1.3 Thesis structure
HiBall Tracker 
Fast accurate tracker that was developed at the University of North Carolina at Chapel Hill. Uses photo diodes and LEDs to estimate pose.
Low latency, 2000 Hz update rate, Better than 0.2 mm positional precision and better than 0.01 degrees angular precision.
Industrial Research LTD.
Prototype system. Not currently in production.
Indoor and outdoor use.
Laser Bird 
Designed for head and object tracking in medical and 3D visualisation applications.
Laser tracking technology.
OPTOTR K PRO 
Optical laser tracker for making point coordinate measurements.
Laser tracking technology, 3DOF.
Phoenix Technolo- gies Inc.
body motion capture system using LED markers.
0.5mm accuracy, 512 markers, 190 cubic metres tracking volume, 3DOF
Table 1.1 A non-exhaustive list of optical tracking systems.
tracking system using custom cameras that observe the
positions of reflective spheres by using pulse of
Tracks multiple objects, 3 DOF or 6 DOF.