Method and apparatus for the representation of gray scale values

Details Method and apparatus for the representation of gray scale values Method and apparatus for the representation of gray scale values

1981-07-09

1983-10-25

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, 358298, H04M 140

Patent

active

044122560

ABSTRACT:
A method and apparatus for representing gray scale values in facsimile transmission wherein the gray scale values are produced by a number of dots of equal size per unit area on a recording medium prints the dots in consecutive lines which are displaced by constant distances in order to avoid the generation of dashes running perpendicular to the advancing direction of the printing head. The displacement of the consecutive lines is achieved by the addition of different size constant values to the sums of instantaneous values of the gray scale value signals which correspond to the printed gray scale values. The sums corresponding to different lines thus attain a threshold value at different points in time and a dot is printed upon each attainment of the threshold value. The sums are simultaneously decreased by the threshold value. Whenever a black gray scale value occurs, the sum is completely erased.

REFERENCES:
patent: 3965290 (1976-07-01), Tisue

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