1. A method of detecting the locations of respective image frames contained on an image recording medium, comprising the steps of: (a) scanning said image recording medium so as to produce digital pixel data representative of the contents of each successive scan line of said image recording medium; (b) processing such scanned digital pixel data in accordance with predetermined equations, including a scan line sum predictor equations and at least one of a previous delta predictor equation and a next delta predictor equation to generate a predictor space for frame identifiers; (c) producing a series of thresholds based upon a predetermined percentile of the predictor space; (d) determining all the well formed image frames based upon the thresholds; and (e) using the determined well formed image frames to produce frame statistics which are used to detect the location of image frames other than the well formed image frames.