Update

Just posted a new update. Many minor bug fixes in the first 9 chapters or so. I've also worked a bit on the regression chapter - there is an expanded discussion of non-linear regression and I think I've made the sparse regression model a little clearer. I've re-written a lot of the chapter on shape models (probably the weakest chapter, I think). It's still not great but I think it is moving in the correct direction. Thanks to all of the people who have mailed me errata so far!