Assessment of camera models for use in planar velocimetry calibration |
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| Authors: | Christian E Willert |
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| Institution: | (1) Institute of Propulsion Technology, German Aerospace Center (DLR), 51170 Köln, Germany |
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| Abstract: | The performance of three implementations 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. |
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| Keywords: | Digital imaging Camera calibration Camera model Flow imaging Image transformation Doppler global velocimetry Stereo particle image velocimetry |
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