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1. 发明授权

US06967605B2 Image reading apparatus and method of determining gain value and offset value for image reading apparatus 有权
标题翻译：用于图像读取装置的图像读取装置和确定增益值和偏移值的方法
公开(公告)号：US06967605B2
公开(公告)日：2005-11-22
申请号：US10901330
申请日：2004-07-29
申请人： Hideya Fujihara , Hikaru Ootsuka
发明人： Hideya Fujihara , Hikaru Ootsuka
IPC分类号： H03M1/10 , H03M1/12 , H04N1/407 , H03M1/00
CPC分类号： H04N1/4076 , H03M1/1028 , H03M1/12
摘要： An image reading apparatus includes a light source for irradiating an original; a photoelectric converter for converting light reflected from the original to an analog signal; an A/D converter for converting the analog signal corresponding to each pixel from the photoelectric converter to the digital signal; and an adjusting device connected between the photoelectric converter and the A/D converter for performing an offset processing and a gain processing of the analog signal from the photoelectric converter. A memory stores a relational formula representing a correlation between an offset value for the offset processing and a gain value for the gain processing. An offset value calculating device obtains an offset value corresponding to a gain value used in the gain processing of the analog signal by using the gain value and the relational formula stored in the memory.
摘要翻译：图像读取装置包括用于照射原稿的光源; 用于将从原件反射的光转换为模拟信号的光电转换器; A / D转换器，用于将对应于每个像素的模拟信号从光电转换器转换成数字信号; 以及连接在光电转换器和A / D转换器之间的调节装置，用于执行来自光电转换器的模拟信号的偏移处理和增益处理。存储器存储表示偏移处理的偏移值和增益处理的增益值之间的相关性的关系式。偏移值计算装置通过使用存储在存储器中的增益值和关系式获得与模拟信号的增益处理中使用的增益值相对应的偏移值。

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