THREE LINE CORRELATION DETECTOR

摘要

PROBLEM TO BE SOLVED: To reduce dot disturbance and longitudinal chain noise occurring in a three line comb filter. SOLUTION: When a vertical correlation is detected and a color signal for obtaining an optimal luminance signal is switched adaptively, erroneous operation is prevented by detecting a longitudinal line/oblique ling signal having a large amplitude level of a Y signal liable to erroneous operation and longitudinal chain noise of small signal is reduced.