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Alignment markers

The place for all topics related to the 'Shapefusion' tool of DAVID.

Alignment markers

Postby Ingo » Sun Apr 12, 2015 9:19 pm

Hi,

I would like to start a discussion on alignment markers.
As it is quite obvious and generally recognized, an object, which has very little details either in topology (like something with a thin edge or a sphere or something like that) or in texture could be tricky to align.
That is why a lot of different possibilities to introduce differencies have been reported in this forum.
I would like to draw attention to he ones I recognised, but surely this is not an exhaustive overwiew, as far, that there might be more topics on this point.
Anyway, there are a lot of good ideas, either by means of 2D markers (best recognized by texture, comparable to the ones used by e.g. creaform) or 3D markers The last ones could be applied either on the scanning object or (to do not interfere with to object itself) somewhere in the nere of the object.
As I am not dealing with texture and/or 2D markers, my foccus is on the usage of 3D alignment markers to achieve (a better) alignment of difficult (see above) scans.
In the following I reference to the verious possibilities reported in this forum:
- I for myself have been orientated on a video (https://www.youtube.com/watch?v=uOPjr59DUmI), which was shared by hunkatibor (http://forum.david-3d.com/viewtopic.php?p=29417#p29417). For this, I use small half spheres and cuboids from LEGO (LEGO bricks) to be flexibly arranged on a plate. For an example, please see: http://forum.david-3d.com/viewtopic.php?p=32173#p32173.
Other possibilities are:
- A Scanning alignment ring: (http://forum.david-3d.com/viewtopic.php?p=26974#p26974),
- a irregukar shaped ring by hunkatibor2: (http://forum.david-3d.com/viewtopic.php?p=30739#p30739),
- Balls attached or in the near of the object by NARMELLA and micr0: http://forum.david-3d.com/viewtopic.php?p=30617#p30617, http://forum.david-3d.com/viewtopic.php?p=31713#p31713,
- little cubes or spheres introduced by hal: (http://forum.david-3d.com/viewtopic.php?p=26149#p26149), see also the post on small cubes or pyramids or spheres (http://forum.david-3d.com/viewtopic.php?p=30572#p30572, where also 2D markers are mentioned.
- irregular pieces (clay, plasticine or play-doh) added by Gunter: (http://forum.david-3d.com/viewtopic.php?p=27150#p27150, http://forum.david-3d.com/viewtopic.php?p=19695#p19695, http://forum.david-3d.com/viewtopic.php?p=18887#p18887, 2D markers are also mentioned.)

For the application of 2D markers see (even if this is not part of my post) e.g.:
http://forum.david-3d.com/viewtopic.php?p=27163#p27163
http://forum.david-3d.com/viewtopic.php?p=18887#p18887

What I would like to diskuss are the following points:
- what is the best shape for alignments marker (something indifferent like spheres or distinct shapes like cubids or irregular shape mentioned before)? I tried cuboids for better alginment by the possibilty of using " Contact pair Selection").
- what is he best scale and position for such things?

I hope, I can provoke some diskussion on the best way to use alignment markers.
I would appreciate any comments on that topic.

Best regards
Ingo
SLS-1
SLS-2
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Re: Alignment markers

Postby hunkatibor2 » Sat Jan 09, 2016 7:45 pm

HI
Image
This solution is very appealing to me
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Re: Alignment markers

Postby hunkatibor2 » Wed Jan 13, 2016 8:21 pm

Attachments
2016-01-13_18-38-40.png
2016-01-13_20-09-37.png
2016-01-13_20-09-47.png
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Humanti Calibration panel system and Alignmed&Two camera
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Re: Alignment markers

Postby TheChosenOne » Sat Jan 16, 2016 1:01 am

Not bad, but the cones for markers, in this case better suited ...
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Re: Alignment markers

Postby hunkatibor2 » Sat Jan 16, 2016 4:18 pm

Hi
Please put up a picture of conical marker. I do not know the solution.
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Re: Alignment markers

Postby hunkatibor2 » Sun Jan 17, 2016 11:03 am

Hi
Interchangeable adapter marker illustrious rotation principle. I always use the appropriate size of the object.
Tibor
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Re: Alignment markers

Postby hunkatibor2 » Sun Jan 17, 2016 11:08 am

Hi
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Re: Alignment markers

Postby hunkatibor2 » Sun Jan 17, 2016 5:56 pm

Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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Re: Alignment markers

Postby hunkatibor2 » Thu Feb 04, 2016 6:41 pm

Hi
Humanti Marker System (HMS) Patent Pending
https://en.wikipedia.org/wiki/Patent_pending
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2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
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Humanti Calibration panel system and Alignmed&Two camera
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Re: Alignment markers

Postby VDX » Thu Feb 04, 2016 7:24 pm

... hmmm ... you give me an idea for better micro-scanning with reduced optics.

J have some 'code-plates' from dentalscanners with a pixelcode on the bottom side for position detecting.

I think, they should be berfect suited as unique alignment markers too :wink:

Here are some images of the code-plate:

Scan-plate.jpg


Scan-plate_detail.jpg



... and the image of the 'encoder-camera':

Scan-plate_micro.jpg


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Re: Alignment markers

Postby hunkatibor2 » Sun Feb 07, 2016 6:46 pm

Hi VDX
I'm curious about your idea.
Only automatic adjustment, no post-production! I think this is the peak
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2016-02-07_18-25-31.png
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LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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Re: Alignment markers

Postby hunkatibor2 » Sat Feb 13, 2016 11:28 am

Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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Re: Alignment markers

Postby micr0 » Sat Feb 13, 2016 3:40 pm

Gives new meaning to the term Salad spinner.

I had an issue last night with alignment markers. My trunion has the primary axis horizontal. I was scanning a heavy casting and using ping pong balls as alignment markers. When I went to align the scans, they were slightly off and the meshes of the balls were not coming together to give me good spheres. I spent hours trying to figure out why. This morning it occurred to me that the alignment markers were fixed to the rotary axis and not the part being scanned. I believe the part is flexing it's mount and throwing the distances to the alignment markers off. I'm going to test that theory later today. Something to think about.

µ
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Re: Alignment markers

Postby hunkatibor2 » Sun Feb 14, 2016 6:12 pm

Hi
HMS finished the two-axis rotating aim is to achieve a stepper motor version.
Tibor
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2016-02-14_18-20-22.png
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Humanti Calibration panel system and Alignmed&Two camera
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Re: Alignment markers

Postby hunkatibor2 » Sun Feb 14, 2016 7:15 pm

Hi
Exrém inverted position, you can see it under his chin.
Tibor :D
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003.JPG
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Intel Xeon E5410 2.33GHZ 16GB RAM Windows 7 64bit David 4.5.0
2 Basler A622F camera 2 Tamron Asfirical AF 28-80mm lense
LG DLP Projector PF1500G Canon D40 Tokina 17-70mm 1:2.8-4,5
Humanti Calibration panel system and Alignmed&Two camera
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