Re: [CAD_CAM_EDM_DRO] Re: Camera Software

This discussion is interesting.

I've read a little bit about the field. Using a camera to make measurements
is called photogrammetry. e.g.
http://en.wikipedia.org/wiki/Photogrammetry
http://scholar.google.com/scholar?q=photogrammetry&ie=UTF-8&oe=UTF-8&hl=en

I've even bolted a digital camera and a laser pointer onto a mill or other cnc
system, such as a reprap, to scan an object in order to do "object
reconstruction" The laser pointer is directed at a glass rod to create a fan
shaped plane of light. The postioning system scans the object, software
processes the scan data and creates a .stl file, and a mill or reprap
recreates the object. It's called structured light scanning.
http://en.wikipedia.org/wiki/3D_scanner#Structured_light

You can buy scanners, scanning heads for cnc systems, and software. I'm
interested in making and documenting a system.

links:
http://www.dubsen.org/twiki/bin/view/Main/RepRapLaserScanningHead
http://splinescan.co.uk/
http://scholar.google.com/scholar?hl=en&lr=&q=object+reconstruction&btnG=Search

Along with the obvious applications to reprap, I'd like to build a 3D scanning
head in order to scan oil clay models of jewelry or sculpture.

-Sebastien

On Tuesday 01 August 2006 16:54, ED MAISEY wrote:
> Hi Dennis,
>
> In my days it was called a shadowgraph, I wouldnt mind betting you could
> pick one of those up used at a very reasonable price, and they were fairly
> accurate,
>
> ...........................Edmund......................
>
> Neil Gillies <neil@...> wrote:
> Hi Dennis
>
> The semiconductor world is full of this stuff - on a small scale of
> course but the technology is the same.
>
> Here's a link to probably one of the best systems ...
>
> http://www.muetec.com/products/wafer/muetec-100.php
>
> Don't get too anal about lens distortion, it's amazing what some
> simple algorithms can correct for and
> the accuracy that can be achieved is absolutely mindboggling.
> Oh - and an encoder isn't needed either for short measurements :-))))
>
> Have fun
>
> Neil
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
> ........Edmund.........
>
>
> [Non-text portions of this message have been removed]
>
>
>
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