Andy's SIS Collection:

SISs (Single Image Stereograms) have always been fascinating to me as a visual scientist. So one day I decided to find out what their secret was and started to play around with random dots. The result of that is a very simple program that takes a depth map (in the form of a grey level image) and any background you like, and converts them into a SIS.

If you wish, have a look at a few examples below. Jump here if you are only interested in the final stage. For more stereograms and a lot of information on them check out Skal's SIS page or Gareth and Peter's SIRDS pages and the many links provided there. Heidrun's collection is quite extensive too.
[None of these sites are around any more, but today Wikipedia would be a good starting point.]

If you don't know how to see anything in Single Image Stereograms, have a look at the SIS viewing instructions.

If you have any comments or suggestions, feel free to send me an e-mail.

Andrew Giger

      	SIS Menu
  Click at a number in the picture above or choose from the menu:  

  1- Modified CVS logo  
  2- Unofficial RSBS logo (Research School of Biological Sciences)
  3- Danger, bees!
  4- Gabor 
  5- Maze; Find your way from the upper left to the lower right corner...
  6- Escher's lizards
  7- Escher's lizards on paper texture
  8- Escher's lizards with superimposed SIM (Single Image Monogram)

I have also written a program that produces ASCII-Stereograms or SIRTS (Single Image Random Text Stereograms). They have the advantage that you don't need a graphical interface to appreciate them. Text stereograms are also very easy to analyse, if you are interested in the mechanism of SISs.

Note that ASCII-Stereograms only work with a fixed-width font (eg. Courier). Here are a few examples:

       A         BBBBBBB          CCCCC       DDDDDDD       EEEEEEEE     
      AAA        BBB  BBB       CCC   CCC     DDD   DDD     EEE          
     AA AA       BBBBBBBB       CCC           DDD   DDD     EEEEEE       
    AAAAAAA      BBB   BBB      CCC   CCC     DDD   DDD     EEE          

  A- Centre for Visual Sciences (commented)
  B- Steps (commented)
  C- Happy Birthday!
  D- Landscape 
  E- Affenschwanz

And then, finally, I worked out how to get rid of the discrete steps in depth, so the last few examples are grey scale images with nice, smooth surfaces. They are a bit boring in terms of composition and content; I just had to know that I can do it. Unfortunately I don't have the time for more...

  10- Gabor again...
  11- Cube
  12- Smooth Cross
  13- Christmas tree (two superimposed SISs)

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