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Calibration marks showing in the scan results

Questions, problems, comments and tips regarding the 3d scanning process.

Calibration marks showing in the scan results

Postby Seb Pelan » Sat Feb 10, 2007 5:18 pm

Hello!

First of all, thanks! You did a great job, and the new site is great.

Now, I have some trouble with scanning. I tried several combinations of positions, camera exposure, gain and iris settings, but none seems to help: While I scan, calibration marks are not reflecting the light and they show up during scanning as part of the scanned object. The result is a really "dirty" scan. The fun thing is that they didn't use to show up until today... Any hints on avoiding them?

Thanks!

Seb
Seb Pelan
 
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Location: Koper, Slovenia

Postby Simon » Sat Feb 10, 2007 5:51 pm

Hello Seb,

what do you mean with "they didn't use to show up until today"? Did it work with an older version of DAVID?
It would be of great help if you post/attach some jpg-screenshots:
1) A screenshot of the live camera window with visible laser line passing a calibration mark (in pause mode with black background).
2) A screenshot of your depth image after scanning.

Thanks
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Postby Seb Pelan » Sat Feb 10, 2007 7:23 pm

Hmm, I'm not sure if it's because of the upgrade, but actually, I didn't notice them in the previous version.

I'll get you the screenshots in a few minutes, so you'll see :)

BTW, I wrote you an e-mail a few days ago, did you get it?

Seb
Seb Pelan
 
Posts: 4
Joined: Sat Feb 10, 2007 5:14 pm
Location: Koper, Slovenia

Postby Seb Pelan » Sat Feb 10, 2007 7:46 pm

Here, I uploaded the images on my server.

Image
The object I'm scanning

Image
Image showing the "dark" spots that cause the problem

Image
During scanning...

Image
Results

Image
Raw mesh (DAVID 3D window)

That's it :)

Seb
Seb Pelan
 
Posts: 4
Joined: Sat Feb 10, 2007 5:14 pm
Location: Koper, Slovenia

Postby Simon » Sat Feb 10, 2007 8:41 pm

I guess that your calibration is not accurate enough. Normally DAVID suppresses all 3d data points in the background. In other words the numerous points at the backround planes shouldn't be there.

Please check your calibration corner:
Do you have an exact angle of 90 degree (at the top and bottom)?
Is the printed pattern totally flat?
Is the gray coordinate system in the corner adjusted correctly (see manual)?
Then recalibrate the camera by pressing the calibration button.
Are the red crosses exactly in the center of the markers?
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Postby macouno » Tue Feb 13, 2007 4:04 pm

I expect that the room may be too bright? That way the contrast between white paper and the laser reflected on black is not high enough.
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Postby rh3d » Tue Mar 06, 2007 5:41 pm

I had this same problem. To resolve it on my end I only did two slow, very slow, sweeps witht the laser from top to bottom and back to the top. As soon as I start doing more sweeps with the laser my calibration dots start showing up in the scan.
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