Method for examining doubtful zones on the surface of an unwinding strip by image segmentation
US6778694B1 · kind B1 · utility
22Cited by
2References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/8903
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for examining the surface of an unwinding strip to detect a surface fault. The method includes forming at least a digital image of the strip having a set of image elements each with an assigned digital value. The digital image is filtered to detect surface defects. The filter digital image is processed to identify the type of surface fault in the strip. Before the digital image processing step, the digital image is segmented into doubtful zones each containing a surface defect with the image processing step being carried out on the doubtful zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.