Hello community!
Why do I have these kind of unwanted ring-shaped artifacts in the raw data? Scanned with revometroy pro, crosslines with turntable and tripod.
HI
Short answer:
The concentric artifacts occur because your stationary scanner and the rotating turntable are not perfectly synchronized. The scanner does not interpret the rotation as a continuous motion, but as a series of slightly shifted individual measurements, which accumulate into circular distortions.
Why do concentric rings appear?
Frame‑to‑frame offset caused by rotation:
The scanner captures many frames per second.
While the object rotates, each frame shows the object in a slightly different position.
- The scanner expects a static scene
- The software tries to stitch the frames together
- The rotation introduces a periodic positional error
→ This produces circular waves / rings in the 3D model.
Rolling‑shutter effect of the camera:
Revopoint scanners use cameras that read the image line by line.
- During the readout, the object continues to rotate
- Each line is captured at a slightly different angle
→ This creates radial distortions, which appear as concentric patterns.
When the object rotates, the angle between laser, camera, and surface constantly changes → the software interprets this as geometry changes.
How you can TRY to void or minimize the concentric rings
Reduce rotation speed significantly
Optimal: 0.5–1 RPM
Slower rotation = less positional shift per frame.
BEST WAY TO AVOID THIS:
Move the scanner ! Laser line modes on Revopoint scanners and optimized for hand scanning. This produces the cleanest results.
The object like yours shouldn’t take a lot time anyway.
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I think Ivan explained exactly the issue here , nothing else to add.
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Thanks a lot to Ivan! Премного благодарен!
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