发明名称 |
Negative/positive microfilm discriminating system |
摘要 |
A negative-positive microfilm discriminating system for use in a microfilm reader/printer apparatus, comprising a reflector mirror for projecting a beam of light bearing an image detected from a microfilm strip, a sensor disposed in the path of light from the reflector mirror for detecting the densities in each of a plurality of blocks of a patterned image zone of the microfilm strip, and a control circuit for selecting out of the blocks the blocks having acceptable degrees of contrast, determining whether the image zone within each of the selected blocks is a negative or is a positive and determining whether the micrifilm strip is a negative or is a positive.
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申请公布号 |
US4885605(A) |
申请公布日期 |
1989.12.05 |
申请号 |
US19890331059 |
申请日期 |
1989.03.28 |
申请人 |
MINOLTA CAMERA KABUSHIKI KAISHA |
发明人 |
FUJITA, MASAFUMI;YAMADE, YASUSHI;SAIJO, TAKAO |
分类号 |
G03B21/11;G03B27/72;G03G15/00;G03G15/22 |
主分类号 |
G03B21/11 |
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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