1. A method for detecting a pull-down field in a stream of video fields, the method comprising: generating an array of variance indications, each of the variance indications representing a degree of variance between two video fields in the stream of video fields; comparing the array of variance indications to a plurality of predetermined patterns to detect a pull-down video field in the stream of video fields; and maintaining respective indications of a freciuencv at which each of the plurality of predetermined patterns correlates to the array of variance indications.