 The idea of a computer being able to see is no longer science fiction. There are good methods available for recognizing where a face is in an image, or even who it might be. Recognizing where objects are in a scene makes it possible to navigate vehicles without bumping into anything. And that's especially important for things like wheelchairs, robots, or even a self-driving car. Analyzing objects enables a system to detect interesting features, such as the quality of fruit being packed. Or even a tumour in a medical scan. In this chapter, you'll look at computer vision methods for things like finding the edges around objects, recognizing faces, recognizing characters, and tracking objects moving through a scene.