Parallel Tracking and Mapping for Small AR Workspaces - Source Code PTAM (Parallel Tracking and Mapping) is a camera tracking system for augmented reality. It requires no markers, pre-made maps, known templates, or inertial sensors. If you're unfamiliar with PTAM have a look at some videos made with PTAM. Here you may download a reference implementation of PTAM as described in our ISMAR 2007 paper