发明申请
US20110235112A1 IMAGE SCANNING DEVICE, IMAGE FORMING APPARATUS, AND IMAGE SCANNING METHOD
有权
图像扫描装置，图像形成装置和图像扫描方法
- 专利标题： IMAGE SCANNING DEVICE, IMAGE FORMING APPARATUS, AND IMAGE SCANNING METHOD
- 专利标题（中）： 图像扫描装置，图像形成装置和图像扫描方法
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申请号： US13052260申请日： 2011-03-21
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公开(公告)号： US20110235112A1公开(公告)日： 2011-09-29
- 发明人: Kenta Yamaguchi
- 申请人： Kenta Yamaguchi
- 申请人地址： JP Tokyo
- 专利权人： RICOH COMPANY, LTD.
- 当前专利权人： RICOH COMPANY, LTD.
- 当前专利权人地址： JP Tokyo
- 优先权： JP2010-073814 20100326
- 主分类号： H04N1/04
- IPC分类号： H04N1/04 ; G06F15/00
摘要：
An image scanning device includes an image sensor obtaining an analog image signal; a variable gain amplifier amplifying the analog image signal; an analog-to-digital converter converting the amplified analog image signal into digital image data; a highest value detection unit detecting the highest value in the digital image data; and an amplifier gain setting unit setting an amplifier gain of the variable gain amplifier. The amplifier gain setting unit initially sets the amplifier gain of the variable gain amplifier such that the highest value in first digital image data of a reference image falls within a predetermined range, and if the highest value in second digital image data of the reference image obtained with the initially-set amplifier gain exceeds the predetermined range, the amplifier gain setting unit decreases the amplifier gain of the variable gain amplifier.
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