Communications of the ACM
MIT Breaks New Ground in Gesture Control
A group of MIT researchers claims to have made a significant leap in gesture-controlled computing, due to a new kind of LCD screen configuration they describe as a "lenseless camera." Leveraging recent advances in LCD technology, the team's so-called BiDirectional or BiDi Screen display is capable of both capturing and displaying images on a very thin screen, creating the possibility for highly sensitive gesture control in devices as small as smart phones.
They debuted a working prototype on Saturday (December 19) in Yokohama at SIGGRAPH Asia 2009, the conference of the Special Interest Group on Computer Graphics and Interactive Techniques.
The BiDi Screen can shift back and forth between capture and display modes at a speed that renders the activity imperceptible to users. The distinctive feature of the design is an array of optical sensors placed just behind the conventional LCD display surface. The LCD surface in its capture mode displays a pattern of black and white rectangles, allowing light to pass through to the sensors. Data from multiple views is correlated in order to judge the depth, distance, and motion of objects placed in front of the display.
From Venture Beat
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