If you have an issue selecting the three initialization points
Initialization is done to define the position of treadmill in reference to the fixed position of the Global Reference
- The first point is always to the rear of the treadmill
- The second is closer to the front, aligned with the first point (parallel to the walking direction)
- The third point is anywhere to the right of the previous point
If you have an issue selecting the first three initialization points, here are a few tips:
Pointer Positioning
Make sure all the spheres on the KneeKG-3D-PointerTM are in the field of view of the NDI camera and that the visibility is not obstructed.
In some cases, the treadmill bar or your hand manipulating the pointer might obstruct the camera’s view.
Optimize the Camera Field of View
Move/tilt the camera slightly to change the field of view. Moving the KneeKG-T-BlockTM calibration tool forward, toward the front of the treadmill might also help.
Avoid the presence of any object (or person) between the NDI Camera and the KneeKG-3D-PointerTM or the KneeKG-3D-Global ReferenceTM.
Visibility of the KneeKG-3D-Global ReferenceTM is required for this step.
Verify the camera positioning
Another option is to move the NDI camera.
- When moving the camera closer, the field of view becomes narrower.
- When moving the camera away, the field of view becomes wider.
- Rotating the camera (left/right) will allow you to see if the global reference is in the field of view or not.
TIPS: Use the NDI track software to ensure that the field of vision (volume) of the NDI camera allows you to see the base of the treadmill.
Optimizing NDI camera positioning
The NDI Track software should be used before starting each assessment to optimize the camera positioning to help keep the trackers in the camera’s field of view and minimize the need for adjustments during the assessment.
Two camera perspectives relative to a treadmill are shown below. The pyramidal outlines show the camera’s field of view: The top perspective shows the bird’s-eye view, and the bottom shows the side view.
