JanusVF is a tracking solution involving a cooperation of both the hardware sensors and the software rendering system. The objective of this project is to design a tracking solution for fully enclosed VR displays that achieves comparable performance to available commercial solutions but without any artifacts that can obscure the user's view. While several 6DOF tracking projects such as Hedgehog have successfully demonstrated excellent accuracy, precision, and robustness within moderate budgets, these projects still include elements of hardware that can interfere with the user's visual experience. Several critical limitations exist in the currently available tracking technologies for fully enclosed virtual reality (VR) systems. We briefly conclude with the results of case studies conducted with the system. The study has been conducted on the modern mobile platform Android, and utilises some Google-supported technologies. We provide a short introduction to mobile augmented reality technologies, present existing work in this area and provide technical insights into the solutions that we have investigated. In our conceptual and experimental deployments we have tried two different user interface-based solutions: the augmented camera view and the augmented map view. We describe the system architecture and usability challenges of the system. The system allows capturing, storing and presenting time-, context- and location-specific annotations to the user of a smartphone. As an example, we present our implementation of the annotation system called Virtual Stickies. We stress technological challenges, usability, and novelty of spatiotemporal contexts that can be generated and consumed by users of ubiquitous and mobile computing devices. In this chapter, we discuss the concept of spatiotemporal annotations of real objects in the urban environment. Complex sensory and computing features of these devices provide excellent opportunities for advanced, context- and location-aware applications. Smart-phones and other mobile devices are becoming increasingly ubiquitous.
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