Re: SL3D per John B

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Sun, 25 May 1997
>From: P3D john bercovitz writes:
>..................
>It is possible to put two apertures in a lens instead of one.  All 
>you have to do is take out the iris assembly and substitute a thin 
>black piece of sheet metal with two holes in it.  In fact, some 
>makers of macro cameras do this very thing.  By installing two 
>holes, you are creating two centers of perspective and that is the 
>essence of stereo photography.  Of course now your big problem is 
>how to separate or decode the two images;...............

..........................
>The neat thing about split-aperture SL3D as done by Carter or 
>Songer is that you can change the separation of the centers of 
>perspective merely by changing the diameter of the opening of the 
>camera's original iris. .................

I remember this discussion and appreciate getting to see it reviewed here.
However this description doesn't at all describe how the TV broadcast
industry would use such a technique to send the combined left and right
images across cables or current video routes *the same as a standard
flattie*. Hence my confusion from Bill's description:

>>That's because SL3D broadcasts exactly the same as a standard flattie. You
>>need the shuttered glasses to recover the 3-D, yes, but there are no
>>annoying dual lens artifacts to degrade the 2-D image. 

>From John's description there would be just as much *dual lens artifacts*
with SL3D as with a two camera 3D signal. In addition, the total available
stereo base is limited to something less than the diameter of the taking
lens, which is inherently quite limited. Since Bill's discussion was about
TV broadcast methods, and John's description is about film cameras, I am
still lost. 

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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