Dot tracking methodology for background-oriented schlieren
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Dot tracking methodology for background-oriented schlieren

Background-Oriented Schlieren (BOS) is used to measure fluid density from the apparent distortion of a target dot pattern. Here, we propose a new displacement estimation methodology based on tracking individual dots on the pattern as opposed to conventional cross-correlation algorithms. As dot patterns used in BOS are user-made, the prior information about the dot location, size, and density can be used to improve the dot identification procedure even in the presence of noise. Finally, a correction procedure is used at the final step to improve the dynamic range of the sub-pixel displacement estimation. This new method provides order of magnitude improvements in accuracy, precision, spatial resolution, and dynamic range.

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