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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Holography

Gavin Greenwalt

Gavin Greenwalt

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Really impressive hologram:
http://www.youtube.com/watch?v=_9QR3qaK_Cs

I wonder how many years before we could get that quality of glasses free depth at 24fps. If they can make a still they can inevitably make motion.
 
Nice....
 
Not only is it an impressive hologram, but the viewing angles seem fairly large too.
I'd love to see this in cinemas, but it could be years before we see anything like it. In the meantime I don't mind the Joe 90 glasses.
 
Gavin Greenwalt said:
Really impressive hologram:
http://www.youtube.com/watch?v=_9QR3qaK_Cs

I wonder how many years before we could get that quality of glasses free depth at 24fps. If they can make a still they can inevitably make motion.
Click to expand...

Actually animated Holograms called Multiplex Holograms were developed at the school of holography in San Francisco back in the early 70's. The inventor was a man named Lloyd Cross. The most famous of his holograms was called The Kiss.
 
Lloyd Cross

Lloyd Cross

Norman B. Miller said:
Actually animated Holograms called Multiplex Holograms were developed at the school of holography in San Francisco back in the early 70's. The inventor was a man named Lloyd Cross. The most famous of his holograms was called The Kiss.
Click to expand...

When I was in high school I was working on 3D autostereographic video display designs based on Nipkow disk scanners that would have motion parallax and made an appointment to see the Multiplex Hologram printer.

Lloyd Cross was very kind to me in showing me all the details of their setup, I was about 16 at the time, and one interesting thing to me was the way they made the cylindrical field lens in their printer, it was two sheets of thin clear plastic bent into the right curve (I think with set-screws in the frame in contact for adjustment of the curve) filled with clear mineral oil (baby oil).

I used that idea of having a large cylindrical lens behind a moving slit in a drum in front of a CRT to reduce the width of the CRT and to reduce some of the computation on the processing of the video data to produce a video version something like the Mutiplex Hologram, but free of some of its distortions, that design was later published with another using the Nipkow disk to get both vertical and Horizontal motion parallax, where as the cylindrical lens version would only have Horizontal parallax, as was the case in the Mutiplex Hologram.

The advantage back then was that the Horizontal parallax only version of the video display would be able to have higher resolution for the same bandwidth of video signal at a given fps.

They used a Mitchell Standard or High Speed to shoot 35mm movie film of the subject on a turntable, then printed the processed 35mm black and white film through their Mutiplex Hologram printer, where the mineral oil field lens was used. I don't remember if they had an Acme projector or just an old movie projector as the gate in the printer, I was not up on printer details back then and it was 37 years ago so the memory of what I see in my minds eye is a bit faded, I do remember that their digital counter to control the printer was made using little kit circuit boards about 2x3 inches using transistors to build a flip-flop, rather than using 7400 series IC chips, I don't know why, the logic was quite large and mounted on the wall or something, maybe a meter square, I'm not sure but maybe small light bulbs or Neon lights for readouts as it was before LED were low cost and replaced those... I heard he moved to the south west or something after leaving San Francisco?
 
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