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High res Calibration

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

High res Calibration

Postby hnphan » Fri Oct 08, 2010 12:32 pm

I wanted to try to scan a very high resolution object with 18 MP image. I was only able to use images up to 2400x1500 before it says "Calibration failed". Is there anyway to calibrate with bigger images?
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Re: High res Calibration

Postby MagWeb » Fri Oct 08, 2010 1:37 pm

Hi,

if I remember right:
There is a upper and a lower limit in size of the markers (size in pixel x pixel).
I can imagine that a high res image marker owns more pixels than the upper limit.

Give it a try and draw a pattern with smaller markers, but equal distances.... or increase distance to the corner (which makes the points appeare smaller...

but I never tried that.
On such a high resolution, you will get giant filesizes....

Gunter
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Re: High res Calibration

Postby hnphan » Sat Oct 09, 2010 2:32 am

oh ok.. so theres no value I can change so it checks further pixels?
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Re: High res Calibration

Postby Sven » Mon Oct 11, 2010 1:52 pm

Please post or send me the calibration image, so I can see why it fails.
Thanks
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Re: High res Calibration

Postby hnphan » Wed Oct 13, 2010 3:06 am

I sent u an email :)
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Re: High res Calibration

Postby MagWeb » Wed Oct 13, 2010 8:10 am

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Re: High res Calibration

Postby Sven » Wed Oct 13, 2010 3:26 pm

Thanks. The problem is that DAVID finds more rings than there are. The image has such a high resolution, but of course some noise, and DAVID found rings and circular markers in the noise... I have improved that.
Still I'm not sure if such a high resolution is really necessary, especially when your projector has "only" 2 megapixel or similar.

Please also note that your calibration is not ideal: The panels and pattern should spread over the whole image, the borders of the panels should not be visible...
Your image vs. ideal image:
Smal_work.jpg
Image

The fix will be in DAVID 2.6 which we will release shortly.
EDIT: 2.6 is released. http://www.david-laserscanner.com/?section=Downloads

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Re: High res Calibration

Postby hnphan » Wed Oct 13, 2010 11:38 pm

thank you! I will try what you suggested. I did notice some improvements when using the 2500x1600 image scan compared to a smaller image that's why I wanted to try even bigger image scan.
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Re: High res Calibration

Postby hnphan » Thu Oct 14, 2010 12:52 am

wow it works @ 4500 x 3000! of course it crashes at higher res but I doubt ill need anything bigger then that :shock:

thanks a bunch!
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