Chapter 9
9.8 Calibration
What does ’scaling factor’ mean?
Performing a room calibration results in a certain scaling error. This might be a problem
when applications do have very high accuracy requirements (e.g. when performing mea-
surements with the Measurement Tool ).
The scaling error can be determined, for instance, by measuring points on a defined
scale (e.g. tape measure). The determined scaling error can thus be adjusted with the
DTrack2 ’scaling factor’ (refer to chapter B.1.1.1 on page 250).
Please contact ART if you require further information.
I cannot calibrate my target.
• Please check if the markers of the target are seen by the cameras in good quality
(i.e. at least yellow) - a slight change of the target position might help. If necessary
increase the flash intensities of the cameras. Therefore, go to Settings → Cameras.
• Make sure that when starting the body calibration every marker of the target is visible
to the cameras.
• A body calibration can be carried out only if a valid room calibration has been carried
out before. Check in the Event Display if there is a warning saying ’no valid room
calibration’, additionally the button Calibrate is greyed out and cannot be clicked.
In that case, please carry out a new room calibration.
• Please make sure using the Monitor 2DOF display that no marker is overlapped
(i.e. merged) by another one. If necessary rearrange the target and restart the body
calibration.
• Try to carry out the body calibration with a moving target. Therefore, shift the starting
position of the target for calibration (often a shift of 10 or 20cm is enough to enable
calibration again).
• Make sure that no other markers or targets are inside the tracking volume other than
the one you want to calibrate.
• Please carry out a new room calibration.
I’d like to save all my body files for backup reasons but I receive less files than
configured bodies.
DTrack2 only creates body files for calibrated bodies. For example: if you configured 15
targets for tracking but only 4 of them are calibrated, you will only receive 4 calibration
files.
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