Scene hyperscan misalignment

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NickD
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Scene hyperscan misalignment

Post by NickD »

Hi

Has anyone else had problems with hyperscans not being correctly aligned? I have had issues with non-vertical pipes/cylindrical shapes where the hyperscans show up as ghosting. At first I thought this was due to vibration, as I was scanning live plant. However, the last project was done in the workshop (reverse engineering a vessel) with zero vibration. The vertical main cylindrical portion was fine, however, there are nozzles at odd angles and even after manual registration of 2 scans, it was clear that the hyperscans were not aligned at these nozzles. I had good registration using only the main scans, without the hyperscans. This leads me to think the software incorrectly registered the hyperscans with the main scans. See attached screen shots showing the problem. Nozzles are 4"diameter at about 45 degrees to the vertical.

Nick
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Re: Scene hyperscan misalignment

Post by Justin Richards »

NickD wrote: Fri May 10, 2024 12:10 am Hi

Has anyone else had problems with hyperscans not being correctly aligned? I have had issues with non-vertical pipes/cylindrical shapes where the hyperscans show up as ghosting. At first I thought this was due to vibration, as I was scanning live plant. However, the last project was done in the workshop (reverse engineering a vessel) with zero vibration. The vertical main cylindrical portion was fine, however, there are nozzles at odd angles and even after manual registration of 2 scans, it was clear that the hyperscans were not aligned at these nozzles. I had good registration using only the main scans, without the hyperscans. This leads me to think the software incorrectly registered the hyperscans with the main scans. See attached screen shots showing the problem. Nozzles are 4"diameter at about 45 degrees to the vertical.

Nick
Can you share out two of the scans you are having an issue or post overview to help identify the issue?
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Re: Scene hyperscan misalignment

Post by landmeterbeuckx »

What is a hyperscan?
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Re: Scene hyperscan misalignment

Post by Least »

I think its a fancy name for a windowed scan.
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Re: Scene hyperscan misalignment

Post by landmeterbeuckx »

Least wrote: Mon May 13, 2024 5:43 pm I think its a fancy name for a windowed scan.
A detail scan in my vocabulary :D
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Re: Scene hyperscan misalignment

Post by Devanshu »

Hi,
We have been facing this issue with many of the scans that happen with leica P40 as well. Many a times, the detail scan does not overlap with Dome scan (main scan) and then have to be manually removed after complete registration in Cyclone core.

I use Leica Register 360+ for usual work. And there is no functionality to separate out the Dome and Detail scans for any individual station.
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Re: Scene hyperscan misalignment

Post by pfirmsto »

Devanshu wrote: Thu Jul 11, 2024 7:59 am Hi,
We have been facing this issue with many of the scans that happen with leica P40 as well. Many a times, the detail scan does not overlap with Dome scan (main scan) and then have to be manually removed after complete registration in Cyclone core.

I use Leica Register 360+ for usual work. And there is no functionality to separate out the Dome and Detail scans for any individual station.
I wonder if it's possible to export both as PTX files, then copy the transformations from the header of the dome scan, to the window scan? This should fix any misalignment between the two scans, theoretically, they're captured from the instrument occupying the same position, so it should work.
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Re: Scene hyperscan misalignment

Post by Daniel Wujanz »

pfirmsto wrote: Thu Jul 11, 2024 8:06 am
Devanshu wrote: Thu Jul 11, 2024 7:59 am Hi,
We have been facing this issue with many of the scans that happen with leica P40 as well. Many a times, the detail scan does not overlap with Dome scan (main scan) and then have to be manually removed after complete registration in Cyclone core.

I use Leica Register 360+ for usual work. And there is no functionality to separate out the Dome and Detail scans for any individual station.
I wonder if it's possible to export both as PTX files, then copy the transformations from the header of the dome scan, to the window scan? This should fix any misalignment between the two scans, theoretically, they're captured from the instrument occupying the same position, so it should work.
Peter is right!

+1 for this procedure

...even though it can alternatively be used as a punishment for somebody who slayed mother and father since ptx is a clunky ASCII format.

It also works with E57 if you have a software that can manipulate the header section. See "pose section" where you can tweak "translation" and "rotation".

All the best

Daniel
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Re: Scene hyperscan misalignment

Post by Devanshu »

pfirmsto wrote: Thu Jul 11, 2024 8:06 am
Devanshu wrote: Thu Jul 11, 2024 7:59 am Hi,
We have been facing this issue with many of the scans that happen with leica P40 as well. Many a times, the detail scan does not overlap with Dome scan (main scan) and then have to be manually removed after complete registration in Cyclone core.

I use Leica Register 360+ for usual work. And there is no functionality to separate out the Dome and Detail scans for any individual station.
I wonder if it's possible to export both as PTX files, then copy the transformations from the header of the dome scan, to the window scan? This should fix any misalignment between the two scans, theoretically, they're captured from the instrument occupying the same position, so it should work.
Do you mean we export the PTX files and replace the transformations. and then reimport them in cyclone ? I am not sure how to work on ptx files for further registration proceedure, if needed.
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Re: Scene hyperscan misalignment

Post by Daniel Wujanz »

Devanshu wrote: Thu Jul 11, 2024 8:19 am
pfirmsto wrote: Thu Jul 11, 2024 8:06 am
Devanshu wrote: Thu Jul 11, 2024 7:59 am Hi,
We have been facing this issue with many of the scans that happen with leica P40 as well. Many a times, the detail scan does not overlap with Dome scan (main scan) and then have to be manually removed after complete registration in Cyclone core.

I use Leica Register 360+ for usual work. And there is no functionality to separate out the Dome and Detail scans for any individual station.
I wonder if it's possible to export both as PTX files, then copy the transformations from the header of the dome scan, to the window scan? This should fix any misalignment between the two scans, theoretically, they're captured from the instrument occupying the same position, so it should work.
Do you mean we export the PTX files and replace the transformations. and then reimport them in cyclone ? I am not sure how to work on ptx files for further registration proceedure, if needed.
Dear Devanshu,

a ptx file contains of a header section and the body aka the point cloud. The header section gathers information about the scanned angular matrix as well as the transformation, see e.g. https://paulbourke.net/dataformats/ptx/.

What you need to do:
Export two scans, one being the mother scan the other being the child scan. Your aim is to transform the child scan into the coordinate system of the mother scan.

Simply copy the header information (excluding the first two lines!) from mother scan into the child scan (Notepad++ can handle big(ger) files should you be facing issues while editing). Since the body typically contains local coordinates in the local scanner coordinate system you are just fine. This procedure will fail if you have used the unify procedure in Core or Register before.

All the best

Daniel
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