Patent ID: 7330566

Claim:
A method for determining height parameters that describe a dynamically varying height of an ambulatory subject based on video analysis of the subject, comprising: acquiring a sequence of images that collectively captures a gait of the subject, wherein the gait comprises cadence and stride length; computing cadence, wherein C=120×frames in seconds/T, C=cadence, T=period of the subject's gait in frames per cycle; computing stride length, wherein L=W/n/T, L=stride length in meters, W=distance traveled along a path in meters, n=number of frames used in performing analysis, T=period of the subject's gait in frames per cycle and n/T=number of gait cycles that subject traverses over n frames; measuring a dynamically varying height function of the subject based on an analysis of the varying height of the subject in the sequence of images; fitting the dynamically varying height function of the subject to a model that describes varying height; and identifying the subject based on the gait and the height; wherein the height parameters correspond to parameters used in the model.