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. 2019 Aug 26;19(17):3702. doi: 10.3390/s19173702

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Figure A2 — Tracking results for frames 1, 63, 126, 189, 252, and 315 for the PCE 25 (optical video) case. The vehicle is SUV. No detections are observed in the sampled frames. (a) 1000 m; (b) 2000 m; (c) 2500 m; and (d) 3500 m.