  Lecture notes are important for students to review and understand the key
points in the class. Unfortunately, the students often miss or lose part of the
lecture notes. In this paper, we design and implement an infrared sensor based
system, InfraNotes, to automatically record the notes on the board by sensing
and analyzing hand gestures of the lecturer. Compared with existing techniques,
our system does not require special accessories with lecturers such as
sensor-facilitated pens, writing surfaces or the video-taping infrastructure.
Instead, it only has an infrared-sensor module on the eraser holder of
black/white board to capture handwritten trajectories. With a lightweight
framework for handwritten trajectory processing, clear lecture notes can be
generated automatically. We evaluate the quality of lecture notes by three
standard character recognition techniques. The results indicate that InfraNotes
is a promising solution to create clear and complete lectures to promote the
education.
