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Tracking systems that make use of a camera may be organized into two main branches, 'inside-out' and 'outside-in' tracking. Both terms refer to the placement of the tracking camera itself, with reference to what it is tracking.
In an [[inside-out tracking|'inside-out' system]], the tracking camera is placed within the item being tracked (for our purposes, like a [[Virtual_Reality#Devices|head mounted display]]), from which vantage point it look ''out'' at the world around it. It uses its changing perspective on the outside world to note changes in position.
In an [[outside-in tracking|'outside-in' system]], a tracking camera is (or cameras are) placed around the space within which the tracked object will move, and use their changing view of the object itself to measure its changes in position.
==Relative Merits==
