Managing letterbox signals with logos and closed captions.

摘要

A video display control system comprises: a video display having a wide format display ratio; a letterbox detector (100) for sampling video information in pictures represented by input video signals having a letterbox format and generating a control signal (LTRBX_BEG) for enlarging the pictures for substantially filling the video display means with active video; and, a first control circuit (128) for restricting operation of the letterbox detector to a vertical range of horizontal lines in each field of the video signal; and, a second control circuit (101) for restricting operation of the letterbox detector to a horizontal range of video data in each of the horizontal lines.