Building a Better Snapshot

Face-detection autofocus -- a system in which the camera can actually identify one or more faces in a scene, then focus on them rather than an arbitrary, fixed point -- has become the must-have feature in digital point-and-shoots. I just learned, though, that Japanese engineers are taking this notion a step further. They're reportedly developing technology that won't let you shoot until no one in your picture is blinking, and all eyes are open. They're also working on a similar system in which the camera won't let you take a picture until the face or faces in your scene are all smiling.