A Method of Extracting Difficult-to-Understand Video Intervals for Generating Assignments using Keywords in Online Lecture Videos

When preparing lecture videos, teachers must record the lesson video without student response. It makes it difficult for teachers to realize if their explanations are difficult for students to understand. It is also difficult for students watching the video to realize whether they are understanding the lesson video correctly because the lesson proceeds without any questions from the instructor. In this study, three factors are used to extract "difficult-to-understand" video intervals from the lesson videos and generate assignments for these video intervals to support students’ understanding. Students can check their understanding and seems to develop their knowledge by studying the assignments generated using our method. In this paper, we calculated some values for lesson videos on the Internet and suggested that our proposed method seems to work effectively.