Preprocessing Congested Scanning Areas Containing Stainless Steel

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sam_90
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Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by sam_90 » Sat Oct 12, 2019 7:18 pm

Hi, not sure if this has been asked before but I can't seem to find any definite answers. I'm currently scanning a heavily congested area of pipes, flanges, instrument tubing & steelwork. Some of the pipes and flanges are stainless steel, albeit rather dull. A lot of the scan locations are very close to what is being scanned. Because of this the data is coming out very noisy and there are a lot of outlying points - the data looks very messy. Does anyone have any experience of scanning in these conditions? And what do you do to tidy up the data, i.e. preprocessing options, plugins, etc.? I'm using a FARO Focus 3D X 130 HDR & running Scene 7.3.1.1653.
Thanks, Sam.

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Re: Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by Leandre Robitaille » Sat Oct 12, 2019 9:55 pm

Did you apply the Edge artifact filter on your scans?

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Felix_the_Cat
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Re: Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by Felix_the_Cat » Sat Oct 12, 2019 10:20 pm

there are settings for distance

try "Near"

it makes crap scans at any distance, but helps quite a bit with shiny and close

then crank up the quality and give it a shot
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Wdigman - Europe
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Re: Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by Wdigman - Europe » Sun Oct 13, 2019 7:11 am

In an environment like that be sure to use Spheres or Black and White Targets. If the point cloud data is messy to begin with then Cloud registration will just make it worse.

As for extracting data, well not everything is perfect for scanners. The data you have will not be clean and seeing things will be difficult. Take lots of pictures, maybe some spot measurements on pipes noting the diameters and such. Prepping for bad data is easier then surprises.

Once scanned a stainless steel kitchen in a govt building. The place was spotless, all of the point clouds intensities were red, except the floors and ceilings. Lots of reflections. Almost as bad as scanning a fitness center with floor to ceiling mirrors.

Cheers.

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Re: Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by James Hall » Mon Oct 14, 2019 5:29 pm

Not always possible, But if you have to scan shiny you would be amazed at what painters tape and and paper will do. Hanging printer paper in the corners and in the middle of a glass wall will give you what you need to model it from the scan. Shiny railings put some tape on the bends and in them middle.
There is some setup and clean up, but you get what you need to make the scan work. Out door polished stone work, Baby power can help, but clean up is a b*#@^.

Also flat white spray paint, If the client is OK with knocking the shin down on stainless steel flanges. Often stainless is used for chemical resistance not aesthetics. The paint can be scanned with in minutes of spraying. Talking to a client about the limitations and workarounds of scanning technology can get some reasonable accommodations.

There are some jobs that just are not cost effective to scan and that also needs to be communicated to the client.

James,
Last edited by James Hall on Mon Oct 14, 2019 6:00 pm, edited 1 time in total.

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Re: Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by James Hall » Mon Oct 14, 2019 5:32 pm

Cleaning reflections and noisy data is time consuming. You can set points in the corners of rooms and used those as control points to help with the lack of Cloud to Cloud registration.

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Re: Preprocessing Congested Scanning Areas Containing Stainless Steel

Post by sam_90 » Thu Oct 17, 2019 5:31 am

Thanks all. Taken the advice and I'm surprised at how well the data looks, especially with the laser illuminated HDR photos applied.
Cheers.

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