Open Access

Anthropocentric Video Segmentation for Lecture Webcasts

EURASIP Journal on Image and Video Processing20072008:195743

DOI: 10.1155/2008/195743

Received: 31 January 2007

Accepted: 12 December 2007

Published: 12 December 2007


Many lecture recording and presentation systems transmit slides or chalkboard content along with a small video of the instructor. As a result, two areas of the screen are competing for the viewer's attention, causing the widely known split-attention effect. Face and body gestures, such as pointing, do not appear in the context of the slides or the board. To eliminate this problem, this article proposes to extract the lecturer from the video stream and paste his or her image onto the board or slide image. As a result, the lecturer acting in front of the board or slides becomes the center of attention. The entire lecture presentation becomes more human-centered. This article presents both an analysis of the underlying psychological problems and an explanation of signal processing techniques that are applied in a concrete system. The presented algorithm is able to extract and overlay the lecturer online and in real time at full video resolution.

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Authors’ Affiliations

International Computer Science Institute
Institut für Informatik, Freie Universität Berlin


© G. Friedland and R. Rojas. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.