Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-10-07
1989-06-27
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, 358136, 375 27, H04N 712
Patent
active
048434655
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.
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Kawade et al, "A Variable Sampling Rate Coding Technique", UDC 621.394: 621.397.2: 654.173, pp. 97-104.
Omura Koichi
Yuasa Hiroyoshi
Groody James J.
Matsushita Electric & Works Ltd.
Peng John K.
Seeber Joseph G.
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