barmar@think.COM (Barry Margolin) (01/05/89)
In article <3637@ttidca.TTI.COM> hollombe@ttidcb.tti.com (The Polymath) writes: > I'm not sure it's even >theoretically possible, let alone feasible. Well, it's been done. A couple of years ago I saw a computer-generated hologram on display at the MIT Media Laboratory. I believe it was static (i.e. like a photograph), not dynamic (like an animated display). I don't know anything about the technology used to produce it. Barry Margolin Thinking Machines Corp. barmar@think.com {uunet,harvard}!think!barmar
hollombe@ttidca.TTI.COM (The Polymath) (01/06/89)
In article <35144@think.UUCP> barmar@kulla.think.com.UUCP (Barry Margolin) writes: }In article <3637@ttidca.TTI.COM> hollombe@ttidcb.tti.com (The Polymath) writes: }> I'm not sure it's even }>theoretically possible, let alone feasible. } }Well, it's been done. A couple of years ago I saw a }computer-generated hologram on display at the MIT Media Laboratory. }I believe it was static (i.e. like a photograph), not dynamic (like an }animated display). I don't know anything about the technology used to }produce it. I was refering to using an LCD as the medium for displaying a hologram. Other technologies are coming right along. I think your example is a system under development for General Motors. -- The Polymath (aka: Jerry Hollombe, hollombe@ttidca.tti.com) Illegitimati Nil Citicorp(+)TTI Carborundum 3100 Ocean Park Blvd. (213) 452-9191, x2483 Santa Monica, CA 90405 {csun|philabs|psivax}!ttidca!hollombe
mrx@inferno.SGI.COM (induced catalepsy) (01/07/89)
hollombe@ttidca.TTI.COM (The Polymath) writes: > barmar@kulla.think.com.UUCP (Barry Margolin) writes: > } hollombe@ttidcb.tti.com (The Polymath) writes: > }> I'm not sure it's even > }>theoretically possible, let alone feasible. > } > }Well, it's been done. A couple of years ago I saw a > }computer-generated hologram on display at the MIT Media Laboratory. > }I believe it was static (i.e. like a photograph), not dynamic (like an > }animated display). I don't know anything about the technology used to > }produce it. > > I was refering to using an LCD as the medium for displaying a hologram. > Other technologies are coming right along. I think your example is a > system under development for General Motors. Indeed. The process for making computer-generated holograms is fairly straightforward; you just have to simulate the interference pattern that is produced by traditional holographic methods (fourier transforms, anyone?), print it out on some medium (enlarged), and optically or electronically reduce it to the appropriate size on film. Computer-generated holograms of this sort have been around since the mid-seventies, or possibly earlier (I forget). LCD is a different matter; holographic film has a resolution of at least 3000 grains to the inch. we definitely have a way to go before we can create such resolution in any kind of dynamic media. Robert Reimann rmr@inferno.sgi.com -- mrx@inferno.sgi.com rmr@inferno.sgi.com
hughes@math.Berkeley.EDU (eric hughes) (01/07/89)
I believe there was a whole issue of some big physics journal (phys rev???) within the last two years which was dedicated entirely to computer generated holography. If anyone is interested, I can go to the library myself and find it, but if you are that interested, you'll have to go yourself to actually see it :-). Eric Hughes hughes@math.berkeley.edu