
4
ART
Tracking Cameras
create a virtual "point cloud" in the measurement volume that is used for calculating the
relative positions of the IR cameras with high accuracy. Furthermore, the wand is scaling
the system. That’s why damages of the wand (loose markers, bent poles, etc.) lead to
miscalculations of the measurement volume.
Figure 4.14: A room calibration set consisting of angle and wand
Room calibration process
At least two IR cameras have to see all markers of the
calibration angle while the two markers of the wand should be visible to all IR cameras
as good as possible. Move the wand gently in all possible directions (up/down, left/reft,
back/forth) and additionaly rotate it within the measurement volume in order to generate
a virtual point cloud (see figure 4.15 on page 52). If possible, try to walk around to max-
imize the point cloud in all dimensions. It is used for calculation of IR cameras positions,
so moving the wand in only a very small volume will result in reduced accuracy of calibra-
tion. Also avoid quick and jerky movements.
Please refer to chapter 8.6.3 on page 166 for further details of the procedure.
Figure 4.15: Room calibration process
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