Method of and means for printing a multilevel representation of

Details Method of and means for printing a multilevel representation of Method of and means for printing a multilevel representation of

1989-03-06

1990-03-27

Walberg, Teresa J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358457, 358459, 358460, 358 78, H04N 123, H04N 146

Patent

active

049125621

ABSTRACT:
A half-tone reproduction of an object on a recording medium is produced using gray level values contained in the cells of an object matrix representative of the object. An actuatable marking device is operatively associated with and displaceable relative to the recording medium for printing a dot thereon at an exposure point determined by the location of the marking device at which the latter is actuated. A representation of the coordinates of the marking device is obtained, and converted to modular coordinates representative of the coordinates of the exposure point on a mesh of a fictitious of half-tone screen having a predetermined angular orientation relative to the print medium. A threshold screen value is computed from the modular coordinates, and a gray level value is obtained from the cell of the object matrix closest to the coordinates of the exposure point. The threshold value is compared to the obtained gray level value, and an actuating signal is produced depending upon the results of the comparison.

REFERENCES:
patent: 4149194 (1979-04-01), Holladay
patent: 4185304 (1980-01-01), Holladay
patent: 4456924 (1984-06-01), Rosenfeld
patent: 4499489 (1985-02-01), Gall et al.
patent: 4700235 (1987-10-01), Gall

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