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. 2022 Apr 20;8:11. doi: 10.1038/s41526-022-00196-6

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Proximity-based particle tracking: the ellipsoidal particles are tracked by fitting an ellipse to the individual objects in the image. The trajectories are reconstructed by linking the positions of nearest neighbors in two successive images. If particles get lost in the procedure, their trajectories are interpolated. b Collision tracking: a snapshot of one collision event: following the trajectory tracking, collisions fitting with two-dimensional measurement are detected and analyzed. See supplementary videos collision1.avi and collision2.avi for complete events.