Gestures are becoming the newest user interface innovations, allowing normal actions such as lifting a phone to your ear to trigger the answering function (if the phone is ringing). Look for gestures to become the dominant user interface (UI) modality within five years. R. Colin Johnson @NextGenLog
2-D gestures pioneered at Apple for its trackpad are being one-upped by Google's Android which has built 3-D gestures into its Android OS.
Here is what my Smarter Technology story says about gesture recognition: Gesture user-interface features were included in Google's recently unveiled Gingerbread release of the Android operating system. As a result, Android smartphones have an opportunity to one-up Apple's iPhone with advanced gesture recognition, such as the "lift-to-answer" feature in LG's Optimus Black smartphone just announced at the recent Consumer Electronics Show in Las Vegas. Android programmers can now leverage the new motion processing application programmers interface (API) in Gingerbread (version 2.3) to create natural acting algorithms that leapfrog Apple’s iPhone. OEMs can use any gesture to activate any feature on their phones--for instance, LG's Optimus Black uses "shake" to invoke camera mode and a "tap" to invoke its music player...
The world’s slimmest smartphone, at 9.2 millimeters, is also the first based on a gesture user interface.
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