Selective enhancement of black
US6799912B2 · kind B2 · utility
0Cited by
5References
41Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2002 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Apr 17, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0158
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A printing technique wherein pixel locations that are requested to be marked with only black are identified, black is applied to the identified pixel locations, and non-black color is applied to those identified pixel locations that (A) have an associated black half-tone threshold level that is darker than a predetermined non-white threshold level, and (B) correspond to on-pixels of a reference pattern of non-black color pixels having an on-pixel population of at least 20 percent and a toner transfer efficiency of less than about 20 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.