Paul Debevec and holography
Paul Debevec and several researchers at the University of Southern California's Institute for Creative Technologies have built a teleconferencing system that captures a person's face and head and instantaneously displays it as a 3-D image. Surprisingly, much of Debevec's system consists of consumer-grade parts: a standard video camera, an off-the-shelf graphics card and an Internet connection. What makes it work are clever algorithms that efficiently calculate the 3-D information, a rapidly spinning mirror and a couple of tricked-out video projectors hot-wired to display 8,640 frames per second. Normal projectors display 60 frames per second. A video camera captures an image of the user's face, while a projector casts a set of blurry lines that scan the face for depth and texture. Two projectors trained on a mirror spinning at 900 rpm inside a Plexiglas box create a somewhat ethereal but realistic-looking head.
Read the paper on Alibaba.com here.