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. 2019 Dec 3;18:115. doi: 10.1186/s12938-019-0735-1

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© The Author(s) 2019

Open AccessThis 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 — Graphs of values of the error $δ_{k}$ for the individual methods: Sobel (blue), Roberts (black), Canny (red) and the authors’ method (green) of outer corneal edge detection, for each of the 15,400 analysed images