Gesture tracking

A small example will illuminate this setting. Users that participate in a collaborative session in an immersive VE are usually tracked and use mouselike input devices that provide six degrees of freedom and additional buttons for specific commands that can be used to interact with the system. As stated above, the collaborative part of this setting is that more than one user interact in the same shared virtual world. That means that all users have access or at least the possibility to interact with the presented objects at the same time, usually with a mouse-like device, gestures or speech recognition. E.g., the system detects the push of a button on the 3D-mouse over a virtual object and utters an event to the application that has then the possibility to interpret the push of the button over the object as a try to select that object for further manipulation, e.g., dragging around. In a different implementation, the user application does not see the push of the button as such, but is presented an event that indicates the selection of an object within the world and can react on that. 

Hand-wom devices Smart clothing Finger tracking Gesture-based devices... 

Bradski, G.R., Pisarevsky, V. Intel s compnter vision library Apphcations in cahbration, stereo, segmentation, tracking, gesture, face and object recognition. In 2013 IEEE Conference on Compnter Vision and Pattern Recognition, vol. 2, p. 2796 (2000)... 

We thus see many possible extensions to the concept. We could e.g. start detecting difference between hands and feet and we may be able to track different foot gestures or patterns that could be used to invoke different actions in the applications. 

Cbawla and Krauss (1994) studied subjects ability to discriminate spontaneous and rehearsed gestures. Three sets of naive subjects viewed videos without sound, heard the sound track only, or saw both sound and picture. Audiences were best able to discriminate. spontaneous from rehearsed gestures when presenred with both sound and picture. The results raise interesting questions about the ways that experts might interpret gestures as well. 

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