Fig. 9: A graphical illustration of the image analysis process for the projection method on mode 2 (top) and mode 3 (bottom). | npj Microgravity

Fig. 9: A graphical illustration of the image analysis process for the projection method on mode 2 (top) and mode 3 (bottom).

From: Benchmarking surface tension measurement method using two oscillation modes in levitated liquid metals

Fig. 9

For each video frame, ImageJ software is used to convert the droplet’s shadow to an outline and subsequently convert the outline to polar coordinates. These polar coordinates are then projected onto the corresponding Legendre polynomial over the domain [0,2π] to find the projection amplitudes, an.

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