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Author Topic: 3D Scanning System  (Read 2639 times)
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mbandala
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« on: March 15, 2008, 04:32:58 16:32 »

My 3D Scanning System

I started this project during the first year of my PhD. I just wanted to share it here.

In this paper we present a scanning system capable of acquiring the shape of 3D objects. A line of light is projected onto the physical objective. The image from a video camera is analysed to estimate the position the surface profile, so that the shape and volume of the object can be derived. The system scans objects at reasonable speeds and creates good-resolution images of the scanned object. The running technique of Laser Triangulation is implemented with a high-resolution camera, a laser diode, and electronics incorporated into a small sensor package that rotates from a fixed position. The resultant data are transmitted to a PC. This 3D system can be used as a auxiliary tool for radiotherapy gating methods that are typically done in one dimension.


Link to my paper


Some screenshots





Scanner components

Theoretically, all you need to build this scanner is:
•   A camera (or webcam)
•   A line laser
•   A stepper motor
•   A programming language to create the interface (I used LabVIEW)
•   Implementation of the algorithm described in the paper

If this project is of any interest to you, please let me know.

Enjoy!

mbandala
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Ichan
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« Reply #1 on: March 15, 2008, 05:51:31 17:51 »

Hi,

Haven't read your paper, a very nice one for sure.

From the photo, it's clear enough that the laser wich is rotated not the object, why?

Where did you got the line laser source? Is it expensive?

Regards, Ichan.
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mbandala
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« Reply #2 on: March 15, 2008, 09:22:33 21:22 »

Line lasers can be a bit expensive. I could afford a $350 one thanks to a research grant. More information here.

The tracking algorithm extracts the 3D position of the illuminated pixels seen by the camera. In other words, you need to sweep the laser line across the object. This can be done by either rotating the object or moving the laser. I chose the latter. You can learn more about the project from the paper.
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amir-vito
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« Reply #3 on: December 05, 2008, 11:55:59 23:55 »

it's so usefull tank you very much
i'm working on a project like this.it's for inspection and vision guided motion control.
www.amir-erfanian.com
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h96089
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« Reply #4 on: January 15, 2009, 07:21:50 07:21 »

If you dont mind to have a clumpsy laser, you can actually get a 0.5W-1W laser from a CD/DVD burner. All you need to do is to keep the lenses that available with on the read head of CD/DVD burner. In my experiment, laser obtain from CD/DVD burner, diverge very little in range of 5 meter. By the way, the reflected ray of this laser from building of distance 3 kilometer away is still visible by user.
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lillbear
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« Reply #5 on: January 15, 2009, 10:07:01 10:07 »

...you can actually get a 0.5W-1W laser from a CD/DVD burner....still visible by user.

Well i have misunderstood something.... i think it is UV-Laser in those burners.

yours
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