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. 2020 Jul 17;17:99. doi: 10.1186/s12984-020-00726-x

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Sensor comparison. Different sensors used within the retrieved publications were divided into the three categories: Distance & depth, Kinematic and Other. Update rate describes the number of measurements per second. The rating scale: (low), (medium) and (high) is used instead of absolute values, representing a scale from approximately 10 Hz up to 100 Hz for real-time applications. The smallest change that can still be detected by a sensor is its Resolution. The rating scale: (low), (medium) and (high) is used instead of absolute values, representing a scale from several centimeters down to the millimeter range. Unobstructed field of view indicates whether the sensor functionality does or does not require an unobstructed field of view: (yes/no). If its not applicable, this is indicated by: (n/a)