Text Recognition Method of Spatial Trajectory Plane Projection Based on Magnetic Marking Tongue Machine Interface

Abstract

The invention relates to a spatial trace plane projection text recognition method based on a magnetic marker tongue machine interface, so as to realize typing by a computer for patients with loss of limb function. Use permanent magnets as markers to construct a spatial magnetic field to mark the movement of the tip of the tongue; establish a global xyz rectangular coordinate system, measure the distribution of the spatial magnetic field derived from the marked permanent magnet through a magnetic field detection sensor with a fixed position outside the oral cavity, and combine the reverse algorithm , to obtain the distance between the marked permanent magnet and the magnetic field detection sensor; based on the spatial distribution position of the magnetic field detection sensor, the spatial distribution position of the marked permanent magnet is obtained, thereby obtaining the trajectory of the tip of the tongue; The trajectory performs feature recognition and outputs the recognized letters. This method can provide an efficient and accurate means of human-computer interaction using the tip of the tongue as a writing tool for patients with loss of limb function.

Description

technical field [0001] The invention relates to an intelligent human-computer interaction technology, in particular to a space trajectory 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...

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.

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