Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1997-10-14
1999-10-19
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
356239, G01N 2188
Patent
active
059693720
ABSTRACT:
A method and apparatus for detecting surface defects and artifacts on a transmissive image in an optical image scanner and correcting the resulting scanned image. In one scan, the image is scanned normally. Surface defects and artifacts such as dust, scratches and finger prints are detected by providing a separate scan using infrared light or by measuring light (white or infrared) that is scattered or diffracted by the defects and artifacts. Separate optical paths for illumination may be used, or separate optical paths for intensity measurement may be used. Image processing may then be used to correct areas in the normal scan corresponding to defects identified in the separate scan.
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"Automated Digital Visual Inspection With Dark-Field Microscopy", by Jorge L.C. Sanz, Fritz Merkle and Kwan Y. Wong. 1985 Optical Society Of America, Nov. 1985, vol. 2, No. 11.
"Designing A Scanner With Color Vision", by K. Douglas Gennetten and Michael J. Steinle. Aug. 1993 Hewlett-Packard Journal.
Battles Amy E.
Bloom Daniel M.
Campbell David K.
Herrera E. Oscar R.
Stavely Donald J.
Allen Stephone
Hewlett--Packard Company
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