User manual

2.2 Capture and alignment 29
• Optical Setup: allows to return to the physical configuration of the scanner (ref. 2.1.1).
• Batch Turn Table 3D Scan : allows to perform multiple acquisitions through a single scan command;
the object will be automatically oriented by the turn table;
• Turn Table Calibration : allows to calibrate the turn table rotation axis, enabling the option to
automatically align the scans.
(a)
(b)
(c)
Figure 2.20: Scan panel: (a) single 3D Scan with Turn Table, (b) multiple 3D Scan with Turn Table, (c) Calibration of
the Turn Table.
IDEA also allows to operate with an uncalibrated turn table. This is the case, for example, during the first use
of the turn table, every time the turn table is moved from the position at which it was originally calibrated, or
if the scanner is moved. In such cases it is possible to perform both single as well as multiple scans, however
losing the automatic alignment of the scans. Therefore, to fully exploit the automatic alignment option, it is
advisable to perform the turn table calibration by choosing said option in the combo-box of the scan panel
(Figure 2.20.(c)) and proceeding as follows:
1. Choice of the framing : place the object on the turn table and frame it with the scanner at the correct
working distance;
2. positioning of the calibration plate : remove the object and place the calibration plate on the turn
table; if the scanner frames the turn table at an angle greater than 30 ° the plate must be laid on the turn
table plate, otherwise the calibration plate must be mounted upon its support so that it can be properly
framed by the scanner; in fact it is important that the small black circular markers of the calibration
plate are adequately framed by the scanner;
3. axis calibration : press the button axis calibration and wait that the procedure is completed; IDEA
will signal either a positive or negative outcome; in the first case it is possible to proceed to the scan
phases. In the second case it is necessary to make sure that no error has been committed and the
procedure must be repeated.
Once this calibration phase is completed, IDEA gets automatically configurated in Batch Turn Table 3D
Scan mode, the scan panel is shown as in Figure 2.20.(c) and the alignment mode is set to calibrated axes
alignment (ref. 1.1.3.2).
In this mode on the right part of the panel it is possible to specify:
• the total number of steps, that is the number of desired scans to be performed; the default value is 8;
• the start and end angular position; the predefined values define a trajectory between 0° and 360°.
Pressing the button 3D Scan the multiple scan procedure is launched, which will orient the object in front of
the scanner and provide a scan result aligned in an automatic manner as in Figure 2.21.
It is always possible to activate the single scan acquisition mode: in this mode to the scan panel (Fig-
ure 2.20.(a)) already described in 2.2.1 a knob is added that regulates the rotation angle of the turn table:
by acting upon it, it is possible to manually specify the angular position to orient the object in front of the
scanner to perform single scans, which shall be automatically aligned.