Re: Farthest Stereo

[P3D Norm Goldblatt <normgold@xxxxxxxxxx>]

Amazingly, the human brain can can read a depth clue from as little as 2
seconds of parallax.  This is 1/15 the size of a cell in the retinal
mosaic. 2 seconds works out to be 10,000 feet for a IPD/2 of 33 mm. I
have heard the statement that a reasonable distance beyond which there
is no meaningful stereo info is about 2,000 feet.  Even THAT is amazing,
isn't it?!  As an example, if you were to look at a tree 1/3 mile away
against the moon as a backround, you could tell the tree and the moon
were non-coplanar. It would be tough to separate stereo cues from
pre-knowledge of what you were looking at, in this case. 

By the way, being able to detect angular differences smaller than  a
retinal cell also evidences itself in 'vernier acuity', our ability to
detect a break in a straight line, even if the 'jog' is only 2-5 seconds
of arc.  Which all goes to prove- Darwinian selectivity favors
engineers!!!

I have been watching Hale-Bopp for the last few weeks. I am mentioning
this in Photo-3D because I found a loophole in by-laws-  See, I was
looking at it with both eyes!!

One final thought-  Can you convert a 2D photo into 3D using the new
cloning techniques?


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