Impulse noise elimination in NTSC color television signals using Rank-Order Filters.
Kazumasa Kobayashi, Hideki Kokubun, Kazuyuki Akechi, Masahide Abe, Kiichi Kobayashi · The Journal of The Institute of Image Information and Television Engineers · 1990
In this paper, a Rank-Order Filter (ROF) and its application to TV signals are discussed.In order to apply ROF to eliminate impulse noise from NTSC color TV signals, we propose: a) kernal structure suitable for NTSC composite signals; b) theoretical analysis of ROF noise elimination characteristics; c) subjective evaluation method for noise elimination from realtime TV signals .In addition, an experimental noise elimination setup and experimental results of subjective evaluation using ROF LSIs we have developed is described.Finally, it is confirmed that(a)it is effective for NTSC composite signals to employ a kernel in a temporal direction where signals of the same phase color-subcarrier can be sampled and that (b) the results of subjective evaluation are consistent with the calculated results of theoretical analysis.1.