35
Figure 4.8: Calibration pattern too small
Suitable calibration pattern Calibration pattern too large
Figure 4.7: ”Calibration“ menu
Figure 4.6: Setting up the glass calibration panels
10 Fasten all screws (projector, camera and camera slide), so that nothing can be displaced from now on.
The camera lens dials can be xed with their locking screws (C). The scanner is now optimized for your ob-
ject (size of the scanning area, working distance, brightness of the object) and must be calibrated like this.
4.2. Menu ”Calibration“: Calibration of Camera and Projector
1. Now set up the calibration corner. You will need both
90° xing brackets and the glass calibration panels. Put
one xing bracket at on the used surface (e.g. a table).
Insert the glass calibration panels in the fixing bracket.
Finally, attach the second fixing bracket on the glass
calibration panels (Fig. 4.6). Attention: Please take note
of our safety advices in Chapter 1.2.
2. Choose the calibration pattern whose size fits to the
scanned object. The pattern should be slightly larger than
the object/region to be scanned (Fig 4.8). For object
sizes above ca. 200 mm, use the large 240-mm pattern
on the back.
For starters, the pattern should be folded inwards (Fig. 4.8).
Advanced users can avoid undesired reections with an
outwardly folded pattern if necessary. Fix the glass calib-
ration panels using the two xing brackets to exactly 90°.
3. Remove the object and set up the glass calibration panels and the scanner in front of each other, about
the same distance as the object previously, so that the projection and camera image are sharp. Camera and
projector should not look at a too at angle at the calibration panels. The camera image should show the
projected pattern as large as possible. In addition, the 6-rings and several other points of the calibration
pattern must be visible. The entire camera image should be filled with about 15 to 70 calibration markers,
the camera should not be able to look aside the glass calibration panels. You can achieve this by moving
the scanner and tilting or adjusting the tripod, but you should not change anything above the red base rail.
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