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Abstract: “Human – Computer Interaction (HCI)” is the study of interaction between people (users) and computers. It is an interdisciplinary subject, relating computer science with many other fields of study and research. Interaction between users and computers occurs at the user interface which includes both hardware i.e. peripherals and other hardware and software for example determining which, and how, information is presented to the user on a screen.
In this paper we describe a physical user interface system for easy and natural user-computer interaction. VisulaPen is vision-based system for real-time detection and tracking of a stylus that completely replaces mouse and keyboard, thus providing a valid input device for mobile computers, and its low computational complexity renders it suitable also for PDAs. The system can be operated from a wide range of distances (either from a desk or from a wall – mounted projection panel) and is able to work with all lightning conditions. The architecture of the system is here described, and experimental results in several tests are presented and commented.
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