Summarization of Video - taped Presentations : Automatic Analysis of Motion

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. XX, NO. Y, SEPTEMBER 1998 Summarization of Video-taped Presentations: Automatic Analysis of Motion and Gesture Shanon X. Ju, Michael J. Black, Scott Minneman, Don Kimber Abstract| This paper presents an automatic system for analyzing and annotating video sequences of technical talks. Our method uses a robust motion estimation technique to detect key frames and segment the video sequence into subsequences containing a single overhead slide. The subsequences are stabilized to remove motion that occurs when the speaker adjusts their slides. Any changes remaining between frames in the stabilized sequences may be due to speaker gestures such as pointing or writing and we use active contours to automatically track these potential gestures. Given the constrained domain we de ne a simple set of actions that can be recognized based on the active contour shape and motion. The recognized actions provide an annotation of the sequence that can be used to access a condensed version of the talk from a web page. Keywords|Automatic Video Annotation, Video Summarization, Robust Motion Estimation, Keyframe Detection, Gesture Tracking and Recognition.