P3D Anaglyp Viewing Without Glasses.? Yes!

[Jan Gjessing <jgjessin@xxxxxxxxx>]

Ole Hansen, 
Thanks for your input regarding anaglyph viewing. Something you
mentioned, got me to recapture another anaglyph experience.....

>George A. Themelis - fj834@xxxxxxxxxxxxxxxxxxxxx - wrote:
>> Someone suggested trying to see anaglyph images without glasses by
>> having the eyes adjusted to the complimentary colors first. We tried
>> it and it did not work.....
>The readjustment proces starts in the moment you take off the glasses,
>and to see anaglyphs you need a steady colorperception, and the proper
>filtercolors.

Well, there is another solution that really works! Have a look at:
STEREOSCOPY, "Viewing Anaglyphs Without Glasses" September 1990 p.26

Well, since some members of the p3d list might not even be members of
the ISU, and don't read Stereoscopy, I shall briefly describe how it
works here. 

Since I carried out the experiment myself, I got the "hands on" viewing
experience too. It was made possible with a holographic diffraction
screen, a transparent diffusion screen and a large field lens set up to
make up an experimental autostereoscopic screen. 

An anaglyph slide was projected by a single projector onto the screen.
The holographic screen diffraction works by it's properties of selecting
angle shift of the colour spectrum. This could be utilities by the input
of an anaglyph slide projection. Simply, it created a virtual viewing
zone in real space, both for blue and red at a certain distance from the
screen itself. Then you have to find this invisible spot in space, put
both eyes at the invisible spot to match the two viwing zones. The
autostereoscopic display will then give you a stereoscopic impression
based on the anaglyph input. The size was limited to something like
14x21cm for my experimental set-up.

I was too engaged then with being able to make it work. I had no
thoughts for evaluation whether this kind of anaglyph viewing would be
better or not. I found it worthwhile to overcome the contradiction that
anaglyph viewing always would implicate the use of anaglyph glasses for
decoding the image. Its in fact a border case as the colour filtration
of the anaglyph image is used for viewing by projection as the
autostereoscopic screen creates the imaginary glasses somewhere in real
space. 

Regards
Jan Gjessing



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