P3D Re: New innovations

[Jacques Cornet <jacques.cornet@xxxxxxxxx>]

All that discussion reminds me of the belgians patents 531652 and 535959 (no
wonder I found the numbers, that screen has been for more than twenty years
in my hall...). A monsieur Matagne, from LiËge, described very honestly his
process not as "3-D" but as "Ecran dissous - Projection dans l'espace" or
something like "dissolved screen, projection in space" (was that translation
necessary?)

Matagne used a single projector (with a single slide) but placed a prism in
front of the lens. So two images were projected with a "lateral
displacement" more or less correct. In front of the prism were two
polarizers, and the spectator had polarized glasses.
The "finesse" was that the screen had a large black frame, in the form of
crenels.
So both eyes could place the screen, or its frame, somewhere in space, but
the information coming to the poor brain on the place of the picture in
space was only "its seems to be somewhere else..." and, presto, it
reconstructed an "acceptable" 3-D.
That system had a small succes, locally, around 1955-1960. It gave to many
spectators very nice headaches...

Now, why would not such a "principle" work for other "sources" than dias? 
It just needs a fixed "window" -a frame- similar for both eyes, and a
lateral displacement of pictures. Best result of course with panoramas...
Just try it projecting two identical slides on a "not too clean scree" and
you will see...

Jacques Cornet Belgium


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