title: Bite weight prediction from acoustic recognition of chewing.
abstract: Automatic dietary monitoring (ADM) offers new perspectives to reduce the self-reporting burden for participants in diet coaching programs. This paper presents an approach to predict weight of individual bites taken. We utilize a pattern recognition procedure to spot chewing cycles and food type in continuous data from an ear-pad chewing sound sensor. The recognized information is used to predict bite weight. We present our recognition procedure and demonstrate its operation on a set of three selected foods of different bite weights. Our evaluation is based on chewing sensor data of eight healthy study participants performing 504 habitual bites in total. The sound-based chewing recognition achieved recalls of 80% at 60%-70% precision. Food classification of chewing sequences resulted in an average accuracy of 94%. In total, 50 variables were derived from the chewing microstructure, and were analyzed for correlations between chewing behavior and bite weight. A subset of four variables was selected to predict bite weight using linear food-specific models. Mean weight prediction error was lowest for apples (19.4%) and largest for lettuce (31%) using the sound-based recognition. We conclude that bite weight prediction using acoustic chewing recordings is a feasible approach for solid foods, and should be further investigated.
authors.affiliation: Signal Processing Systems, Technische Universiteit Eindhoven, NL-5600 MB Eindhoven, The Netherlands. amft@ieee.org
authors.forename: Oliver
authors.initials: O
authors.lastname: Amft
authors.forename: Martin
authors.initials: M
authors.lastname: Kusserow
authors.forename: Gerhard
authors.initials: G
authors.lastname: Tröster
mesh_terms: D000162:Acoustics; D000328:Adult; D000465:Algorithms; D004576:Electromyography; D005247:Feeding Behavior / Q000502:physiology; D005260:Female; D005502:Food; D006801:Humans; D008297:Male; D008409:Mastication / Q000502:physiology*; D018670:Monitoring, Ambulatory / Q000379:methods; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D018709:Statistics, Nonparametric