1. A method of classifying objects from image frames, the method comprising: using a computer to perform the elements of: applying an intra-frame feature based object classifier to objects within each image frame to identify object classes for objects in the frame; applying an inter-frame object classifier to persistent objects in sequence of frames to identify object classes for objects in multiple frames; and applying a sequential classifier to multiple sequential frames to classify an object as a function of the classifications by the feature based object classifiers.