Particle Image Velocimetry with Optical Flow

Abstract : An Optical Flow technique based on the use of Dynamic Programming has been applied to Particle Image Velocimetry yielding a significant increase in the accuracy and spatial resolution of the velocity field. Results are presented for calibrated synthetic sequences of images and for sequences of real images taken for a thermally driven flow of water with a freezing front. The accuracy remains better than 0.5 pixel/frame for tested two-image sequences and 0.2 pixel/frame for four-image sequences, even with a 10% added noise level and allowing 10% of particles to appear or disappear. A velocity vector is obtained for every pixel of the image.
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Georges Quénot, Jaroslaw Pakleza, Tomasz Kowalewski. Particle Image Velocimetry with Optical Flow. Experiments in Fluids, Springer Verlag (Germany), 1998, 25 (3), pp.177--189. ⟨10.1007/s003480050222⟩. ⟨hal-00953823⟩

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