Mirrroring surface
- NimaKarkhaneh
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Re: Mirrroring surface
I agree, I bleave cutting point cloud by aqustion time does not work for mirrors, however it would be great to have this option, I already have some scans with BLK2GO which part of data is not good and I want to cut that based on time and it seems impossible by current software.
- SlavikusAstana
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Re: Mirrroring surface
youtu.be/J3j7FsHKQ0o
my "favorite" mirrors.
Scanned a room with a carbon dioxide tank. The surface is a perfect mirror.
Laser scanning, panoramic shooting
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Re: Mirrroring surface
So the trouble is real … I think it’s still a great limit of this mobile scanner … surely in our usual jobs
- smacl
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Re: Mirrroring surface
Tough one to crack for sure. It would be interesting to see if a photogrammetric solutions would give better results, I suspect they would but still would suffer from other problems. Thomas Whelan's paper on the subject of detecting mirrors in scanned data makes for an interesting read (if a bit technical). It involves using specific targets with a recognisable pattern that can be identified in the scan data and used to isolate the mirror. Results suggest it works well for planar mirrors (i.e. not curved) and static scanning. I doubt it would cope with your carbon dioxide tank above, nor does it work with SLAM. I'd love to get a copy of the above data, though more out of interest than being likely able to do much with it.SlavikusAstana wrote: ↑Mon Oct 18, 2021 5:11 pm
youtu.be/J3j7FsHKQ0o
my "favorite" mirrors.
Scanned a room with a carbon dioxide tank. The surface is a perfect mirror.
- smacl
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Re: Mirrroring surface
I think for a mobile scanner, the main issue is being able get the timed trajectory file to go with the scan data and the times on each point such that the two can be connected. Once you have this, you can apply similar solutions to those afforded by static scanning, albeit working with cylindrical polar coordinates rather than spherical polars.
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Re: Mirrroring surface
The shiny tank inside a room is an extreme case. In the more typical case you have one or several planar mirrors on the walls of a room projecting false images into the neighboring rooms.
There splitting the point cloud into parts by acquisition time could work quite nicely. In principle you would split the point cloud each time you enter a new room. Then you could delete mirrored points spilling into the neighboring rooms manually just like you would do with static scans.
There splitting the point cloud into parts by acquisition time could work quite nicely. In principle you would split the point cloud each time you enter a new room. Then you could delete mirrored points spilling into the neighboring rooms manually just like you would do with static scans.
- smacl
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Re: Mirrroring surface
Just adding a quick link to another thread also covering this topic for reference purposes; https://laserscanningforum.com/forum/vi ... 804#p95804
- smacl
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Re: Mirrroring surface
Great idea! It doesn't distinguish between windows and mirrors and assumes the non-reflective side of the mirror is closer a wall than the reflective side, though is still worth trying as an algorithm for a semi-automated solution that could work well in most cases.mikajahkola wrote: ↑Tue Oct 19, 2021 9:41 am The shiny tank inside a room is an extreme case. In the more typical case you have one or several planar mirrors on the walls of a room projecting false images into the neighboring rooms.
There splitting the point cloud into parts by acquisition time could work quite nicely. In principle you would split the point cloud each time you enter a new room. Then you could delete mirrored points spilling into the neighboring rooms manually just like you would do with static scans.
- SlavikusAstana
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Re: Mirrroring surface
https://storage.st-vision.kz/forum/CO2.lgs
https://storage.st-vision.kz/forum/CO2.e57
or
https://drive.google.com/drive/folders/ ... sp=sharing
I exported this piece especially for you.
PS: scan performed on RTC360
Last edited by SlavikusAstana on Tue Oct 19, 2021 4:19 pm, edited 1 time in total.
Laser scanning, panoramic shooting
- smacl
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Re: Mirrroring surface
Many thanksSlavikusAstana wrote: ↑Tue Oct 19, 2021 2:29 pmhttps://storage.st-vision.kz/forum/CO2.lgs
https://storage.st-vision.kz/forum/CO2.e57
I exported this piece especially for you.
PS: scan performed on RTC360