DAVID structured light scanners

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

Postby Bongobat » Wed Nov 19, 2008 10:29 pm

Hi all,

Okay sorry for jumping ahead. I realize the first priority and the reason for this thread is to realize Structured Light in David.

I am seeing the difficulties in using it for the purpose of facial animation and forgive me if this is off topic but I have another idea I would like everyones opinion on.

What if we create a high detail base head using either the traditional david laser scanner or the projection method (eyes and mouth closed). Then we project the De Bruijn illumination pattern while the actor is performing. The 3d frames are stored and then each 3d frame is auto aligned with the base model and a normal or displacement map is created and fitted to the base mesh (such as in xNormal) Could facial animation be solved by applying the normal/displacement map to the base mesh in succession at the original video capture framerate?

Greg

EDIT: I have started a Motion Capture discussion here: http://www.david-laserscanner.com/forum ... =4506#4506 So we can continue on with the original topic :D
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Postby steapf » Sat Nov 22, 2008 11:44 am

Hi All!

I'm working on this topic (structured light, phase shift) in sparetime since a couple of month.
It is possible to scan in Realtime. I just need a better/faster camera to get good performance.

Thats my first captured Realtime-Test.
http://de.youtube.com/watch?v=VUgEPum-Ctk
... every actually computed Frame... So, the movie isn't running in original speed.

Youtube-quality is realy bad! :sad:
http://de.youtube.com/watch?v=VUgEPum-Ctk

Screenshot of original scan quality:
Image



These are my latest Tests,
Captured with a DV-Cam(720x576) - > 3 pictures - > converted into a DepthMap - > loaded it into my "DepthMapPreviewAndSmoothing Tool" ;) with anaglyph output.
So, if you have some Red/Green glasses somewhere...!? ;)
Image

You can find some more infos here on my "Funpage" and i will update it frequently:
http://www.strippo.de
soon... (don't know when! only a sparetime project) ;) ...I will add a download possibility there too. hmmm... you can register to recieve some News about it, if you want to.

-
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Postby Bongobat » Sat Nov 22, 2008 12:46 pm

Hi and welcome steapf,

WOW :shock: Really good work! Thank you for posting very interesting site and I look forward to trying out your software when you provide it :wink: Do you think your software would work well with a slide projector?

Also I thought you might enjoy an anaglyph that I made :D
http://david-laserscanner.com/forum/vie ... ight=giger
There is also a crosseyed version if you have that ability :)

Thanks again and keep up the great work!!!

seeya,
Greg
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Postby rexsham » Mon Dec 08, 2008 8:33 pm

hi all,
I am new to this forum and I reached here by searching for structured light scanning on google.

Well I found that some of you asked whether static slide projectors can be used and I am quite sure that this will work.

There are some commercial products that use static slides to project the fringe to the objects and they are not using DLP. They project gray code or special designed coding patterns frame by frame by rotating a circular slide wheel in front of a light source.

I am working on a large scale scanner that can scan an object of 3m(H) x 3m(W) x 6m(D) with milimeter accuracy and I think structured light will be a good choice for that.

I will be glad to see DAVID has structured light scanning ability in the future, scanning without background is very important.

Good work all~
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the Paul Devbec lab structured light scan

Postby fbmfbm » Wed Dec 10, 2008 6:01 pm

Hi all,

just for info, have you seen the site from Paul Debevec, the HDRI technics father and this tech lab for acquiring 3d scann to human faces...??

3d structured scan + normal map for detail ??

the page :

http://gl.ict.usc.edu/Research/DigitalEmily/

the site :

http://www.debevec.org/
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Re: DAVID structured light scanners

Postby Hervé » Sun Feb 15, 2009 9:32 am

What a reading...

ok, forgive my ignorance, but the price these people are asking for their marvelous structured light scanner can't be justified just because of the hardware they sell to you...
e.g. a cam and a projector... I mean... we're talking about $20,000 at the least...

http://www.3ddynamics.eu/scanners.html

But I there are also these much cheaper.. I don't understand what's the difference....

http://www.3d3solutions.com/order_now.php

Thanks..

what I do know is that structure light is the future.. way less limitations than lasers.. hey they even scanned a black flocked velevt doll head...
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Re: DAVID structured light scanners

Postby Shorty » Tue Feb 17, 2009 11:30 am

Hi All,
First Post from me, down under,
While we are on the subject,
Does anyone have experience or knowledge with the Flexscan 3d structured light scanner.
I have looked everywhere and cant find any comments(bad or good),videos,reference material,etc etc other than whats
on their website.

