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[[File:F2Ak4iE.jpg|thumbnail|A room covered in fiducial markers fror inside out tracking, at [[Valve Corporation]]<ref>Youtube, Video: 'Steam Dev Days', on Channel: Valve, Published on Feb 11, 2014</ref>]]
==Marker-less Tracking==
Because of the difficult computations required for a software to interpret live camera input, tracking solutions that rely on cameras sometimes place [[fiducial markers]] (which may look like QR codes), in view of the tracking camera. This gives the software a know known pattern to look for, which makes computation simpler and faster.
Thus the term, 'marker-less' refers to a system that is robust enough that it does not need the aid of printed markers to aid in its interpretation of the three dimensional space.
In an '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==
Both systems have merits; 'inside-out' tracking is notable because it can require no outside equipment, which is ideal for a portable device. Unfortunately, in the case of a headset, it places the burden of computation on the headset itself. (A burden which is exacerbated when no fiducial markers are used.)
'Outside-in' tracking can be less computationally demanding, and can make use of multiple cameras to make results more stable and consistent. This comes in part from the reduced chance of [[occlusion]]. Unfortunately it requires a controlled environment and more extensive equipment.
