Summary
In this chapter we have built a simple face tracker that can work reasonably in constrained settings using only modest mathematical tools and OpenCV's substantial functionality for basic image processing and linear algebraic operations. Improvements to this simple tracker can be achieved by employing more sophisticated techniques in each of the three components of the tracker: the shape model, the feature detectors, and the fitting algorithm. The modular design of the tracker described in this section should allow these three components to be modified without substantial disruptions to the functionality of the others.
