Rendering of continuous tone images by reducing clustering of halftone dots
US6376138B1 · kind B1 · utility
2Cited by
1References
2Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 9, 1998 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Oct 9, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/26
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Growth and clustering of halftone dots is a drawback in the reproduction of halftoned continuous tone images on prior art recording materials. Certain thermographic materials show a local microdot shrink effect called negative cross-talk upon neighboring microdots when exposing a microdot. Exposing these materials according to the frequency modulated halftone data of an image results in better tone rendering and lower noise due to lower dot clustering or negative cross-talk characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.