Digital facsimile communication system capable of representing tone differences
US4504115A · kind A · utility
5Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1982 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Jan 21, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital communication system capable of representing tone differences is provided. In the present system, the threshold level used as a reference in converting an analog image signal into a binary image signal is varied, preferably, from scanning line to scanning line at the transmitter side. Then, at the receiver side, exchanging or rearranging of the binary image data between different scanning lines in the same address is carried out. By so doing, data compression technique may be advantageously applied at all times to maintain a high transmission rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.