m. More widely, results contribute to better sensor understanding, improved mathematical modelling of factory environments and more reliable coordination of targets to 0.1mm and better over large volumes.

Type: Proceedings paper
Title: Close Range Calibration of Long Focal Length Lenses in a Changing Environment
Event: 23rd Congress of the International Society for Photogrammetry and Remote Sensing (ISPRS)
Open access status: An open access version is available from UCL Discovery
DOI: 10.5194/isprs-archives-XLI-B5-115-2016
Publisher version: http://www.int-arch-photogramm-remote-sens-spatial...
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Keywords: Camera, calibration, close range, physical parameter, correlation, temperature, wavelength
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1505770
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