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The invisible keyboard for smartphones

Samsung has developed a way for smartphone owners to type on a table or other surface as an alternative to tapping on the handset's own screen.
Its SelfieType software tracks the user's fingers via the phone's front-facing camera and works out where the taps would correspond to being on a Qwerty keyboard.
Chris Fox tried it out at the CES tech expo in Las Vegas to see if it works in practise.

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