Variable bandwidth control apparatus for separating luminance an

Details Variable bandwidth control apparatus for separating luminance an Variable bandwidth control apparatus for separating luminance an

1991-05-22

1993-03-16

Kostak, Victor R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

051949423

ABSTRACT:
An apparatus for separating a composite video signal into luminance and chrominance signals and the method thereof which comprises: a narrow band pass filter and a wide band pass filter for receiving a primarily comb-filtered composite video signals, respectively; two level detectors for detecting a degree of color change which is a difference between chrominance signals outputted from the band pass filters, respectively, and an amplitude of the chrominance signal outputted from the wide band pass filter, respectively; two coefficient generators for generating respective coefficients corresponding to the values detected from the level detectors; and two multipliers and an adder, for processing respective predetermined interval delayed signals, i.e., the delayed transition chrominance signal and a delayed output signal of the narrow band pass filter, and the coefficients outputted from the coefficient generators. Accordingly, the comb-filtered composite video signal is filtered by changing the bandwidth according to an amplitude of chrominance signal and a degree of color change, thereby minimizing the obstacle factors causing deterioration of the picture quality so as to provide an improved picture.

REFERENCES:
patent: 4389665 (1983-06-01), Nagao et al.
patent: 4626894 (1986-12-01), Harwood et al.
patent: 4916526 (1990-04-01), Faroudja et al.
patent: 5097321 (1992-03-01), Stern et al.

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