Process of compressing a succession of digital data and device f

Details Process of compressing a succession of digital data and device f Process of compressing a succession of digital data and device f

1984-11-14

1987-02-24

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358260, 375 28, 375122, 382 56, H04N 712, H04N 140, H04N 1417

Patent

active

046461485

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.

REFERENCES:
patent: 3560639 (1973-03-01), Centanni
patent: 3723879 (1971-02-01), Kaul et al.
patent: 4097903 (1978-06-01), Nakagome et al.
patent: 4115815 (1978-09-01), Nakagome et al.
patent: 4117517 (1978-09-01), Shintani et al.
patent: 4307420 (1981-12-01), Ninomiya et al.
patent: 4325085 (1982-04-01), Gooch
Nachrichtentechnische Zeitschrift, vol. 27, No. 3, Mars 1974, pp. 115-117, Berlin (DE); G. Bestelmann: "A Simple High Quality DPCM-Codec . . . ".

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