Mirrroring surface

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Re: Mirrroring surface

Post by NimaKarkhaneh »

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.
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Re: Mirrroring surface

Post by SlavikusAstana »


youtu.be/J3j7FsHKQ0o

my "favorite" mirrors.
Scanned a room with a carbon dioxide tank. The surface is a perfect mirror.
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Re: Mirrroring surface

Post by piero »

:( So the trouble is real … I think it’s still a great limit of this mobile scanner … surely in our usual jobs
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Re: Mirrroring surface

Post by smacl »

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.
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.
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Re: Mirrroring surface

Post by smacl »

piero wrote: Tue Oct 19, 2021 7:41 am :( So the trouble is real … I think it’s still a great limit of this mobile scanner … surely in our usual jobs
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

Post by mikajahkola »

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.
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Re: Mirrroring surface

Post by smacl »

Just adding a quick link to another thread also covering this topic for reference purposes; https://laserscanningforum.com/forum/vi ... 804#p95804
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Re: Mirrroring surface

Post by smacl »

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.
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.
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Re: Mirrroring surface

Post by SlavikusAstana »

smacl wrote: Tue Oct 19, 2021 8:35 am 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.
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.
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Re: Mirrroring surface

Post by smacl »

SlavikusAstana wrote: Tue Oct 19, 2021 2:29 pm
smacl wrote: Tue Oct 19, 2021 8:35 am 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.
https://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
Many thanks :D
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