Noise reduction system for video signals

Details Noise reduction system for video signals Noise reduction system for video signals

1979-09-20

1980-12-30

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 521

Patent

active

042427053

ABSTRACT:
A recursive noise reduction system for a television system uses the spatial correlation in a frame difference signal derived by element-by-element subtraction of an incoming video signal from corresponding picture elements of a relatively noise-free stored video signal to redue noise in a video signal. The spatial correlation is used to suppress the components of the frame difference signal which are due to frame-to-frame changes in the video resulting from motion in the scene, thus producing a signal which contains substantially only the noise in the incoming video. The noise signal thus derived is subtracted from the incoming video signal to produce a noise-reduced output signal for display or recording. The noise-reduced output signal and the incoming video are added together in varying proportions according to the amount of scene-to-scene motion detected and the sum is stored for use in subsequent treatment of new incoming video.

REFERENCES:
patent: 3962535 (1976-06-01), Haskell
patent: 4047221 (1977-09-01), Yasuda
patent: 4064530 (1977-12-01), Kaiser et al.
patent: 4077053 (1978-02-01), Ishiguro
patent: 4107739 (1978-08-01), Rossi
patent: 4163258 (1979-07-01), Ebihara
patent: 4194219 (1980-03-01), Drewery

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