Re: John!!!

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

John B writes:
>Quoting Allan (?):
> Again, a lens will produce an "out-of-focus" image for things which
> are closer or farther away from the "point" of focus.  SL3D encodes
> this "out-of-focusness" so we can "see" it.  Close things appear
> closer because they are "out-of-focus" in a way that is "different"
> from things which are "out-of-focus" because they are farther away.
> The encoding allows us to translate that into images which are
> apparently shifted left-right so we can "see" the depth illusion.
>
>You can get rid of the "out-of-focus" by stopping down the two 
>apertures from the existing half circles down to smaller circles 
>located where those half circles were.  You will get the exact same 
>effect.

************************  Same effect with a greater efficiency overall.
Next enlarge the two lenses untill they are at the ideal geometry for the
desired parallax in a given scene, and you have the scale at which you would
have to build a single lens if it is to have an equivalent level of Z axis
information. A camera with a single lens the size of a realist camera might
attract a lot of attention! 


>
>> Two lenses take two pictures from two different places.
>> One lens takes one picture from one place.
>
>Ah!  Here is a very simple experiment you can do to prove yourself 
>wrong:  Set up a camera with a ground glass at the film plane.  Cover
>the left half of the lens with a piece of paper.  Look at the view.
>Now move the paper to cover the right half of the lens.  You will easily
>see that this gives you two different views from two different places
>using only one lens that has not been moved.

**************  Proof of parallax in a given aperture. Not as efficient as
two apertures at an ideal stereo base. There's just nothing like two
separate views to match the typical two eyed viewing system.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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

End of PHOTO-3D Digest 1619
***************************
***************************
 Trouble? Send e-mail to 
 wier@xxxxxxxxxxxxxxx 
 To unsubscribe select one of the following,
 place it in the BODY of a message and send it to:
 listserv@xxxxxxxxxxxxxxx 
   unsubscribe photo-3d
   unsubscribe mc68hc11
   unsubscribe overland-trails
   unsubscribe icom
 ***************************