Variable density under/overprinting maps for improving print quality
US7046389B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2001 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Sep 12, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/2139
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A swath printing system and under/overprinting method compensate for the effects of defective printing elements by adjusting the under/overprinting map used during printing regions of a uniform color, typically black, to minimize the adverse impact on print quality of unprinted “white space” caused by the defective printing elements. A printing element quality detector determines which printing elements are functional and which are defective. Based on this information, a print controller then selects or constructs an under/overprinting map having under/overprinting pixel positions chosen to reduce these adverse effects on print quality caused by the defective printing elements, thus maintaining high image quality for the printed output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.