Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
1998-08-21
2001-07-10
Lee, John R. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S559070, C356S429000
Reexamination Certificate
active
06259109
ABSTRACT:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
Moving webs of material such as films, paper, metals and textiles are extremely difficult to inspect with the naked eye. Typically the web of material is moving at a rate which is too fast for a human to efficiently and accurately analyze or inspect. The entire web of material must be inspected for faults or features since faults or features may occur at any location along the web. Faults or features include holes, spots, dirt, streaks, dents (three dimensional defects), coating and formation problems some of which may be as small as twenty five microns in size. Prior web inspection systems saved single images of web defects in a memory, but were not capable of recording the web continuously. It would be desirable to have a web inspection system which records continuous sequences of the web such that the web may be inspected interactively or at a later time. Additionally, when the web is viewed at a later time, it may be viewed at a slower rate, thus making the inspection of the web easier.
BRIEF SUMMARY OF THE INVENTION
A web inspection system for analysis of a moving web of material records and stores continuous sequences of the web. The web inspection system includes a camera for recording the continuous sequence of the web, an encoder for synchronizing movements of the web with the video image being recorded, and an Image Processing System (IPS) including a real time video disk for storing the image of the web and for displaying the continuous sequence web image on a video display. The IPS is also utilized for detecting faults or features and for categorizing the faults or features detected. The entire web is recorded and the image can be viewed either interactively while the image is being recorded or at a later time. The recorded image of the web can be played back at a slower speed to allow for easier inspection of the web. The sequence image can be analyzed to build a defect/feature image database. The web inspection system can also be utilized for sorting and displaying defect information.
REFERENCES:
patent: 4417149 (1983-11-01), Takeuchi et al.
patent: 4824209 (1989-04-01), Bolton et al.
patent: 5440648 (1995-08-01), Roberts et al.
patent: 5870203 (1999-02-01), Chiu et al.
patent: 5945988 (1999-08-01), Williams et al.
Dalmia Arun
O'Neill Conor
Simmons David M.
Wilson Anthony W.
Datacube Inc.
Lee John R.
Pyo Kevin
Weingarten, Schurgin Gagnebin & Hayes LLP
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