Video noise reduction system

Details Video noise reduction system Video noise reduction system

1979-03-26

1981-02-03

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 521

Patent

active

042492106

ABSTRACT:
Reduction of noise in a television signal is achieved by comparing signals from successive scans to produce a difference signal. Low amplitude differences are assumed to represent noise and are attenuated. Differences above a predetermined level are assumed to represent movement and are not so attenuated. The attenuation is achieved by a multiplier which receives as multiplier the output of a non-linear transfer characteristic element. The non-linear element receives the differences after rectification and after passing through a variable-gain element. The non-linear element is such that above a predetermined value a constant predetermined minimum attenuation factor applies. A noise measurement circuit measures the noise present in the difference signal and controls the gain of the variable-gain element accordingly. Several noise-measurement circuits may be provided, a selected one of which is used in dependence upon the magnitude of the input signal to the apparatus.

REFERENCES:
patent: 4058836 (1977-11-01), Drewery
patent: 4058836 (1977-11-01), Drewery et al.
patent: 4064530 (1977-12-01), Kaiser et al.

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