Method of preparing threshold matrix and method of and apparatus

Details Method of preparing threshold matrix and method of and apparatus Method of preparing threshold matrix and method of and apparatus

1995-12-18

1997-11-11

Hilten, John S.

Typewriting machines

Typing by other than type-face or type-die

Thermal

347183, B41J 2315

Patent

active

056856520

ABSTRACT:
The present invention is made to effectively prevents the occurrence of undesirable dot patterns in the process of FM screening. Threshold values in an M1.times.M2 threshold matrix are determined using a plurality of fundamental tiles of 2.times.2 dots in size. The method of the invention arranges the plurality of fundamental tiles in the M1.times.M2 threshold matrix region, while not allowing the fundamental tiles to have preset forbidden arrangements. This gives a 50% dot pattern including 50% black dots and 50% white dots. The values `0` and `1` are assigned as the upper-most paired bits of digital data representing a threshold value to the positions of two black dots in each fundamental tile, and the values `2` and `3` are assigned as the upper-most paired bits to the positions of two white dots. The values of the other paired bits included in the digital data representing a threshold value are determined by successively dividing the M1.times.M2 threshold matrix region into four equal parts and allocating different values of `0` through `3` to the four divisional matrix regions.

REFERENCES:
patent: 4890121 (1989-12-01), Hirahara et al.
patent: 5099259 (1992-03-01), Hirahara et al.
patent: 5494361 (1996-02-01), Sonoda

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