People would be able to make faces in place of a password, with the system confirming identity by their actions as well as their looks.

Google has filed a patent that would let people make faces instead of entering a password when unlocking their Android phone or tablet. This system would confirm someone's identity not only by their looks but also by their actions.

Some of these acceptable actions include a frown, forehead wrinkle, an open-mouth smile, sticking their tongue out, and eyebrow movements. Requiring specific gestures could prevent the Face Unlock feature being fooled by photos.

The software would track “facial landmarks” and compare two images taken from a captured video stream of the user's face to see if the correct action had been carried out.

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