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PIL - More In-depth descriptions of the ImageFilters?

I've been working on a project with images, and a small part of it was finding a best way to filter the edges. So for the presentation, I wanted to include more indepth information. However, the python imaging handbook does nothing more than simply list off the filters. Is there any source that explains the algorithms and math behind the filters? Thanks.

This stackoverflow question is probably a good place to start. It has a link to the general algorithm (kernel convolution) and info about how to find the parameters for each particular filter.

http://effbot.org/imagingbook/pil-index.htm