System for reducing noise in a television signal

Details System for reducing noise in a television signal System for reducing noise in a television signal

1984-02-23

1985-09-03

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358 36, H04N 521, H04N 514

Patent

active

045395942

ABSTRACT:
The amount of noise reduction of a television signal produced by averaging corresponding pixels from one frame to the next is reduced by a correction factor when motion in the picture is detected. In order to prevent very active motion from disturbing detection of the noise level, a noise level measurement signal is subjected to a hold of its value in a time briefly preceding a highly active motion in the picture until a time shortly after the end of such highly active motion. The motion signal is processed so as to provide such a hold only when motion is highly active in the picture, and that signal is prolonged in a further circuit so that it will have a duration long enough to cover build-up of that motion and its trailing off, when the noise measurement signal is delayed by about half of the prolongation, so that the noise measurement level that is held corresponds to the noise level prior to the buildup of the motion which shortly thereafter becomes highly active. The noise value thus held controls the size of the correction factor (k) produced by the presence of the motion signal.

REFERENCES:
patent: 4242704 (1980-12-01), Ito et al.
patent: 4296436 (1981-10-01), Achiha
patent: 4485403 (1984-11-01), Illetschko

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