Coding method and apparatus

Details Coding method and apparatus Coding method and apparatus

1986-10-28

1988-11-29

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 358282, 358283, 382 56, H04N 140

Patent

active

047885980

ABSTRACT:
A coding method includes the steps of dividing an image into a plurality of blocks each consisting of a plurality of picture elements, dividing gray scale information of each intrablock picture element into three components, i.e, (1) a reference level representing a position of a signal level of an intrablock picture element in a whole dynamic range of gray scale representation, (2) a level difference representing a distribution range of the signal levels of the intrablock picture elements, and (3) a level designating signal representing a level of each intrablock picture element within the distribution range, and independently coding the three components.

REFERENCES:
patent: 4525747 (1985-06-01), Sakai et al.
patent: 4554593 (1986-11-01), Fox et al.
patent: 4577235 (1986-03-01), Kammapell et al.
patent: 4578715 (1986-03-01), Yamaguchi
patent: 4644410 (1987-02-01), Schlichtig

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