发明名称 |
Method of obtaining white reference data used for correcting non-uniformity in photoelectric cell array. |
摘要 |
<p>In an image scan reader, a white reference plate (3) is attached to a transparent plate on which an original is to be placed. Respective optical densities on a plurality of scanning lines (LA1-LAn, LB1-LBm) are detected, and are averaged within respective regions (RA, RB). The maximum values of the respective averaged densities are selected for each pixel to be used for correcting non-uniformity of CCD cells which is employed in reading the white reference plate and the image of the original.</p> |
申请公布号 |
EP0336410(A2) |
申请公布日期 |
1989.10.11 |
申请号 |
EP19890106044 |
申请日期 |
1989.04.06 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
MURAKAMI, SHIGEO DAINIPPON SCREEN MFG.CO., LTD. |
分类号 |
G06T1/00;H04N1/401 |
主分类号 |
G06T1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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