Apparatus and method for producing a half-tone image
US6285464A · kind A · utility
12Cited by
17References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1992 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Oct 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4053
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A half-tone image is produced by scanning a plurality of input points of an original, outputting a screened image having a plurality of black and white dots and transmitting signals representing the screened image to a marking device. The size of each plurality of dots is determined from a recursive relationship between a value of a current input point, a previous output and an error representing a difference between a value of a previous input point and the previous output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.