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This information is for Vicon Nexus 2.5. For up-to-date help, see the latest Nexus documentation.

Nexus PDFs

Location: Pipeline Tools pane > Subject Calibration section > Update Skeleton Parameters pipeline operation

The standard workflow for creating a custom VST uses a static trial, which, for this workflow, is easier to work with than a movement or ROM trial. However, a static trial does not provide skeleton parameters that are likely to be representative of a movement trial, so are unlikely to produce the best initial label booting. This initial label booting can be improved by providing more representative data from a movement or ROM trial. The Update Skeleton Parameters operation enables you to do this by updating the default values of a selected skeleton with movement or ROM trial data contained in the current calibrated labeling skeleton (VSK).  

To initialize a custom VST from a VSK:

  1. Ensure a calibrated VSK from a subject who performed a movement or ROM trial is active.
  2. In the Pipeline Tools pane, expand Subject Calibration and double-click the Update Skeleton Parameters pipeline operation to add it to the current pipeline.
  3. In the Properties pane, select the parameters that are to be updated:
    • Update Marker Covariances Marker covariance is used by the labeler to account for skin motion, so the default for this option is Selected.
    • Update Parameters If you have calibrated a skeleton from the Labeling Template Builder, select this check box.
    • Update Joint Mean & Covariance Joint covariance is used in booting the labeling. If you have a very flexible subject, a larger covariance will help, so select this check box. 
    • Update Joint Ranges Joint ranges can be enforced to detect infeasible joint angles. If you have a very flexible subject, larger joint ranges are needed, so select this check box. 
  4. Run the pipeline or the individual operation as required.
    The selected parameters are updated with the values from the calibrated VSK.
  5. Create a labeling skeleton template (VST) from the active labeling skeleton (in the Subjects Resources pane, right-click the subject and then click Save Labeling Skeleton As Template).
  6. Use the newly created VST to label the movement trials of the subject.