Natural writing character input method and system based on visual brain-computer interface

Abstract

The present invention provides a natural writing character input method and system based on a visual brain-computer interface. 9 cicular visual stimuli are presented on a computer screen and are arranged in a 3x3 matrix; a character is written by drawing lines among 6 stimulus circles on the left; and character input is controlled by using 3 stimulus circles on the right. The system comprises a visual stimulator, a brain-computer acquisition platform, a PC real-time processing system and a character input interface. The visual stimulator is used for generating visual stimuli at different frequencies; the brain-computer acquisition platform is used for acquiring a brain-computer signal in real time and input the brain-computer signal subjected to amplification, filtration and analog-digital conversion into the PC computer; the PC real-time processing system is used for performing real-time processing on the received brain-computer signal, detecting a SSVEP signal frequency and a corresponding stimulus circle, and transferring a command represented thereby to the character input interface; and the character input interface performs corresponding processing according to a type of the command, and trasmits a to-be-input character to a text area for display. The system provided by the present invention is natural for input, high in accuracy, excellent in robustness and does not need to be trained by users.

Description

technical field [0001] The present invention relates to brain science technology and computer technology, more specifically, the present invention relates to brain-computer interface technology and character input technology. Background technique [0002] The human brain communicates with the outside world or controls the external environment through neuromuscular channels, and many diseases can destroy these neuromuscular channels. For example, amyotrophic lateral sclerosis, brainstem stroke, spinal cord injury, cerebral palsy, Parkinson's, multiple sclerosis, and many others can damage the nerve pathways that control muscles or damage the muscles themselves. Those severely affected by these disorders may lose voluntary muscle control, resulting in motor dysfunction that prevents them from communicating with the outside world or controlling external devices. [0003] Brain-Computer Interface (BCI) monitors the user's brain activity, interprets the user's intention, and con...

AI Technical Summary

Problems solved by technology

However, the BCI based on the P300 potential has two inherent disadvantages: one is that when the number of characters to be input is large, it takes a long time to input a character, resulting in a low character input speed; the other is the lack of time and user interaction. Robustness between, resulting in low character input accuracy

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