Banding reduction in incremental printing, through use of complementary weights for complementary printhead regions
US6312098A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2000 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Mar 1, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/107
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A structure of bands is associated with printhead-array image-forming elements, forming a printmask. Some band pairs are complementary. A low usage percent is stated for at least one band and a like value for another, a complement to each "at least one" band, to smooth the mask and image. The invention best sets a number N of passes, a wavenumber multiplier M for the image, and overall number B of bands N.times.M.times.2, the "2" accounting for odd and even elements; bands appear in order: PA1 first group of M bands, odd and even, PA1 second group of M bands, odd and even, PA1 . . . PA1 (N-1)th group of M bands, odd and even, PA1 Nth group of M bands, odd and even. In another novel aspect the invention has programming for creating a geometrical structure of bands, respectively associated with the image-forming elements and constituting the printmask. The invention also has programming for specifying a relatively low usage percentage for at least one particular band that is associated with image-forming elements that are not at either of the ends of the array; and programming for applying the printmask in said printing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.