G - Physics – 06 – T
Patent
G - Physics
06
T
350/33, 379/4
G06T 9/00 (2006.01) H04N 7/34 (2006.01)
Patent
CA 1253958
ABSTRACT OF THE DISCLOSURE A picture transmission system 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 of a transmission area so that differential values between the same and predictors from a predictive circuit are obtained by a subtracter and compression-coded by a variable sampling rate compression circuit to be transmitted. The compression-coded differential values are expansion-decoded by a variable sampling rate expansion circuit so that original differential values are supplied to an adder. The adder 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, so that the decoded values are added up with predictors from a predictive circuit by an adder to output the original picture date. 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.
479755
Omura Koichi
Yuasa Hiroyoshi
G. Ronald Bell & Associates
Matsushita Electric Works Ltd.
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