In order to analyze check the class individually by making our rounds in the classroom quantitatively, it is necessary to develop a system that replaces the existing analysis method of visual video recording. The purpose of this study is to develop a system that records the trajectory of a teacher using a two-dimensional sensor. The position of a teather is measured from the point cloud data output by the sensor, and after background subtraction, the point cloud data is calculated by grouping the student's point clouds. Experiments were conducted to examine the validity of the position measurement method used.
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