Researchers from the MIT Technology Media Lab used a display with an embedded optical sensor as a lensless camera to recognize gestures in front of the screen. Several researchers have tended to develop a system that can be integrated into a thin and light LCD along with techniques such as capacitive sensing, thus providing the user with a gesture-based interactive interface.
Previous gesture recognition systems were based on optical technology and typically included expensive cameras or had the user put an optical tracking tag on the finger. Other ways of experimenting, like Microsoft's Natal, use a compact camera that is embedded outside the display. However, because the camera is far from the center of the screen, close-range performance is not good; and, they do not provide a seamless transition from touch screen to optical gesture recognition.
In the MIT system, the liquid crystal array of the display works with an optical sensor array behind it. In optical sensing mode, the LCD displays an opaque and transparent interlaced area that allows light to pass through to a 19 x 19 sensor array. This area changes very quickly, so no matter what screen the LCD displays, the observer will not notice it.
The researchers compared the system to a pinhole array that produced a low-resolution image. Because each pinhole camera generates a photo from a different location, the image is analyzed to see the distance of the object in front of the screen. But unlike pinholes, clear/opaque areas can transmit more light, allowing it to quickly transition and hide as the image. Furthermore, the 19×19 area is close to each other, and the acquired images will overlap. This area will free the system from the calculation of the image and capture the same depth information as the pinhole array, but at a much faster speed. .
Researchers used a fake TV set to record images passing through the area at a distance from the screen. The experimental results show that the user can control the objects on the screen through gestures and can seamlessly switch between gesture control and ordinary touch screen. Researchers have explored the possibility of using this system as a high-resolution camera to replace low-resolution 3D image capture systems.
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