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Lecture notes are important for students to review and understand the keypoints in the class. Unfortunately, the students often miss or lose part of thelecture notes. In this paper, we design and implement an infrared sensor basedsystem, InfraNotes, to automatically record the notes on the board by sensingand analyzing hand gestures of the lecturer. Compared with existing techniques,our system does not require special accessories with lecturers such assensor-facilitated pens, writing surfaces or the video-taping infrastructure.Instead, it only has an infrared-sensor module on the eraser holder ofblack/white board to capture handwritten trajectories. With a lightweightframework for handwritten trajectory processing, clear lecture notes can begenerated automatically. We evaluate the quality of lecture notes by threestandard character recognition techniques. The results indicate that InfraNotesis a promising solution to create clear and complete lectures to promote theeducation.

InfraNotes: Inconspicuous Handwritten Trajectory Tracking for Lecture Note Recording with Infrared Sensors