Classroom teacher behavior spatiotemporal feature fusion tracking method

By locking the alias frequency of the classroom environment and performing fractional delay phase equalization, the problem of decreased eye tracking accuracy caused by interference from the projection light source and indoor lighting was solved, enabling stable monitoring of the teacher's eye trajectory and accurate analysis of teaching behavior.

CN121305689BActive Publication Date: 2026-03-31上海思来氏信息咨询有限公司
2 Cites 0 Cited by

Patent Information

Application Number
CN202511834140.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-08
Publication Date
2026-03-31
Estimated Expiration
2045-12-08

AI Technical Summary

Technical Problem

In a real classroom environment, the specular reflection and periodic light intensity changes produced by the projection light source and indoor lighting on the whiteboard or interactive whiteboard surface lead to a decrease in eye tracking accuracy. The teacher's eye trajectory oscillates periodically, affecting the spatial positioning accuracy of teaching behavior and the reliability of teaching analysis models based on eye data.

Method used

By acquiring the pupil-corneal reflection difference signal of the teacher's eye movement, locking the alias frequency of the classroom environment lighting modulation frequency and the eye movement sampling rate, calculating the whiteboard glare coefficient and performing fractional delay phase equalization, generating a de-twisting vector, and solving the coordinates of the teacher's gaze point on the whiteboard plane, stable monitoring of the teacher's blackboard writing behavior is achieved.

Benefits of technology

It effectively overcomes optical interference, ensures the stability and accuracy of teachers' eye trajectory, and improves the reliability of eye tracking and the credibility of teaching behavior analysis in classroom scenarios.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application relates to the technical field of line-of-sight tracking and discloses a classroom teacher behavior space-time feature fusion tracking method, which comprises the following steps: acquiring a pupil corneal reflection difference signal of teacher eye movement, locking an alias frequency according to aliasing relationship between a classroom lighting modulation frequency and an eye movement sampling rate; calculating a whiteboard glare coefficient of the signal at the frequency, quantifying phase distortion generated by whiteboard mirror reflection, lighting stroboscopic and rolling shutter coupling; analyzing the coefficient into an effective time dislocation between axes, implementing fractional delay phase equalization on an image line scanning axis component of the signal, generating a deskewing vector, and finally calculating a gaze point on a whiteboard plane based on the vector. The application can accurately remove classroom-specific optical-sampling composite noise, effectively suppress abnormal jitter of the line-of-sight signal, and significantly improve the positioning accuracy and stability of teacher board writing behavior monitoring.
Need to check novelty before this filing date? Find Prior Art