Planeless Scanning

Questions, problems, comments and tips regarding the 3d scanning process.

Planeless Scanning

Postby Mike_A » Sat Sep 18, 2010 5:02 am

Hi All,
I have just started scanning with the David Scanner here in Australia.
My day job is teaching 3D scanning with Leica HDS and Riegl 3D scanners, everything from crime scenes to open cut mines.
The software is mainly Cyclone and RiScan Pro and also a bit of Rhino.

One question;(first of many I am sure)
When you are doing scans without the background planes is it the exact start and stop positions / scan speed that is critical ?
Or just the start and stop positions ?

I am really impressed with the David Scanner so far !
I will post some images shortly.

Cheers,
Mike.
532nm 5mw 3V Green line laser
Stepper-11YPG302S-LW4-R100 with 100:1 gear ratio Gearbox
Mono Camera - DMK31AU03. 1024 x 768 / 30fps
Arduino UNO/EasyDriver V4
Acer K11 Projector.
www.mikeannear.com
Perth, Western Australia.
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Re: Planeless Scanning

Postby Khalid Khattak » Sat Sep 18, 2010 6:22 am

For all planeless scanning only the Start position is very important and their is no problem which position you end the scan...You can stop your scan in the middle and retrieve the results.. but the start position must be always at the same location..if you read the Planeless scanning thread and David Wiki you will get lot of information...

The Scan speed is also important.. I normally reverse the laser with High speed and start scanning with keeping the same speed (slow) as i did in Reference scan.. I control my motor speed with POT, so one end of the POT gives me maximum speed whereas other end of the POT gives me slow speed...

I am using Trigger object for planeless scanning..its easy to use trigger object as compared to starting the scanning at the same location...
PC: Dell Inspiron i3, 2.27GHz,4GB RAM,64 bit windows 7
CAMERA:
David CCD Mono USB
LASER:
David 5mW Green line laser
PROJECTOR:
3D LED Mini Projector 250lumens, Native 1024x600
[b]http://free3dscans.blogspot.com/
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Re: Planeless Scanning

Postby MagWeb » Sat Sep 18, 2010 6:42 am

Hi, welcome

there are two modes in planeless scanning with DAVID (to be set in the advanced settings):
UseRememberedPlanes True or False;

In a Reference scan David calculates the precise position of each single laserposition per frame (or time) and calculates a model of the lasers motion too and strores it.
UseRememberedPlanes set to True means: Starting with frame 1 or time = zero, DAVID refers to the stored single planes`positions. This means, the motion of the laser may own some inaccuracies as long as these inaccuracies are the same in each scanning process.
UseRemenberedPlanes set to False means: Starting at frame 1 ot time zero, DAVID assumes a steady, averaged motion between the start and the end position. This means the charakter of your motion has to stay exactly the same within a single scan too.

You have two options to set this starting point in your workflow with the parameter ScanStartDetectionMode (0 or 1):
0 means that DAVID assumes the beam to be exactly at its recorded start position when you hit the Start button and performs its motion from there on now. To use this option, you have to have a COM connection to a lasermotion controller to trigger the motion.
1 means that DAVID waits for the first visible light it thinks to be the laser. Detecting it, DAVID thinks the laser is at its startposition (The position detected (in the reference scan) to be the first visible laserplane). Here you do not nead a COM connection, but you always have to make sure that the laser at its actual start position is visible for DAVID (which may not be the case in planeless situations) So you should use some trigger object placed in the scene to guarantee that.

curious to hear from a guy dealing with other scanning deviced. We can learn a lot :D

Gunter

Edit: noticed Khalid answered meanwhile. Please forgive doubled things.
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Re: Planeless Scanning

Postby Khalid Khattak » Sat Sep 18, 2010 7:14 am

Gunter.. You have explained very well:)
Thanks
PC: Dell Inspiron i3, 2.27GHz,4GB RAM,64 bit windows 7
CAMERA:
David CCD Mono USB
LASER:
David 5mW Green line laser
PROJECTOR:
3D LED Mini Projector 250lumens, Native 1024x600
[b]http://free3dscans.blogspot.com/
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Re: Planeless Scanning

Postby Mike_A » Sat Sep 18, 2010 11:43 am

Thank you very much guys !
I will experiment with the methods you outlined.
Regards,
Mike Annear
http://www.mikeannear.com/3D_scanning.html (needs updating !)
532nm 5mw 3V Green line laser
Stepper-11YPG302S-LW4-R100 with 100:1 gear ratio Gearbox
Mono Camera - DMK31AU03. 1024 x 768 / 30fps
Arduino UNO/EasyDriver V4
Acer K11 Projector.
www.mikeannear.com
Perth, Western Australia.
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Re: Planeless Scanning

