An application to modeling
motion capture data
(Taylor, Roweis & Hinton, 2007)
Human motion can be captured by placing
reflective markers on the joints and then using
lots of infrared cameras to track the 3-D
positions of the markers.
Given a skeletal model, the 3-D positions of the
markers can be converted into the joint angles
plus 6 parameters that describe the 3-D position
and the roll, pitch and yaw of the pelvis.
We only represent changes in yaw because physics
doesn’t care about its value and we want to avoid
circular variables.