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Assessment of camera models for use in planar velocimetry calibration

Willert, Christian (2006) Assessment of camera models for use in planar velocimetry calibration. PIVNET2 Workshop on latest application and development of particle sizing techniques in conjunction with PIV, 2006-04-10 - 2006-04-11, Capua, Italy.

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Abstract

The performance of pinhole-based camera models for use in common light-sheet imaging arrangements is investigated on the background of application to particle image velocimetry (PIV) and Doppler global velocimetry (DGV). Calibration data obtained from translated planar calibration targets was found to yield camera attitude within 0.1° on four different test cases with object distance varying as little as 2% depending on the choice of camera model. Camera calibration using data from a single image of coplanar points is considered a viable alternative to manual triangulation of camera positions but is restricted to off-normal viewing directions. Also the influence of image mismatch and errors in viewpoint location on the reconstruction of 3-C PIV velocity data is demonstrated. It was found that the magnitude of residuals of the once-overdetermined system of equations are a viable measure of quality that is very sensitive to image geometry misalignment.

Document Type:Conference or Workshop Item (Speech)
Title:Assessment of camera models for use in planar velocimetry calibration
Authors:
AuthorsInstitution or Email of Authors
Willert, ChristianUNSPECIFIED
Date:April 2006
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:digital imaging, camera calibration, camera model, flow imaging, image transformation, Doppler global velocimetry, stereo particle image velocimetry
Event Title:PIVNET2 Workshop on latest application and development of particle sizing techniques in conjunction with PIV
Event Location:Capua, Italy
Event Type:international Conference
Event Dates:2006-04-10 - 2006-04-11
Organizer:Centro Italiano Ricerche Aerospatiali (CIRA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.phil. Christian Willert
Deposited On:03 May 2006
Last Modified:12 Dec 2013 20:19

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