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DAVID-Laserscanner Forum • View topic - Scanning of calibration panel
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Scanning of calibration panel

The place for questions, problems, comments and tips regarding the camera calibration.

Re: Scanning of calibration panel

Postby MagWeb » Wed Dec 11, 2013 2:12 am

:? I 'd say: You did a good job! And: Thanks!

The lower the frequency the better you can get cavities - this fits to my experience.
But your results made me wonder too:
Your frequency5 result @ 800*600 shows 2 directions of waves. What the hell causes this second direction at a lower frequency (I saw this before here too, but didn`t care about)? I'm not through yet...seems to be another problem of balance...
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Re: Scanning of calibration panel

Postby Sven » Wed Dec 11, 2013 11:30 am

Thank you, argo and Gunter, for your constructive dialog!

Yes, it can always be difficult to use "other" hardware that has not been tested/recommended. The camera resolution is often important. You never know what they do inside the camera...
In earlier days, for laserscanning, we often found that the best resolutions are the native chip resolution or exactly half. Seems to be the same here (1280*720 is native, 960*720 probably just cuts left+right off).

The other important topic is frame rate, but it seems you two have solved that quickly. :D

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Re: Scanning of calibration panel

Postby argo » Wed Dec 11, 2013 12:47 pm

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Re: Scanning of calibration panel

Postby Sven » Wed Dec 11, 2013 1:06 pm

Frequencies: Please disable "AutoFrequencies" directly above "Frequencies".
Scale: Of course that's the scale of the calibration panel. See manual. http://wiki.david-3d.com/david3_user_manual/overview
Image
For a 200 mm object, the 240mm calibration panel should be fine.
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Re: Scanning of calibration panel

Postby argo » Wed Dec 11, 2013 2:42 pm

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Re: Scanning of calibration panel

Postby MagWeb » Wed Dec 11, 2013 3:42 pm

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Re: Scanning of calibration panel

Postby argo » Wed Dec 11, 2013 7:21 pm

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Re: Scanning of calibration panel

Postby MagWeb » Thu Dec 12, 2013 3:47 am

What's the current parameter at AdvanceSettings/Calibration/ExpectedPatternsOffset (or named similar... I'm of my PC atm...default is about 15, if I remember right)? If your pattern's offset is equal zero you should set zero instead.
As said, just a guess.

Other things tomorrow...
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