Abstract
This paper presents direct comparisons between the physics-based optical flow and well-established cross-correlation methods for extraction of velocity fields from particle images. The accuracy and limitations of the optical flow method applied to particle image velocimetry are critically evaluated. After a brief review of the optical flow method, we discuss in detail the error estimates, relevant parameters to the accuracy of optical flow computation, and mathematical connection between the optical flow and the particle velocity. Quantitative evaluations of both the optical flow and correlation methods are made through simulations and physical flow measurements.
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