Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1991-08-26
1993-08-31
Kostak, Victor R.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 40, H04N 968
Patent
active
052413705
ABSTRACT:
An arrangement and method for reducing the noise component of a television picture chrominance signal, using a vertical digital filter. A noise-reduced reference signal is formed from the chrominance signals of vertically preceding lines. A difference signal is derived, wherein the noise-reduced reference signal, entering into the calculation of the difference signal, is created by the recursive signal processing operations of the digital filter. The transversal signal-processing operations of the digital filter affects the reduction of the noise component. The difference signal, before passing through the recursive and transversal signal-processing operations, is applied to a limiter. The limiter introduces an amplitude-dependent attenuation to obtain a modified difference signal. The modified difference signal enters into the recursive and transversal signal-processing operations instead of the original difference signal.
REFERENCES:
patent: 4926361 (1990-05-01), Ohtsubo et al.
patent: 5047840 (1991-09-01), Miki
patent: 5047866 (1991-09-01), Watanabe et al.
patent: 5060056 (1991-10-01), Miki et al.
Deutsche ITT Industries GmbH
Kostak Victor R.
Peterson Thomas L.
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