Re: John!!!

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

Bill writes:

> John B progenates:

Bill, I'm going to have to buy a _thesaurus_!  I can't begin
to keep up with you.  8-)  8-)

> I would shoot the surface of some textured sphere. ....
[...]
> Finally, I would show it to an audience,.....

I like that but I'm concerned that it might be a difficult 
subject.  Just a feeling - no rational reason for it.  Jim C, 
does this seem like a sensitive enough test for what we're 
trying to test here?

Bill, you mentioned discovering this phenomenon in a view
with one thread lying on top of the other.  I wonder how it
would be to have two very black threads so you can't tell 
which occludes the other except by depth.  Sort of getting
back to where it all started.  You could use different sizes
of threads or different distances from camera to threads for
the variable.

Carrying this scheme further...
Another thought, and this is more difficult to build, is to 
have two wires that appear coaxial in a head-on view but one 
lies _slightly_ behind the other.  So head on:

                      |
                      |    one wire
                      |

                      |
                      |   t'other wire
                      |

Now in the standard model the stereo pair would look like this:

         Left view                  Right view

           |                             |
           |                             |
           |                             |

            |                           |
            |                           |
            |                           |

In the Carter model, they would look the same (?) but it would 
be a lot easier to determine which lay behind the other.
So if you could move one of the wires to and from the camera,
you could take a series of shots as described by Paul Kline
and see which method still showed the difference when there was 
less difference.  This would be an easy one to do a double
blind test with if there were enough participating experimenters.
The nice thing about it is that it's quantitative: the jack screw
that moves one of the wires to and from the camera can be calibrated 
(can you tell I'm taking this from Paul?).

Comments, Bill?  See any flaws?  I think I could build such a thing
if someone like Paul (who has access to his iris) wanted to use it
and if Jim C thought it was valid and if Bill and Paul thought it
was valid.

John B


------------------------------