How Amazon's Fire Phone Cameras Know Where Your Face Is Even at Night

The Amazon Fire Phone's Dynamic Perspective—the famed "3D effect"—works almost as if by magic. As you look at the phone and move it around, the Fire Phone watches you back, and changes what you see. It's not voodoo, though. It's crazy camera tech. Here's a closer look at how it works, even in the dark.

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An interesting read via Gizmodo