A face is a really complex object. To detect and track it, you need to use a new level of algorithms. Fortunately, the JavaScript libraries provide such an opportunity through Haar, Brightness Binary features, Meanshift, and Camshift algorithms. All of them have their own area of usage. You can apply these wonderful methods in different programs, for example, people tagging. We discussed them and provided examples which you can start using right away. In addition to face detection, there is a potential to detect other objects such as face particles. Of course, the detection quality may vary significantly and you should be careful when you use other classifiers.
In this chapter, we already touched on the tracking applications a bit and discussed how the tracking can help to create a human interface. In the next chapter, we will learn how to control your browser with motion and how the object tracking can be used in those applications.