Omnitouch is a unique input/output system in which a shoulder-mounted depth-camera, recognizes flat surfaces within an arm's length and a projector, which turns that surface into a screen. Moreover, the camera recognizes the patterns of your fingers, and tells where you move them and when you touch that surface, essentially turning it into a touch-screen! Your hand, your forearm, your notebook, a wall or even a wall close to you can all be used for this project.
Taken from Chris Harrison's homepage this ingenious project also follows the spacial and angular orientation of the surface so the image presented does not deteriorate. It can even identify multiple surfaces to be used as different screens or panels, like in the video below where the user paints on the wall-panel while using his left-arm-panel as a palette. The system provides full functionality of clicking, double-clicking, dragging etc which approaches the accuracy of "conventional" touchscreens (when did touch screens became conventional?)
Of course what caught my attention was in the end of the video where the separation of "private" and "public" views was presented by recognizing the angle of the projection surface. When the user wants others to see what he is writing, he keeps the panel horizontally. When not, he keeps the panel vertically, close to his chest.
Interested in it? see the following video to see the outline of the algorithms used for the image recognition
or read the project paper
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