Halftone correction systems
US5854882A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1995 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Nov 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6033
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Halftone correction systems are provided for producing dot overlap corrected halftone images at a digital printer. In the first embodiment, a system is provided for halftone correction on a black-and-white digital printer. The system first calibrates the black-and-white digital printer with seven test patterns to provide halftone correction information. Multi-level digital image signals representing a continuous-tone image are then received and stored. The system next halftones these multi-level digital image signals to provide an overlap corrected halftone image responsive to the halftone correction information at the digital printer. Halftoning is performed using an overlap corrected ordered dithering screen, which was generated based upon the correction of the partial overlap of adjacent dots in an uncorrected ordered dithering screen. In the second embodiment, a system is provided for producing dot overlap corrected color halftone images on a digital color printer. The system first calibrates the digital color printer with a set of color test patterns to provide halftone correction information. Next, multi-level digital color image signals representing a continuous-tone color i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.