Patent ID: 7177446
Filing Date: 2007-02-13
Classification: G06T

Abstract:
1. A method of tracking a feature across a sequence of image frames, each said image frame comprising a two-dimensional array of pixel data, said method comprising the steps of: (a) estimating a current feature position in a current frame from at least a previous feature position in a previous frame; (b) extracting feature data from pixel data of said current frame that are substantially around said current feature position; (c) determining whether a first predetermined criterion has been met, said first predetermined criterion being whether a difference between said feature data and reference data is larger than a first predetermined number which indicates that track of said feature has been lost; (d) determining whether a second predetermined criterion has been met, said second predetermined criterion being whether a number of frames for which a loss of track has not been indicated equals a third predetermined number; and (e) updating said reference data with feature data of a plurality of frames upon determining that said first predetermined criterion has not been met and said second predetermined criterion has been met.