Process of compressing a succession of digital data and device for carrying out the same
US4646148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Nov 14, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/42
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention is related to the compression of digitized data to load a buffer memory with a view to the transfer of data towards a mass storage. The invention consists especially in transmitting the difference D.sub.n between two consecutive pixels X.sub.n-1 and X.sub.n instead of these latter, this difference being the most often codable on a small number of bits and in suppressing the sign bit whenever possible, i.e. each time that the indetermination on the sign is raised by the comparison between D.sub.n and X.sub.n-1. The process and device according to the invention are adapted to be applied, in particular, to the storage of images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.