Journal
IEEE SENSORS JOURNAL
Volume 19, Issue 3, Pages 1082-1090Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2018.2880194
Keywords
Support vector machine; sequential minimal optimization; gesture recognition; wearable intelligence; capacitance measurement
Funding
- EPSRC, U.K. [EP/R511705/1]
- Royal Society [RSG\ R1\ 180269]
- Scottish Research Partnership in Engineering - SRPe [PEER1718/03]
- University of Glasgow under the Glasgow Exchange Knowledge (GKE) Fund
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This paper presents an innovative wrist-worn device with machine learning capabilities and a wearable pressure sensor array. The device is used for monitoring different hand gestures by tracking tendon movements around the wrist. Thus, an array of PDMS-encapsulated capacitive pressure sensors is attached to the user to capture wrist movement. The sensors are embedded on a flexible substrate and their readout requires a reliable approach for measuring small changes in capacitance. This challenge was addressed by measuring the capacitance via the switched capacitor method. The values were processed using a programme on LabVIEW to visually reconstruct the gestures on a computer. In addition, to overcome limitations of tendo's uncertainty when the wristband is re-worn, or the user is changed, a calibration step based on the support vector machine (SVM) learning technique is implemented. Sequential minimal optimization algorithm is also applied in the system to generate SVM classifiers efficiently in real-time. The working principle and the performance of the SVM algorithms demonstrate through experiments. Three discriminated gestures have been clearly separated by SVM hyperplane and correctly classified with high accuracy (>90%) during real-time gesture recognition.
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