Method for maintaining uniformity among color measuring instruments
US6559944B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/524
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for maintaining substantial reliability of color measurements obtained by a number of color measuring instruments includes by measuring color values of a set of master color standards on a master color measuring instrument at a master color lab, and measuring color values of sets of working color standards on the same instrument to determine calibration values. The working sets are provided to remote locations for use on remote color measuring instruments and the working sets are measured on the remote color measuring instruments to obtain color value measurements which are transmitted to the master color lab. The measurements from the remote instruments are compared with the calibration values obtained from measurements on the master instrument to generate profiles which are provided to the remote color labs. The profiles are applied to measured color values for the set of working color standards to obtain corrected color values. These values are transmitted to the master color lab and analyzed to determine compliance with specifications as to permissible deviations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.