Skeleton is completely missing

Skeleton is completely missing.

Explanation

There are a few reasons why the skeleton may be completely missing when reviewing a processed movement trial:

1. The Show Skeleton display option is deselected.

If the Show Skeleton option is not selected, the 3D skeleton reconstruction will not be displayed on the 2D videos.

1. The GCVSPL Cutoff Frequency is set too low for the movement.

If the GCVSPL Cutoff Frequency is set too low, it is possible for the moving body to be detected as an outlier and excluded from the tracking. This typically occurs when the movement is very fast and the GCVSPL Cutoff Frequency is set relatively low.

1. The person is not tracked.

If the Max People setting in the Preferences window is set to an integer value (i.e. not No Max) and there are other people who are more visible in the videos, the main person of interest may not be tracked and they will not have a skeleton.

1. The person is not sufficiently visible to be tracked.

If the person is not sufficiently visible in 3 or more cameras due to the camera positioning, orientation, or the quality of the video images, they may not be tracked.

Possible Solutions

Some possible solutions corresponding to the above causes for a completely missing skeleton are as follows:

1. Select Show Skeleton display option.

Select the Show Skeleton display option in the Display dropdown menu.

1. Increase the Smoothing Frequency.

If the cause of the missing skeleton is a low Smoothing Frequency resulting in the entire body being detected as an outlier, try increasing the Smoothing Frequency to allow the movement to be tracked. After adjusting the Smoothing Frequency in the Preferences window, you only need to run the Show Skeleton analysis step to view the updated pose results.

1. Set the Max People setting to No Max.

If the person of interest was not tracked but other people within the videos were, set the Max People setting to No Max to ensure the person of interest is also tracked. After modifying this setting, you only need to run the Run Analysis (without 2D) analysis option to view the updated results.

1. Adjust the camera system setup or move the person to a more visible location within the volume.

If the person is not sufficiently visible to be tracked in the videos, the camera system setup and settings will need to be adjusted to improve the visibility of the person. You may need to move the participant within the capture volume, move or reorient your cameras, or adjust your camera settings to improve the visibility of the participant.