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8. Troubleshooting
(*) Requires recalibration
Other possible problems and their solutions can be found on our website in the FAQ:
http://www.david-3d.com
8.1. Problems with the Scan Quality
Cause / SolutionsProblem
Adjust the camera aperture (f-stop) so that the red intensity curves are well-
adjusted and not being cropped. (*)
Make sure that the resolution of the projector is set correct. It should be set to
the native resolution, usually 1280 * 800 pixels. (*)
Make sure that the red intensity curves are neither overdriven nor too weak.
Flattened sine waves cause waves in the scan. (*)
Set the projector‘s brightness to maximum.
Make sure in the projector‘s menu that the keystone correction is off: Set the
manual value to zero and deactivate the automatic. (*)
Reduce the ambient light. Avoid uorescent lights and all ickering light
sources.
During the scan, nothing is allowed to move (scanner, object). A scanned per-
son should lean against sth. as comfortably as possible, and hold their breath.
Increase the camera angle (at least 20°) and the distance between the camera
and projector. (*)
Make sure that in the projector‘s menu, all filters are adjusted to neutral
(default values) and no articial contrast enhancement, etc. is active. (*)
Set the value ”Gain“ in the camera properties to minimum (*)
On shiny objects, direct reections of the light projector in the camera should
be avoided. The object must be matted with spray if necessary. We recom-
mend our Coating Spray, order number: COATING-SPRAY-500
Make sure that the camera image does not icker, meaning that the exposure
time of the camera ts to the frame rate of the projector (usually 60 Hz and
1/60s).
Select pattern parameter ”Default“ or better ”Quality“.
Reduce the ambient light.
The scans are noisy (rough surfaces)
The scans show strip-shaped
distortions
The scans show a regular wave
pattern
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