“…To help track the motion of the wing, markers can be added to the wing to be better detected by the cameras. This can include strips of tape or lines [17,43]; markers on the roots, tips [34] and/or the spars [30,55]; and colored or reflective markers [48,54]. Alternatively, systems use a coating on the entire wing to allow the full motion of the wing to be observed in imagery, such as in [69,70].…”