Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-01-31
1985-09-17
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358133, 382 56, H04N 100, H04N 712
Patent
active
045424110
ABSTRACT:
A redundancy reduction coding method of a multi-tone picture element comprises the steps of selecting reference picture elements from picture elements already scanned and transmitted, selecting a single reference picture element as a base reference element and then evaluating a plurality of first tone level differences between the base reference picture element and the reference picture elements other than the base reference picture element and a second tone level difference between the base reference picture element and an objective picture element to be transmitted. Then, if and when all of the tone level differences are within a predetermined region, the second tone level difference is converted into a predictive order in which a second tone level difference appears for a particular combination of the plurality of first tone level differences, the predictive order being produced in advance based on statistics of a standard picture. Thereafter, the predictive order is converted into a predetermined assigned code. The code is a variable length code in which a shorter code is assigned to a higher rank of the predictive order.
REFERENCES:
patent: 4133006 (1979-01-01), Iinuma
patent: 4190861 (1980-02-01), Lux
patent: 4325085 (1982-04-01), Gooch
Imanaka Yoshifumi
Ueno Yutaka
Britton Howard W.
Mitsubishi Denki & Kabushiki Kaisha
Peng John K.
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