Adaptive enhancement of signal-to-noise ratio in television imag

Details Adaptive enhancement of signal-to-noise ratio in television imag Adaptive enhancement of signal-to-noise ratio in television imag

1980-03-24

1981-12-01

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 521

Patent

active

043039430

ABSTRACT:
A noise reduction filter for a television receiver in which two running averages of video signal amplitude are generated over regions of the video picture where the brightness level is substantially constant. One or the other of the averages is used to control intensity to obtain a reduction of random noise in the video signal. In areas of the picture where rapid changes in intensity occur, the averages are not used in favor of the unmodified video signal.

REFERENCES:
patent: 3333055 (1967-07-01), Krause
patent: 3564129 (1971-02-01), Blaxtan
patent: 3602737 (1971-08-01), Radecke
patent: 3621401 (1971-11-01), Young, Jr.
patent: 3715483 (1973-02-01), Limb et al.
patent: 4001501 (1977-01-01), Weimer
patent: 4090221 (1978-05-01), Connor
patent: 4107736 (1978-08-01), Lowry et al.
patent: 4107739 (1978-08-01), Rossi et al.

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