Introducing the Gizmag Store

Consumer holographic TV creeps closer to reality

By

January 30, 2011

MIT's Object-Based Media Group has developed a real-time holographic projection system usi...

MIT's Object-Based Media Group has developed a real-time holographic projection system using (mostly) off-the-shelf consumer components

Image Gallery (2 images)

Despite a relatively tepid consumer take-up, the buzz surrounding 3D television is still quite intense. But even the viewing improvements offered by stereoscopic technology may pale by comparison to the holographic goings-on at MIT. Researchers are taking the first steps toward making holographic technology a reality for consumers. Using primarily off-the-shelf components, the team has managed to capture, transmit and display a holographic subject on-the-fly.

Personally my holographic moment came when watching the TV adaptation of Douglas Adams' trilogy in five parts, The Hitch Hikers Guide to the Galaxy. Noted coastline designer Slartibartfarst appears as a holographic recorded announcement to the bemused occupants of the Heart of Gold spaceship. But for most people, the most memorable science fiction holographic image is that of Princess Leia asking Obi-Wan-Kenobi to rejoin the fight against the Empire from the first Star Wars movie. Now, rumblings of science fiction becoming science fact have emerged from the lab of MIT's Object-Based Media Group.

A matter of perspective

Whereas all viewers of so-called 3D films such as Avatar see the same image from the same perspective no matter where they sit in the theater, the perspective of holographic pictures changes depending on the viewing angle.

A stereoscopic camera records light bouncing of an image at two slightly different angles that closely match each eye on a human face. This gives an illusion of depth, but in the real world light comes off objects at numerous angles all at once.

Holographic video systems don't require glasses in order to view a 3D image. They use devices that produce diffraction fringe patterns, light and dark streams that bend around objects in predictable ways. Bending the patterns in different directions can produce an image which looks truly three-dimensional but the process can be very computer-intensive. Zebra Imaging's Mark Lucente says that customers have been put off by the sheer computational intensity involved, "1.5 gigabytes per second are being generated on the fly."

 Edwina Portocarrero from Bove's group, decked out in tunic and wig, stood in for Carrie F...

Under the direction of Michael Bove, team members James Barabas, David Cranor, Sundeep Jolly and Dan Smalley set themselves the challenge of producing sets of fringe patterns using off-the-shelf hardware. They first tweaked a Kinect camera from Microsoft's X-Box gaming system so that it's frame capture rate was more than doubled to 15 frames per second (fps). The captured image was fed to a laptop which transmitted the data over the internet. A receiving PC sporting a threesome of commercially-available 3D graphics processors then calculated the diffraction patterns and sent the result to the one piece of the kit that's not available at consumer level ...

The Mark II holographic display

The Mark II holographic display was developed at MIT and is an updated version of holographic video display technology developed by Stephen Benton. Bove's group inherited the project after Benton's death and went on to develop its successor, which Benton's group helped design. The team is currently working on the development of a new display technology that's more compact but can produce larger images and should be cheaper to manufacture.

Help me Obi-Wan

The innovation was presented to attendees at the Practical Holography conference hosted by the Society of Photo-Optical Instrumentation Engineers in San Francisco recently. Edwina Portocarrero from Bove's group, decked out in tunic and wig, stood in for Carrie Fisher and re-enacted the famous holographic message, which was captured and displayed in real-time. It wasn't anywhere near the clarity of the movie version, but the latter was supplied by the Lucas special effects department and not generated on-the-fly using (mostly) consumer-level technology.

Given time, the team reckons that they'll get that up to the 24 fps used for feature films or even right up to 30 fps used in television, which create the illusion of continuous motion.

Zebra's Lucentne said that "by taking a video game and using it as an input device, [Bove] shows that it's a hop, skip and a jump away from reality."

Below is a video from the lab that shows MIT researchers achieve the highest frame rate yet for streaming holographic video:

About the Author
Paul Ridden While Paul is loath to reveal his age, he will admit to cutting his IT teeth on a TRS-80 (although he won't say which version). An obsessive fascination with computer technology blossomed from hobby into career before the desire for sunnier climes saw him wave a fond farewell to his native Blighty in favor of Bordeaux, France. He's now a dedicated newshound pursuing the latest bleeding edge tech for Gizmag.   All articles by Paul Ridden
Tags
3 Comments

That is a glimpse of future awesomeness. You won't need glasses and it will actually be 3d rather than just the illusion of such. It looks similar to the first images sent in ordinary 2d television but it has the chance to become acceptable quality even faster if there is the will to work on it.

Ro Atkinson
31st January, 2011 @ 01:51 pm PST

Sorry, still looks like a bunch of monochromatic scribbles to me.

alcalde
31st January, 2011 @ 05:52 pm PST

There are 3D displays that require no glasses. I just saw such a display last week at NATPE in Miami, FL. It was being shown by 3D Eye Solutions, Inc. and it was pretty darned awesome. I don't think it was quite as "intense" as the RealD version, but I would be more than happy to give up a bit of the 3D depth in order to do away with the damned glasses.

And unlike the glasses version, when you move your head from side to side, the display actually does change, just like with a lenticular image. It's pretty wild to be looking at the screen, and when you move to left, something comes out from behind something else that was hidden when your head was a foot to the right (or vice versa).

Dave Andrews
31st January, 2011 @ 06:16 pm PST
Post a Comment

Login with your gizmag account:

Or Login with Facebook:


Related Articles

Just enter your friends and your email address into the form below

For multiple addresses, separate each with a comma




Privacy is safe with us because we have a strict privacy policy.

Looking for something? Search our 26,479 articles