Apparatus for separating luminance and color signals by detectin

Details Apparatus for separating luminance and color signals by detectin Apparatus for separating luminance and color signals by detectin

1993-07-29

1994-12-13

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Chrominance-luminance signal separation

348666, H04N 978

Patent

active

053733282

ABSTRACT:
An apparatus for separating luminance and color signals from a composite video signal, which is capable of suppressing a cross luminance phenomenon of the luminance signal and a cross color phenomenon of the color signal. The apparatus comprises a first color signal detecting circuit for detecting a first color signal from the composite video signal, the first color signal suppressing a cross luminance phenomenon of the luminance signal from the composite video signal, and a second color signal detecting circuit for detecting a second color signal from the composite video signal, the second color signal suppressing a cross color phenomenon of the color signal from the composite video signal. The first color signal is selected when the color signal of the composite video signal has a large amplitude and no diagonal variation. The second color signal is selected when the color signal of the composite video signal has a small amplitude and the diagonal variation. Therefore, a definition of the picture can be obtained by suppressing the cross color phenomenon of the color signal and the cross luminance phenomenon of the luminance signal.

REFERENCES:
patent: 4688080 (1987-08-01), Wagner
patent: 4893176 (1990-01-01), Faroudja
patent: 4994906 (1991-02-01), Moriwake
patent: 5194942 (1993-04-01), Sim et al.

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