1. A method for use with a stream of images defining a video, the method comprising the steps of: periodically conducting a face finding operation such that face finding operations are carried out on more than one images in the stream; comparing the results of the face finding operations to identify occurrences wherein a face found by the face finding operation in an image is not found by the face finding operation in a following image; in the following image, using a tracker based upon wavelet decomposition to attempt to find the face, the tracker using the last image in the stream in which the face was found by the face finding operation.