Error correction arrangement for imagers

Details Error correction arrangement for imagers Error correction arrangement for imagers

1983-01-17

1984-11-06

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358163, H04N 536, H04N 521

Patent

active

044815395

ABSTRACT:
Two or more CCD imagers, which have random defects are optically coupled to form a single image. The CCD's are in registry. Because of the random nature of the location of the defects, the defective photosensors of one imager are aligned with good photosensors of another. Memories keep track of which locations of which CCD are defective. The imagers are operated synchronously and the signals from good photosensor locations are summmed for improved signal-to-noise ratio. When a location is addressed at which one imager has a defective photosensor, the respective memory decouples it from the good photosensor of the other imager. The signal level is restored for that pixel by increasing the gain of a preamp by the correct amount. If the imagers are made from the same mask, they may have almost identically corresponding defective photosensors. Then one imager is mounted upside-down relative to the other and scanned backwards so the defects do not coincide.

REFERENCES:
patent: 3624286 (1971-11-01), Bosomworth
patent: 3856989 (1974-12-01), Weimer
patent: 3904818 (1975-09-01), Kovac
patent: 4036690 (1977-07-01), Hoagland
patent: 4145721 (1979-03-01), Beaudouin
patent: 4220971 (1980-09-01), Lambeth
patent: 4237488 (1980-12-01), Takemura

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