Re: [photo-3d] The jig's up (part III)

["Dr. George A. Themelis" <drt-3d@xxxxxxx>]

From: "Dr. George A. Themelis" <drt-3d@xxxxxxx>

Here is an example of an obviously tilted stereo pair:

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=287003969

This is a rare example where the tilt is more objectionable
in the 2d picture (notice how the buildings are tilted to the
right) than the 3d picture. (Or, is that the rule?)

Tilt is defined only in relationship with some clues that indicate
what the horizontal direction is (in this case, the buildings).
Quite often this horizon is the sea level.  It is hard to argue
that the sea level is not leveled!

There are picture with absolutely no clue of the horizontal
direction.  This is the case when you have a circular
symmetry.  For example, when shooting a scene looking 
straight down.  You can tilt the camera any way you want,
without any problem.

I have a very cute stereo slide from the 50s.  Someone put
a stereo camera in the floor and had all his friends form a
circle and look down at the camera.  In my stereo projection
demonstrations I show this slide and then I turn it upside down
and show it again.  Both pictures are equally acceptable with
different people being up and down in each case.

That's all I know about tilting the stereo camera!

George Themelis
http://home.att.net/~drt-3d/


------------------------------------------------------------------------
DON'T HATE YOUR RATE!
Get a NextCard Visa, in 30 seconds!  Get rates as low as 
0.0% Intro or 9.9% Fixed APR and no hidden fees.
Apply NOW!
http://click.egroups.com/1/2120/5/_/160438/_/953651420/
------------------------------------------------------------------------