Object detection

[Zachary Pincus]

> I'd love to be able to solve Siggi's problem--this is exactly the
> kinds of things our toolbox should be able to address.

Is there a template matching module? That'd be a good wish-list item for a simple cython implementation. (Convolution is easy, but sum-of-[absolute|squared]-differences can't be done through convolution alone, right? Or am I being daft?)

Zach