Wanted: Contouring algorithm

[Michael G. Brown]

Greetings and salutations.

THE PROJECT:
I am working on an image processing package, currently running on a
SparcStation 1 under SunOS 4.0. The package currently uses X windows as a
display medium, but we are trying to make the entire package independent of any
operating or graphics system.

THE DATA STRUCTURE:
Our images are stored in a custom format, which we access through a memory
paging system on an individual pixel, or complete row basis. Each pixel can
represent either an integer or floating point quantity.

THE PROBLEM:
We need to have a method for presenting the images as contour maps of various
intensity levels. Rather than re-inventing the wheel, I thought someone may have
developed the required algorithms in the past. Ifyou have done this, I would
greatly appreciate it if you could mail me your code, or any references you used
or anything! I do not expect to be able to use the code straight as it comes,
but a little modification will be better than starting from scratch. We do
require the package to generate fairly smooth contours.

If you can help, I would be most appreciative.
--
Michael G. Brown         | mgb at geo.geol.utas.edu.au | "And because, in all the 
Department of Geography  |    mgb at gnu.ai.mit.edu    | Galaxy, they had found
University of Tasmania   |                          | nothing more precious than
GPO Box 252C, Hobart     |      Live and Direct!    | mind, they encouraged its