🚀 go-pugleaf

In article <1992Apr8.095211.5840@bsu-ucs.uucp> 00mjstum@bsu-ucs.uucp (Matthew J. Stum) writes:
>Does anyone have an algorithm for generating the random-dot stereograms
>as seen in the April issue of GAMES Magazine?
>
>thanx...
>
>-- 
>Matt Stum                                      /             SCA:

Well, I don't have the article from GAMES magazine, but I did take a
class in computer vision, which talked about random-dot sterograms.
So I dug out my vision book, and the way the book describes it as:

For the left-eye image:  Start with a completely white background.
Generate a series of random (x,y) points and plot them in black.
Do this until the white background is well-covered.  

For the right-eye image: Copy the exact image as the left-eye
image, then copy the bitmap of a small square image from the center
of the square.  Now copy the bitmap slightly offset some small number
of pixels back onto the right-eye image (displace it slightly).

Now, if the images are binoculary fused together, you will get the
sensation that the small square is 'floating' in front of the background.

I took this from __VISION: A Computational Investigation into
the Human Representation and Processing of Visual Information__
by David Marr, (Freeman and Company, Publishers)

You might also want to check out the work by a vision researcher 
named Bela Julesz.  He did a lot of work with random-dot
stereograms.

Mike