Center of mass state vector for analyzing user motion in 3D images

摘要

Techniques described herein determine a center of mass state vector based on a body model. The body model may be formed by analyzing a depth image of a user who is performing some motion. The center of mass state vector may include, for example, center-of-mass position, center-of-mass velocity, center-of-mass acceleration, orientation, angular velocity, angular acceleration, inertia tensor, and angular momentum. A center of mass state vector may be determined for an individual body part or for the body as a whole. The center of mass state vector(s) may be used to analyze the user's motion.

主权项

1. A method, comprising:
accessing, by a processor, image data that tracks a user; forming, by the processor, a body model for the user that includes a plurality of body parts based on the image data; computing, processor, a center of mass for different ones of the body parts; determining, by the processor, a center of mass state vector for each of the plurality of body parts, the center of mass state vector for each of the body parts comprises position of the center of mass of the body part, velocity of the center of mass of the body part, orientation of the body part, and angular velocity of the body part; and determining, by the processor, a center of mass for the user as a whole based on the center of mass of the different body parts.