P3D Re: Ortho Relativity

["Dr. George A. Themelis" <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

>"Ortho" stereo attempts to document and replicate the real world in 3-D as
>it is seen with the average interpupillary distance of 2 1/2"--and, as much
>as possible, to display that stereo image with all binocular disparities
>suppressed, except for parallax.

Too many words! :-)  Can we condense this?  Suppress binocular disparities 
except for parallax?  Seems irrelevant to "ortho".

>As practitioners of the technically-based art form of stereography we
>always have the option of using established guidelines (such as the
>one-to-thirty rule for determining a stereobase for photography) or
>dispensing with them.  But in no case should we be bound by them.

Note that the "1/30 rule" has nothing to do with ortho... As a matter
of fact it is anti-ortho... :-)  

>A presumption of ortho stereophotography is that 3-D is a mimetic tool for
>capturing the "real" world.  That is true.  But it is also so much more
>than a means to merely imitate the world.

Ortho stereophotography makes no presumption about what is what is not
3d.  There is no doubt that 3d (stereoscopic imaging) is more than ortho 
stereo photography.  In 1835 Charles Wheatstone presented to the world
the first stereoscopic drawings and an instrument to view them.  There
was no ortho stereo photography back then, no stereo photography and no
photography.

Ray, it seems to me that you are trying to make the obvious point that
there is much more than quasi-ortho stereo photography.  I don't think 
anyone has a problem with this statement.  You also urge us not to be 
bound by any rules.  That's a good advice.  But I think we should also 
try and understand what purpose do these rules serve.

-- George Themelis


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End of PHOTO-3D Digest 2468
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