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. 2018 Jan 29;17:13. doi: 10.1186/s12938-018-0441-4

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© The Author(s) 2018

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. 2 — Outputs obtained at preprocessing stage of the proposed method. a Raw ECG signal from record 200 in the MIT-BIH-AR database; b signal obtained by difference operation; c signal obtained by averaging operation; d signal obtained by averaging operation followed by difference operation