Image analysis – Histogram processing – For setting a threshold
Patent
1993-01-11
1994-04-19
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 34, G06K 900
Patent
active
053053923
ABSTRACT:
A modular system and method using the system for the high speed high resolution inspection of printed webs are provided. Each module inspects one lane of a printed web for print defects. Each gray scale or bipolar gray scale gradient pixel value of a digitally converted input image is compared to the minimum and maximum threshold values of the image template by a real-time digital signal processor. The image template is created in a secondary non-real-time processor by producing a statistical representation of a number of input images. The image template is desensitized to longitudinal and transverse jitter of the printed web so that jitter is not identified by the system as a print defect. The user is signaled if actual print defects exist and the lanes in which the defects exist are identified.
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Longest, Jr. H. Cary
Moffitt Robert H.
Sweeney W. Randolph
Boudreau Leo H.
Glenn Charles E. B.
Osborne Kevin B.
Philip Morris Incorporated
Schardt James E.
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