Optimize a custom labeling skeleton template

When you created your custom labeling skeleton template, you captured a static trial (see Capture and reconstruct the marker set). Static trials are easier to work with than movement or ROM trials when using the Nexus skeleton-building workflow (see Create the skeletal structure). However, a static trial does not produce skeleton parameters that are likely to be representative of the movements to be captured in the dynamic trial, so it may not produce the best labeling. To improve labeling, you can provide more representative data by capturing and calibrating a movement or ROM trial. Nexus can then use the data from the movement or ROM trial to update the labeling skeleton template (VST).

To optimize a custom VST:

1. Capture a ROM trial. To do this:
   1. With Nexus in Live mode, in the Subject Preparation pane , click Start in the Subject Capture section.
      The Start button label changes to Stop.
   2. Have the subject hold the base pose for one second and then move the segments within the VST through as full a joint range as possible. To produce the best calibration and auto-labeling, ensure that each joint is moved through a range that represents the movement that is likely to be captured during movement trials.
   3. Click Stop to finish the capture.
2. Attach your custom skeleton labeling template (VST) to your subject (see Create a new subject from a template in the Vicon Nexus User Guide).
3. Reconstruct and label the ROM trial, using AutoInitialize, plus any manual labeling that is necessary. 
   
4. To calibrate the ROM trial, run a Functional Skeleton Calibration pipeline operation. This operation optimizes the skeleton parameters used for autolabeling, including joint and marker positions for the whole trial, and calculates joint and marker statistics.
5. After you have run this operation, to provide good initial values for labeling, you update the default values of the VST with the ROM trial data contained in the current calibrated labeling skeleton (VSK). To do this, run an Update Skeleton Parameters operation.

You can now save the custom VST (see Save a custom labeling skeleton template).