Development and Evaluation of a Keyword-Accessible Lecture Video Player

absTracT It is desirable to build up a lecture video library to enable students to view past lectures at any time and from anywhere on their PCs. For this purpose, we developed a lecture video player/maker system (Yoshida, 2002, 2003). In developing this system, we considered the usability for students and oper-ability for teachers. The player includes a keyword access function, which enables the student to jump to scenes where one of the registered keywords was spoken. For this purpose, the lecture video maker realizes automatic index generation after continuous speech recognition of the whole lecture stream. In this paper, we discuss the structure and the functions of an ideal lecture video player, and the importance of the index corresponding to the scenes in which the related keywords are spoken. We will also present experimental results regarding keyword extraction from three lecture streams. Evaluations of the lecture videos and the player by students are discussed, and the desirable style of lecture videos for students is surveyed.