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DAVID-Laserscanner Forum • View topic - 3.5 update and projector calibration error
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3.5 update and projector calibration error

Discussions about latest DAVID developments, beta versions...

3.5 update and projector calibration error

Postby Rogier van Stapele » Tue Oct 16, 2012 7:20 pm

Hi,

I updated to version 3.5. Newer is better :-)

In previous versions I could do the camera and projector calibration from a set of 27 images (1 for the camera, 26 for the projector). Now the projector calibration results in an error.

As far as I can see the projection images are still the same, so are the settings. What happened?

Rogier.
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Re: 3.5 update and projector calibration error

Postby Sven » Wed Oct 17, 2012 6:32 pm

Hi Rogier,

Whoops! Please go to Settings -> Advanced Settings -> Structured Light and set NoiseReduction to 0.
NoiseReduction does not work with ImageGrabber.

Sorry about this - you could not have known. We'll think of a solution or at least a helpful error message.
Edit 2012-10-18: Problem fixed for next version :D

Please let us know if this solves your problem.

Sven
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Re: 3.5 update and projector calibration error

Postby Rogier van Stapele » Wed Oct 17, 2012 8:05 pm

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Re: 3.5 update and projector calibration error

Postby Sven » Thu Oct 18, 2012 10:57 am

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Re: 3.5 update and projector calibration error

Postby Rogier van Stapele » Thu Oct 18, 2012 3:12 pm

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Re: 3.5 update and projector calibration error

Postby WalterMo » Thu Oct 18, 2012 5:43 pm

Regarding DAVID 3.4.0:

See Sven's first post of Oct 17th:
viewtopic.php?f=15&t=5330&p=24791#p24791

Walter
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Re: 3.5 update and projector calibration error

Postby Rogier van Stapele » Fri Oct 19, 2012 2:17 pm

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Re: 3.5 update and projector calibration error

Postby Sven » Mon Oct 22, 2012 4:52 pm

Hi Rogier,
If you post a link to your SL image sequence, I can test them with the ImageGrabber and try to find out why it does not work with 3.5.
Sven
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Re: 3.5 update and projector calibration error

Postby Rogier van Stapele » Mon Oct 22, 2012 8:20 pm

Hi Sven,

Posting the images didn't work because the zipfile is larger than 2 MB. I'll send them by mail.

I put both the projection images and the captioned images in the zipfile.

Rogier
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Re: 3.5 update and projector calibration error

Postby Sven » Thu Oct 25, 2012 7:43 pm

Hi Rogier,

I have tested your images. I am not sure why your images work in 3.4 and not in 3.5.

However the problem is that your image shows "too much" around the calibration corner. The camera should only see the calibration panels (only the regions where there are markers). You should zoom in, or move camera (and projector) closer to the scene, or use a larger calib-corner. This depends on the size of your object, which should (nearly) fill the camera view and the projection size.

I am sending you new images by mail. They are your images, but I have cut away the borders then scaled back to the same size. Poor quality, just as an example.

Sven
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Re: 3.5 update and projector calibration error

Postby Rogier van Stapele » Fri Oct 26, 2012 10:19 am

Hi Sven,

You are right, there was too much space around the pattern. I assumed that only the space within the square raster mattered and apparantly the previous versions where less critical.

This new knowledge confronts me with a new physical problem because I am scanning very close to the floor, but I'll find a solution for that.

Thanks very much for your help. Btw the new function to save all pattern images at once is very nice, it saves me an hour of pressing print screen and saving.

Rogier.
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