Arrangement for storing or transmitting and for recovering pictu

Details Arrangement for storing or transmitting and for recovering pictu Arrangement for storing or transmitting and for recovering pictu

1982-09-22

1984-07-31

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340347DD, 358260, 358280, 360 91, 364727, H04N 712

Patent

active

044633777

ABSTRACT:
In the conventional transformation coding of pictures the value ranges of the coefficients then produced are extended during the performance of the individual arithmetical steps. As a result thereof these coefficients have a great redundancy. According to the invention, the arithmetical steps which are formed by the basic transformation of two values are performed so that as a result of each arithmetical step only the original word length is obtained, because in each arithmetical step a portion of the value range of the result is mapped onto a different area. An example for the technical implementation of such a mapping on modified coefficients and the retransformation of these modified coefficients is described.

REFERENCES:
patent: 3775602 (1973-11-01), Alexandridis
patent: 3956619 (1976-05-01), Mundy
patent: 4054909 (1977-10-01), Kojima
patent: 4055756 (1977-10-01), Jolivet
patent: 4134134 (1979-01-01), Lux
patent: 4261043 (1981-04-01), Robinson

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