Validity and Reliability of Upper Limb Functional Assessment Using the Microsoft Kinect V2 Sensor

Table 2

The upper arm and torso anatomical segment coordinate systems for the Kinect V2 system.

Name		Definition
Torso	Origin	SpineShoulder
	X	Unit vector perpendicular to two vectors (Y and the vector from ShoulderRight to ShoulderLeft)
	Y	Unit vector going from SpineMid to SpineShoulder
	Z	Unit vector defined by the -axis and the -axis to create a right-hand coordinate system
Right upper arm	Origin	The elbow joint center (ElbowRight)
	X	Unit vector perpendicular to the -axis and the -axis, pointing anteriorly
	Y	Unit vector going from the elbow joint center to the shoulder joint center (ElbowRight to ShoulderRight)
	Z	Unit vector perpendicular to the plane formed by the -axis of the upper arm and the long-axis vector of the forearm