Image processing device for correcting an offset of an image sig

Details Image processing device for correcting an offset of an image sig Image processing device for correcting an offset of an image sig

1993-12-15

1995-04-18

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358446, 348241, 348677, H04N 141

Patent

active

054083354

ABSTRACT:
An image signal sent from an image sensor is input to the inverting terminal of a differential amplifier. An A/D converter converts an output of the differential amplifier to digital output data. A comparison circuit compares the digital output data with a reference value in a dummy bit period to produce a comparison result, for instance, a difference between the digital output data and the reference value. Based on the comparison result, a correction value setting circuit modifies a correction value so that a DC offset becomes closer to the reference value. For example, the correction value setting circuit adds the difference obtained by the comparison circuit to the correction value. A D/A converter converts the modified correction data to an analog voltage, which is input to the noninverting terminal of the differential amplifier.

REFERENCES:
patent: 4660082 (1987-04-01), Tomohisa et al.
patent: 5111311 (1992-05-01), Yamamoto
patent: 5267053 (1993-11-01), Potucek et al.
patent: 5296944 (1994-03-01), Suzuki et al.

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