Stereograms


While learning how to see the 3-D effect in stereograms, I figured out the way to create them. I wrote a Pascal program over the summer of 1994, generating quite a few nice stereograms. Here are some of them for your viewing pleasure:

How to see

 To see the 3-D effect, you should try to diverge your eyes more than what you normally do. When we look at near objects, we tend to converge our eyes so that both of them see more or less the same things. However, when we look at far objects, both eyes would be looking in the same direction (this is what I call diverging the eyes). Therefore, the trick is to relax and imagine that you're looking at a far object when viewing a stereogram.

Try this:

  1. Move your eyes close to the stereogram so that you can't focus on it at all. Relax your eyes, don't try to focus.
  2. Remember the relaxed feeling.
  3. Now, move the stereogram away from your eyes slowly and maintain the position of your eyes.
  4. Move until you see the 3-D effect. If you can see the stereogram clearly and there is no 3-D effect, try the whole process again.
Most people require some time to master the technique. So keep trying until you succeed! :)

Generating your own stereograms

For those programmers out there who would like to learn to generate stereograms, try getting the book - Stereogram Programming Techniques by Christopher Watkins and Vincent P. Mallette. I've contributed some algorithms and programs.

WWW sites with stereograms

Home Page: http://home.pacific.net.sg/~changkai/
Email: changkai@alum.mit.edu
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since 28 Dec 97
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