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. 2020 Feb 28;17:36. doi: 10.1186/s12984-020-0640-7

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© The Author(s) 2020

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 4 — Two methods are proposed to fit the reference bands to the step of the subject. On the left: the resampling of the reference to the current duration of the step. And on the right: using dynamic time warping to adjust the reference to the joint angle of the current step. The second row shows the measured foot-to-ground angle of a subject () and the fitted reference bands (). The third row shows the resulting error with respect to the reference bands (). The problematic shift of the joint angle to the reference band obtained by the first method and the resulting error, is indicated (). The missing dorsiflexion of the subject during the swing-phase is consistent with the error obtained from the warped reference ()

Inline graphic — Two methods are proposed to fit the reference bands to the step of the subject. On the left: the resampling of the reference to the current duration of the step. And on the right: using dynamic time warping to adjust the reference to the joint angle of the current step. The second row shows the measured foot-to-ground angle of a subject () and the fitted reference bands (). The third row shows the resulting error with respect to the reference bands (). The problematic shift of the joint angle to the reference band obtained by the first method and the resulting error, is indicated (). The missing dorsiflexion of the subject during the swing-phase is consistent with the error obtained from the warped reference ()