Researchers are working to achieve the "magic rate" of 30 frames per second.
In a development with important implications for future teaching and learning, scientists say they have taken a big step toward displaying live video in three dimensions—a technology that is much more advanced than 3-D movies and more like the “Star Wars” scene where a ghostly Princess Leia image pleads, “Help me, Obi-Wan Kenobi.”
In that classic movie, the audience sees her back before a new camera perspective shows her face. Such a wraparound view of a moving image was just movie-trick fantasy in the 1977 film, but now?
“It is actually very, very close to reality. We have demonstrated the concept that it works. It’s no longer something that is science fiction,” said Nasser Peyghambarian of the University of Arizona.
Actually, the results he and colleagues report in the Nov. 4 issue of the journal Nature look more like a slide show than a video. In experiments, the technology displayed a new image only every two seconds.
That’s only about one-sixtieth as fast as the system would need to produce true 3-D video.
The image also gave only a 45-degree range of viewing angles, because the original was shot with 16 cameras laid out in an arc.
But Peyghambarian figures that with more development—and more cameras—his team can produce a true 3-D video screen that might reach classrooms and laboratories in perhaps a decade. And you wouldn’t need those funny glasses to appreciate it.
Apart from the possibilities for education, it might allow doctors in multiple places around the world to collaborate on live surgery, he said. If the screen were placed flat on a table, they could get a 360-degree view by walking around, just as if the patient were lying there.
While the 3-D video image would not actually be projected into the air, that’s how it would appear to a person looking into the screen.
Other possibilities, Peyghambarian said, including eye-catching ads at shopping malls and a technique to enable designers of cars or airplanes to make changes more quickly. Live 3-D video also could help the military train troops, he said.
We see objects by perceiving the light that bounces off them. Peyghambarian’s technology uses holograms, two-dimensional images that reconstruct the light that would have bounced off a physical object, making it look 3-D.
In contrast, technology used for 3-D movies like “Avatar” or the election-night “hologram” of a CNN reporter in 2008 produces images that don’t show different views from different angles, as a genuine hologram or a real object does, Peyghambarian said.