The radon transform code written by Pieter works well, but currently depends on PIL. I've added "fast_homography" to scikits.image.transform:
The idea is to eventually replace scikits.image.transform.homography by fast_homography. With the new function in place, the radon transform code can run without using PIL:
As a bonus, the results are also more accurate, because we don't convert to uint8 afterwards.
Please review! We're making good progress to the release; thanks to everyone who has helped out so far.