Teacher Attention Analysis Method Based on Face Three-Dimensional Feature Point Coordinate Transformation and Viewpoint Visualization and Applications
Bing Gong · Proceedings of the 2022 3rd International Conference on Big Data and Informatization Education (ICBDIE 2022) · 2022
In the process of quantitative analysis of classroom teaching, it is often necessary to evaluate individual indicators related to attention such as "whether teachers' teaching attracts students, whether they stimulate learning enthusiasm" and "whether there is eye contact between teachers and students".The teacher's attention to the students reflects the teacher's teaching state and teaching psychology, and meets the requirements of observability, repeatability and interpretability of quantitative analysis of the classroom teaching process.In this paper, the method of mutual conversion and mapping between natural coordinates and classroom coordinates is used to project the face normal of the student's nose tip to the teacher's teaching video shot by the rear camera.The intersection of the rays in the classroom coordinate system on the camera plane must be calculated first, and then calculate the mapping point coordinates of the intersection in the teacher coordinate system.Finally, the viewpoint visualization in classroom teaching is realized.