9. CONFIGURATION
Figure 22: Example calibration frame with detected calibration board.
minutes to complete. If calibration is successful then you are immediately
redirected to the `review calibration' page.
Calibration will fail if the computed vertical or horizontal pixel displace-
ment exceeds the allowed range of
[
−
39
,
+39]
pixels for any image point. The
most common causes for calibration failures are:
•
Insucient number of calibration frames.
•
Improperly aligned cameras. See Section 7.5.
•
Lenses with strong geometric distortions.
•
Lenses with unequal focal lengths.
•
Improper camera synchronization.
•
Frames with calibration board misdetections.
Should calibration fail, then please resolve the cause of error and repeat the
calibration process. If the cause of error is one or more erroneous calibration
frames, then you can delete those frames and re-press the calibrate button.
Likewise, in case of too few calibration frames, you can record additional frames
and restart the calibration computation.
9.10 Reviewing Calibration Results
Once calibration has been performed, you can inspect the calibration results
on the `review calibration' page, which is shown in Figure 23. On the top of this
page you can see a live preview of both cameras as they are rectied with the
current calibration parameters. Please make sure that corresponding points in
the images of both cameras have an identical vertical coordinate.
By activating the `display epipolar lines' option, you can overlay a set of
horizontal lines on both camera images. This allows for an easy evaluation of
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