发明名称 |
Automatic document image revision |
摘要 |
A system for electronically storing revisions or modifications to documents which are already electronically stored in unrevised or unmodified form. The system compares, at the pixel-by-pixel level, a modified document bit map with a stored document bit map and determines from the differences between the two bit maps, at the pixel-by-pixel level, which differences are significant and which are insignificant. A revised document bit map is then formed from the portions of the stored-document bit map exhibiting no significant bit map differences and the significant differences bit map. The result is a revised document bit map in which no unnecessary changes have been introduced into the initial stored-document bit map. The system also includes steps for defining, on a pixel-by-pixel basis, a significant region bit map from the significant difference bit map and for forming the revised document bit map using the significant region bit map.
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申请公布号 |
US4827330(A) |
申请公布日期 |
1989.05.02 |
申请号 |
US19870075798 |
申请日期 |
1987.07.20 |
申请人 |
LITTON INDUSTRIAL AUTOMATION SYSTEMS, INC. |
发明人 |
WALSH, JOHN M.;OTT, DAVID M. |
分类号 |
H04N1/40;(IPC1-7):H04N1/40 |
主分类号 |
H04N1/40 |
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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