2 December 1993 Photogrammetric calibration for improved three-dimensional particle-tracking velocimetry (3D PTV)
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Photogrammetry, the measurement of three-dimensional object coordinates from stereo photographic images, is an essential element of 3D PTV. Ray tracing is the method that has been used traditionally, however it requires accurate knowledge of image distance, camera locations relative to the object field, and the size, shape, and refractive index of intervening elements such as apparatus windows. These parameters need not be known if one uses an optical transform and in situ photogrammetric calibration. the use of this technique significantly reduces the computational time required for 3D PTV and increases the accuracy of the measured velocity fields. This technique has been integrated with two others we have recently developed: one is 2D particle tracking using the concept of `path coherence', and the other is stereo matching based on 2D `particle tracks' rather than the particles themselves.
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J. C. Kent, J. C. Kent, Nizar Trigui, Nizar Trigui, W. C. Choi, W. C. Choi, Yann G. Guezennec, Yann G. Guezennec, R. S. Brodkey, R. S. Brodkey, } "Photogrammetric calibration for improved three-dimensional particle-tracking velocimetry (3D PTV)", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163725; https://doi.org/10.1117/12.163725

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