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Pretty neat. This seems like it actually exposes holograms the "hard" way, like you would do in a traditional setup (with lasers and beam splitters). A shortcut
by captainmuon 6y ago
Pretty neat. This seems like it actually exposes holograms the "hard" way, like you would do in a traditional setup (with lasers and beam splitters). A shortcut would be too directly print the very fine pattern that is on the holographic plate - basically a fourier transform of the image you want to encode. When I was in university we did a student's project on computer generated holograms and tried that - with a special ultra high dpi slide printer it didn't work, but strangely with a regular laser printer. The resolution was too coarse and the scale of the hologram was off, but it was really cool - if you reflect laser light from the plate, it looked as if the object was really there.
I the appendix we speculated that it might be possible to clevery use GPUs ("3d accelerators" back then ;-)) to do the calculation in realtime and show it on a very high DPI screen. Some time I'd really like to revisit the project with today's technology.
- hologram-paul 6y agoActually, recording the laser light is easier currently than trying to compute out the full fringe pattern and print. In essence the light and interference pattern captured are doing real time Fourier computation at the speed of light. 3D computational advances certainly have helped, and we expect even more as our hologram printers get more advanced with time. Thanks.
- phkahler 6y agoI've been wondering if you could compute the interference pattern and then compute the view from any specific angle - possibly on a GPU. A sort of 2d way to save a 3d model. Also wondering how feasible it is to "reproject" a hologram from one plane to another - rendering multiple "objects" into one hologram/interference pattern.
- hologram-paul 6y agoThis is definitely possible and is the basis for some computational holography. And a holographic interference pattern is definitely a way to store a 3D image in a 2D plane, and I think a part of what won the Nobel prize in physics when holography was invented.
- hologram-paul 6y agoAnd also the subject of the ideas like the holographic universe.
- spyder 6y agoRecent research on improving the hologram computation with deep learning: https://spectrum.ieee.org/tech-talk/computing/software/realtime-hologram https://spectrum.ieee.org/tech-talk/computing/software/realt...
- hologram-paul 6y agoI saw the article (it got a lot of attention talking about holograms), but I didn't see any actual holograms. I hope they get a 3D Hologram Printer so that they can actually output their computations. And go MIT!