This doctoral dissertation focuses on the development of interactive spaces through the use ofudnatural interfaces based on gestures and manipulative actions. In the real world people use theirudsenses to perceive the external environment and they use manipulations and gestures toudexplore the world around them, communicate and interact with other individuals. From thisudperspective the use of natural interfaces that exploit the human sensorial and explorativeudabilities helps filling the gap between physical and digital world.udIn the first part of this thesis we describe the work made for improving interfaces and devices forudtangible, multi touch and free hand interactions. The idea is to design devices able to work alsoudin uncontrolled environments, and in situations where control is mostly of the physical typeudwhere even the less experienced users can express their manipulative exploration and gestureudcommunication abilities.udWe also analyze how it can be possible to mix these techniques to create an interactive space,udspecifically designed for teamwork where the natural interfaces are distributed in order toudencourage collaboration.udWe then give some examples of how these interactive scenarios can host various types ofudapplications facilitating, for instance, the exploration of 3D models, the enjoyment of multimediaudcontents and social interaction.udFinally we discuss our results and put them in a wider context, focusing our attention particularlyudon how the proposed interfaces actually improve people’s lives and activities and the interactiveudspaces become a place of aggregation where we can pursue objectives that are both personaludand shared with others.
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