Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-06-04
1993-12-07
Powell, Mark R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 5213
Patent
active
052687600
ABSTRACT:
The noise eliminating circuit for a television receiver according to the present invention outputs an image signal without any noise by detecting and eliminating impulse noise and effecting interpolation for an image signal, in the case where C/N of a received signal is lowered and impulse noise is produced. The noise eliminating circuit stated above is a noise detecting circuit, which detects only the noise component and judges whether the C/N is such that impulse noise is produced or not, depending on the level of the detection output. In the case where it is judged that there exists an impulse noise, a noise reduction circuit detects an impulse noise portion in the image signal and a brightness signal and a chrominance signal of this portion are subjected to interpolation processing so that an image signal, from which the impulse noise component is removed.
REFERENCES:
patent: 4682230 (1987-07-01), Perlman et al.
patent: 4987481 (1991-01-01), Spears et al.
patent: 5005081 (1991-04-01), Asano
patent: 5161018 (1992-11-01), Matsunaga
Perlman, s.s.; "Adaptive Median Filtering for Impulse Noise Elimination in Real-Time TV Signals", IEEE Transactions on Communications, vol. Com-35, No. 6, Jun. 1987, pp. 646-652.
Clarion Co. Ltd.
Powell Mark R.
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