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Mark A. Livingston
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Journal Articles
Publisher: Journals Gateway
Presence: Teleoperators and Virtual Environments (2004) 13 (2): 211–221.
Published: 01 April 2004
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The full power of mobile augmented and virtual reality systems is realized when these systems are connected to one another, to immersive virtual environments, and to remote information servers. Connections are usually made through wireless networks. However, wireless networks cannot guarantee connectivity and their bandwidth can be highly constrained. This paper presents a robust event-based data distribution mechanism for mobile augmented reality and virtual environments. It is based on replicated databases, pluggable networking protocols, and communication channels. The mechanism is demonstrated in the Battlefield Augmented Reality System (BARS) situation awareness system, composed of several mobile augmented reality systems, immersive and desktop-based virtual reality systems, a 2D mapbased multimodal system, handheld PCs, and other sources of information such as external data servers.
Journal Articles
Publisher: Journals Gateway
Presence: Teleoperators and Virtual Environments (1997) 6 (5): 532–546.
Published: 01 October 1997
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We apply a look-up table technique to calibrate both position and orientation readings from a magnetic tracker for use in virtual environments within a defined working volume. In a test volume of 2.4 cubic meters, the method reduced the tracker's average position error by 79% and its average orientation error by 40%. We test the correction table against the tracker's performance outdoors (a metal-poor environment) and show that readings taken in our lab and corrected by our method exhibit less error than uncorrected readings taken outdoors. We demonstrate that such reduction in position error visibly improves registration in an augmented reality system, whereas the (lesser) reduction in orientation error does not visibly improve registration. We show that the model we used for the orientation error function was incorrect, preventing our method from achieving better correction of orientation error, We discuss future directions for correction of orientation error.