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Scanning of calibration panel

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

Scanning of calibration panel

Postby argo » Fri Nov 08, 2013 10:46 pm

Hello Davidians,

I always make a scan of panel, after calibration.
Everything looks ok but there are always some vertical lines on scanned panel. is that normal or is it something that i should take care about?
Anyway it seems that i not not able to remove these lines.
Any suggestions?

Regards,
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2013-11-09_00-59-38.png
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Re: Scanning of calibration panel

Postby Lunat1c » Sat Nov 09, 2013 12:20 am

-It looks like the wall-to-wall reflection we experience with an inner corner (or positive corner) setup.
-The problem is it is very emphasized in your scan.
-Some people use outer corner to avoid this.
-DAVID is natively designed for inner corner.
-And a few guys use an inner corner but put a thin mat black paper(or whatever it is) across the center of the corner.
-In my opinion you have multiple problems.
-If you share your scan procedure step by step with pictures, the pros here can help you further.

Best regards,
Mitsubishi xd 206u, logitech pro9000, acer 3820tg
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Re: Scanning of calibration panel

Postby argo » Sat Nov 09, 2013 8:39 am

Thanks Lunat1c.

Here is my setup for the above scanned panel.
hope it helps to find the solution.

Regards,
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IMG_9976.JPG
IMG_9982.JPG
Untitled-1.jpg
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Re: Scanning of calibration panel

Postby argo » Sat Nov 09, 2013 8:42 am

And this one
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2013-11-09_01-18-51.png
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Re: Scanning of calibration panel

Postby argo » Sat Nov 09, 2013 6:04 pm

I just found out they are not only some simple vertical lines.
They are shapes. which affects the scan of objects same as the panel.

Shahram,
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2013-11-09_20-23-23.png
2013-11-09_20-32-16.png
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Re: Scanning of calibration panel

Postby hunkatibor2 » Sat Nov 09, 2013 6:38 pm

Hi
http://forum.david-3d.com/viewtopic.php?f=2&t=5758
Unfortunately I did not receive an answer to my request malfunction.
Tibor :(
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 Lunat1c » Sun Nov 10, 2013 2:37 pm

Dear argo,

I wasn't scanning for 2 days, I'm planning to have a scanning session tonite. I will try to get the same distortion you have, If I achieve it, I'll report.

Best regards,
Mitsubishi xd 206u, logitech pro9000, acer 3820tg
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Re: Scanning of calibration panel

Postby argo » Sun Nov 10, 2013 7:23 pm

hunkatibor2 wrote:Unfortunately I did not receive an answer to my request malfunction.

I believe the guys will be back soon. and they will help you out.

Lunat1c wrote:Dear argo,

I wasn't scanning for 2 days, I'm planning to have a scanning session tonite. I will try to get the same distortion you have, If I achieve it, I'll report.

Best regards,


That is great of you my friend and i really appreciate it.

Best Regards,
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Re: Scanning of calibration panel

Postby argo » Mon Nov 11, 2013 2:31 pm

Hello,

I dont know if it is going to be unanswered topic or not.
last night i thought there might be some similar topics to mine which already has been answered. so i tried whole 5 pages of Camera Calibration, and there was not any even close to mine.
so again i started to test the system. and here is the best panel-scan i achieved.
but some how i think the light of calibration is not right!! or maybe it is??!!

Shahram,
Attachments
2013-11-11_16-42-32.png
2013-11-11_16-45-00.png
2013-11-11_16-45-13.png
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Re: Scanning of calibration panel

Postby Lunat1c » Mon Nov 11, 2013 2:54 pm

-argo the scan in your last post is too dark. Even if I hadn't see the last calibration scan, I could have said it was dark. Because the surface is blurry.
-Last night I had a short session because I felt sleepy. In the short time, I couldn't get a problem like yours.
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Re: Scanning of calibration panel

Postby argo » Mon Nov 11, 2013 4:08 pm

Lunat1c wrote:-argo the scan in your last post is too dark..


Hello,
I know The red intensity curves must be sinusoidal and mine is flat, which makes the image blurry,
But it was the best case to get ride of those vertical shapes.
and i wanted to share it so maybe the Davidans help me to find the issue.

Regards,
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Re: Scanning of calibration panel

Postby argo » Mon Nov 11, 2013 6:01 pm

Last Post here

I really don't know how to ask Davidians to help. there must be some tricks for that :lol:
about 2000 views and not even a single comment (except Lunat) :roll:

Here are my last results and i wonder if it is ok or not. i am just totally confused and i guess i need a big vacation.

Regards,
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2013-11-11_20-18-56.png
2013-11-11_20-14-24.png
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Re: Scanning of calibration panel

Postby Lunat1c » Mon Nov 11, 2013 6:40 pm

-This last result is very good...
-If you also want to get rid of the little pixel like reliefs (they're literally pixels of your projector), you can put the board a little out of focus of the projector. This way you have a smoother scan, but you lose sharpness. But I don't prefer it, I'm fine with those little imperfections as far as the scans are sharp.
-If you want to obey the david manual, you can increase brightness for one or two clicks, but your projector is a bulb projector and excessively bright for little objects, I may sometime prefer it to be a little dim to get less noise.
To conclude, probably I would click OK button with your las calibration and start scanning.

Best regards.
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Re: Scanning of calibration panel

Postby gkrywusha » Mon Nov 11, 2013 6:44 pm

Hi Argo,

I'm new as of last week, but I can tell you I've gotten night and day results with my logitech cams rolling back drivers. I had the dark blurry images you had. But with the ability to really control brightness, sharpness, contrast and gain my black/white grid is strong. And never going autofocus was a must. Also, using a 4+ lens on my projector allowed a much better clarity of the grid.

Greg K.
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Re: Scanning of calibration panel

Postby Lunat1c » Tue Nov 12, 2013 3:08 pm

when I forgot to deactivate autofocus, I got this
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