Halftone dot-generator and generating method

Details Halftone dot-generator and generating method Halftone dot-generator and generating method

1988-05-18

1989-04-25

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, 358 75, 358 78, H04N 123

Patent

active

048252980

ABSTRACT:
A film coordinate generator generates film coordinates (u, v), corresponding to the position of an exposure beam on a recording film which is detected by encorders, which is in turn supplied to a screen coodinate generator to be converted into virtual screen coordinates (x, y). A beam control signal generator receives the coordinates (x, y) and an image signal corresponding to the position of the exposure beam to output a beam control signal indicating lighting of the exposure beam when one of the coordinates (x, y) is in between upper and lower limit values, corresponding to the same, which are previously decided for each combination of the other of the coordinates (x, y) and the density value of the image signal.

REFERENCES:
patent: 4456924 (1984-06-01), Rosenfeld
patent: 4499489 (1985-02-01), Gall
patent: 4543613 (1985-09-01), Sakamoto
patent: 4547814 (1985-10-01), Hirosawa
patent: 4673971 (1987-06-01), Ikuta

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