Iam interested in scanning faces and then machining them on a cnc 4th axis router.
I have seen a few machined here in the galley ,and they have done a great job with David scanner.

However,I dont think i could convince anyone other than my own family to stay still enough and in front of a laser while
i scanned them,Hence my interest in SLS.

Anyone who has had dealings with an affordable SLS scanners I would be interested to hear from.

Thanks
Regards
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Re: DAVID structured light scanners

Postby phantom3D » Fri Feb 27, 2009 8:04 am

Here is a pretty good paper on real time structured scanners. I don't know anything about it but it seems pretty comprehensive.

http://www.ic.sunysb.edu/Stu/sewang/rep ... roject.pdf
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Re: DAVID structured light scanners

Postby GoogleTibor » Sat Mar 07, 2009 1:56 pm

Pc Hardware : AMD Sepron 2800 2.1 GHz 1 GB RAM
Cam : Microszoft LifeCam VX- 6000
Laser : 5 Mw Red pointer glass pole you are green laser Mattia timer clock
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Re: DAVID structured light scanners

Postby Goju-Ryu » Tue Mar 24, 2009 11:52 pm

Hi all,

I've recently found this forum and started to work in the subject of structured light for 3D shape measurements.

I've read in this thread that there is a code built with Processing to do what mm_alex did in C++.

Unfortunatelly, the links provided here to that code are no longer available.

Is it possible to someone to share this source code with me or give me a valid link?

Any help would be greatly appreciated!

Thank you very much in advance.

Best regards!
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Re: DAVID structured light scanners

Postby grandslam » Tue Mar 31, 2009 5:46 pm

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Re: DAVID structured light scanners

Postby MagWeb » Tue Mar 31, 2009 6:26 pm

Hi,

no, that´s not the code based on mm-alex. But it´s also worth a try.... thanks for posting. :D

If somebody is looking for the code I mentioned above (the sandtable version of f.jennets processing sketch of mm_alex code):

http://code.google.com/p/sandtable/source/browse/#svn/trunk/StructuredLight

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Re: DAVID structured light scanners

Postby Goju-Ryu » Tue Mar 31, 2009 6:43 pm

Hello all!

With the code from the sandtable project, how are you projecting the fringes? :?:

Has anybody here already managed to calibrate the camera and projector to then calculate the depth of the scene points?

Best regards!
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Re: DAVID structured light scanners

Postby NextDesign » Tue Apr 21, 2009 3:34 am

Does anyone have the code for the light scanner before the sandtable guys got at it? I would like to use
images rather than a webcam. As well, it seems they added a lot of other stuff that isn't really needed for
normal scanning. If anyone could help me out, that would be great!
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Re: DAVID structured light scanners

Postby MagWeb » Mon Apr 27, 2009 11:59 pm

Hi,

here it started, so it has to be reported here:

puzzled together an application based on MM-Alex´s code, fjennet's sketch and the work of the sandtable guys.
( nice project see:http://www.vimeo.com/2519544)

ok. got a working structured light application to project the fringes, capture the 3 needed images , reading those images to 3D and exporting them to STL.

The code was built using PROCESSING.
An exported application, based on Java, can be used on MAC, Linux and WIN: Three windows: A 3D viewer, a controller window and a third pattern window that runs on the projector.... Does a scan in less than a second.... still some precession to find...
Calibration has to be done by guess feeling ....

As I get it to reasonable results the source will be open...
If there´s somebody willing to contribute...

Some impressions:
Attachments
Flatplane.jpg
3Windows.jpg
hand1.jpg
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