How to prevent someone using a photo to defeat facial recognition screen lock?

My wife’s Android phone, a Galaxy S4, has a feature that uses facial recognition to unlock the device. One criticism I’ve heard criticism of this method is that someone can just use a photo of you to unlock it. Is there a way to prevent someone from using a photo to defeat the facial recognition security lock?

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Story added 11. June 2014, content source with full text you can find at link above.