Web inspection system and method therefor
US4173441A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1977 |
| Grant date | Nov 6, 1979 |
| Priority date | — |
| Expiry date | Mar 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/8915
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An inspection system for web materials, including electronic means responsive to means scanning the web for detecting a plurality of nonuniform appearance features of the web; means for discriminating these appearance features as to class to identify the significant electrical signal components thereof; means for electrically dividing the web into overlapping areas; means for counting the number of occurrences of the significant signal components over a series of scans within each of the overlapping areas; means for comparing each count with predetermined values to electrically define nonuniform appearance features according to area; and means for combining these nonuniform appearance features to recognize the occurrence of a visual defect class as it occurs within each overlapping area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.