The first step in creating a matchmove is to identify important features in the image with special markers, or tracks, in a process known as 2D tracking. These markers are used to calculate the camera’s motion and the overall three-dimensional layout of the scene.
2D tracks enable matchmoving programs to know what’s going on in the scene. These tracks serve as the two-dimensional clues that help us to re-create the three-dimensional scene. In this chapter, I’ll show you how 2D tracking works, how to create accurate tracks, and what effect tracking has on calibration.