Abstract: A method of image processing for tracking a subject in a sequence of image frames using predefined criteria for classifying image regions as potentially being part of the tracked subject includes steps for obtaining, for a first image frame, a record of an image region previously designated as containing the tracked subject, classifying image regions of a second image frame in accordance with the defined criteria to thereby generate classified image regions, and updating the designated image region associated with the second image frame with reference to both the classified image regions in the second image frame and the previously designated image region in the first image frame. Tracking the subject though a sequence of image frames permits processing the portion of the image frames corresponding to the subject at a relatively high resolution while processing the background at a relatively low resolution so as to maximize image processing for regions containing the subject.