Y/C separator using 3-D, 2-D and 1-D filters

Details Y/C separator using 3-D, 2-D and 1-D filters Y/C separator using 3-D, 2-D and 1-D filters

1993-11-08

1995-12-05

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348670, H04N 978

Patent

active

054733898

ABSTRACT:
A Y/C separating filter apparatus for outputting a carrier chrominance signal and a luminance signal from a color video signal supplied thereto comprises first and second three-dimensional filters for subtracting the color video signal and signals of one or two- frame period-advanced or delayed signals from each other to obtain first and second carrier chrominance signals, a selector circuit for selecting the first and second carrier chrominance signals and an average third carrier chrominance signal to obtain the carrier chrominance signal, and a judging circuit for judging first and second correlations between the color video signal and first or second frame period-advanced or delayed signals, wherein the selector circuit is selected in response to a judged result of the judging circuit, the selector circuit selects the first carrier chrominance signal when the first correlation is higher than the second correlation, the selector circuit selects the second carrier chrominance signal when the second correlation is higher than the first correlation, and the selector circuit selects the third carrier chrominance signal when the first and second correlations are substantially equal to each other.

REFERENCES:
patent: 4617589 (1986-10-01), Weckenbrock
patent: 4930012 (1990-05-01), Fujita
patent: 4972259 (1990-11-01), Motoe et al.
patent: 5093715 (1992-03-01), Tokuhara et al.
patent: 5097321 (1992-03-01), Stern et al.
patent: 5155582 (1992-10-01), Tokoi et al.

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