Chapter 8
8.6 Menu Calibration
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DTrack2 compares the geometry of the physical target with the calibra-
tion data of the target library. In some cases a re-calibration might be
necessary, e.g. when a clip-on target is applied to the glasses bending
is possible.
If you haven’t increased the number of targets before the system will ask you if this number
should be adjusted automatically. Press ’OK ’ if you want the system to do so.
Typical usecase: Motion Capture targets without Inertial sensors For this descrip-
tion we’re assuming that a room calibration for eight cameras has already been carried
out and that the "full-featured" or "max. 8 cameras" license is available.
First, fit the targets to the test person and make sure that the person is in the calibrated
volume. Then, start the calibration (Calibration → Body → ’Target Library’ → ’Calibrate’)
and allow the test person to move around. While this movement the targets must be visi-
ble for the tracking system.
Finally, one after the other target should be recognized and appear in the display. Tick the
checkbox ’accept all’ and start the measurement in order for your application to receive
tracking data.
In case you need to adjust the order of the targets please go to Settings → Body Admin-
istration (F8).
8.6.6 Body adjustment
The Body adjustment function is a tool to visualise and manipulate calibration data of rigid
bodies, i.e. the body coordinate system may be changed relative to the markers of the
body. Just select the desired body from the drop-down list at the top of the window (see
figure 8.36 on page 184).
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Body adjustment is not available for 5DOF targets or measurement
tools.
The main features of Body adjustment are:
• adjust the body coordinate system of each target within the DTrack2 frontend,
• online mode (i.e. the 3D-representation of the target in the ’Graphic view’ is depict-
ing movements / rotation of the target in the "real world"),
• visualise (optionally) predefined emission cones due to restrictions of visibility (di-
rectional and angular dependence) for all markers
• aligning the axes of body and room coordinate system without changing the origin,
• use predefined body coordinate systems,
• move the origin of the body coordinate system,
• set the origin of the body coordinate system in a selected marker,
• delete selected markers from the target geometry.
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