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DAVID-Laserscanner Forum • View topic - Scanning of calibration panel
Dear DAVID Community,

In 2016, DAVID and this forum have been integrated into HP Inc.
This forum has been read-only since then, and will be switched off by then end of 2019.

To everyone who has contributed here, we thank you for all your work and for the constructive, helpful and friendly atmosphere you have created!
Please continue to discuss on the HP Support Forums.

Scanning of calibration panel

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

Re: Scanning of calibration panel

Postby argo » Thu Dec 05, 2013 12:03 pm

I was wondering why the result of mine is different from other webcam users.
Today i did a comparison between C525, Pro9000, C615 and C600.
Do you think this difference of results is because of the minimum processor speed? only c525 has got the bigger value and the rest of them are all same.

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Re: Scanning of calibration panel

Postby MagWeb » Thu Dec 05, 2013 9:42 pm

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Re: Scanning of calibration panel

Postby hunkatibor2 » Thu Dec 05, 2013 11:39 pm

Hi Gunter
You may not use the software in the same talk.? :roll:
Tibor
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Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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Re: Scanning of calibration panel

Postby argo » Sat Dec 07, 2013 11:54 am

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2013-12-07_14-16-04.png
Horizontal Orientation
2013-12-07_14-16-21.png
Vertical Orientation
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Re: Scanning of calibration panel

Postby argo » Sat Dec 07, 2013 4:28 pm

I think i got the problem but dont know how to solve it.
If i set the orientation to both, i get the same result as if i set it to vertical.
which means the horizontal orientation does not count at all. :roll:
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Re: Scanning of calibration panel

Postby argo » Sat Dec 07, 2013 5:48 pm

whoopee :)

Problem just solved by setting the resolution to 960*720 and only 30fps !!

Thank you so much Gunter for all the help.
I believe this topic and specially your words, could be a great reference for newbies like me.

Best Regard,
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Re: Scanning of calibration panel

Postby MagWeb » Sat Dec 07, 2013 11:55 pm

Hey argo,

this is a awesome result! Be sure, I´m satisfied as you are! Congrats!

Could you do me a favour? Could you post some summarizng essay on the struggle to get things sorted?
Means (just to describe a field of experience):
What were the things you'd expect when you started with DAVID? Frustrations?
Could you describe things that didn`t work as exepted?
What were your attempts that didn´t improve your results?
Which information did you made to keep on trying out things?
Where do you see the final key to get perfect results?
--- Anything that seems to be important for your learning curve.....

For me, it is quite important to understand where possible newbie's preblems are. For me, I learned the way DAVID works along with its growing up. The current power is somehow logical for me. But to give support to someone entering quite now, raises several questions: What does this guy think. expect, try?

If this volunteers forum is able to give good support, developers save some time to give back nice features we all wish to have.
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Re: Scanning of calibration panel

Postby MagWeb » Sun Dec 08, 2013 12:21 am

Just a note to get a meaningfull "Both" orientation:

A setup with a cam above/below or left/right towards the projector does not give a meaningful profile for both projection orientations (horizontal and vertical).
To get a most meaningful setup to use "Both" orientations you should twist one element (either cam or projector) 45° around its central axis (central viewing/projecting axis).
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Re: Scanning of calibration panel

Postby argo » Sun Dec 08, 2013 4:36 pm

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Re: Scanning of calibration panel

Postby argo » Sun Dec 08, 2013 4:40 pm

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Re: Scanning of calibration panel

Postby MagWeb » Sun Dec 08, 2013 6:28 pm

Thanks for taking your time to write down your experiences. I'll try to keep them in mind.

Hm, I'm still trying to understand your break through:
Either (A) your cam simply couldn't get a set to fine frequency or (B) your cam changes its pixelclock depending on the output resolution (which may be possible due to onboard processing limits).
As far as I remember you said you've tried different frequency settings. Did you try also a lower than default frequency?
If yes, the result should have been better then (if A is right)...
I tend to assumption B...
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Re: Scanning of calibration panel

Postby argo » Sun Dec 08, 2013 7:30 pm

Hard to say.
As i said before, i tried all the frequencies from 56-82 but there was not too much differences. i said the best one is 60. but maybe if you could test these hardwares, you would say no different between 56 and 60 and 70. ( I need to mention that all these frequencies have been checked with same camera resolution of 800*600 and the result were same. i will do it again with other camera resolutions to see if there is any changes and will update in here)
But my guess is B too.
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Re: Scanning of calibration panel

Postby MagWeb » Sun Dec 08, 2013 7:41 pm

You got me a bit wrong:
I meant the frequencies settings in DAVIDs SL settings not the projector's .
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Re: Scanning of calibration panel

Postby argo » Sun Dec 08, 2013 10:24 pm

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Re: Scanning of calibration panel

Postby argo » Tue Dec 10, 2013 9:47 am

Hi Gunter,

Here are the result tests. what do you say?

for both resolutions :

Best projector frequencies=60
Best exposure time = 1/30
Best result with shifts=16
Best fps=15

here is the test for resolution of 800*600 with David frequencies of 6 and 5 (6 is almost same as 7)
Untitled-1.jpg


Here is the test for resolution of 960*720 with David frequencies 7 and 6
Untitled-2.jpg
Left ->7 // right ->6


Regards,
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