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'Marker-less' refers to the lack of [[fiducial markers]] used in this type of tracking, while 'Inside-Out' refers to the method by which data is gathered for the tracking.
[[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 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.
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' system, the tracking camera is placed within the item being tracked (for our purposes, like a [[VR HMDsVirtual_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' 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.