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Sensors 2015, 15(1), 394-407; doi:10.3390/s150100394

A Real-Time Pinch-to-Zoom Motion Detection by Means of a Surface EMG-Based Human-Computer Interface

1
Department of Medical System Engineering (DMSE), Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea
2
School of Mechatronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea
*
Author to whom correspondence should be addressed.
Received: 12 October 2014 / Accepted: 10 December 2014 / Published: 29 December 2014
(This article belongs to the Special Issue HCI In Smart Environments)
View Full-Text   |   Download PDF [2488 KB, uploaded 29 December 2014]   |  

Abstract

In this paper, we propose a system for inferring the pinch-to-zoom gesture using surface EMG (Electromyography) signals in real time. Pinch-to-zoom, which is a common gesture in smart devices such as an iPhone or an Android phone, is used to control the size of images or web pages according to the distance between the thumb and index finger. To infer the finger motion, we recorded EMG signals obtained from the first dorsal interosseous muscle, which is highly related to the pinch-to-zoom gesture, and used a support vector machine for classification between four finger motion distances. The powers which are estimated by Welch’s method were used as feature vectors. In order to solve the multiclass classification problem, we applied a one-versus-one strategy, since a support vector machine is basically a binary classifier. As a result, our system yields 93.38% classification accuracy averaged over six subjects. The classification accuracy was estimated using 10-fold cross validation. Through our system, we expect to not only develop practical prosthetic devices but to also construct a novel user experience (UX) for smart devices. View Full-Text
Keywords: surface EMG; pinch-to-zoom; finger gesture recognition; machine learning; support vector machine; multi-class classification surface EMG; pinch-to-zoom; finger gesture recognition; machine learning; support vector machine; multi-class classification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, J.; Cho, D.; Lee, K.J.; Lee, B. A Real-Time Pinch-to-Zoom Motion Detection by Means of a Surface EMG-Based Human-Computer Interface. Sensors 2015, 15, 394-407.

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