Coding and decoding method and system for variable-length sequen

Details Coding and decoding method and system for variable-length sequen Coding and decoding method and system for variable-length sequen

1983-12-09

1986-02-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, H04N 712

Patent

active

045730741

ABSTRACT:
Television signals generated at a transmitting station are digitized and are then transformed into bit groups by a precoder reducing their information content by eliminating redundancies, as by comparing each pixel of a given frame with the homologous pixel of the immediately preceding frame and, upon detecting their equality, emitting a particular reduction code in lieu of an otherwise emitted luminance signal. A message encoder following the precoder generates outgoing data words which may comprise a luminance value accompanied by an integrity code, a changeover signal accompanied by a reduction code, a numerical value specifying the number of consecutive pixels remaining unchanged from the preceding frame, or a synchronizing code. The bits of the outgoing data words are serialized and are temporarily stored in a buffer register in order to be sent at regular intervals, via a communication channel, to a receiving station where a message decoder regroups them in their original order. The decoder separates the luminance data from the reduction codes under the control of a local clock, re-expands the reduced information and, after checking for transmission errors, converts the received data into luminosity signals designed to reproduce the original television picture.

REFERENCES:
patent: 4117517 (1978-09-01), Shintani et al.
patent: 4276544 (1981-06-01), Iinuma
patent: 4398217 (1983-08-01), Peters
Article "Elaboratore in Tempo Reale Per La Riduzione Di Ridondanza Del Segnale Video Standard CCIR", by S. Brofferio et al., published Elettronica E Telecomunicazioni, No. 5, 1978.
"Image Coding by Linear Transformation . . . ", by Ali Habibi et al., IEEE Transactions and Communications Technology, vol. Com. 19, No. 1, Feb. 71.
"Encoding of a Counting Rate Source with Orthogonal Functions", by Algazi et al., Symposium on Computer Processing, Apr. 8-9, 1969, IEEE Transactions on Communications, Jul. 1975, pp. 785, 786.
"Hadamard Transform Image Coding", by W. K. Pratt et al., Proceedings of the IEEE, vol. 57, No. Jan. 1969.
"Adaptive Transform Image for Human Analysis", by Mitchell et al., Published in CH1435-7/79/0000-0119900.75/1979, IEEE.
"Adaptive Coding of Monochrome and Color Images", by Wen-Hsiung Chen et al., IEEE Transactions and Communications, vol. Com 25, No. 11, Nov. 1977.

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