You've now started to see computer vision in Chapter 13, Robot Vision - Using a Pi Camera and OpenCV. We used OpenCV to track colored objects and faces, but barely scratched the surface of computer vision.
Finding more information on computer vision
Books
To continue learning OpenCV, I recommend the book OpenCV with Python By Example by Prateek Joshi, Packt Publishing. This uses computer vision to build augmented reality tools, and to identify and track objects, and takes you through different image transformations and checks, showing screenshots for each of them. It is also quite fun with lots of hands-on code.
Computer vision can be extended to 3D computer vision with the Kinect, which are tricky to find as they are...
