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Supporting material for this study includes 3 videos and an algorithm code.
Files in this Data Supplement:
Top left: original video, cropped to the boundaries of the black metal sheet background (38 x 25 cm).
Top right: enhanced motion version, showing the improved contrast of moving particles.
Bottom left: final enhanced video (after threshold and particle shape filters were applied), showing particles (white) available for tracking.
Bottom right: demonstration of the vectors used to generate the flow measurement. Each frame shows a sequential pair of frames from the final enhanced video: 1st frame particles (red); 2nd frame particles (blue). Shown in white are vectors linking particles between the frames that contribute to the mean heading calculated for the frame pair (central white arrow). Green vectors are those of similar length but rejected by the particle tracking velocimetry algorithm. The overall mean heading for the 5 s video clip is shown by the blue central arrow. Some frames are blank because of duplicated frames that cannot be used for tracking particles.
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