Part of scaling is the adjustment of markers to better match the measured marker position.
How is a particular marker position being adjusted by running the IKMarkerTask? I thought that the result of the IKMarkerTask are generalised coordinates (i.e. joint angles) and not marker coordinates.
Many thanks for providing help!
Regards, Katja
Scaling: adjustment of marker position
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Katja Oberhofer
- Posts: 8
- Joined: Mon Feb 04, 2008 11:11 pm
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Ayman Habib
- Posts: 2240
- Joined: Fri Apr 01, 2005 12:24 pm
RE: Scaling: adjustment of marker position
Hi Katja,
You can think of the markers as split into two groups, one group refers to "anatomical" landmarks we trust (e.g. joint centers) and is used for computing the scale-factors, the other group is used in later steps only (e.g. IK) and are placed on loose soft tissue so their locations in the model and during the trial may not coincide.
After scaling the model utilizing the first group, the markers in the second group are moved to match a static trial (or a portion of).
Please consult the User's Guide section on Scaling for more details and let us know if you have any questions.
Best,
-Ayman
You can think of the markers as split into two groups, one group refers to "anatomical" landmarks we trust (e.g. joint centers) and is used for computing the scale-factors, the other group is used in later steps only (e.g. IK) and are placed on loose soft tissue so their locations in the model and during the trial may not coincide.
After scaling the model utilizing the first group, the markers in the second group are moved to match a static trial (or a portion of).
Please consult the User's Guide section on Scaling for more details and let us know if you have any questions.
Best,
-Ayman