发明名称 |
Method for determining document background for adjusting the dynamic range of an image of the document |
摘要 |
The background grey-level of a document is determined based on the gain of the document. A histogram is generated and compressed. The standard deviation of the distribution curve of the compressed histogram is determined. A gain factor is determined using the mean and standard deviation. Using the background grey-level, the dynamic range of the document is adjusted. |
申请公布号 |
US6198845(B1) |
申请公布日期 |
2001.03.06 |
申请号 |
US19970886205 |
申请日期 |
1997.07.01 |
申请人 |
XEROX CORPORATION |
发明人 |
TSE FRANCIS K.;FARRELL BARBARA L.;NAGARAJAN RAMESH;BLAAKMAN ANDRE M.;FOX RICHARD S.;LAHUE GEORGE W.;YEH THOMAS I. |
分类号 |
G06T1/00;G06T5/40;H04N1/407;(IPC1-7):G06K9/00;G06K9/40;G09G5/10;H04N1/40 |
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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