公开(公告)号：US20020159100A1

公开(公告)日：2002-10-31

申请号：US10122656

申请日：2002-04-15

申请人： Konica Corporation

发明人： Ryuji Okutomi ,  Hiroyuki Futami ,  Jun Nakagawa ,  Tadayuki Ueda ,  Eiji Nishikawa

IPC分类号： H04N001/40 ,  H04N001/04

CPC分类号： H04N1/1013 ,  H04N1/12 ,  H04N1/401

摘要： In a document reading apparatus having a scanning exposure reading system by which a document placed on a platen is scanning exposed by an optical system and a document image is read out, or a document reading system by which a moving document is read out by an optical system, at the first collection position and the second collection position which are different in the sub-scanning direction of the scanning expose on a reference density plate, the first shading correction data and the second shading correction data are respectively read in the main scanning direction, and the shading position is corrected on the basis of the read first and second shading correction data.

摘要翻译： 在具有扫描曝光读取系统的文件读取装置中，通过该扫描曝光读取系统，放置在压板上的文件通过光学系统扫描曝光并读出文档图像，或者通过光学读出移动文档的文档读取系统 系统，在基准浓度板上的扫描曝光的副扫描方向上不同的第一收集位置和第二收集位置，分别在主扫描方向上读取第一阴影校正数据和第二阴影校正数据 并且基于读取的第一和第二阴影校正数据来校正阴影位置。