The IEEE Virtual Reality (VR) Conference is the leading forum for the dissemination of cutting-edge strike technical advances in VR. This special issue features significantly expanded versions of five of the best papers from the IEEE VR 2008 proceedings. We would like to express our sincere gratitude to the anonymous reviewers, who have diligently assisted us in attaining the highest quality for this special issue. One of the key enabling technologies for augmented and virtual reality (AR and VR) is user tracking. The first paper, "Advanced tracking through efficient image processing and visual-inertial sensor fusion" by Gabriele Bleser and Didier Stricker, presents a new visual-inertial tracking device for AR and VR. There are two fundamental issues for designing such systems. The first one is regarding the definition and modeling of the sensor fusion problem. Although much work has been proposed to address this issue and several models for exploiting gyroscopes and linear accelerometers have been suggested, the respective advantages of each model are still unclear. This paper provides a comparison of different models with special investigation of the effects of using accelerometers on the tracking performance.
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