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UBC Theses and Dissertations

Video annotations in helping locate in-video information for revisitation Min, Li


Rewatching video segments is common in video-based learning, and video segments of interest need to be located first for this rewatching. However, learners are not well supported in the process of locating in-video information. To fill this gap, the presented work explores whether video annotations are effective in helping learners locate previously seen in-video information. A novel interface design consisting of two components for learning with videos is proposed and tested in the task of locating in-video information: an annotating mechanism based on an integration of text with video, and an annotation manager which enables the learner to see all annotations he/she has made on a video and provides quick access to video segments. A controlled lab experiment with 16 undergraduate students as subjects was carried out. Experiment results suggested that the use of video annotations significantly reduced time spent on searching for previously seen video segments by about 5 seconds (p < 0.05), and subjects spontaneously used the proposed annotation manager 3 times more often in the information-seeking process than the traditional method of finding video segments by sliding through the video timeline (9:3). Qualitative data from surveys and interviews indicated that both the annotation process and annotations on the proposed interface were perceived as helpful for learning with videos. Thus, video annotations in the proposed interface are effective in reducing search time for in-video information; the annotation process, annotations created by the learner, and the proposed annotation manager play important roles in the information-seeking process.

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Attribution-NonCommercial-NoDerivatives 4.0 International