Question : Vectorization algorithm?

I have some raster imagery (already pretty blocky) and I would like to vectorize them.  I am not looking for an application like Corel Trace, etc, but instead the actual algorithms that I can use to clean-up and vectorize a raster image into polygon areas prpgramatically... it can be in teh form of source code or even just a description of the algorithm and process.

Can anyone point me in the right direction?

Thanks,
Jeff

Answer : Vectorization algorithm?

Hierarchical Image-based and Polygon-based Rendering for Large-Scale
Visualizations

http://www.cs.umd.edu/projects/gvil/papers/tahoe00.pdf
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