Help in Explaining POSIT algorithm (3D maths)

[Anhar Hussain]

Hi guys,

I've been doing some background hobby project based on using a webcam to detect 4 IR LEDs their position is then tracked, using the POSIT algorithm it is possible to calculate the exact location and pose (translation and orientation) of the LEDs.

Anway here is the paper :

http://www.cfar.umd.edu/~daniel/dani...ose25Lines.pdf

it is Daniels DeMenthons classical "POSIT in 25 lines of code"

The maths is a bit too heavy for me, he inlcudes some codes, I was trying to convert this into VB, but that is only half the story,

what I would really like is a detailed numerical example, that I can actually see how it works (the algorithm) because I've tried to understand the mathemtical explantions in the paper but just got confused !

Summay:
(1) A simple numerical example that explains the algorithm
(2) Possibly a VB6 translation (not really that important)

Thanks in advanced!

thanks guys!

[NickThissen]

You might want to try a maths forum instead of a simple maths sub-forum , I can't fully understand it either...

[Anhar Hussain]

damn!

that paper had mathematica code included, I noticed some here know mathematica, I'm wondering if anyone can "reverse" engineer the code to understand it?

Do you know of any maths forums that may be worth a shot?

Anhar,

[NickThissen]

Personally I don't know any math forums, but I do know a good physics forum with a math section, I'm sure you can get some proper help there:
http://www.physicsforums.com/

Or just try googling 'maths forum' or something :P

[VBAhack]

Personally I don't know any math forums, but I do know a good physics forum with a math section, I'm sure you can get some proper help there:
http://www.physicsforums.com/

The math sections of the physics forum are excellent. Very knowledgeable people. Also, here's another possibility:

http://groups.google.com/group/sci.math/topics

[Anhar Hussain]

ok, cheers guys, I'll post on those suggested forums.

hehe if I do get any luck on understanding it, I'll keep you guys posted (if your interested in boring 3d maths like me that is) !

[DanielLH]

I have no knowledge of POSIT, but what you are trying to achieve has already been accomplished by these guys...

http://www.cs.cmu.edu/~johnny/projects/thesis/

I think they have downloadable C# code, which should port to VB quite easily.

Some of their projects are really cool!

Good luck!

[Anhar Hussain]

I am aware of Jonnys work, in fact that was the motivation to start my version, sadly however he's principle is based on the frustrum method which does not do full 6 DOF (does not do y axis rotation).

But thanks for trying man!