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Displays The Military Technology Build

Real 3D Display; 3 Years Out? 191

Posted by timothy
from the obi-wan-come-back-in-a-few dept.
Bob the Super Hamste writes "Fortune magazine is reporting that the company Zebra Imaging is producing a 3D hologram table that will project a 360 degree 3D image that doesn't require glasses. Funding for this project is being provided by DARPA for battle planning. The company expects it will take at least another three years for the table to be ready for commercial applications."
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Real 3D Display; 3 Years Out?

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  • Re:Hogel? (Score:3, Informative)

    by Aladrin (926209) on Tuesday October 18, 2011 @12:43PM (#37751364)

    http://en.wikipedia.org/wiki/Hogel [wikipedia.org]

    "In opposition to 2D pixels, hogels contain 3D information from various perspectives."

  • Re:A real hologram ? (Score:4, Informative)

    by bmacs27 (1314285) on Tuesday October 18, 2011 @04:41PM (#37754458)
    K. First of all, the google search term for research on this stuff is "light field," or more specifically "plenoptic light field." The logic works the same way for light field cameras (which allow you to focus the image post-hoc), and light field displays (which display the configuration of rays of light you would see were that 3d object really present). Basically you begin with an array of lenslets. Each lenslet has underneath it an array of pixels like you would have in a normal monitor. The idea for this sort of optical system came from studying compound eyes, and their depth of field. It turned out that because the lenses all had different nodal points, you could use the pixel stimulated underneath multiple different lenslets by the same object to effectively triangulate its position, and even do some post-hoc processing to come up with the image you would have received with lenses of different powers. Here are some papers on the original ideas, and their modern application to plenoptic light-field cameras:

    Adelson and Wang: http://persci.mit.edu/pub_pdfs/plenoptic.pdf [mit.edu]
    The most advanced implementation I know about, the Stanford light-field camera: http://hci.stanford.edu/cstr/reports/2005-02.pdf [stanford.edu]

    Anyway, the next realization is what should you see if you were actually looking at light reflecting off of objects in a 3d world. Well, light bounces off your nose or whatever, and scatters in various directions with some reflectance properties. Thus, if I were to rotate my viewing position about your nose, I'd see roughly similar wavelength rays of light emanating from that point (assuming diffuse reflection). So, to simulate that, you simply activate the pixel under each lenslet which when bent by that lenslet will send a columnated beam of light along the trajectory that intersects with the point in 3d space where I want to simulate your nose. Since you are activating pixels underneath many different lenslets to emit the rays reflected in each direction from that point, you can see that you are literally recreating the rays of light that would have been created by light reflecting off of that point in 3d space (at the limit with infinite resolution columnated beam widths, etc).

    Close enough?

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