Image processing device for converting a scanned image into a monochrome image
US5377015A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1991 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Sep 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4051
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing device for converting a scanned image into a monochrome image includes a scanner for providing an image signal which is applied to a sampling and holding circuit. The output of the scanning and holding circuit is supplied to a peak hold circuit and to a comparator. The output of the peak hold circuit is also applied to the comparator and the output of the comparator is supplied to a D-type flip flop circuit, the output of which is fed back to the input to the comparator from the scanning and holding circuit. The D-type flip flop generates an alteration of black and white level signals when the output from the sampling and holding circuit is close to the threshold level whereby a printer will print alterations of black and white dots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.