Google Play Service 7.8 introduces the android vision library. that can easy to implement the function of
face detection and
barcode reader. the best part of it is that supports android 2.2 devices. you can checkout the sample code
here.
Random idea: the traditional digital camera support smile mode. that means you can take photo by your smile face. now you can do the same thing on the android app. or you can trigger it by a wink
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