Noise reduction circuit arrangement of solid-state video camera

Details Noise reduction circuit arrangement of solid-state video camera Noise reduction circuit arrangement of solid-state video camera

1983-10-18

1986-05-06

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358904, H04N 5217

Patent

active

045875618

ABSTRACT:
A noise reduction circuit arrangement for video signals under low brightness condition has a high-pass filter which detects the level of a video signal to switch the amount of passage of a high-frequency band component in accordance with a magnitude of the level. The video signal, produced from an image pickup element, is supplied to a low-pass filter and the high-pass filter. The high-frequency band component produced from the high-pass filter and changed in amplitude in accordance with the level of the video signal and a low-frequency band component produced from the low-pass filter are added at an adder so as to effect aperture correction in principle. The high-frequency band to be added is so controlled as to more decrease when the brightness of the video signal is low than when the brightness is not low.

REFERENCES:
patent: 2717931 (1955-09-01), Duke
patent: 3333055 (1967-07-01), Krause
patent: 3872387 (1975-03-01), Banach

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