Reference List

Use the Reference options to indicate whether or not to update the reference at each frame.

Fixed

Leaves the contents of the reference box unchanged during tracking. This is faster than Roaming. It is also less flexible since it assumes little or no change to the reference feature.

Roaming

Updates the contents of the reference box at each frame. Use this option when the reference feature undergoes significant changes in luma or shape cues during the clip. For example, if the reference feature undergoes lighting changes, choosing Roaming increases the chances of finding a match at each frame.

Roaming is slower than Fixed since the reference box must be updated at each frame.

Note: Results are often not as accurate with Roaming because very small errors in the analysis are compounded.