P3D Holograms and true 3D

[Dale Walsh <dwalsh1@xxxxxxxxxxxxxxxx>]

>  Holograms have a few features similar to
> the real (3d) world that stereo pairs don't
> have: as you move from side to side your
> viewpoint changes, as you move up and down
> your viewpoint changes so you can see behind
> or over objects. Also, you have to focus at
> different depths to see the image that appears
> to be at that depth. This is quite unlike a
> stereo slide where you have to uncouple the
> focusing of your eyes (focus at a fixed distance)
> while you view objects in the scene that appear
> to be at different depths.
>
>   This isn't to say that a hologram is better
> or looks more real.
>

Actually, in a holography book I have, they put it another way.
Quote :
Holography is the first truly 3D image making process, since it
recreates what light waves actually do after reflecting from a real
object.
from Holography Handbook published by Ross Books

The way I understand it, from seeing many of them, is that a three
dimensional light _object_ is recreated and sits in front of and/or
behind the flat plate which (only) stores the necessary retrieval
information.  It is possible to put your hand into this light object.
This is quite different from stereoscopic imagery where the only 3D
_objects_ are those in your mind.

Dale Walsh

mailto : dwalsh1@xxxxxxxxxxxxxxxx
http://welcome.to/solidillusions



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