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DLP LCD Projector Composite structured light pattern scanner

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

DLP LCD Projector Composite structured light pattern scanner

Postby lighton » Wed Jul 07, 2010 12:56 am

Can David's code be converted to do this?

Here are a few PDF's that explain how it works. Save them while they are still free. Some of the PDF's on this site are not free- these still are, but who knows for how long.

Dual-frequency pattern scheme for
high-speed 3-D shape measurement


Composite structured light pattern for three-dimensional video
C. Guan, L. Hassebrook, and D. Lau

There's a few video examples embedded in this pdf- I can view them but I cant save them.

I thought this one was pretty neat, they are using two cameras to scan water, after they opauqe it with white paint.
Great video, A PDF file, and some caps so the parts can be examined.


The Wikipedia

Structured-light 3D scanner

Really the bare bones of this involves a Consumer Home Grade DLP LCD projector, a good camera for video capture that uses a firewire connection to the computer.

A video or flash animated creation of the "carrier" and "pmp" line shaped light patterns. A program that examines and calculates deformations made to the projected lines from the recorded video or live video feed that converts those deformed line shapes into point clouds, which is converted into a 3d mesh.

I have a very small understanding of the process involved here.

This system is the best out there. Better than the lasers. The parts are obtainable. The only thing missing is the software to drive/compile it, and the animated video of the proper light patterns. I wish David could do this.
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Joined: Tue Jul 06, 2010 11:30 pm

Re: DLP LCD Projector Composite structured light pattern sca

Postby lighton » Wed Jul 07, 2010 8:05 pm

More tech info on what was used to make the "Dual-frequency pattern high-speed 3-D shape measurement system" ... ision.html

The system consists of a high speed AVT Prosilica GC series VGA resolution camera with Gigabit Ethernet output and a projector. The camera was chosen for its fast frame rates (up to 200 fps at full 640 x 480 resolution) and plug-and-play attributes. A monochrome camera is preferred to a color model for this application as the use of color would impact on the system’s performance since some colors would not be able to reflect on others (e.g. red on green). The projector is composed of a Texas Instrument Discovery 1100 board with ALP-1 controller and LED-OM with 225 ANSI lumens.

The camera is fitted with a Tamron 16mm lens and mounted below the projector. The camera and projector are separated by 10° for optimum area scanning results, and synchronized to operate at 120 frames per second at 640 x 480 resolution using an external triggering circuit. The projected light patterns are loaded directly into the ALP board’s memory.

Heres the youtube video

I think the system used the GE680. ... ge680.html

Obviously this camera is not cheap, but do we really need 200+ frame per second high speed gigacams for static & slow motion controlled model scanning? I think these cameras are locked in low 640x480 res at these frame rates, mainly to capture motion in real time in conjunction with the ultra fast structured light pattern play against these real time motional objects. So we would be looking for higher res, fairly good frame per second camera to suit our needs, no?


The real time 3d liquid scanning system looks like it uses Dalsa cameras- which could be cheaper, but I cant figure out the models name.

I found 2 more webpages on the "Dual-frequency pattern high-speed 3-D shape measurement system" from Kentucky
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Joined: Tue Jul 06, 2010 11:30 pm

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