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summary: markers for videotracking

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  • summary: markers for videotracking

    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

    ########################

    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

    #########################

    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

    ###############################

    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
    ##################################

    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

    ######################################

    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

    #######################################

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