Patent ID: 6243106
Filing Date: 2001-06-05
Classification: G06K,G06T

Abstract:
A computerized method for tracking a moving articulated figure in a sequence of 2-D images, comprising the step of:registering a pose of the figure in each image of the input sequence using a 2-D scaled prismatic model (SPM) to produce a state trajectory for the figure in the input sequence,the SPM comprisinga plurality of prismatic links connected by revolute joints having a connectivity identical to connectivity of the figure, each link having at least two degrees of freedom including, in the image plane, rotation in the image plane about an axis at a base joint of the link, and scaling along the link's prismatic axis, anda plurality of templates, a template associated with each link, each template including a plurality of image measurements representing a portion of the articulated moving figure, each template rotating and uniformly scaling responsive to rotation and scaling of the associated link, andthe state trajectory comprisinga sequence of SPM state vectors, each SPM state vector comprising SPM state parameters describing rotation and scaling of the SPM links for the figure in a corresponding image;globally reconstructing kinematic parameters of a 3-D kinematic model that best fit the state trajectories, the 3-D kinematic model representing 3-D movement of the articulated figure in the input sequence of 2-D images.