Run length encoding and decoding process and apparatus
US4207599A · kind A · utility
20Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Apr 25, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/419
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Binary data is generated by a facsimile scanner or the like. A binary run length code indicating a number of successive "1" or "0" bits in the data is formed. A shift code comprising all "0" or "1" bits in a number equal to the number of the run length code is appended to the run length code only when the run length code is longer than a preceding run length code. A shorter run length code is indicated by inserting logical "0" bits in vacant high order places of the run length code so as to make the run length code equal in length to the previous run length code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.