1999

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  1. Herpers, R., Verghese, G., Chang, L., Darcourt, K., Derpanis, K., Enenkel, R., Kaufman, J., Jenkin, M., Milos, E., Jepson, A. and Tsotsos, J., An active stereo vision system for recognition of faces and related hand gestures, Prof. Second International Conference on Audio- and Video-Based Biometric Person Authentication, pp. 217--223, 1999.
    An active stereo vision system is introduced which is able to detect the face of an arbritary person in a real world environment. The face is zoomed in and tracked while the person is able to give commands to the system by particular hand gestures. The system is based on a robotically controlled binocular head, of which both cameras can be controlled independently. A controller supervisor is established which evaluates all visual information and controls particular jobs or actions based on recently obtained results. The presented system design and implementation allows the detection, the zoom, and the tracking of the face, as well as the detection and evaluation of the hand gestures, to be performed in real time.
  2. Harris, L, Jenkin, M., and Zikovitz, D. C., Vestibular cues and virtual environments: choosing the magnitude of the vestibular cue, Proc. 1st IEEE Int. Conf. on Virtual Reality, 1999. Copyright IEEE.
    The design of virtual environments usually concentrates on constructing a realistic visual simulation and ignores the non-visual cues normally associated with moving through an environment. THe lack of the normal complement of cues may contribute to cybersickness and may affect operator performance. In [5] we described the effect of adding vestibular cues during passive linear motion and showed an unexpected dominance of the vestibular cue in determining the magnitude of the perceived motion. Here we vary the relative magnitude of the visual and vestibular cues and describe a simple linear summation model that predicts the resulting perceived mangnitude of mtion. The model suggests that designers of virtual reality displays should add vestibular information in a ratio of one to four with the visual motion to obtain convincing and accurate performance.
  3. Dymond, P, and Jenkin, M. WWW distribution of private information with watermarking, Proc 32st Hawaii Int. Conf. on System Sciences, 1999.
    This paper considers the use of browser plugins and Java code (within standard HTTP mechanisms) to serve private confidential documents securely over the World Wide Web to a group of mobile of otherwise distributed users. Web secruity mechanisms typically require use of either an underlying security system for transport mechanism (e.g., SSL[7]) alternate servers and data streams (e.g., S-HTTP[9]), security-oriented plugsin within the browser (e.g., [6]), or helper applications (e.g., [11]). The method describe here operates by providing a per-user security mechanism coded in Java which operates as part of a standard web-browser environment. This system appears to be very appropriate for serving lower-security, non-public documents, files and images to a group of heterogeneous users over the world wide web. It can also be appropriate in circumstances where the standard security mechanisms are not available. We also describe an adaptation which provides automatic per-user "watermarking" of decoded pages to allow identification of the decoder.