Patent ID: 7127081
Filing Date: 2006-10-24
Classification: G06K,G06T

Abstract:
1. A method for tracking motion of a face comprising the steps of: determining the calibration parameter of a camera; marking salient features of an object with markers for motion tracking; acquiring a plurality of initial 2-D images of the object; calculating 3-D locations of the salient features of the object in accordance with the calibration parameter of the camera; calculating 3-D locations of the global and local markers in the neutral state; and calculating 3-D locations of the local markers in each action state; receiving a chronologically ordered sequence of 2-D images of the object; storing or transmitting tracked motion of the object; calculating the 3-D locations of the local markers in each action state by estimating the orientation and position of the face in each 2-D image of the action state to conform to the 3-D and 2-D locations of the global markers under a perspective projection model and calculating the 3-D locations of the local markers to conform to the estimated orientation and position of the face and the 2-D locations of the local markers under a perspective projection model.