Conversion of an analog image signal into a binary image signal
US4496987A · kind A · utility
12Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1981 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Oct 2, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image signal processing system for converting an analog image signal into a digital or binary image signal, capable of representing half-tone or gray scale when the corresponding visual image is reproduced by a dot-matrix type printer, is provided. The present system includes storing means for storing at least an array of thresholds, at least one of the thresholds being different in level from the other to form an array pattern. Such a threshold array is used as a reference level in producing a binary image signal. Half-tone is represented by the degree of black dot density per unit area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.