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Patent EP0455434A2 successfully refreshed from Google Patents.
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EP0455434A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Noise reducers

Assignee: Sony Corp
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Filing: 1991-04-26
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Granted: —
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Expires: 2011-04-26
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Abstract

Abstract A noise reducer of a signal receiving circuit system applying different manners of signal processing to moving video image regions and still video image regions, the noise reducer detecting (2) a two-frame difference signal of a received video signal and subtracting (2A) the two-frame difference signal from the received video signal thereby reducing remaining noise in the still video image region. The proportion of the two-frame difference signal to be subtracted (2A) is controlled (9) by the noise level (8E) of the received video signal and a signal (7) obtained in accordance with the amount of motion in the received video signal.

Inventors

  • 👤 Osamu C/O Patents Division Matsunaga

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 13:36
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N5/00; H04N5/14; H04N5/21

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 153 words
A noise reducer for processing a received video signal, the noise reducer comprising: detection means (2) for detecting a difference signal between the undelayed and two-frame delayed signals of said received video signal; subtraction means (2A) for subtracting said difference signal from said received video signal; noise reduction means (2, 2A) comprising said detection means (2) and said subtraction means (2A) for subtracting remaining noise in a still video signal region obtained by said subtraction means (2A) from the received signal; noise level detection means (8E) for detecting the noise level of the transmitting system of said video signal; motion level detection means (7) for detecting motion in said video signal; and control means (9) for controlling the subtraction ratio of said difference signal obtained by said detection means (2) within said noise reduction means, said ratio being controlled by a control signal generated in accordance with said noise level and said motion.
Claim 2
Dependent Claim 33 words
A noise reducer according to claim 1 wherein said received video signal comprises the still video image and motion video image regions, each of said regions being processed by a differential processing method.
Claim 3
Dependent Claim 22 words
A noise reducer according to claim 1 or claim 2 wherein said difference signal is a noise component of said video signal.
Claim 4
Dependent Claim 31 words
A noise reducer according to claim 1, claim 2 or claim 3 wherein motion level detection means (7) is supplied with a one-frame-delayed and a two-frame-delayed signal of said video signal.
Claim 5
Dependent Claim 24 words
A noise reducer according to any one of the preceding claims wherein said received video signal is a television signal of the MUSE system.

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