Possible Scanner Error

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planlondon
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Possible Scanner Error

Post by planlondon »

Hi All,

I think we have an error with our Faro M70 scanner. We have had it since February, however we were looking at a preview image and noted a jump in the middle of the picture. We just thought it was how the image was generated, however when we looked at the scan data for that scan it looks like there is a jump/overlap within a single scan. Please see image attached.
Has anyone ever had this before or know what it might be?

Thanks for your help.
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Re: Possible Scanner Error

Post by caddman97 »

Your images are small, I had to zoom in. Is the area highlighted the jump you are referring to?
2018-11-12_131925.png
That looks like the merge point for the scan. Typically if they are too large you will need to get the scanner calibrated.
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Re: Possible Scanner Error

Post by ARGAS »

I have S70 and I know what you are talking about, but - when I am connecting scans it moving back on a good position after several seconds when scan is loaded.
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planlondon
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Re: Possible Scanner Error

Post by planlondon »

Hi,

Yes that is the area as you've outlined. On external scans 20-30m you can see it more than some of the internal room scans we've been doing. Do you think it just needs re-calibrating?
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Re: Possible Scanner Error

Post by pomped »

For clarification:
Do you see any misalignment of the points in the 3D view?

If it is just visible in the planar view it is totally fine. The reason is that the scanner turns 180° during capturing. To ensure no gaps between the beginning and the end a little overlap is captured.
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Re: Possible Scanner Error

Post by planlondon »

Image of Scan Data Jump.png
Hi,

Yes we see it in the preview image, planar view and the scan data itself.
I have attached another image of the scan data looking at a ceiling. You can see that there is a jump and also that the data has overlapped.
Cheers
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planlondon
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Re: Possible Scanner Error

Post by planlondon »

Wrong image!
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Re: Possible Scanner Error

Post by mikajahkola »

Does this happen regularly or just once?
An alternative explanation is that you put the tripod in a bad spot and one leg dropped a tiny bit in the middle of a scan.
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Re: Possible Scanner Error

Post by brian715 »

mikajahkola wrote: Tue Nov 13, 2018 9:45 pm Does this happen regularly or just once?
An alternative explanation is that you put the tripod in a bad spot and one leg dropped a tiny bit in the middle of a scan.
I would agree here. If this is just in one scan, then the scanner was probably bumped, leg slipped, scanner moved in some way.
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Re: Possible Scanner Error

Post by planlondon »

Hi guys,

unfortunately this isn't a one of. we have looked back at 10 different jobs choosing random scans from those jobs and we have the same issue.
I have spoken to Faro and sent them a file and this is what they have come back with:
"thanks for the scan. I checked it. There is no collimation error (offset in z direction), what means the angle adjustment to overlay the both scan halves did work.
But the scan halves have an offset in X- and y- direction what is probably not repairable by manual adjustment and in addition would not be recommend as it does not solve the issue.
One reason for such a situation can that the scanner was not mounted properly on the tripod and could easily rotate. Then the error image looks exactly the same.

I will forward the scan to our developers for a further analysis and to advise next step."

does that make sense to you guys?
Cheers
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