I need to find the skeleton of a silhouette image for a project I'm working on.  I would love to start with some existing code rather than re-implement skeletonization from scratch. Ideally, I'd want something that takes a black-and-white or greyscale image as input, and returns a topologically-connected graph of lines or curves representing the skeleton. But even just the image-processing part would be a great start.

Any recommendations?