[photo-3d] Quiz no. 1 - What is Stereo?

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

The first pair of the quiz (as most of you guessed 
correctly) is a non-stereo pair.  It shows the same 
identical picture.  As Mike K. said, "it is flat as 
a pancake!".  Bob Al. put it elegantly: "stereo base 
is too small!"

For those who ask if they can make double prints of their 
flat prints, mount them in cardboard and enjoy the "stereo 
pair" in the "stereoptican", the answer is, "no way!"
That's because:

Identical pictures = NO STEREO!

But, what is stereo exactly?

The two members of the stereo pair are identical in all 
respects except for one:  There are small displacements 
called stereoscopic devations.  For a properly recorded 
and mounting stereogram, these are in the horizontal only 
direction (line joining the eyes).  T

Upon fusing these two images, our brain translates the
stereoscopic deviations to depth.

With this background we are ready to tackle quiz no. 2.

George Themelis