Skeleton is jittery

Explanation

There are a few reasons why the skeleton may appear to be jittery when reviewing a processed movement trial:

1. The Smoothing Frequency is too high. If the movement is somewhat slow and the Smoothing Frequency is set to a relatively high value, the filter will not be effect in reducing noise in the pose estimations, resulting in noise or jitter in the skeleton.‍

2. The person or body segment is not sufficiently visible. If the person or their body segments are marginally visible, the pose estimates may be unstable resulting in noise or jitter in the skeleton. This can be a result of low resolution, low light, high levels of noise in the video images, and/or challenging clothing/background combinations.

Possible Solutions

Some possible solutions for the above causes of a jittery skeleton include:

1. Reduce the Smoothing Frequency. If the skeleton jitter is due to a relatively high Smoothing Frequency being used for a slow movement, the jitter may be reduced by using a lower Smoothing Frequency. After adjusting the Smoothing Frequency in the Preferences window, you only need to run the Solve Skeleton analysis step to view the updated pose results.‍

2. Use the Enhance Videos tool to improve the video quality. If the videos are too dark or not properly white-balanced, they may be improved using the Enhance Videos tool. This can improve the visibility of body segments and improve tracking quality. After adjusting these settings, you will need to use the Run Analysis button to perform all analysis steps.

3. Adjust the camera system setup to improve participant visibility. 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.