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DAVID-Laserscanner Forum • View topic - Structured light scanning failing??
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Structured light scanning failing??

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

Structured light scanning failing??

Postby karlkohl » Mon Dec 13, 2010 12:57 pm

I have done the setup as per mention in the forum and the David scanner manual.
Performed the calibration steps and took proper images.
Yet structured light scanning is not working.

What could be going wrong??
Any clues what can I do right to get a decent scan??
The calibration result was successful but even after that I can't get a proper scan.

My work-flow is as under.
Projector : 1024 x 768 DLP
Cam: 14Mp DSLR with 18-55mm lens ---> outputs RAW images (4608 x 3072pixels)

I am resizing the images to 1152 x 768px and converting to ".bmp" format to maintain the aspect ratio(3:2) of the original image and also so that David can work with them.
Is this causing the problem.

I have upload all my images (File name 1.rar), low res jpg's.
Can't upload the originals as the forum doesn't allow me to upload large attachments.
Attachments
slimgs.zip
(1.42 MiB) Downloaded 185 times
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Re: Structured light scanning failing??

Postby MagWeb » Mon Dec 13, 2010 1:22 pm

Hi,

at a first quick look:

- move your cam closer to the corner, so it sees nothing else but the corner;
- fix your patterns absolutly flat on the corner (best: use selfadhesive paper);

EDIT:
- increase contrast ,so the images are nearly black in the dark zones of the projections.
EDIT:
- do not use a totally back image instead of the image of the totally black projection (img01)
MagWeb
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Re: Structured light scanning failing??

Postby karlkohl » Mon Dec 13, 2010 2:05 pm

karlkohl
 
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Re: Structured light scanning failing??

Postby MagWeb » Mon Dec 13, 2010 2:54 pm

It doesn´t matter if whether you increase the projector's or cam´s contrast - important is the resulting image, which should be as dark as possible where no light was projected onto the scene.

Your img01 is totally black all over - seems there are no gray values at all. In the past, some lazy guys simply replaced that image by a virtually made black one. It is important that you actually shoot this image with the same settings of the cam as used in all other images. This image defines the "totally black status" and its values are "subtracted" from the following images... It seems to me that your img01 does not fit to all the other images.
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Re: Structured light scanning failing??

Postby karlkohl » Mon Dec 13, 2010 3:09 pm

Attachments
calresult.jpg
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Re: Structured light scanning failing??

Postby MagWeb » Mon Dec 13, 2010 3:53 pm

Yes, besides the wavy fixing of the patterns ( I mentioned above ) , it seems that the distance of the corner to the inner rows of points is a bit smaller.

Your boards seem to be corrugated cardboard ? Choose some realy flat material (white furniture board or something similar) and set the 90°angle carefully.
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Re: Structured light scanning failing??

Postby karlkohl » Mon Dec 13, 2010 5:54 pm

karlkohl
 
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Re: Structured light scanning failing??

Postby karlkohl » Wed Dec 15, 2010 5:16 am

karlkohl
 
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Re: Structured light scanning failing??

Postby MagWeb » Wed Dec 15, 2010 8:42 am

try this:
do calibration loading the image shot of an empty corner using the image grabber as cam;
do scanning using the StucturedLightGrabber and load your serie of 12 images with projected patterns (with our without planes);
when you´ve got the scanresult, go back to the calibration page and choose the image grabber as a cam again and load your texture image;
Go to the scanning page and click grab texture;
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Re: Structured light scanning failing??

Postby karlkohl » Wed Dec 15, 2010 11:53 am

karlkohl
 
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Re: Structured light scanning failing??

Postby karlkohl » Wed Dec 15, 2010 5:27 pm

How long do I have to keep the scan going? Is it that with many passes the output improves, at the moment I am pausing the scan after the first pass.

Also I find that there are many holes in the object, the areas that were black in the original object don't seem to appear in the final 3d model and there are other random holes possibly because the Structured light is not bright in those areas.

I noticed that a part of my object had some raised text(about 1 to 1.5mm) from the however in the final 3d model these raised text parts are not seen.

Regards,
Karl
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