Keith's Stereogram FAQ
You can pick up my stereogram package. Either just
download it or if you'd rather, you can browse
the directory.
The package contains source code for a program called "absird", which
will make a stereogram from a depth image. In order to
compile it, you'll need the IJG jpeg libraries, available at
ftp.uu.net,
or you'll have to write image read & write routines yourself.
A depth image is an image where the brightness of each pixel
represents how far the image is from the viewer. Most
renderers can create them. I include some in my package.
Without a renderer, it is nearly impossible to make them.
The programs uses random dots or a user-supplied tile pattern
and repeats it across the screen. The viewer looks "into"
the screen, so that each eye is looking at a different part
of the pattern. The left eye sees one "tile" to the left of
what the right eye sees. The distance between these two
points on the screen determines how far "into" the screen the
stereogram appears. The closer they are together, the closer
to the viewer they appear.
I only have compiled in on an SGI running UNIX. If you port
it to another (non-Microsoft) platform, I would like to know
about it. It should not be hard to port.
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