Method for elimination of effects of imperfections on color measurements
US6178254A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1998 |
| Grant date | Jan 23, 2001 |
| Priority date | — |
| Expiry date | May 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30144
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for monitoring the color quality of color patches printed on a web is disclosed. The method includes the steps of using an imaging device to receive light reflected from the printed image on the substrate to produce a signal. The signal is transmitted from the imaging device to a computer and processed in the computer. Processing the signal in the computer includes the steps of digitizing the signal to produce a digitized array of pixels, each pixel having an associated color value, determining a portion of the pixels within the digitized array corresponding to the color patch, determining an acceptable range of color values for the pixels in the portion of the pixels, determining for each pixel in the portion of pixels whether the color value is within the acceptable range, and computing an aggregate color value for the color patch by averaging the color values of each pixel in the portion of pixels including only those color values within the acceptable range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.