Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2011-01-11
2011-01-11
Haskins, Twyler L (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S443000, C358S446000, C358S451000, C358S529000, C348S229100, C348S230100, C348S294000
Reexamination Certificate
active
07869086
ABSTRACT:
An offset adjusting device includes a sample-hold unit that sample-holds an analog image signal obtained by converting reflected light from an original into an electric signal with a photoelectric conversion device to thereby obtain a sample-hold signal; an amplifying unit that amplifies the sample-hold signal to obtain an amplified signal; an analog-digital converter that digitizes the amplified signal to obtain a digital signal; a difference detecting unit that detects a difference between a black-level detection value of the digital signal and a black-level target value; an selecting unit that selects an adjustment coefficient among a plurality of adjustment coefficients based on comparison of the difference and a reference value; and a feedback unit that subjects an offset adjustment value based on the adjustment coefficient selected by the selecting unit to feedback processing.
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Dicker Dennis
Harness & Dickey & Pierce P.L.C.
Haskins Twyler L
Ricoh Company Limited
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