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公开(公告)号：CA1000408A
公开(公告)日：1976-11-23
申请号：CA160703
申请日：1973-01-04
Applicant: IBM
Inventor： BJERKE BRIAN K , SIVERLING MICHAEL M
Abstract: An illumination provides incident radiation to a document lying in an object plane. A photodetector converts nonspecular reflections from the plane into an electrical signal. To prevent unwanted specular reflections, from plastic mail-piece windows or uneven documents, for degrading the signal-to-noise ratio, an optical diffuser is located adjacent the object plane. Both the incident and the reflected radiation pass through the diffuser, which may be a ground-glass flat.
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