We propose a captioning system with a function of inserting mathematical formula images. [We match/The system matches?] mathematical formulas presented orally during a lecture with those simultaneously projected on a screen in the lecture room. We then manually extract the mathematical formula images from the screen for displaying on the monitor of the system. A captionist can input mathematical formulas by pressing a corresponding function key. This is much easier than inputting mathematical formulas by typing. We conducted an experiment in which participants evaluated the usefulness of the proposed captioning system. Experimental results showed that 14 of the 22 participants could input more sentences when using the function of inserting mathematical formula images than when not using it. Furthermore, from the results of a questionnaire, we could confirm that the proposed system is effective.
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