Re: Stereograms

Stereograms (And the program for them)
Douwnload the program at: http://paul.spu.edu/~pvenable/stereo.html
--
        The principle behind stereograms is that (for the parallel
technique) for any series of horizontally repeated objects, any pair which
is closer to each otherthan the rest will result in an object
which appears closer than the rest.  (brief explanation of parallel
technique vs. crosseyed:  Most people use the parallel technique, whether
they know it or not.  This involves moving your focal length behind the
surface of the stereogram so that your right eye views a series of
repeated objects to the right and your left eye views a series of object 
on the left.  Since the series are so similar, your brain superimposes 
them into one image.  Any dicrepancies between the two are interpreted into 
depth.  Crosseyed is the same exact thing in reverse.  You move your 
focal point in front of the screen so that your right eye views a series 
to the left and your left eye views a series to the right.  This inverts 
the depth of the picture.  Background becomes foreground and vice-versa.)

        Here's a graphic illustration to illustrate:

                             *      *
     X      X      X      X     X     X      X      X      X
     X      X      X      X     X     X      X      X      X
     X      X      X      X     X     X      X      X      X

        Most of the pairs have 6 spaces in between.  Two pairs (three 
columns) only have 5 spaces in between.  Therefore, they appear one level 
closer.  Where 0=background and 1= foreground, this should be what you saw:

     X      X      X      X     X     X      X      X      X
      \    / \    / \    / \   / \   / \    / \    / \    /
       \  /   \  /   \  /   \ /   \ /   \  /   \  /   \  /
 X      0      0      0      1     1     0      0      0      X

        The X's on each end are there because they no pairs to the far 
right and the far left.  This results in an automatic border of nothingness.

        We can apply this same method to a string of characters to get 
greater resolution.  We'll make the string 7 character long to keep the 
focal length the same.  If this is the desired effect,

       000000000000000000000111111111111100000000000000000000
       000000000000000000000111111111111100000000000000000000
       000000000000000000000111111111111100000000000000000000

Then this is how you'd get it:
                         *      *
abcdefgabcdefgabcdefgabcdefgbcdefgbcdefgbbcdefgbbcdefgbbcdefgbbcdefg
abcdefgabcdefgabcdefgabcdefgbcdefgbcdefgbbcdefgbbcdefgbbcdefgbbcdefg
abcdefgabcdefgabcdefgabcdefgbcdefgbcdefgbbcdefgbbcdefgbbcdefgbbcdefg

        What happened is that the first time the "a" disappeared, the 6
letters following all became 1 space closer to their pairs on the left. 
This changes the focal length and creates foreground.  Continuing this 
process and returning to the background level becomes a
little more complex.  Another way to explain it is that after the first
string is printed, a character is repeated for however long the string is.
Since this string is 7 chars long, the program prints whatever char it
printed 7 chars ago.  This continues until we reach the foreground: 6
chars. This is why the "a" disappeared.  The char that had to be repeated
(6 ago) was a "b".  When we reached the end of the foreground, the program
looks back 7 again instead of 6.  This is why the "b" ends up being
repeated in the backgroung on the right.
        This same concept of repeated chars can theoretically be applied to any 
number of focal lengths, although most eyes have trouble seeing more than 2.
        I think that pretty much explains it.  If you have any questions, 
(as I might have assumed a few things that need to be explained) just 
drop me a line.  BTW, where is sckcen.be?  Also, I'd like to see what you 
come up with after you finish, if that's not to much trouble.   Later,

      *********** Carl Schenkenberger * csc...@libby.org **********
      *     o  \ o / _ o      __|   \ /    |__      o _ \ o /  o    *
      *    /|\   |    /\  __\o  \o   |   o/   o/__  /\    |   /|\   *
      *    / \  / \  | \ /) |   (\  /o\  /)   |  (\ / |  / \  / \   *
      * 1204 Montana Ave. * Libby, Montana * 59923 * (406) 293-3518 *

EXAMPLE:


focal 6
width 40
height 16
strings 5
peterv
enable
carlsc
henken
berger
........................................
........................................
........................................
........................................
.............1111111111.................
..........1111111111111111..............
........11111111111111111111............
.......11111...111111...11111...........
......111111...111111...111111..........
......111111111111111111111111..........
......111111111111111111111111..........
.......11111....1111.....11111..........
........11111..........11111............
..........1111111111111111..............
.............1111111111.................
........................................

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