Dear DAVID Community,

As you are probably aware, the entire DAVID company, team and product range has been integrated into HP Inc.
This forum is now read-only. Relevant content has been migrated to HP and merged into HP's Support Forums on November 1, 2016.

To start new discussions for 3D Scanning, please register and post your new topic at the HP Support Forums

Weird lines...

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

Weird lines...

Postby AlbinKlein » Tue Mar 11, 2014 11:21 am

I am having this problem now and is not something happening all the time and I can't really find out what's causing it to solve it...

Here is a picture of a model scanned with the lines: (raw scan)

WTF.jpg
Weird lines


And then without them, (fused scan but it didn't have the lines anyway)

MAHAKALA_1_test.jpg
No lines


I haven't changed anything, same setup, same computer, same all and I am really freaking out... Sometimes they are more noticeable than that.

IMAG1813.jpg
Setup


Somebody have an idea?

I am scanning at 1920x1200 5fps
-AK
-David Background Panels.
-Logitech QuickCamPro 9000
-Green focusable laser and moving it very slow with one of those kitchen timers...
AlbinKlein
 
Posts: 32
Joined: Tue Oct 28, 2008 8:34 am

Re: Weird lines...

Postby WalterMo » Tue Mar 11, 2014 1:57 pm

Maybe the mechanic of the kitchen timer isn't perfect. Or the laser isn't well fixed at the kitchen timer. Is its cable free hanging down? Better is to fix it at the tripod in a way that only the upper (lightweight) part is moved by the tilted laser.

Also: Decrease the intersection angle, means lower the position of the laser. Test scanning with a lower resolution, e.g. 800 x 600. Then the frame rate will increase.
User avatar
WalterMo
Moderator
 
Posts: 2363
Joined: Mon Apr 02, 2007 6:52 pm
Location: Braunschweig, Germany

Re: Weird lines...

Postby AlbinKlein » Tue Mar 11, 2014 3:15 pm

I am also thinking about the kitchen clock causing the problem as the artifact increases where the parts of the model are closer to the camera when I rotate it, meaning it's having some problems with the rotation causing cyclic rapid movements to the laser.

All the rest is fine though as the latest "perfect" scan, one week ago, had the same setup but anyway I took the advice about the cables, thanks.

Will replace the clock and see how it goes.

Cheers...

PD: any other suggestion is appreciated.
-AK
-David Background Panels.
-Logitech QuickCamPro 9000
-Green focusable laser and moving it very slow with one of those kitchen timers...
AlbinKlein
 
Posts: 32
Joined: Tue Oct 28, 2008 8:34 am

Re: Weird lines...

Postby AlbinKlein » Wed Mar 12, 2014 10:37 pm

Changed the kitchen clock and the lines almost disappeared, not completely but looks pretty good...

Does somebody has a better "McGiver" way to move the laser better?

Thanks in advance:
-AK
-David Background Panels.
-Logitech QuickCamPro 9000
-Green focusable laser and moving it very slow with one of those kitchen timers...
AlbinKlein
 
Posts: 32
Joined: Tue Oct 28, 2008 8:34 am

Re: Weird lines...

Postby WalterMo » Thu Mar 13, 2014 3:25 pm

A stepper motor with an attached gear will do the best job. In our user gallery you will find a lot of examples. E.g. here:
viewtopic.php?f=6&t=1827&hilit

But a stepper needs a special controller with power amplifier to drive it. E.g.:
viewtopic.php?f=6&t=1999


PS. Instead of McGiver you can see how Gyro Gearloose would have solved the problem:
viewtopic.php?f=6&t=3038
User avatar
WalterMo
Moderator
 
Posts: 2363
Joined: Mon Apr 02, 2007 6:52 pm
Location: Braunschweig, Germany

Re: Weird lines...

Postby AlbinKlein » Thu Mar 13, 2014 10:38 pm

Thank you for the links... Is it there any Lego Mindstorm setup? I can't find anything about it...
-AK
-David Background Panels.
-Logitech QuickCamPro 9000
-Green focusable laser and moving it very slow with one of those kitchen timers...
AlbinKlein
 
Posts: 32
Joined: Tue Oct 28, 2008 8:34 am

Re: Weird lines...

Postby WalterMo » Fri Mar 14, 2014 7:25 am

At top right of this site we have the possibility to search something.

Enter 'Mindstorm' and you will find a bit.
User avatar
WalterMo
Moderator
 
Posts: 2363
Joined: Mon Apr 02, 2007 6:52 pm
Location: Braunschweig, Germany

Re: Weird lines...

Postby AlbinKlein » Fri Mar 14, 2014 7:35 am

Well I said "I can't find anything about it" so I did search.
-AK
-David Background Panels.
-Logitech QuickCamPro 9000
-Green focusable laser and moving it very slow with one of those kitchen timers...
AlbinKlein
 
Posts: 32
Joined: Tue Oct 28, 2008 8:34 am


Return to 3D Laser Scanning

Who is online

Users browsing this forum: No registered users and 2 guests

cron