RE: [photo-3d] stereoview without viewer or glasses?

["Stuart Stiles" <sstiles@xxxxxxxxxxxxx>]

-----Original Message-----
 Michael Galazin [mailto:rexlion22@xxxxxxxxxxxxx] asks:

"Has anyone ever come up with a way to put a stereo image onto a screen or
other surface which can be viewed without a viewer up against the face,
without glasses, just viewed simply by looking at it from somewhat varying
distances?"

For stereo image pairs, such as are posted to the files section of this
list,
my method of viewing choice is to simply "free view" them.  It takes some
training to
do this quickly, but starting several years ago with stereograms, I have
learned
to be fairly proficient in viewing Holmes cards and monitor displays without
the
need of any viewer than my eyes (sometimes corrected by reading glasses.)  I
do
have some trouble with free viewing of postage stamp size stereo pairs, when
they
are printed in books, and with very large images (although David Trumpy
challenged
me to determine how wide a separation people could learn to free view.)


You also ask, "If not, does anyone have any ideas, theoretically, about how
it might be
accomplished?"  Discussions of the "autostereoscopic effect" have suggested
that you are
not alone in this quest. Traynor and Orr have published articles on "Direct
view Holographic Autostereoscopic Displays  <http://www.brunel.ac.uk>

Perhaps the reports on the CD of reports from
Stereoscopic Displays and Applications conferences, just posted here today
will be of interest
to you: (see:  http://www.stereoscopic.org/2001

For a full list of the CD ROM contents, visit:
http://www.stereoscopic.org/proc/cd.html  )

Dimensional Media Associates folks may also be willing to post some
information about their efforts at "3D  display technology."  I was once
pointed toward an article  in PC Magazine  (December 9, 1999) by someone on
this list. It is available at the magazine's Internet address:
<http://www.zdnet.com/pcmag/stories/reviews/0,6755,2406495,00.html>  Be sure
to take a look at the "Talkback" responses that that article generated!!!

So, go have fun.  If you do find a "low cost" way to achieve the goal you
are seeking, be sure to price it high enough to get rich on the royalties.

Stuart