Method and apparatus for the identification of metal surface finishes
US5010578A · kind A · utility
14Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1989 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Jul 17, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/303
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The apparatus includes a specialized scanning system for sampling the metal includes an annular light source for omindirectionally illuminating the surface, a light regulator, and a matrix camera for forming a grey level image of the surface. The image is histogramed according to grey level. The first four statistical moments are calculated from the histogram. The moments are then used as a feature vector to identify the metal surface. If no match is found within the catalogued metal surfaces, allowing for predetermined tolerances for each moment, then the feature vector is catalogued for future recognition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.