Method for color control in the production process
US5809165A · kind A · utility
Inventor
Key dates
| Filing date | Sep 27, 1995 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Sep 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/466
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The colour control of products is carried out with colour sensitive image-forming sensors such as colour matrix, colour line or colour point scanners by calculating from the signals supplied by these sensors one or several multidimensional histograms of the colour vector components both for a reference and for the samples and deriving colour deviation or coincidence measures from the comparison of said histograms. Non-valid spots corresponding to shining spots, shadow areas or uncertain colour values are automatically eliminated before the comparison. This colour control can thus be used even for objects whose surface is not diffuse and is disturbed by other image contents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.