A Novel Chewing Detection System Based on PPG, Audio, and Accelerometry
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van den Boer, Janet
In the context of dietary management, accurate monitoring of eating habits is receiving increased attention. Wearable sensors, combined with the connectivity and processing of modern smart phones, can be used to robustly extract objective, and real-time measurements of human behaviour. In particular, for the task of chewing detection, several approaches based on an in-ear microphone can be found in the literature, while other types of sensors have also been reported, such as strain sensors. In this work, performed in the context of the SPLENDID project, we propose to combine an in-ear microphone with a photoplethysmography (PPG) sensor placed in the ear concha, in a new high accuracy and low sampling rate prototype chewing detection system. We propose a pipeline that initially processes each sensor signal separately, and then fuses both to perform the ?nal detection. Features are extracted from each modality, and support vector machine (SVM) classi?ers are used separately to perform snacking detection.
IEEE Journal of Biomedical and Health Informatics, vol. 21 (3), pp. 607-618