Process for improving image quality in picture telegraphy
US4213155A · kind A · utility
4Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | May 4, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/41
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for improving the picture quality during transmission of facsimile signals which have an image signal having a signal of a particular polarity but has an minimum amplitude to represent a first information state such as white and a maximum amplitude to represent a second information state such as black whereby due to changes of information of the signal inverter pulses are obtained for the formation of a signal of changed polarity such that the change in polarity represents an information state and the zero position represents the second information state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.