Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Reexamination Certificate
2005-03-15
2005-03-15
Coles, Edward (Department: 2622)
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
C250S208100, C382S312000
Reexamination Certificate
active
06867885
ABSTRACT:
An image reading apparatus includes a photoelectric transducer which reads an image of a document and outputs an analog image signal, an A/D converter which converts the analog signal to a digital image signal, and an offset level detecting circuit which determines an average value of output levels from picture elements in a predetermined range of the photoelectric transducer. Further, there is an offset setting unit which provides an offset in the analog image signal before the A/D conversion on the basis of the average value, a first comparing device which compares the average value to a predetermined target value, and an adjusting device which adjusts a size of the predetermined range of the photoelectric transducer on the basis of the result of the comparison.
REFERENCES:
patent: 4894727 (1990-01-01), Sasaki
patent: 5408335 (1995-04-01), Takahashi et al.
patent: 10193685 (1998-07-01), None
Coles Edward
Gibbs Heather D.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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