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Wearable handwriting input device using magnetic field: Geomagnetism cancellation in position calculation |
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| Authors: | Xinying Han Hiroaki Seki Yoshitsugu Kamiya Masatoshi Hikizu |
| Affiliation: | 1. Claudius Regaud Comprehensive Cancer Center, Department of Surgical Oncology, Toulouse, France;2. Claudius Regaud Comprehensive Cancer Center, Department of Biostatistics, Toulouse, France;3. Claudius Regaud Comprehensive Cancer Center, Department of Pathology, Toulouse, France;4. McGill University, Montreal, Canada;1. Center Laboratory, The First Hospital of Nanchang City, 330008 Nanchang, PR China;2. Department of Radiology, The Third Affiliated Hospital of Nanchang University, 330008 Nanchang, PR China;3. Department of Radiology, University of Cambridge, CB2 0QQ Cambridge, UK;4. Academy for Advanced Interdisciplinary Studies, Peking University, 100871 Beijing, PR China;5. Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, 100029 Beijing, PR China;6. College of Engineering, Peking University, 100871 Beijing, PR China |
| Abstract: | In this paper an efficient technique using magnetic field is proposed for wearable handwriting input. This device requires mounting a permanent magnet onto fingertip and detecting the magnetic field generated by the magnet through magnetic sensors at the wrist of the other hand. The position of magnet is calculated by the vector of the magnetic field. And a method is proposed to avoid geomagnetic influence, using two magnetic sensors. Numerical methods are used to calculate the position of magnet with geomagnetism cancellation. Two numerical methods have been adopted and compared. A prototype device is made and we succeeded to get the trajectory of handwriting input character. |
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