EOG-based method and apparatus for asynchronous character input

An input apparatus characterized in that:

• this apparatus comprises an electrode, an electro-oculogram acquisition module, a computer host and a display;
• the electrode is connected to the electro-oculogram acquisition module through a self-contained connecting wire, an electro-oculogram signal obtained by the electro-oculogram acquisition module is transmitted to the computer host through a common serial port, and the computer host is connected to the display through a common VGA cable;
• wherein the display is configured to display a virtual keyboard having a total of N keys on the display, the virtual keyboard is configured to flicker in rounds, and all N keys are configured to flicker randomly once in each round;
• wherein the electro-oculogram acquisition module is configured to acquire electro-oculogram signals of a user in real-time through the electrode when the user blinks after the flickering of a target key when spelling, capture electro-oculogram data within a time period following the flickering of a key from the acquired electro-oculogram signals, use said electro-oculogram data as an original feature vector of the flickering key, and generate N original feature vectors in each cycle;
• and
• wherein the computer host is configured to identify the N acquired original feature vectors and output a certain result from 0 to N through an electro-oculogram identification algorithm, wherein 0 indicates that a condition for character input is not met, and 1 to N correspond to the N keys on the virtual keyboard.