Magnetically marked tongue machine interface-based spatial track plane projection text identification method

Abstract

The invention relates to a magnetically marked tongue machine interface-based spatial track plane projection text identification method, and aims to realize that a patient with limb function loss performs typewriting through a computer. The method comprises the steps of constructing a spatial magnetic field by utilizing a permanent magnet as a marker and marking a motion of a tongue tip; establishing a global xyz rectangular coordinate system, measuring a distribution situation of the spatial magnetic field derived by the marking permanent magnet through a magnetic field detection sensor witha fixed position outside an oral cavity, and in combination with a reverse solving algorithm, obtaining a distance between the marking permanent magnet and the magnetic field detection sensor; based on the spatial distribution position of the magnetic field detection sensor, obtaining the spatial distribution position of the marking permanent magnet, thereby obtaining a motion track of the tonguetip; and based on a curvature judgment criterion, performing feature identification on the obtained motion track of the magnetically marked tongue tip, and outputting identified letters. The method can provide an efficient and accurate man-machine interaction means taking the tongue tip as a writing tool for the patient with the limb function loss.

Description

technical field [0001] The invention relates to a method, in particular to a space trace plane projection text recognition method based on a magnetic marker tongue-machine interface. Background technique [0002] For severely paralyzed patients, since they have almost lost the motor function of their limbs, such severely disabled patients urgently need to use new interactive methods to communicate with the external environment, including daily needs, communication with relatives, doctor-patient communication, entertainment, etc. , which is of great significance to the physical and mental health of patients. Using the patient's retained tongue motor function, an interactive technique based on a tongue-machine interface was described as an effective and feasible method. The tongue machine interface technology based on permanent magnet magnetic marker has the advantages of simple structure, non-contact, no excitation source, and transmission not affected by human tissue, etc.,...

AI Technical Summary

Problems solved by technology

However, due to the narrow space in the oral cavity, the operation process is not intuitive, the trajectory of the tip of the tongue is easy to alias, and there are great difficulties in the recognition of spatial text trajectories.

Images