Patent ID: 8824802

Claim:
A method of recognizing a gesture of interest comprising: prompting a subject to perform the gesture of interest, wherein a sequence of baseline depth images with three-dimensional baseline positions of feature points are associated with the gesture of interest; obtaining from a depth sensor a plurality of depth images of the subject making movements; identifying a first set of three-dimensional positions of a plurality of feature points in each of the plurality of depth images; projecting the first set of three-dimensional positions of the plurality of feature points onto a constrained three-dimensional model for each of the plurality of depth images; mapping the first set of three-dimensional positions of the plurality of features using the constrained model for each of the plurality of depth images independently of the other plurality of depth images; determining whether the mapped first set of three-dimensional positions of the feature points are quantitatively similar to the three-dimensional baseline positions of feature points in the one or more baseline depth images of a pre-determined gesture; independently comparing the mapped first set of three-dimensional positions of the plurality of feature points for each of the plurality of depth images to the three-dimensional baseline positions of feature points in the sequence of baseline depth images for the gesture of interest as each of the plurality of depth images is obtained; determining a tracking score based on the comparing; and determining that the subject is performing the gesture of interest if the tracking score remains within a given threshold.