We've seen glasses with embedded cameras, and cameras that let you frame shots with your fingers. But we're not sure we've seen anything quite like Kaushal Agrawal's "Snap." It combines these two things and lets you take pictures with a one-handed gesture in conjunction with a camera mounted on spectacles. Software provides the fourth corner of the rectangular frame -- two sides of which you've already created with your thumb and index finger.
You can check out the technical details on the project page. And if you stick with the video long enough, it'll make your head spin (and your respect for Agrawal soar) with the project's seeming complexity. Keep in mind, btw, that while the glasses in the video look a little clumsy, they're only a (functioning) prototype.
For more projects from Golan Levin's Interactive Art and Computational Design class at Carnegie Mellon, go here.