抄録
The line difference signal obtained from a 525 line 16 : 9 aspect ratio progressive camera is transmitted in the EDTV-II letter box system on the upper and lower panels as a helper signal. This line difference signal sometimes annoys viewers watching conventional televsion because of the signal's high amplitude. Many visibility-reduction methods have been proposed so far. In this paper, a correlation-based method that uses the main panel signal and the line difference signal generated by a symmetric short kernel filter is described. By using this method, the spectrum of the line difference signal is modified. We made the encoder and decoder for this method and checked the methods effects through a computer simulation. This correlation-based method is further improved and adopted as one visibility reduction method for the EDTV-II standard.
