Abstract：A portable intelligent speller system based on blink electrooculogram (EOG) was designed to help patients of limb movement function disorders to communicate with other people. The user can control virtual keyboard to spell characters by blinking on human-computer interaction (HCI) interface. The signal would be pre-processed by acquisition module of the system. Then the signal was converted to digital signal, and the digital signal was transmitted to microprocessor. Pike noise of the digital signal was firstly filtered by mathematical morphology. Then dynamical threshold algorithm and normalization, differential algorithm were used to detect the blink. According to the information of EOG, virtual keyboard was controlled to spell characters by microprocessor. In this paper, 12 subjects were tested the system in three occasions (routine laboratory, magnetic resonance imaging equipment room with the large electromagnetic interference, and outdoor playground). Results showed that the system could accurately identify blink signal and spell characters including Chinese, English and numbers. Besides, the mean average precision of input character was above 98%. The average input speeds of Chinese character, English character and number were 2.8±0.3, 6.6±0.35 and 9.7±0.38 (per/min), respectively. Hence the system which has higher interference rejection is appropriate for patient of limb movement function disorders.
郜东瑞 甘玉龙 李鹏霄 谢佳欣 尧德中 刘铁军#*. 基于眼电的智能输入系统研究[J]. 中国生物医学工程学报, 2015, 34(6): 662-669.
Gao Dongrui GanYulong Li Pengxiao Xie Jiaxin Yao Dezhong Liu Tiejun#* . Research of Intelligent Speller System Based on EOG. journal1, 2015, 34(6): 662-669.
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