By Sebe N., Lew M.S., Huang T.S.

This ebook constitutes the refereed complaints of the foreign Workshop on Human-Computer interplay, HCI 2004, held at ECCV 2004 in Prague, Czech Republic in may perhaps 2004.The 19 revised complete papers provided including an introductory evaluate and an invited paper have been rigorously reviewed and chosen from forty five submissions. The papers are equipped in topical sections on human-robot interplay, gesture reputation and physique monitoring, structures, and face and head.

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Head and hands 3D tracking in real time by the EM algorithm”, Recognition, Analysis, and Tracking of Faces and Gestures in RealTime Systems, 2001. Proceedings. IEEE ICCV Workshop on, pp. 75-81, 13 July 2001 [3] R. Cutler, M. Turk. “View-based interpretation of real-time optical flow for gesture recognition”, Automatic Face and Gesture Recognition, 1998. Proceedings. Third IEEE International Conference on, pp. 416-421, 14-16 April 1998. [4] M. Ehreumann, T. Lutticke, R. Dillmann. “Dynamic gestures as an input device for directing a mobile platform ” Robotics and Automation, 2001.

The frames are first filtered using a Gaussian kernel to smooth out irrelevant variations and enhance large blobs. The gradients are computed simultaneously and the image is then divided in 16X16 pixels windows. The sum of the gradients magnitude is taken over each window and compared to a threshold. This allows processing only regions that have enough high frequency content and 42 Vincent Paquin and Paul Cohen Fig. 2. System Architecture speeding up later computations. Skin-coloured pixels are then localized in the blurred frames.

A. Smith. Gaze and speech in attentive user interfaces. Proceedings of the International Conference on Multimodal Interfaces, 2000. [2] B. Brumitt, J. Krumm, B. Meyers, and S. Shafer. Let There Be Light: Comparing Interfaces for Homes of the Future. IEEE Personal Communications, August 2000. [3] Anonymous. [4] C. Wren, A. Azarbayejani, T. Darrell, and A. Pentland. Pfinder: Real-Time Tracking of the Human Body. IEEE Transaction on Pattern Analysis and Machine Intelligence, Vol. 19, No. 7, 1997. [5] A.

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