Method for improving printer uniformity
US6554388B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Oct 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4078
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improvement for non-uniformity correction in a printing apparatus (10) wherein an image forming assembly (22) forms an image using a plurality of exposure elements, and the amount of exposure energy at each individual exposure element is capable of being varied. A test print (50) is generated, having a series of test patches or zones with predetermined density levels. A scanner (40) scans the test print (50) to obtain density value readings within each test density zone (52) for each pixel that corresponds to each exposure element. Density value readings are averaged. Then, difference in measurement from this average is used to compute a correction factor for each individual exposure element. An image data manager (12) conditions the input data by this correction factor, then sends the conditioned image data to the image forming assembly (22) for printing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.