title: A real-time pinch-to-zoom motion detection by means of a surface EMG-based human-computer interface.
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.
authors.affiliation: Department of Medical System Engineering (DMSE), Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea. kimji@gist.ac.kr.
authors.forename: Jongin
authors.initials: J
authors.lastname: Kim
authors.affiliation: School of Mechatronics, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea. dongrae16@gist.ac.kr.
authors.forename: Dongrae
authors.initials: D
authors.lastname: Cho
authors.affiliation: Department of Medical System Engineering (DMSE), Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea. lightjin619@gist.ac.kr.
authors.forename: Kwang Jin
authors.initials: KJ
authors.lastname: Lee
authors.affiliation: Department of Medical System Engineering (DMSE), Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea. leebr@gist.ac.kr.
authors.forename: Boreom
authors.initials: B
authors.lastname: Lee
mesh_terms: D000328:Adult; D000465:Algorithms; D004576:Electromyography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D009038:Motion; D010363:Pattern Recognition, Automated; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014584:User-Computer Interface