Behind the screen.

[T3D Jose Joaquín Lunazzi <lunazzi@xxxxxxxxxxxxxx>]

Dear 3Ders,
           I made a presentation on applications of my diffractive 
screens at SHARP in Tokyo, referring my point of view on the 
limitations os stereo 3D images.
My claim is that it will never be possible to show 3D without 
goggles to more than one observer at a time, due to the lack of 
continuity on the transition between viewpoints.
And that the scene will also never be seen in full depth.
An executive ask me then if it would be possible to see images 
behind the screen because stereo can not do that.

I answered that I do not know about stereo (in fact, I always saw 
images in front of the screen, never a person or car goin deep 
behind) but that I did images more than 30m behind the diffractive 
screen, and maybe more would be possible.

Can you tell me about the possibility of putting an object in a 
stereo scene, in a movie f.ex., going behind the screen?.

By the way, let me comment that SHARP has a very nice show room there 
and, although they mention 3D as images for the utopic future, they 
do not even show there the experimental 3Dgoggless TV made by SHARP 
in England.  I received a description of this, and saw another setup
in another exhibit working under not the same but more or less similar 
principles.

SHARP model uses Fresnel almost plane lenses, the system I saw is 
from ZEISS and uses a lenticular screen.  The ZEISS system  
uses glasses without glasses  ;-) (understand?) what is a kind of 
goggle, in the end, to fix a dot in the middle of the observer's 
head.  The lenticular screen will then follow your head movements by
a servo mechanism.  
So you can move your head, always seing the same scene from the same 
viewpoint.  And depth seems to be limited to some 10cm, 5 in front 
and 5 behind the screen (about 20cm x 20cm).

I could not visit SANYO, who is the only one selling a 3D goggless 
TV system. I was affected by cold air when presenting a paper in 
Nanjing, China, a very hot and humid place in summer but with powerful 
air conditioning machines directed towards the privilegiated speaker.

All this above is an excuse to tell you about what SHARP really shows 
which, although is not 3D, it is worth to know.
They have a not too large cinema (about 300 seats) in the show room 
with three liquid crystal projectors supperposing images to bring 
HHDTV. (The double HH = Higly High is my conceptuation, I do not know 
which name they give to this incredible images).
Not only definition, but the color quality, makes you to want more of
that, and no more ordinary movies.

Well, I think that maybe I will be filtered by here, it is being a long
message, maybe not too appropiated for Tech 3D, so I stop to here 
your comments.

Jose'  Lunazzi           8-{@

eternal address: 
                lunazzi@xxxxxxxxxxxxx 
[will be actualized even from heaven or hell  :-)    ]

mortal address: 
               lunazzi@xxxxxxxxxxxxxx

[EOM]


------------------------------

End of TECH3D Digest 55
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