Television – Special applications – Manufacturing
Patent
1994-05-31
1996-12-03
Gregory, Bernarr E.
Television
Special applications
Manufacturing
348 86, 348 92, 348241, 348250, H04N 718
Patent
active
H00016160
ABSTRACT:
A web inspection system that inspects a moving web for defects has an enhanced video signal preprocessing capability. The enhanced video signal preprocessing is provided by a preprocessing circuit which has a maximum signal-to-noise (S/N) ratio that is no greater than an inherent maximum S/N ratio of a raw video signal as generated by a charge-coupled device CCD camera. The preprocessing circuit is preferably DC-coupled to the CCD camera to receive the raw video signal and generate an analog filtered video signal using an adaptive feedback loop that preserves a fidelity of the raw video signal in generating the filtered video signal. By improving the video signal preprocessing, the overall defect detection consistency of the web inspection system is improved.
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Gregory Bernarr E.
Griswold Gary L.
Kirn Walter N.
Levine Charles D.
Minnesota Mining and Manufacturing Company
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