Re: Stereo Window - Poll time!

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>
>Date: Fri, 20 Jun 1997
>From: P3D  Dr. George A. Themelis  complains ;-)
>
>Hey, one at a time!!!  Greg, Larry, etc. take a number.  Now I
>am answering to Paul:
>
>>> On the other hand, the window is an artificial contraption...
>>    
>>An artificial contraption?  As your article states, it is formed
>>by the mask of the slide mount.  That is a very real contraption
>>occupying a fixed point in space when the slide is in the viewer.
>
>Does that mean that it is located 44 mm from the eye in a RB viewer?
>What's that talk about the window being at 7 feet?

*****  Again this talk of how many feet? In a themelized RB Viewer, the
image is a veryshort distance away and so is the slide. The angles and the
fact that optics allow you to focus on the information is all that provides
a sense of the image occupying many feet of space. You can't stick a
yardstick into the reconstruction and get any kind of meaningful measure.
You could take a photo of a measuring tape and identify exactly where on
that tape, the window is set for any example. That includes use of the RB
viewer. Use your 7P Realist for the image and mount to a 5 perf frame and
play with this whole idea.

>
>The "stereo window" is not the same as the slide mask.  The slide
>mask is a real object located at a specific distance from the
>eyes (in the viewer)  This mask creates a frame of reference that
>resembles a real window (hence the name) of a certain size and
>location from the observer when the image is viewed stereoscopically.  
>The window is just a frame of reference.  It is not a real object.

*****  The slide mask is just a slide mask, but since it defines coincident
planes of image information, it coincides with the stereo window itself, and
for all practical purposes is the same thing. It's function as the edge of
visible information is different from it's purpose as carrier of a film
chip. The window it creates is much more than a semblance of a window, it
coexists in this instance with the *stereo-window* itself. It is as real a
place as any other image element in your stereo pair. It can be seen as such
whether freeviewed, placed in an RB viewer, or viewed electronically, all
other mounting/masking factors the same...

Larry Berlin

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


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