Redundancy reduction coding method of multi-tone picture signal

Details Redundancy reduction coding method of multi-tone picture signal Redundancy reduction coding method of multi-tone picture signal

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

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