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Sequential detection of web defects

United States Patent

6,266,437
July 24, 2001
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A system for detecting defects on a moving web having a sequential series of identical frames uses an imaging device to form a real-time camera image of a frame and a comparitor to comparing elements of the camera image with corresponding elements of an image of an exemplar frame. The comparitor provides an acceptable indication if the pair of elements are determined to be statistically identical; and a defective indication if the pair of elements are determined to be statistically not identical. If the pair of elements is neither acceptable nor defective, the comparitor recursively compares the element of said exemplar frame with corresponding elements of other frames on said web until one of the acceptable or defective indications occur.
Eichel; Paul H. (Albuquerque, NM), Sleefe; Gerard E. (Cedar Crest, NM), Stalker; K. Terry (Albuquerque, NM), Yee; Amy A. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
09/ 148,391
September 4, 1998
The United States Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.