Character input device based on eye tracking and P300 electrical potential of the brain electricity

Abstract

The invention relates to a character input device based on eye tracking and P300 electrical potential of the brain electricity, which comprises a video camera array, an eye tracking module, a keyboard module, a brain electricity signal analyzing module and a system control module. The device combines the high spatial resolution of the eye tracking and the high time resolution of the P300 electrical potential detection of the brain electricity, firstly, determines an area where the keyboard is according to visual lines of a user, and then controls random flickers of all character keys in the area, arouses the P300 electrical potential of the brain electricity of the user, determines the character keys which the user wants to select according to the generation time of the electrical potential and the visual line location, thus realizing the input operation of characters. The invention provides a new human-machine interaction technique which does not need manpower to be involved and is not affected by the noise of the environment for use.

Description

technical field [0001] The invention relates to a computer peripheral device for character input, in particular to a character input device which combines eye-tracking technology and electroencephalogram analysis technology. Background technique [0002] Human-computer interaction (Human-Computer Interaction, HCI) is a technology to study human-computer interaction and its research purpose is to use all possible information channels for human-computer communication and improve the naturalness and efficiency of interaction. Traditional character input is performed by manual operation of the keyboard, mouse or gestures. In order to free hands and realize character input independent of human hands, people have invented character input methods such as voice technology, eye tracking technology, and EEG potential detection technology. . The biggest limitation of voice technology is its susceptibility to background noise. The present invention is a character input technology comb...

AI Technical Summary

Problems solved by technology

[0004] In 2002, David J.C.McKay of the University of Cambridge and others developed a software that can be used to replace the standard keyboard layout of a computer --- Dasher. Instead of "spelling out" the word expected by the user, Dasher is more regarded as a word input method. Compared with a speller (speller) that completes character input through "spelling", the degree of freedom of its input results lower

Supporting more possible characters will inevitably prolong the average time for the user's expected character to be noticed by the speller to complete the process of determination, resulting in a decrease in the number of characters actually determined per unit time

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