Digitizing CCD array system
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United States of America Patent
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Sep 21, 1999
Issued Date -
N/A
app pub date -
Jul 23, 1997
filing date -
Dec 8, 1995
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Expired
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Abstract
A digitizing CCD array system calibrates the CCD array precisely, masks a data medium automatically, and recovers data from the data medium accurately. The system uses a substantially opaque film mask to eliminate the effects of diffused light and flare during a digitization process when the data medium is smaller than an illumination source. A multiple optical density filters are used in calibrating the CCD array to provide a precise optical density reference for digitization of the data medium. In addition, the invention increases contrast sensitivity in data recovery by selectively switching the CCD array on and off to control the duration of multiple exposure times, i.e., integration periods, during a single line scan.
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