Virtual chalk

By Barry Fox Telecoms company Mitel of Ontario is developing a blackboard that works like a computer touch screen (GB 2 315 859). A video camera feeds images of the board to a computer, which identifies the lecturer’s hand and works out its position. These coordinates are used to move a cursor on a computer screen and control that computer— just like using a mouse to move a pointer on a screen. If the “virtual blackboard” also acts as a screen for an image projected by a computer, the lecturer can work through a menu of options by tapping the board,
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