Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-07-31
1987-08-11
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 38, 358 37, 358 36, H04N 521
Patent
active
046865616
ABSTRACT:
In a composite color video signal, a portion of the signal spectrum is shared by high frequency vertical detail information, and high frequency modulated color difference (I) information. A circuit is described which determines whether the information in the shared frequency band is vertical detail information or color difference information without degradation in the presence of a step input signal, as, for example, in the presence of lettering in the image. A composite video signal is comb filtered to generate comb filtered chrominance and luminance signals. A baseband color difference signal is produced from the comb filtered chrominance signal and the presence of high frequency information in the baseband color difference signal is detected. The bandwidth of the low frequency portion of the comb filtered chrominance signal (i.e. the vertical detail information) which is restored to the comb filtered luminance signal is varied in response to the control signal.
REFERENCES:
patent: 3634615 (1969-06-01), Sasaki et al.
patent: 4072984 (1975-04-01), Kaiser
patent: 4179705 (1978-03-01), Faroudja
patent: 4240105 (1979-08-01), Faroudja
patent: 4262304 (1981-04-01), Faroudja
patent: 4389665 (1981-09-01), Nagao et al.
patent: 4404584 (1983-09-01), Pritchaird
patent: 4472733 (1984-09-01), Bolger
patent: 4590513 (1986-05-01), Craft
Harwood Leopold A.
Patel Chandrakant B.
Wargo Robert A.
Caracappa David N.
Groody James J.
Herrmann Eric P.
Kostak Victor R.
Rasmussen Paul J.
LandOfFree
Vertical detail information restoration circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vertical detail information restoration circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertical detail information restoration circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-406253