1. A method of de-interlacing video fields to determine film mode, comprising the steps of: (a) computing frame differences for an input sequence of video fields; (b) computing combing artifacts for said fields; (c) detecting 3-2 pull down using said frame differences together with said combing artifacts; (d) de-interlacing said sequence of video fields using the results of said detecting 3-2 pull down; (e) wherein said detecting 3-2 pull down includes comparing said frame differences to first and second thresholds, comparing said frame differences to minima of sets of previous ones of said frame differences, and comparing said combing artifacts to a third threshold; (f) computing field differences for said fields and detecting 2-2 pull down using said field differences and said combing artifacts; and (g) using the results of said detecting 2-2 pull down and said 3-2 pull down in said de-interlacing to determine film mode.