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Dipl.-ing. Gunther Paul
01-30-1997, 08:48 PM
Hi,

thank you all who answered to my question about european producers of markers
for videotracking. You were a great help.

I received 3 different types of advice:

1. Build them myself - see answers below
2. Buy them from producers like Ariel Dynamics, BTS, Qualysis....
3. I received adresses of users for further information

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Wir verwenden Reflexfolien der Firma 3M (Niederlassung Wien). Fuer 3D
Marker verwenden wir Styroporkugeln, auf die wir die Reflexfolie in
Streifen aufkleben.

Mit freundlichem Gruss
Dipl. Ing. Dr. Christian Peham

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We have a PRIMAS system from Delft and produce the markers ourselves. I
would suggest you to do the same, as you can make the best solution.
We got a sheet of Scotch 7610 retroreflective material from the
manufacturer which has an adhesive cover on the back side. We
made stripes and attached them on the surface of spheres. For big markers
we used ping-pong balls and for small markers different size beads.
Finally, the covered markers were sewed or glued to elastic rubber which
can be fastened to the required anatomical landmark point easily.
I saw some ready - made (and very expensive) markers which seemed to have
been fabricated with much less care.

With best regards,
Akos

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I saw your request for companies selling markers on BIOMCH-L. They are
considerably more expensive to buy than to make yourself. This question
came up some time ago, I believe on this list. You may be able to find the
replies from the archives. Basically all you need is small wooden spheres
and wooden disks (you can find in any craft shop) some reflective tape (the
3M corporation sells rolls of it) and a little glue. Glue the sphere onto
the disk, cut small strips of the reflective tape (about 1/2 cm wide) and
apply them on the sphere until it is covered. Use double sided adhesive
electrode washers to attach the disk to the subject.

Good luck!
BE
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3M do just about anything you could want. Alternatively, cheap is the
local fabric shop who sells reflective tape for sewing into high
visibility jackets (eg. police/road workers).

Good Luck
Tim Lawes

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If you want cheap markers, you can build them yourself from 3M
reflective tape and a styrofoam ball. This is definiitely the
cheapest, and is the way some companies make them.

Neil

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Dipl.-Ing. Gunther Paul
Ergonomics
TH Darmstadt
paul@hrz1.hrz.th-darmstadt.de