8 DTrack2 frontend software
Action Description
Zero point offset
[mm]
translate the room coordinate system along its axes in steps of
1mm
Reset vector reset the zero point offset to the unmodified state (0.00 mm)
Rotation angles
[deg]
rotate the room coordinate system around its axes (from -180 to
+180
◦
)
Reset angles reset the rotation angles to the unmodified state (0.00
◦
)
Scaling factor enlarge / shrink the room coordinate system uniformly by a factor
of +/-5 percent
Reset scaling reset the scaling factor to the unmodified state (1.0000)
Start start up a module for transforming & matching to a reference co-
ordinate system (Measurement Tool & license provided)
All entered transformation values are relative to the original room coordinate system, i.e.
in a standard coordinate system (xy plane on the ground, z axis facing upwards) the origin
is placed 42mm above the ground (due to height of calibration angle + radius of spherical
marker). If the new desired origin is to be placed 1 m above the ground, then the Zero
point offset for z is 958mm (1000 mm - 42 mm).
8.6.4.1 Transform the room coordinate system
Press Start in the Fine tab to open the room matching dialogue (see figure 8.29 on page
175). This functionality depends on the Measurement Tool license.
i
If the Measurement Tool is not tracked (calibration provided) matching
cannot be performed. Use an authorised Measurement Tool by ART for
best results.
Z
Deselect any previously assigned Measurement Tool References prior
to matching of the coordinate systems. Otherwise matching results
will be erroneous.
The purpose of the coordinate transformation is to convert the origin and orientation of the
initial camera coordinate system (indicated with ’O’) into a reference coordinate system
(indicated with ’T’), e.g. given by a certain object or CAD model. All measurement data
will be transformed with respect to the reference coordinate system (’T’). To this end a
three-step calibration procedure has to be performed:
1. Add measurement data from the reference coordinate system (’T’) by manually en-
tering the coordinates into the table reference points using the button Add. A mini-
mum of three (3) data points is necessary for calculations. Delete single data points
by selecting the corresponding row and press Remove. Alternatively load the coor-
dinates from a text file (ASCII) using the button Load. The text file must comply to
the following format:
1 1.00 20.00 300.00 <CRLF>
2 4.00 50.00 600.00 <CRLF>
3 7.00 80.00 900.00 <CRLF>
# x y z <CRLF>
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