Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-08-03
1991-01-08
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
35821331, H04N 314, H04N 5335
Patent
active
049840851
ABSTRACT:
An CCD image sensor includes a number of detector sites which are shielded from exposure to light so as to produce an output signal indicative of the dark current from the sensor. The output signal from the sensor is digitized into a series of multi-bit numbers. As dark current picture elements are clocked from the sensor, a logic circuit detects when any one of several least significant bits of the multi-bit digitized sensor output signal has a given logic level. A switch, controlled by the logic circuit, applies a constant current to charge a capacitor so that the voltage across the capacitor will represent the magnitude of the dark current in the sensor output signal. The capacitor voltage is subtracted from the sensor output to provide an image signal in which the effects of the dark current are compensated.
REFERENCES:
patent: 4128830 (1978-12-01), Weythman
patent: 4216503 (1980-08-01), Wiggins
patent: 4489349 (1984-12-01), Okada
patent: 4525741 (1985-06-01), Chahal et al.
patent: 4602291 (1986-07-01), Temes
patent: 4625330 (1986-11-01), Higgins
patent: 4628362 (1986-12-01), Waehner
patent: 4754338 (1988-06-01), Hideshima
patent: 4786969 (1988-11-01), Shouji et al.
patent: 4819071 (1989-04-01), Nakamura
Allen-Bradley Company Inc.
Greening Wendy R.
Groody James J.
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