Low noise black level reference for CCD imagers

Details Low noise black level reference for CCD imagers Low noise black level reference for CCD imagers

1983-04-07

1985-10-22

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, H04N 314

Patent

active

045492158

ABSTRACT:
Low frequency streaking noise which is effected by modulating the black reference with high frequency noise is eliminated from the displayed picture in a television system by switching the signal during the horizontal blanking interval to a noise-free black reference. A CCD or other imagers where a pixel-by-pixel reference is available provide a unique opportunity to eliminate low frequency streaking in the video display. Each pixel of a solid state imager includes a black level reference. In accordance with the invention, a switch circuit is added to a correlated double sampling system used in conjunction with a CCD imager. During the horizontal blanking interval the switch is rendered conductive to substitute a noise-free reference derived from the pixel clamp.

REFERENCES:
patent: 4435730 (1984-03-01), Bendell
patent: 4463383 (1984-07-01), Soneda
patent: 4466018 (1984-08-01), Soneda
patent: 4496982 (1985-01-01), Levine
patent: 4499497 (1985-02-01), Levine

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