Picture transmission system using secondary differential variabl

Details Picture transmission system using secondary differential variabl Picture transmission system using secondary differential variabl

1985-04-24

1987-10-27

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, 375 27, H04N 712, H04B 1406

Patent

active

047033487

ABSTRACT:
A picture transmission system of the present invention is adapted to code picture data by a variable sampling rate coding system to transmit the same. Picture data are stored in a frame memory (16) of a transmission area so that differential values between the same and predictors from a predictive circuit (43) are obtained by a subtracter (41) and compression-coded by a variable sampling rate compression circuit (42) to be transmitted. The compression-coded differential values are expansion-decoded by a variable sampling rate expansion circuit (40) so that original differential values are supplied to an adder (45). The adder (45) adds up the differential values with predictors, to produce predictors for subsequent sampling points. In a receiving area, transmitted codes are expansion-decoded by a variable sampling rate expansion circuit (51), so that the decoded values are added up with predictors from a predictive circuit (53) by an adder (52) to output the original picture data. Preposition prediction and variable sampling rate decoding are thus combined to enable, in the receiving area, automatic correction of compression/expansion errors caused in the transmission area.

REFERENCES:
patent: 4493074 (1985-01-01), Walter et al.
patent: 4498102 (1985-02-01), Richard et al.
Kawade et al, "A Variable Sampling Rate Coding Technique", UDC 621.394: 621.397.2: 654.173, pp. 97-104.

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