Retrieval and Timing Performance of Chewing-Based Eating Event Detection in Wearable Sensors

Language
en
Document Type
Article
Issue Date
2020-03-11
First published
2020-01-20
Issue Year
2020
Authors
Zhang, Rui
Amft, Oliver
Editor
Publisher
MDPI
Abstract

We present an eating detection algorithm for wearable sensors based on first detecting chewing cycles and subsequently estimating eating phases. We term the corresponding algorithm class as a bottom-up approach. We evaluated the algorithm using electromyographic (EMG) recordings from diet-monitoring eyeglasses in free-living and compared the bottom-up approach against two top-down algorithms. We show that the F1 score was no longer the primary relevant evaluation metric when retrieval rates exceeded approx. 90%. Instead, detection timing errors provided more important insight into detection performance. In 122 hours of free-living EMG data from 10 participants, a total of 44 eating occasions were detected, with a maximum F1 score of 99.2%. Average detection timing errors of the bottom-up algorithm were 2.4 ± 0.4 s and 4.3 ± 0.4 s for the start and end of eating occasions, respectively. Our bottom-up algorithm has the potential to work with different wearable sensors that provide chewing cycle data. We suggest that the research community report timing errors (e.g., using the metrics described in this work).

Journal Title
Sensors
Volume
20
Issue
2
Citation
Sensors 20.2 (2020): 557. <https://www.mdpi.com/1424-8220/20/2/557>
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