[HN Gopher] A Compressive Light Field Projection System (2014)
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A Compressive Light Field Projection System (2014)
Author : rthomas6
Score : 37 points
Date : 2023-07-09 13:56 UTC (9 hours ago)
(HTM) web link (web.media.mit.edu)
(TXT) w3m dump (web.media.mit.edu)
| rthomas6 wrote:
| Interesting and seemingly overlooked multi-viewer glassesless 3D
| display technology.
| transfire wrote:
| I want my HoloTV and I want it now!
| amelius wrote:
| Apple Vision Pro comes close, but still lacks in the light-
| field department.
|
| (Your pupils get lazy from using it because everything is in
| focus all the time).
| jjcon wrote:
| > Your pupils get lazy from using it because everything is in
| focus all the time
|
| Can you explain this to me I'm always confused when people
| say it. From my thinking at least - I focus on close up and
| then far away things in VR all the time and it takes effort.
| The real world is also in focus all the time isn't it, it's
| our eyes that do the focusing.
| dylan604 wrote:
| that's like asking if a tree falls in a forest kind of
| question.
|
| in the real world, no not everything is in focus all of the
| time. i'm currently sitting 38" away from the wall, my
| monitor is 8" from the wall. If I'm focused on the monitor,
| the objects hanging on the wall are not in focus.
|
| From a snobbish videographer's point of view, it sounds
| like you're living in an ENG world vs a cinematic one.
| denton-scratch wrote:
| What's a 4D light field?
| PaulHoule wrote:
| Imagine capturing or controlling all the light rays in a plane
| (or a rectangle cut out of a plane) which ideally a light field
| display would do. A light ray intersects the plane at a point
| (2 dimensions) and is traveling in some direction (another 2
| dimensions.). That adds up to 4.
| denton-scratch wrote:
| Huh. So it's nothing to do with spacetime. Thanks.
| dsgdrfgedrg wrote:
| https://en.wikipedia.org/wiki/Light_field#The_4D_light_fiel
| d
| aidenn0 wrote:
| Viewer independent glasses free stereograpic displays all suffer
| from the same problem: you need a huge number of pixels (to
| support viewing from N angles, you need N times as many pixels).
| icapybara wrote:
| Well yes, you need to make a new type of display. It's not a
| software technique to be applied to existing displays.
| thfuran wrote:
| The point Isn't that it needs to be new but that the new
| thing fundamentally is far more demanding. If you have many
| times more pixels per frame, your GPU has to do more work,
| your display cable has to have more bandwidth, etc.
| NL807 wrote:
| Yep, I was thinking about a lenslet array system with NxN
| subpixel under each lenslet. The subpixels are view dependent
| by emitting light directionally using fish eye magnification of
| the lenslet. For 64x64 subpixel resolution (giving you around
| 256 view angles), you need a total of 512 megapixels for a
| 1080p lenslet array.
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(page generated 2023-07-09 23:01 UTC)