Postby Mike_A » Sun Oct 03, 2010 10:54 am

Hi All,
Thank you to everyone for your help.
I have been doing my first planeless scans today, my test rig is pretty rough but I will rebuild it now I know a bit more about what I am doing.
I bought a Stepperbee starter kit (Motor,Software and electronics board), I am running the stepper motor through a Tamiya 400:1 kit gearbox (packed with silicon grease) and used A3 background boards to calibrate the setup.
I have a small microswitch to trigger the laser, as well as a small "reference "card to show the first scan lines.
The object that I scanned is a small (250mm) statuette carved from blue modellers foam.
I did 6 scans then joined them together in Fusion.
The render is from Rhino 3D.
Thanks again for all your help !
Regards,
Mike.
Attachments
Rhino Render.jpg
scanner.jpg
scanner2.jpg
532nm 5mw 3V Green line laser
Stepper-11YPG302S-LW4-R100 with 100:1 gear ratio Gearbox
Mono Camera - DMK31AU03. 1024 x 768 / 30fps
Arduino UNO/EasyDriver V4
Acer K11 Projector.
www.mikeannear.com
Perth, Western Australia.
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Re: Planeless Scanning

Postby SooS » Sun Oct 03, 2010 11:04 am

Great work, and nice to see a scan done with stepperbee as I am ordering this kit myself next week :)
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Re: Planeless Scanning

Postby Mike_A » Sun Oct 03, 2010 11:11 am

The backside :)
Regards,
Mike
Attachments
Rhino Render_2.jpg
532nm 5mw 3V Green line laser
Stepper-11YPG302S-LW4-R100 with 100:1 gear ratio Gearbox
Mono Camera - DMK31AU03. 1024 x 768 / 30fps
Arduino UNO/EasyDriver V4
Acer K11 Projector.
www.mikeannear.com
Perth, Western Australia.
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Re: Planeless Scanning

Postby Mike_A » Sun Oct 03, 2010 1:37 pm

Hi SooS,
Thanks !
I bought the Stepperbee as I know nothing about steppermotors / PC control etc and they seem to offer an "off the shelf" solution.
It was really easy to set up and it is quite easy to run.
I think my Tamiya gearbox might need replacing ....
One tip for the Stepperbee... I use the manual control to run the scan ("Manual Control" left hand side of screengrab), then the "Automatic Control, right hand side, to "reset" the scan. (see the image)
Mike.
Attachments
Stepperbee_gui.jpg
532nm 5mw 3V Green line laser
Stepper-11YPG302S-LW4-R100 with 100:1 gear ratio Gearbox
Mono Camera - DMK31AU03. 1024 x 768 / 30fps
Arduino UNO/EasyDriver V4
Acer K11 Projector.
www.mikeannear.com
Perth, Western Australia.
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Re: Planeless Scanning

Postby WalterMo » Sun Oct 03, 2010 6:51 pm

Hi Mike,
Congratulation for your planeless scan result and this in such a short time of learning.

Walter
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Re: Planeless Scanning

Postby MagWeb » Sun Oct 03, 2010 7:56 pm

Hi Mike,

really nice :) result (and object) - congrats!

Just visited your webside... wow: scanning a bridge and an underground station!
Now I know some more things to put on the feature wish list .....long range DAVID...just breading....

well done
Gunter
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Re: Planeless Scanning

Postby SooS » Mon Oct 04, 2010 7:39 am

Thanks for the heads up Mike :)
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Re: Planeless Scanning

Postby hunkatibor2 » Fri Oct 08, 2010 4:32 pm

Intel Pentium (r)D CPU 2.80GHZ 2.0 GB RAM Windows 7 32 bit 1GB GDDR5 David 3.10.4
Basler A622F camera Tamron Asfirical AF 28-80mm lense Lifecam (CANON) EFS18-55mm lense
LG DLP Projector PG6OG
Humanti Calibration panel system and Alignmed&Two camera
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Re: Planeless Scanning

Postby vw_bus » Tue Oct 12, 2010 1:26 pm

Nics scans. I have not got results anywhere near as good as that yet, but have nearly finished building a planeless system based on the design in the wiki. Up to now my system has just been a manually operated motorised laser.
The scans of Sydney harbour bridge ansn the resulting rendered models on your site are amazing! I've seen long range outdoor scans of buildings etc. before on TV, etc, but yours is the most impressive. How a system like that is calibrated is beyond me!
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Re: Planeless Scanning

Postby Mike_A » Sat Oct 23, 2010 3:51 am

Hi vw-bus,
Thanks !
The scanner we used for the Sydney Harbor Bridge project is made by Riegl
http://www.riegl.com/nc/products/terrestrial-scanning/
They are very long range, up to 2km !
There are some great shots of various projects in the Gallery section
http://www.riegl.com/nc/products/terres ... g/gallery/


The other scanners I work with are made by Leica Geosystems
http://www.leica-geosystems.com/en/HDS- ... W_5570.htm

They are all very expensive, from 150,000 to 250,000 USD (the new "Mobile mapper" scanners are about 800,000 !)
So the David scanner is a bargain !
532nm 5mw 3V Green line laser
Stepper-11YPG302S-LW4-R100 with 100:1 gear ratio Gearbox
Mono Camera - DMK31AU03. 1024 x 768 / 30fps
Arduino UNO/EasyDriver V4
Acer K11 Projector.
www.mikeannear.com
Perth, Western Australia.
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Mike_A
 
Posts: 58
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