Invention Grant
US07869086B2 Offset adjusting device, correcting device, and method of adjusting analog image signal
有权
偏移调整装置,校正装置以及调整模拟图像信号的方法
- Patent Title: Offset adjusting device, correcting device, and method of adjusting analog image signal
- Patent Title (中): 偏移调整装置,校正装置以及调整模拟图像信号的方法
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Application No.: US11633023Application Date: 2006-12-04
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Publication No.: US07869086B2Publication Date: 2011-01-11
- Inventor: Yoshihisa Soeda
- Applicant: Yoshihisa Soeda
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Limited
- Current Assignee: Ricoh Company, Limited
- Current Assignee Address: JP Tokyo
- Agency: Harness, Dickey & Pierce, P.L.C.
- Priority: JP2005-350470 20051205
- Main IPC: G06F15/00
- IPC: G06F15/00 ; G06K9/72

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.
Public/Granted literature
- US20070127046A1 Offset adjusting device, correcting device, and method of adjusting analog image signal Public/Granted day:2007-06-07
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